{"id":90809,"date":"2026-08-06T03:40:35","date_gmt":"2026-08-05T19:40:35","guid":{"rendered":"https:\/\/www.wsisp.com\/helps\/90809.html"},"modified":"2026-08-06T03:40:35","modified_gmt":"2026-08-05T19:40:35","slug":"%e4%b8%87%e5%ad%97%e4%b9%a6%e7%b1%8d%e9%80%9f%e9%80%9a%e4%b9%8b%e3%80%8ajava%e8%ae%be%e8%ae%a1%e6%a8%a1%e5%bc%8f%e3%80%8b","status":"publish","type":"post","link":"https:\/\/www.wsisp.com\/helps\/90809.html","title":{"rendered":"\u4e07\u5b57\u4e66\u7c4d\u901f\u901a\u4e4b\u300aJava\u8bbe\u8ba1\u6a21\u5f0f\u300b"},"content":{"rendered":"<h2>\u4e07\u5b57\u4e66\u7c4d\u901f\u901a\u4e4b\u300aJava\u8bbe\u8ba1\u6a21\u5f0f\u300b<\/h2>\n<p><img decoding=\"async\" src=\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2026\/08\/20260805194033-6a7391b1d0b46.png\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\" \/><\/p>\n<p>&#x1f4d6; \u9605\u8bfb\u63d0\u793a&#xff1a;\u672c\u6587\u662f\u5bf9\u300aJava\u8bbe\u8ba1\u6a21\u5f0f\u300b&#xff08;\u5218\u4f1f \u8457&#xff09;\u4e00\u4e66\u7684\u4e07\u5b57\u7cbe\u534e\u901f\u901a&#xff0c;\u6db5\u76d6 4\u5927\u677f\u5757\u300126\u79cd\u7ecf\u5178\u8bbe\u8ba1\u6a21\u5f0f\u30017\u5927\u8bbe\u8ba1\u539f\u5219\u3002\u5168\u6587\u7ea615000\u5b57&#xff0c;\u5efa\u8bae\u9605\u8bfb\u65f6\u95f440\u5206\u949f\u3002\u65e0\u8bba\u4f60\u662f\u521d\u5b66\u8bbe\u8ba1\u6a21\u5f0f\u7684\u65b0\u624b&#xff0c;\u8fd8\u662f\u9700\u8981\u7cfb\u7edf\u590d\u4e60\u7684\u8001\u624b&#xff0c;\u8fd9\u7bc7\u6587\u7ae0\u90fd\u80fd\u5e2e\u4f60\u5feb\u901f\u5efa\u7acb\u5b8c\u6574\u7684\u77e5\u8bc6\u4f53\u7cfb\u3002<\/p>\n<p>&#x1f3f7;\ufe0f \u6807\u7b7e&#xff1a;Java \u8bbe\u8ba1\u6a21\u5f0f GoF \u9762\u5411\u5bf9\u8c61 \u67b6\u6784\u8bbe\u8ba1 \u9762\u8bd5<\/p>\n<hr \/>\n<h3>&#x1f4d1; \u76ee\u5f55<\/h3>\n<ul>\n<li>\u7b2c\u4e00\u90e8\u5206&#xff1a;\u8bbe\u8ba1\u6a21\u5f0f\u57fa\u7840<\/li>\n<li>\u7b2c\u4e8c\u90e8\u5206&#xff1a;\u521b\u5efa\u578b\u8bbe\u8ba1\u6a21\u5f0f<\/li>\n<li>\u7b2c\u4e09\u90e8\u5206&#xff1a;\u7ed3\u6784\u578b\u8bbe\u8ba1\u6a21\u5f0f<\/li>\n<li>\u7b2c\u56db\u90e8\u5206&#xff1a;\u884c\u4e3a\u578b\u8bbe\u8ba1\u6a21\u5f0f<\/li>\n<li>\u9644\u5f55&#xff1a;UML\u7c7b\u56fe<\/li>\n<li>\u5168\u6587\u603b\u7ed3<\/li>\n<\/ul>\n<hr \/>\n<h3>\u7b2c\u4e00\u90e8\u5206&#xff1a;\u8bbe\u8ba1\u6a21\u5f0f\u57fa\u7840<\/h3>\n<h4>\u7b2c1\u7ae0 \u8bbe\u8ba1\u6a21\u5f0f\u6982\u8ff0<\/h4>\n<h5>1.1 \u8bbe\u8ba1\u6a21\u5f0f\u7684\u8bde\u751f\u4e0e\u53d1\u5c55<\/h5>\n<p>\u6a21\u5f0f\u7684\u8bde\u751f<\/p>\n<p>\u201c\u6a21\u5f0f\u201d&#xff08;Pattern&#xff09;\u7684\u6982\u5ff5\u6700\u65e9\u7531\u5efa\u7b51\u5927\u5e08 Christopher Alexander \u57281977\u5e74\u7684\u8457\u4f5c\u300aA Pattern Language\u300b\u4e2d\u63d0\u51fa&#xff1a;<\/p>\n<p>\u201c\u6bcf\u4e2a\u6a21\u5f0f\u90fd\u63cf\u8ff0\u4e86\u4e00\u4e2a\u5728\u6211\u4eec\u7684\u73af\u5883\u4e2d\u4e0d\u65ad\u51fa\u73b0\u7684\u95ee\u9898&#xff0c;\u7136\u540e\u63cf\u8ff0\u4e86\u8be5\u95ee\u9898\u7684\u89e3\u51b3\u65b9\u6848\u7684\u6838\u5fc3\u3002\u201d<\/p>\n<p>\u8fd9\u4e00\u601d\u60f3\u540e\u6765\u88ab\u5f15\u5165\u8f6f\u4ef6\u5de5\u7a0b\u9886\u57df&#xff0c;\u5f7b\u5e95\u6539\u53d8\u4e86\u8f6f\u4ef6\u5f00\u53d1\u7684\u65b9\u5f0f\u3002<\/p>\n<p>\u8f6f\u4ef6\u6a21\u5f0f\u6982\u8ff0<\/p>\n<p>\u8f6f\u4ef6\u6a21\u5f0f\u6309\u62bd\u8c61\u5c42\u6b21\u53ef\u5206\u4e3a\u4e09\u7ea7&#xff1a;<\/p>\n<table>\n<tr>\u5c42\u6b21\u540d\u79f0\u8bf4\u660e<\/tr>\n<tbody>\n<tr>\n<td align=\"center\">\u9ad8<\/td>\n<td align=\"center\">\u67b6\u6784\u6a21\u5f0f<\/td>\n<td align=\"left\">\u7cfb\u7edf\u7ea7\u522b\u7684\u7ec4\u7ec7\u7b56\u7565&#xff08;\u5982MVC\u3001\u5fae\u670d\u52a1&#xff09;<\/td>\n<\/tr>\n<tr>\n<td align=\"center\">\u4e2d<\/td>\n<td align=\"center\">\u8bbe\u8ba1\u6a21\u5f0f<\/td>\n<td align=\"left\">\u7c7b\u4e0e\u5bf9\u8c61\u7ea7\u522b\u7684\u901a\u7528\u89e3\u51b3\u65b9\u6848<\/td>\n<\/tr>\n<tr>\n<td align=\"center\">\u4f4e<\/td>\n<td align=\"center\">\u60ef\u7528\u6cd5&#xff08;Idiom&#xff09;<\/td>\n<td align=\"left\">\u7279\u5b9a\u8bed\u8a00\u7684\u7f16\u7a0b\u6280\u5de7<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>\u8bbe\u8ba1\u6a21\u5f0f\u7684\u53d1\u5c55<\/p>\n<p>1995\u5e74&#xff0c;Erich Gamma\u3001Richard Helm\u3001Ralph Johnson\u3001John Vlissides \u56db\u4eba&#xff08;\u88ab\u5c0a\u79f0\u4e3a \u201cGoF\u201d&#xff0c;Gang of Four&#xff09;\u51fa\u7248\u4e86\u5212\u65f6\u4ee3\u8457\u4f5c\u300aDesign Patterns: Elements of Reusable Object-Oriented Software\u300b&#xff0c;\u7cfb\u7edf\u5316\u5730\u63d0\u51fa\u4e86 23\u79cd\u7ecf\u5178\u8bbe\u8ba1\u6a21\u5f0f&#xff0c;\u5960\u5b9a\u4e86\u73b0\u4ee3\u8f6f\u4ef6\u8bbe\u8ba1\u7684\u57fa\u77f3\u3002<\/p>\n<h5>1.2 \u8bbe\u8ba1\u6a21\u5f0f\u7684\u5b9a\u4e49\u4e0e\u5206\u7c7b<\/h5>\n<p>\u8bbe\u8ba1\u6a21\u5f0f\u7684\u57fa\u672c\u8981\u7d20<\/p>\n<p>\u6bcf\u4e2a\u8bbe\u8ba1\u6a21\u5f0f\u901a\u5e38\u5305\u542b\u56db\u4e2a\u6838\u5fc3\u8981\u7d20&#xff1a;<\/p>\n<table>\n<tr>\u8981\u7d20\u8bf4\u660e<\/tr>\n<tbody>\n<tr>\n<td align=\"center\">\u6a21\u5f0f\u540d\u79f0<\/td>\n<td align=\"left\">\u7528\u4e00\u4e24\u4e2a\u8bcd\u63cf\u8ff0\u6a21\u5f0f\u7684\u95ee\u9898\u3001\u89e3\u51b3\u65b9\u6848\u548c\u6548\u679c<\/td>\n<\/tr>\n<tr>\n<td align=\"center\">\u95ee\u9898<\/td>\n<td align=\"left\">\u63cf\u8ff0\u5e94\u8be5\u5728\u4f55\u65f6\u4f7f\u7528\u8be5\u6a21\u5f0f<\/td>\n<\/tr>\n<tr>\n<td align=\"center\">\u89e3\u51b3\u65b9\u6848<\/td>\n<td align=\"left\">\u63cf\u8ff0\u8bbe\u8ba1\u7684\u7ec4\u6210\u6210\u5206\u53ca\u5b83\u4eec\u4e4b\u95f4\u7684\u5173\u7cfb<\/td>\n<\/tr>\n<tr>\n<td align=\"center\">\u6548\u679c<\/td>\n<td align=\"left\">\u63cf\u8ff0\u6a21\u5f0f\u5e94\u7528\u7684\u6548\u679c\u53ca\u5e94\u6743\u8861\u7684\u95ee\u9898<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>\u8bbe\u8ba1\u6a21\u5f0f\u7684\u4e09\u5927\u5206\u7c7b<\/p>\n<p>\u8bbe\u8ba1\u6a21\u5f0f<br \/>\n\u251c\u2500\u2500 \u521b\u5efa\u578b\u6a21\u5f0f&#xff08;Creational&#xff09;\u2500\u2500 5\u79cd \u2500\u2500 \u5173\u6ce8&#034;\u600e\u4e48\u521b\u5efa\u5bf9\u8c61&#034;<br \/>\n\u251c\u2500\u2500 \u7ed3\u6784\u578b\u6a21\u5f0f&#xff08;Structural&#xff09;\u2500\u2500 7\u79cd \u2500\u2500 \u5173\u6ce8&#034;\u600e\u4e48\u7ec4\u5408\u7c7b\/\u5bf9\u8c61&#034;<br \/>\n\u2514\u2500\u2500 \u884c\u4e3a\u578b\u6a21\u5f0f&#xff08;Behavioral&#xff09;\u2500\u2500 11\u79cd \u2500\u2500 \u5173\u6ce8&#034;\u5bf9\u8c61\u95f4\u600e\u4e48\u901a\u4fe1&#034;<\/p>\n<h5>1.3 GoF\u8bbe\u8ba1\u6a21\u5f0f\u7b80\u4ecb<\/h5>\n<p>GoF 23\u79cd\u8bbe\u8ba1\u6a21\u5f0f\u5168\u666f\u56fe&#xff1a;<\/p>\n<table>\n<tr>\u5206\u7c7b\u6a21\u5f0f\u5217\u8868<\/tr>\n<tbody>\n<tr>\n<td align=\"center\">\u521b\u5efa\u578b<\/td>\n<td align=\"left\">\u5de5\u5382\u65b9\u6cd5\u3001\u62bd\u8c61\u5de5\u5382\u3001\u5efa\u9020\u8005\u3001\u539f\u578b\u3001\u5355\u4f8b<\/td>\n<\/tr>\n<tr>\n<td align=\"center\">\u7ed3\u6784\u578b<\/td>\n<td align=\"left\">\u9002\u914d\u5668\u3001\u6865\u63a5\u3001\u7ec4\u5408\u3001\u88c5\u9970\u3001\u5916\u89c2\u3001\u4eab\u5143\u3001\u4ee3\u7406<\/td>\n<\/tr>\n<tr>\n<td align=\"center\">\u884c\u4e3a\u578b<\/td>\n<td align=\"left\">\u804c\u8d23\u94fe\u3001\u547d\u4ee4\u3001\u89e3\u91ca\u5668\u3001\u8fed\u4ee3\u5668\u3001\u4e2d\u4ecb\u8005\u3001\u5907\u5fd8\u5f55\u3001\u89c2\u5bdf\u8005\u3001\u72b6\u6001\u3001\u7b56\u7565\u3001\u6a21\u677f\u65b9\u6cd5\u3001\u8bbf\u95ee\u8005<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>\u26a0\ufe0f \u6ce8\u610f&#xff1a;\u7b80\u5355\u5de5\u5382\u6a21\u5f0f\u4e0d\u5c5e\u4e8eGoF 23\u79cd&#xff0c;\u4f46\u4f7f\u7528\u6781\u4e3a\u5e7f\u6cdb&#xff0c;\u672c\u4e66\u5c06\u5176\u4f5c\u4e3a\u5de5\u5382\u65b9\u6cd5\u7684\u524d\u7f6e\u77e5\u8bc6\u8bb2\u89e3\u3002<\/p>\n<h5>1.4 \u8bbe\u8ba1\u6a21\u5f0f\u7684\u4f18\u70b9<\/h5>\n<li>\u2705 \u63d0\u9ad8\u4ee3\u7801\u590d\u7528\u6027 \u2014\u2014 \u907f\u514d\u91cd\u590d\u9020\u8f6e\u5b50<\/li>\n<li>\u2705 \u589e\u5f3a\u53ef\u7ef4\u62a4\u6027 \u2014\u2014 \u6807\u51c6\u5316\u65b9\u6848\u964d\u4f4e\u7406\u89e3\u6210\u672c<\/li>\n<li>\u2705 \u63d0\u5347\u53ef\u6269\u5c55\u6027 \u2014\u2014 \u9075\u5faa\u5f00\u95ed\u539f\u5219&#xff0c;\u6613\u4e8e\u6269\u5c55<\/li>\n<li>\u2705 \u4fc3\u8fdb\u56e2\u961f\u6c9f\u901a \u2014\u2014 \u7edf\u4e00\u672f\u8bed&#xff0c;\u964d\u4f4e\u6c9f\u901a\u6210\u672c<\/li>\n<li>\u2705 \u63d0\u9ad8\u8bbe\u8ba1\u8d28\u91cf \u2014\u2014 \u7ecf\u8fc7\u9a8c\u8bc1\u7684\u65b9\u6848&#xff0c;\u51cf\u5c11\u8bbe\u8ba1\u7f3a\u9677<\/li>\n<hr \/>\n<h4>\u7b2c2\u7ae0 \u9762\u5411\u5bf9\u8c61\u8bbe\u8ba1\u539f\u5219<\/h4>\n<h5>2.1 \u9762\u5411\u5bf9\u8c61\u8bbe\u8ba1\u539f\u5219\u6982\u8ff0<\/h5>\n<p>\u8bbe\u8ba1\u539f\u5219\u662f\u8bbe\u8ba1\u6a21\u5f0f\u7684\u7075\u9b42\u4e0e\u57fa\u77f3\u3002\u638c\u63e1\u4e03\u5927\u539f\u5219&#xff08;SOLID &#043; \u5408\u6210\u590d\u7528 &#043; \u8fea\u7c73\u7279&#xff09;&#xff0c;\u662f\u7406\u89e3\u548c\u8fd0\u7528\u8bbe\u8ba1\u6a21\u5f0f\u7684\u524d\u63d0\u3002<\/p>\n<p>SOLID \u539f\u5219<br \/>\n\u251c\u2500\u2500 S \u2500\u2500 \u5355\u4e00\u804c\u8d23\u539f\u5219&#xff08;SRP&#xff09;<br \/>\n\u251c\u2500\u2500 O \u2500\u2500 \u5f00\u95ed\u539f\u5219&#xff08;OCP&#xff09;<br \/>\n\u251c\u2500\u2500 L \u2500\u2500 \u91cc\u6c0f\u4ee3\u6362\u539f\u5219&#xff08;LSP&#xff09;<br \/>\n\u251c\u2500\u2500 I \u2500\u2500 \u63a5\u53e3\u9694\u79bb\u539f\u5219&#xff08;ISP&#xff09;<br \/>\n\u2514\u2500\u2500 D \u2500\u2500 \u4f9d\u8d56\u5012\u8f6c\u539f\u5219&#xff08;DIP&#xff09;<\/p>\n<p>\u8865\u5145\u539f\u5219<br \/>\n\u251c\u2500\u2500 \u5408\u6210\u590d\u7528\u539f\u5219&#xff08;CRP&#xff09;<br \/>\n\u2514\u2500\u2500 \u8fea\u7c73\u7279\u6cd5\u5219&#xff08;LoD&#xff09;<\/p>\n<h5>2.2 \u5355\u4e00\u804c\u8d23\u539f\u5219&#xff08;SRP&#xff09;<\/h5>\n<p>&#x1f3af; \u4e00\u4e2a\u7c7b\u5e94\u8be5\u53ea\u6709\u4e00\u4e2a\u5f15\u8d77\u5b83\u53d8\u5316\u7684\u539f\u56e0\u3002<\/p>\n<p><span class=\"token comment\">\/\/ \u274c \u8fdd\u53cdSRP&#xff1a;\u4e00\u4e2a\u7c7b\u627f\u62c5\u591a\u79cd\u804c\u8d23<\/span><br \/>\n<span class=\"token keyword\">public<\/span> <span class=\"token keyword\">class<\/span> <span class=\"token class-name\">Employee<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">public<\/span> <span class=\"token keyword\">void<\/span> <span class=\"token function\">calculatePay<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span> <span class=\"token comment\">\/* \u8ba1\u7b97\u85aa\u8d44 *\/<\/span> <span class=\"token punctuation\">}<\/span><br \/>\n    <span class=\"token keyword\">public<\/span> <span class=\"token keyword\">void<\/span> <span class=\"token function\">saveToDatabase<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span> <span class=\"token comment\">\/* \u6301\u4e45\u5316 *\/<\/span> <span class=\"token punctuation\">}<\/span><br \/>\n    <span class=\"token keyword\">public<\/span> <span class=\"token keyword\">void<\/span> <span class=\"token function\">generateReport<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span> <span class=\"token comment\">\/* \u751f\u6210\u62a5\u8868 *\/<\/span> <span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p><span class=\"token comment\">\/\/ \u2705 \u9075\u5faaSRP&#xff1a;\u804c\u8d23\u5206\u79bb<\/span><br \/>\n<span class=\"token keyword\">public<\/span> <span class=\"token keyword\">class<\/span> <span class=\"token class-name\">Employee<\/span> <span class=\"token punctuation\">{<\/span> <span class=\"token comment\">\/* \u5458\u5de5\u57fa\u672c\u4fe1\u606f *\/<\/span> <span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token keyword\">public<\/span> <span class=\"token keyword\">class<\/span> <span class=\"token class-name\">PayCalculator<\/span> <span class=\"token punctuation\">{<\/span> <span class=\"token keyword\">public<\/span> <span class=\"token keyword\">void<\/span> <span class=\"token function\">calculate<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">Employee<\/span> e<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span> <span class=\"token punctuation\">}<\/span> <span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token keyword\">public<\/span> <span class=\"token keyword\">class<\/span> <span class=\"token class-name\">EmployeeRepository<\/span> <span class=\"token punctuation\">{<\/span> <span class=\"token keyword\">public<\/span> <span class=\"token keyword\">void<\/span> <span class=\"token function\">save<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">Employee<\/span> e<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span> <span class=\"token punctuation\">}<\/span> <span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token keyword\">public<\/span> <span class=\"token keyword\">class<\/span> <span class=\"token class-name\">ReportGenerator<\/span> <span class=\"token punctuation\">{<\/span> <span class=\"token keyword\">public<\/span> <span class=\"token keyword\">void<\/span> <span class=\"token function\">generate<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">Employee<\/span> e<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span> <span class=\"token punctuation\">}<\/span> <span class=\"token punctuation\">}<\/span><\/p>\n<h5>2.3 \u5f00\u95ed\u539f\u5219&#xff08;OCP&#xff09;<\/h5>\n<p>&#x1f3af; \u8f6f\u4ef6\u5b9e\u4f53\u5e94\u8be5\u5bf9\u6269\u5c55\u5f00\u653e&#xff0c;\u5bf9\u4fee\u6539\u5173\u95ed\u3002<\/p>\n<p>\u8fd9\u662f\u8bbe\u8ba1\u6a21\u5f0f\u4e2d\u6700\u91cd\u8981\u7684\u539f\u5219&#xff0c;\u51e0\u4e4e\u6240\u6709\u6a21\u5f0f\u90fd\u5728\u8df5\u884c\u5b83\u3002<\/p>\n<p><span class=\"token comment\">\/\/ \u2705 \u5bf9\u6269\u5c55\u5f00\u653e&#xff0c;\u5bf9\u4fee\u6539\u5173\u95ed<\/span><br \/>\n<span class=\"token keyword\">public<\/span> <span class=\"token keyword\">interface<\/span> <span class=\"token class-name\">Shape<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">double<\/span> <span class=\"token function\">area<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p><span class=\"token keyword\">public<\/span> <span class=\"token keyword\">class<\/span> <span class=\"token class-name\">Circle<\/span> <span class=\"token keyword\">implements<\/span> <span class=\"token class-name\">Shape<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">private<\/span> <span class=\"token keyword\">double<\/span> r<span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">public<\/span> <span class=\"token keyword\">double<\/span> <span class=\"token function\">area<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span> <span class=\"token keyword\">return<\/span> <span class=\"token class-name\">Math<\/span><span class=\"token punctuation\">.<\/span><span class=\"token constant\">PI<\/span> <span class=\"token operator\">*<\/span> r <span class=\"token operator\">*<\/span> r<span class=\"token punctuation\">;<\/span> <span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p><span class=\"token comment\">\/\/ \u65b0\u589e\u4e09\u89d2\u5f62&#xff0c;\u65e0\u9700\u4fee\u6539\u4efb\u4f55\u5df2\u6709\u4ee3\u7801<\/span><br \/>\n<span class=\"token keyword\">public<\/span> <span class=\"token keyword\">class<\/span> <span class=\"token class-name\">Triangle<\/span> <span class=\"token keyword\">implements<\/span> <span class=\"token class-name\">Shape<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">private<\/span> <span class=\"token keyword\">double<\/span> base<span class=\"token punctuation\">,<\/span> height<span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">public<\/span> <span class=\"token keyword\">double<\/span> <span class=\"token function\">area<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span> <span class=\"token keyword\">return<\/span> <span class=\"token number\">0.5<\/span> <span class=\"token operator\">*<\/span> base <span class=\"token operator\">*<\/span> height<span class=\"token punctuation\">;<\/span> <span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<h5>2.4 \u91cc\u6c0f\u4ee3\u6362\u539f\u5219&#xff08;LSP&#xff09;<\/h5>\n<p>&#x1f3af; \u6240\u6709\u5f15\u7528\u57fa\u7c7b\u7684\u5730\u65b9\u5fc5\u987b\u80fd\u900f\u660e\u5730\u4f7f\u7528\u5176\u5b50\u7c7b\u7684\u5bf9\u8c61\u3002<\/p>\n<p>\u5b50\u7c7b\u53ef\u4ee5\u6269\u5c55\u7236\u7c7b\u7684\u529f\u80fd&#xff0c;\u4f46\u4e0d\u80fd\u6539\u53d8\u7236\u7c7b\u539f\u6709\u7684\u529f\u80fd\u3002<\/p>\n<p>&#x1f4a1; \u7ecf\u5178\u53cd\u4f8b&#xff1a;\u201c\u6b63\u65b9\u5f62\u7ee7\u627f\u957f\u65b9\u5f62\u201d\u2014\u2014\u6b63\u65b9\u5f62\u4fee\u6539\u5bbd\u5ea6\u65f6\u9ad8\u5ea6\u4e5f\u53d8&#xff0c;\u8fdd\u53cd\u4e86\u957f\u65b9\u5f62\u7684\u884c\u4e3a\u5951\u7ea6\u3002<\/p>\n<h5>2.5 \u4f9d\u8d56\u5012\u8f6c\u539f\u5219&#xff08;DIP&#xff09;<\/h5>\n<p>&#x1f3af; \u9ad8\u5c42\u6a21\u5757\u4e0d\u5e94\u8be5\u4f9d\u8d56\u4f4e\u5c42\u6a21\u5757&#xff0c;\u4e24\u8005\u90fd\u5e94\u8be5\u4f9d\u8d56\u5176\u62bd\u8c61\u3002<\/p>\n<p><span class=\"token comment\">\/\/ \u274c \u9ad8\u5c42\u76f4\u63a5\u4f9d\u8d56\u4f4e\u5c42\u5177\u4f53\u7c7b<\/span><br \/>\n<span class=\"token keyword\">public<\/span> <span class=\"token keyword\">class<\/span> <span class=\"token class-name\">Computer<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">private<\/span> <span class=\"token class-name\">KingstonRAM<\/span> ram <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">KingstonRAM<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p><span class=\"token comment\">\/\/ \u2705 \u4f9d\u8d56\u62bd\u8c61\u63a5\u53e3<\/span><br \/>\n<span class=\"token keyword\">public<\/span> <span class=\"token keyword\">class<\/span> <span class=\"token class-name\">Computer<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">private<\/span> <span class=\"token class-name\">RAM<\/span> ram<span class=\"token punctuation\">;<\/span>  <span class=\"token comment\">\/\/ \u4f9d\u8d56\u62bd\u8c61<\/span><br \/>\n    <span class=\"token keyword\">public<\/span> <span class=\"token class-name\">Computer<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">RAM<\/span> ram<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span> <span class=\"token keyword\">this<\/span><span class=\"token punctuation\">.<\/span>ram <span class=\"token operator\">&#061;<\/span> ram<span class=\"token punctuation\">;<\/span> <span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<h5>2.6 \u63a5\u53e3\u9694\u79bb\u539f\u5219&#xff08;ISP&#xff09;<\/h5>\n<p>&#x1f3af; \u5ba2\u6237\u7aef\u4e0d\u5e94\u8be5\u88ab\u8feb\u4f9d\u8d56\u4e8e\u5b83\u4e0d\u4f7f\u7528\u7684\u65b9\u6cd5\u3002<\/p>\n<p>\u5c06\u81c3\u80bf\u63a5\u53e3\u62c6\u5206\u4e3a\u66f4\u5c0f\u3001\u66f4\u5177\u4f53\u7684\u63a5\u53e3&#xff1a;<\/p>\n<p><span class=\"token comment\">\/\/ \u274c \u80d6\u63a5\u53e3<\/span><br \/>\n<span class=\"token keyword\">public<\/span> <span class=\"token keyword\">interface<\/span> <span class=\"token class-name\">Worker<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">void<\/span> <span class=\"token function\">work<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">void<\/span> <span class=\"token function\">eat<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">void<\/span> <span class=\"token function\">sleep<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p><span class=\"token comment\">\/\/ \u2705 \u63a5\u53e3\u9694\u79bb<\/span><br \/>\n<span class=\"token keyword\">public<\/span> <span class=\"token keyword\">interface<\/span> <span class=\"token class-name\">Workable<\/span> <span class=\"token punctuation\">{<\/span> <span class=\"token keyword\">void<\/span> <span class=\"token function\">work<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span> <span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token keyword\">public<\/span> <span class=\"token keyword\">interface<\/span> <span class=\"token class-name\">Eatable<\/span> <span class=\"token punctuation\">{<\/span> <span class=\"token keyword\">void<\/span> <span class=\"token function\">eat<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span> <span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token keyword\">public<\/span> <span class=\"token keyword\">interface<\/span> <span class=\"token class-name\">Sleepable<\/span> <span class=\"token punctuation\">{<\/span> <span class=\"token keyword\">void<\/span> <span class=\"token function\">sleep<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span> <span class=\"token punctuation\">}<\/span><\/p>\n<h5>2.7 \u5408\u6210\u590d\u7528\u539f\u5219&#xff08;CRP&#xff09;<\/h5>\n<p>&#x1f3af; \u4f18\u5148\u4f7f\u7528\u5bf9\u8c61\u7ec4\u5408&#xff08;has-a&#xff09;&#xff0c;\u800c\u975e\u7ee7\u627f&#xff08;is-a&#xff09;\u6765\u8fbe\u5230\u590d\u7528\u76ee\u7684\u3002<\/p>\n<table>\n<tr>\u590d\u7528\u65b9\u5f0f\u4f18\u70b9\u7f3a\u70b9<\/tr>\n<tbody>\n<tr>\n<td align=\"center\">\u7ee7\u627f&#xff08;is-a&#xff09;<\/td>\n<td align=\"left\">\u5b9e\u73b0\u7b80\u5355<\/td>\n<td align=\"left\">\u767d\u7bb1\u590d\u7528&#xff0c;\u66b4\u9732\u7236\u7c7b\u7ec6\u8282&#xff0c;\u8026\u5408\u5ea6\u9ad8<\/td>\n<\/tr>\n<tr>\n<td align=\"center\">\u7ec4\u5408&#xff08;has-a&#xff09;<\/td>\n<td align=\"left\">\u5c01\u88c5\u6027\u597d&#xff0c;\u8fd0\u884c\u65f6\u53ef\u66ff\u6362<\/td>\n<td align=\"left\">\u9700\u8981\u989d\u5916\u7684\u59d4\u6258\u4ee3\u7801<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h5>2.8 \u8fea\u7c73\u7279\u6cd5\u5219&#xff08;LoD&#xff09;<\/h5>\n<p>&#x1f3af; \u4e00\u4e2a\u5bf9\u8c61\u5e94\u8be5\u5bf9\u5176\u4ed6\u5bf9\u8c61\u4fdd\u6301\u6700\u5c11\u7684\u4e86\u89e3&#xff0c;\u53ea\u4e0e&#034;\u76f4\u63a5\u670b\u53cb&#034;\u901a\u4fe1\u3002<\/p>\n<p>\u53c8\u79f0&#034;\u6700\u5c11\u77e5\u8bc6\u539f\u5219&#034;&#xff0c;\u6838\u5fc3\u601d\u60f3\u662f\u964d\u4f4e\u8026\u5408\u3002<\/p>\n<p><span class=\"token comment\">\/\/ \u274c \u964c\u751f\u4eba\u901a\u4fe1<\/span><br \/>\nperson<span class=\"token punctuation\">.<\/span><span class=\"token function\">getWallet<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">getMoney<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">getAmount<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p><span class=\"token comment\">\/\/ \u2705 \u53ea\u4e0e\u76f4\u63a5\u670b\u53cb\u901a\u4fe1<\/span><br \/>\nperson<span class=\"token punctuation\">.<\/span><span class=\"token function\">getBalance<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<hr \/>\n<h3>\u7b2c\u4e8c\u90e8\u5206&#xff1a;\u521b\u5efa\u578b\u8bbe\u8ba1\u6a21\u5f0f<\/h3>\n<p>&#x1f3ed; \u6838\u5fc3\u601d\u60f3&#xff1a;\u5c06\u5bf9\u8c61\u7684\u521b\u5efa\u4e0e\u4f7f\u7528\u5206\u79bb&#xff0c;\u964d\u4f4e\u7cfb\u7edf\u8026\u5408\u5ea6\u3002<\/p>\n<h4>\u7b2c3\u7ae0 \u7b80\u5355\u5de5\u5382\u6a21\u5f0f<\/h4>\n<h5>3.1 \u521b\u5efa\u578b\u6a21\u5f0f\u6982\u8ff0<\/h5>\n<p>\u521b\u5efa\u578b\u6a21\u5f0f\u5173\u6ce8&#034;\u600e\u6837\u521b\u5efa\u5bf9\u8c61&#034;&#xff0c;\u4e3b\u8981\u5305\u62ec&#xff1a;\u7b80\u5355\u5de5\u5382\u3001\u5de5\u5382\u65b9\u6cd5\u3001\u62bd\u8c61\u5de5\u5382\u3001\u5efa\u9020\u8005\u3001\u539f\u578b\u3001\u5355\u4f8b\u3002<\/p>\n<h5>3.2 \u7b80\u5355\u5de5\u5382\u6a21\u5f0f\u6982\u8ff0<\/h5>\n<p>\u7b80\u5355\u5de5\u5382\u6a21\u5f0f&#xff08;Simple Factory Pattern&#xff09;\u53c8\u79f0\u9759\u6001\u5de5\u5382\u65b9\u6cd5\u6a21\u5f0f&#xff0c;\u7531\u4e00\u4e2a\u5de5\u5382\u5bf9\u8c61\u51b3\u5b9a\u521b\u5efa\u51fa\u54ea\u4e00\u79cd\u4ea7\u54c1\u7c7b\u7684\u5b9e\u4f8b\u3002<\/p>\n<p>\u26a0\ufe0f \u5b83\u4e0d\u5c5e\u4e8eGoF 23\u79cd\u6a21\u5f0f&#xff0c;\u4f46\u4f7f\u7528\u6781\u4e3a\u5e7f\u6cdb&#xff0c;\u662f\u5b66\u4e60\u5de5\u5382\u65b9\u6cd5\u7684\u524d\u7f6e\u77e5\u8bc6\u3002<\/p>\n<h5>3.3 \u7b80\u5355\u5de5\u5382\u6a21\u5f0f\u7ed3\u6784\u4e0e\u5b9e\u73b0<\/h5>\n<p>\u89d2\u8272\u7ec4\u6210&#xff1a;<\/p>\n<p>\u250c\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2510<br \/>\n\u2502           SimpleFactory&#xff08;\u5de5\u5382&#xff09;          \u2502<br \/>\n\u2502  &#043; createProduct(type): Product         \u2502<br \/>\n\u2514\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u252c\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2518<br \/>\n                  \u2502 \u521b\u5efa<br \/>\n        \u250c\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2534\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2510<br \/>\n        \u25bc                   \u25bc<br \/>\n\u250c\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2510   \u250c\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2510<br \/>\n\u2502  ProductA    \u2502   \u2502  ProductB    \u2502<br \/>\n\u2514\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2518   \u2514\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2518<br \/>\n        \u25b2                   \u25b2<br \/>\n        \u2514\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u252c\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2518<br \/>\n                  \u2502<br \/>\n        \u250c\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2534\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2510<br \/>\n        \u2502  Product&#xff08;\u62bd\u8c61&#xff09;   \u2502<br \/>\n        \u2502  &#043; use(): void    \u2502<br \/>\n        \u2514\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2518<\/p>\n<p><span class=\"token comment\">\/\/ \u62bd\u8c61\u4ea7\u54c1<\/span><br \/>\n<span class=\"token keyword\">public<\/span> <span class=\"token keyword\">abstract<\/span> <span class=\"token keyword\">class<\/span> <span class=\"token class-name\">Product<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">public<\/span> <span class=\"token keyword\">abstract<\/span> <span class=\"token keyword\">void<\/span> <span class=\"token function\">use<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p><span class=\"token comment\">\/\/ \u5177\u4f53\u4ea7\u54c1<\/span><br \/>\n<span class=\"token keyword\">public<\/span> <span class=\"token keyword\">class<\/span> <span class=\"token class-name\">ProductA<\/span> <span class=\"token keyword\">extends<\/span> <span class=\"token class-name\">Product<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token annotation punctuation\">&#064;Override<\/span><br \/>\n    <span class=\"token keyword\">public<\/span> <span class=\"token keyword\">void<\/span> <span class=\"token function\">use<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span> <span class=\"token class-name\">System<\/span><span class=\"token punctuation\">.<\/span>out<span class=\"token punctuation\">.<\/span><span class=\"token function\">println<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;\u4f7f\u7528\u4ea7\u54c1A&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span> <span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p><span class=\"token keyword\">public<\/span> <span class=\"token keyword\">class<\/span> <span class=\"token class-name\">ProductB<\/span> <span class=\"token keyword\">extends<\/span> <span class=\"token class-name\">Product<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token annotation punctuation\">&#064;Override<\/span><br \/>\n    <span class=\"token keyword\">public<\/span> <span class=\"token keyword\">void<\/span> <span class=\"token function\">use<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span> <span class=\"token class-name\">System<\/span><span class=\"token punctuation\">.<\/span>out<span class=\"token punctuation\">.<\/span><span class=\"token function\">println<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;\u4f7f\u7528\u4ea7\u54c1B&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span> <span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p><span class=\"token comment\">\/\/ \u5de5\u5382\u7c7b<\/span><br \/>\n<span class=\"token keyword\">public<\/span> <span class=\"token keyword\">class<\/span> <span class=\"token class-name\">SimpleFactory<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">public<\/span> <span class=\"token keyword\">static<\/span> <span class=\"token class-name\">Product<\/span> <span class=\"token function\">createProduct<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">String<\/span> type<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token keyword\">switch<\/span> <span class=\"token punctuation\">(<\/span>type<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n            <span class=\"token keyword\">case<\/span> <span class=\"token string\">&#034;A&#034;<\/span><span class=\"token operator\">:<\/span> <span class=\"token keyword\">return<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">ProductA<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token keyword\">case<\/span> <span class=\"token string\">&#034;B&#034;<\/span><span class=\"token operator\">:<\/span> <span class=\"token keyword\">return<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">ProductB<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token keyword\">default<\/span><span class=\"token operator\">:<\/span>  <span class=\"token keyword\">throw<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">IllegalArgumentException<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;\u672a\u77e5\u7c7b\u578b&#xff1a;&#034;<\/span> <span class=\"token operator\">&#043;<\/span> type<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p><span class=\"token comment\">\/\/ \u5ba2\u6237\u7aef<\/span><br \/>\n<span class=\"token keyword\">public<\/span> <span class=\"token keyword\">class<\/span> <span class=\"token class-name\">Client<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">public<\/span> <span class=\"token keyword\">static<\/span> <span class=\"token keyword\">void<\/span> <span class=\"token function\">main<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">String<\/span><span class=\"token punctuation\">[<\/span><span class=\"token punctuation\">]<\/span> args<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token class-name\">Product<\/span> product <span class=\"token operator\">&#061;<\/span> <span class=\"token class-name\">SimpleFactory<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">createProduct<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;A&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        product<span class=\"token punctuation\">.<\/span><span class=\"token function\">use<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>  <span class=\"token comment\">\/\/ \u8f93\u51fa&#xff1a;\u4f7f\u7528\u4ea7\u54c1A<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<h5>3.4 \u7b80\u5355\u5de5\u5382\u6a21\u5f0f\u5e94\u7528\u5b9e\u4f8b<\/h5>\n<p>\u4ee5\u56fe\u8868\u5e93\u4e3a\u4f8b&#xff1a;\u6839\u636e\u7c7b\u578b\u5b57\u7b26\u4e32\u521b\u5efa\u67f1\u72b6\u56fe&#xff08;HistogramChart&#xff09;\u3001\u997c\u56fe&#xff08;PieChart&#xff09;\u3001\u6298\u7ebf\u56fe&#xff08;LineChart&#xff09;\u3002<\/p>\n<h5>3.5 \u5173\u4e8e\u521b\u5efa\u5bf9\u8c61\u4e0e\u4f7f\u7528\u5bf9\u8c61<\/h5>\n<p>\u5c06\u521b\u5efa\u903b\u8f91\u96c6\u4e2d\u5230\u5de5\u5382\u4e2d&#xff0c;\u5ba2\u6237\u7aef\u65e0\u9700\u5173\u5fc3\u5177\u4f53\u7c7b\u7684\u5b9e\u4f8b\u5316\u8fc7\u7a0b&#xff0c;\u5b9e\u73b0\u4e86\u521b\u5efa\u4e0e\u4f7f\u7528\u7684\u5206\u79bb\u3002<\/p>\n<h5>3.6 \u7b80\u5355\u5de5\u5382\u6a21\u5f0f\u7684\u7b80\u5316<\/h5>\n<p>\u53ef\u4ee5\u4f7f\u7528\u53cd\u5c04\u673a\u5236\u7b80\u5316if-else\u5224\u65ad&#xff1a;<\/p>\n<p><span class=\"token keyword\">public<\/span> <span class=\"token keyword\">class<\/span> <span class=\"token class-name\">SimpleFactory<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">public<\/span> <span class=\"token keyword\">static<\/span> <span class=\"token class-name\">Product<\/span> <span class=\"token function\">createProduct<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">String<\/span> className<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token keyword\">try<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n            <span class=\"token keyword\">return<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token class-name\">Product<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token class-name\">Class<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">forName<\/span><span class=\"token punctuation\">(<\/span>className<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">newInstance<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span> <span class=\"token keyword\">catch<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token class-name\">Exception<\/span> e<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n            <span class=\"token keyword\">throw<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">RuntimeException<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;\u521b\u5efa\u5931\u8d25&#034;<\/span><span class=\"token punctuation\">,<\/span> e<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p>\u914d\u5408\u914d\u7f6e\u6587\u4ef6&#xff0c;\u66f4\u6362\u4ea7\u54c1\u65e0\u9700\u4fee\u6539\u4ee3\u7801\u3002<\/p>\n<h5>3.7 \u7b80\u5355\u5de5\u5382\u6a21\u5f0f\u4f18\u7f3a\u70b9\u4e0e\u9002\u7528\u73af\u5883<\/h5>\n<table>\n<tr>\u4f18\u70b9 \u2705\u7f3a\u70b9 \u274c<\/tr>\n<tbody>\n<tr>\n<td align=\"left\">\u5b9e\u73b0\u521b\u5efa\u4e0e\u4f7f\u7528\u5206\u79bb<\/td>\n<td align=\"left\">\u5de5\u5382\u7c7b\u804c\u8d23\u8fc7\u91cd&#xff0c;\u8fdd\u53cdSRP<\/td>\n<\/tr>\n<tr>\n<td align=\"left\">\u5ba2\u6237\u7aef\u65e0\u9700\u77e5\u9053\u5177\u4f53\u7c7b\u540d<\/td>\n<td align=\"left\">\u65b0\u589e\u4ea7\u54c1\u9700\u4fee\u6539\u5de5\u5382\u4ee3\u7801&#xff0c;\u8fdd\u53cdOCP<\/td>\n<\/tr>\n<tr>\n<td align=\"left\">\u901a\u8fc7\u914d\u7f6e\u6587\u4ef6\u63d0\u9ad8\u7075\u6d3b\u6027<\/td>\n<td align=\"left\">\u4f7f\u7528\u9759\u6001\u65b9\u6cd5&#xff0c;\u65e0\u6cd5\u5f62\u6210\u7ee7\u627f\u7ed3\u6784<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>\u9002\u7528\u73af\u5883&#xff1a;\u4ea7\u54c1\u79cd\u7c7b\u8f83\u5c11\u3001\u4e0d\u7ecf\u5e38\u53d8\u5316\u7684\u573a\u666f\u3002<\/p>\n<hr \/>\n<h4>\u7b2c4\u7ae0 \u5de5\u5382\u65b9\u6cd5\u6a21\u5f0f<\/h4>\n<h5>4.1 \u5de5\u5382\u65b9\u6cd5\u6a21\u5f0f\u6982\u8ff0<\/h5>\n<p>\u5de5\u5382\u65b9\u6cd5\u6a21\u5f0f&#xff08;Factory Method Pattern&#xff09;\u5b9a\u4e49\u4e00\u4e2a\u7528\u4e8e\u521b\u5efa\u5bf9\u8c61\u7684\u63a5\u53e3&#xff0c;\u8ba9\u5b50\u7c7b\u51b3\u5b9a\u5c06\u54ea\u4e00\u4e2a\u7c7b\u5b9e\u4f8b\u5316\u3002\u5b83\u662f\u5bf9\u7b80\u5355\u5de5\u5382\u7684\u8fdb\u4e00\u6b65\u62bd\u8c61&#xff0c;\u5b8c\u7f8e\u89e3\u51b3\u4e86OCP\u95ee\u9898\u3002<\/p>\n<h5>4.2 \u5de5\u5382\u65b9\u6cd5\u6a21\u5f0f\u7ed3\u6784\u4e0e\u5b9e\u73b0<\/h5>\n<p><span class=\"token comment\">\/\/ \u62bd\u8c61\u5de5\u5382<\/span><br \/>\n<span class=\"token keyword\">public<\/span> <span class=\"token keyword\">abstract<\/span> <span class=\"token keyword\">class<\/span> <span class=\"token class-name\">Factory<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">public<\/span> <span class=\"token keyword\">abstract<\/span> <span class=\"token class-name\">Product<\/span> <span class=\"token function\">createProduct<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p><span class=\"token comment\">\/\/ \u5177\u4f53\u5de5\u5382A<\/span><br \/>\n<span class=\"token keyword\">public<\/span> <span class=\"token keyword\">class<\/span> <span class=\"token class-name\">ConcreteFactoryA<\/span> <span class=\"token keyword\">extends<\/span> <span class=\"token class-name\">Factory<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token annotation punctuation\">&#064;Override<\/span><br \/>\n    <span class=\"token keyword\">public<\/span> <span class=\"token class-name\">Product<\/span> <span class=\"token function\">createProduct<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span> <span class=\"token keyword\">return<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">ProductA<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span> <span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p><span class=\"token comment\">\/\/ \u5177\u4f53\u5de5\u5382B<\/span><br \/>\n<span class=\"token keyword\">public<\/span> <span class=\"token keyword\">class<\/span> <span class=\"token class-name\">ConcreteFactoryB<\/span> <span class=\"token keyword\">extends<\/span> <span class=\"token class-name\">Factory<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token annotation punctuation\">&#064;Override<\/span><br \/>\n    <span class=\"token keyword\">public<\/span> <span class=\"token class-name\">Product<\/span> <span class=\"token function\">createProduct<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span> <span class=\"token keyword\">return<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">ProductB<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span> <span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p><span class=\"token comment\">\/\/ \u5ba2\u6237\u7aef&#xff1a;\u9762\u5411\u62bd\u8c61\u7f16\u7a0b<\/span><br \/>\n<span class=\"token keyword\">public<\/span> <span class=\"token keyword\">class<\/span> <span class=\"token class-name\">Client<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">public<\/span> <span class=\"token keyword\">static<\/span> <span class=\"token keyword\">void<\/span> <span class=\"token function\">main<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">String<\/span><span class=\"token punctuation\">[<\/span><span class=\"token punctuation\">]<\/span> args<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token class-name\">Factory<\/span> factory <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">ConcreteFactoryA<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>  <span class=\"token comment\">\/\/ \u53ef\u66ff\u6362\u4e3aB<\/span><br \/>\n        <span class=\"token class-name\">Product<\/span> product <span class=\"token operator\">&#061;<\/span> factory<span class=\"token punctuation\">.<\/span><span class=\"token function\">createProduct<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        product<span class=\"token punctuation\">.<\/span><span class=\"token function\">use<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<h5>4.3 \u5de5\u5382\u65b9\u6cd5\u6a21\u5f0f\u5e94\u7528\u5b9e\u4f8b<\/h5>\n<p>\u4ee5\u65e5\u5fd7\u8bb0\u5f55\u5668\u4e3a\u4f8b&#xff1a;<\/p>\n<ul>\n<li>FileLoggerFactory \u2192 \u521b\u5efa\u6587\u4ef6\u65e5\u5fd7\u8bb0\u5f55\u5668<\/li>\n<li>DatabaseLoggerFactory \u2192 \u521b\u5efa\u6570\u636e\u5e93\u65e5\u5fd7\u8bb0\u5f55\u5668<\/li>\n<\/ul>\n<h5>4.4 \u53cd\u5c04\u673a\u5236\u4e0e\u914d\u7f6e\u6587\u4ef6<\/h5>\n<p>\u7ed3\u5408Java\u53cd\u5c04\u548c\u914d\u7f6e\u6587\u4ef6&#xff0c;\u53ef\u4ee5\u5728\u4e0d\u4fee\u6539\u4ee3\u7801\u7684\u60c5\u51b5\u4e0b\u66f4\u6362\u5177\u4f53\u5de5\u5382&#xff1a;<\/p>\n<p># config.properties<br \/>\nfactoryClass&#061;com.example.ConcreteFactoryA<\/p>\n<p><span class=\"token comment\">\/\/ \u8bfb\u53d6\u914d\u7f6e\u5e76\u53cd\u5c04\u521b\u5efa<\/span><br \/>\n<span class=\"token class-name\">Properties<\/span> props <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">Properties<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\nprops<span class=\"token punctuation\">.<\/span><span class=\"token function\">load<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">new<\/span> <span class=\"token class-name\">FileInputStream<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;config.properties&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token class-name\">String<\/span> className <span class=\"token operator\">&#061;<\/span> props<span class=\"token punctuation\">.<\/span><span class=\"token function\">getProperty<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;factoryClass&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token class-name\">Factory<\/span> factory <span class=\"token operator\">&#061;<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token class-name\">Factory<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token class-name\">Class<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">forName<\/span><span class=\"token punctuation\">(<\/span>className<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">getDeclaredConstructor<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">newInstance<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<h5>4.5 \u5de5\u5382\u65b9\u6cd5\u7684\u91cd\u8f7d<\/h5>\n<p>\u5de5\u5382\u65b9\u6cd5\u53ef\u4ee5\u63d0\u4f9b\u591a\u4e2a\u91cd\u8f7d\u7248\u672c&#xff0c;\u652f\u6301\u4e0d\u540c\u53c2\u6570\u7684\u521b\u5efa\u65b9\u5f0f&#xff1a;<\/p>\n<p><span class=\"token keyword\">public<\/span> <span class=\"token keyword\">abstract<\/span> <span class=\"token keyword\">class<\/span> <span class=\"token class-name\">LoggerFactory<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">public<\/span> <span class=\"token keyword\">abstract<\/span> <span class=\"token class-name\">Logger<\/span> <span class=\"token function\">createLogger<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">public<\/span> <span class=\"token class-name\">Logger<\/span> <span class=\"token function\">createLogger<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">String<\/span> name<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span> <span class=\"token comment\">\/* \u5e26\u540d\u79f0 *\/<\/span> <span class=\"token punctuation\">}<\/span><br \/>\n    <span class=\"token keyword\">public<\/span> <span class=\"token class-name\">Logger<\/span> <span class=\"token function\">createLogger<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">Object<\/span> obj<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span> <span class=\"token comment\">\/* \u5e26\u914d\u7f6e\u5bf9\u8c61 *\/<\/span> <span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<h5>4.6 \u5de5\u5382\u65b9\u6cd5\u7684\u9690\u85cf<\/h5>\n<p>\u5c06\u5de5\u5382\u65b9\u6cd5\u8bbe\u4e3aprotected&#xff0c;\u901a\u8fc7\u6a21\u677f\u65b9\u6cd5\u6a21\u5f0f\u5bf9\u5916\u63d0\u4f9b\u7edf\u4e00\u63a5\u53e3\u3002<\/p>\n<h5>4.7 \u5de5\u5382\u65b9\u6cd5\u6a21\u5f0f\u4f18\u7f3a\u70b9\u4e0e\u9002\u7528\u73af\u5883<\/h5>\n<table>\n<tr>\u4f18\u70b9 \u2705\u7f3a\u70b9 \u274c<\/tr>\n<tbody>\n<tr>\n<td align=\"left\">\u7b26\u5408OCP&#xff0c;\u65b0\u589e\u4ea7\u54c1\u65e0\u9700\u4fee\u6539\u5df2\u6709\u4ee3\u7801<\/td>\n<td align=\"left\">\u6bcf\u589e\u52a0\u4e00\u4e2a\u4ea7\u54c1\u5c31\u9700\u589e\u52a0\u4e00\u4e2a\u5de5\u5382\u7c7b<\/td>\n<\/tr>\n<tr>\n<td align=\"left\">\u7b26\u5408SRP&#xff0c;\u6bcf\u4e2a\u5de5\u5382\u53ea\u8d1f\u8d23\u4e00\u79cd\u4ea7\u54c1<\/td>\n<td align=\"left\">\u589e\u52a0\u4e86\u7cfb\u7edf\u62bd\u8c61\u6027\u548c\u7406\u89e3\u96be\u5ea6<\/td>\n<\/tr>\n<tr>\n<td align=\"left\">\u652f\u6301\u591a\u6001&#xff0c;\u5ba2\u6237\u7aef\u9762\u5411\u62bd\u8c61\u7f16\u7a0b<\/td>\n<td align=\"left\">\u53ea\u80fd\u521b\u5efa\u540c\u4e00\u7b49\u7ea7\u7684\u4ea7\u54c1<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<hr \/>\n<h4>\u7b2c5\u7ae0 \u62bd\u8c61\u5de5\u5382\u6a21\u5f0f<\/h4>\n<h5>5.1 \u4ea7\u54c1\u7b49\u7ea7\u7ed3\u6784\u4e0e\u4ea7\u54c1\u65cf<\/h5>\n<p>\u7406\u89e3\u4e24\u4e2a\u6838\u5fc3\u6982\u5ff5&#xff1a;<\/p>\n<p>\u4ea7\u54c1\u7b49\u7ea7\u7ed3\u6784&#xff08;\u7eb5\u5411&#xff09;          \u4ea7\u54c1\u65cf&#xff08;\u6a2a\u5411&#xff09;<\/p>\n<p>  Button&#xff08;\u62bd\u8c61&#xff09;              Mac\u5de5\u5382        Win\u5de5\u5382<br \/>\n   \u251c\u2500\u2500 MacButton              \u250c\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2510    \u250c\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2510<br \/>\n   \u2514\u2500\u2500 WinButton              \u2502MacBtn  \u2502    \u2502WinBtn  \u2502<br \/>\n                              \u2502MacWin  \u2502    \u2502WinWin  \u2502<br \/>\n  Window&#xff08;\u62bd\u8c61&#xff09;              \u2502MacMenu \u2502    \u2502WinMenu \u2502<br \/>\n   \u251c\u2500\u2500 MacWindow              \u2514\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2518    \u2514\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2518<br \/>\n   \u2514\u2500\u2500 WinWindow<\/p>\n<ul>\n<li>\u4ea7\u54c1\u7b49\u7ea7\u7ed3\u6784&#xff1a;\u4ea7\u54c1\u7684\u7ee7\u627f\u7ed3\u6784&#xff08;\u5982 Shape \u2192 Circle, Rectangle&#xff09;<\/li>\n<li>\u4ea7\u54c1\u65cf&#xff1a;\u540c\u4e00\u5de5\u5382\u751f\u4ea7\u7684\u4f4d\u4e8e\u4e0d\u540c\u7b49\u7ea7\u7684\u4e00\u7ec4\u4ea7\u54c1<\/li>\n<\/ul>\n<h5>5.2 \u62bd\u8c61\u5de5\u5382\u6a21\u5f0f\u6982\u8ff0<\/h5>\n<p>\u62bd\u8c61\u5de5\u5382\u6a21\u5f0f&#xff08;Abstract Factory Pattern&#xff09;\u63d0\u4f9b\u4e00\u4e2a\u521b\u5efa\u4e00\u7cfb\u5217\u76f8\u5173\u6216\u76f8\u4e92\u4f9d\u8d56\u5bf9\u8c61\u7684\u63a5\u53e3&#xff0c;\u65e0\u9700\u6307\u5b9a\u5177\u4f53\u7c7b\u3002<\/p>\n<h5>5.3 \u62bd\u8c61\u5de5\u5382\u6a21\u5f0f\u7ed3\u6784\u4e0e\u5b9e\u73b0<\/h5>\n<p><span class=\"token comment\">\/\/ \u62bd\u8c61\u5de5\u5382&#xff1a;\u521b\u5efa\u4e00\u65cf\u4ea7\u54c1<\/span><br \/>\n<span class=\"token keyword\">public<\/span> <span class=\"token keyword\">abstract<\/span> <span class=\"token keyword\">class<\/span> <span class=\"token class-name\">UIFactory<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">public<\/span> <span class=\"token keyword\">abstract<\/span> <span class=\"token class-name\">Button<\/span> <span class=\"token function\">createButton<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">public<\/span> <span class=\"token keyword\">abstract<\/span> <span class=\"token class-name\">Window<\/span> <span class=\"token function\">createWindow<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p><span class=\"token comment\">\/\/ \u5177\u4f53\u5de5\u5382&#xff1a;Mac\u98ce\u683c<\/span><br \/>\n<span class=\"token keyword\">public<\/span> <span class=\"token keyword\">class<\/span> <span class=\"token class-name\">MacFactory<\/span> <span class=\"token keyword\">extends<\/span> <span class=\"token class-name\">UIFactory<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">public<\/span> <span class=\"token class-name\">Button<\/span> <span class=\"token function\">createButton<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span> <span class=\"token keyword\">return<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">MacButton<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span> <span class=\"token punctuation\">}<\/span><br \/>\n    <span class=\"token keyword\">public<\/span> <span class=\"token class-name\">Window<\/span> <span class=\"token function\">createWindow<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span> <span class=\"token keyword\">return<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">MacWindow<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span> <span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p><span class=\"token comment\">\/\/ \u5177\u4f53\u5de5\u5382&#xff1a;Windows\u98ce\u683c<\/span><br \/>\n<span class=\"token keyword\">public<\/span> <span class=\"token keyword\">class<\/span> <span class=\"token class-name\">WinFactory<\/span> <span class=\"token keyword\">extends<\/span> <span class=\"token class-name\">UIFactory<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">public<\/span> <span class=\"token class-name\">Button<\/span> <span class=\"token function\">createButton<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span> <span class=\"token keyword\">return<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">WinButton<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span> <span class=\"token punctuation\">}<\/span><br \/>\n    <span class=\"token keyword\">public<\/span> <span class=\"token class-name\">Window<\/span> <span class=\"token function\">createWindow<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span> <span class=\"token keyword\">return<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">WinWindow<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span> <span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p><span class=\"token comment\">\/\/ \u5ba2\u6237\u7aef<\/span><br \/>\n<span class=\"token keyword\">public<\/span> <span class=\"token keyword\">class<\/span> <span class=\"token class-name\">Client<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">public<\/span> <span class=\"token keyword\">static<\/span> <span class=\"token keyword\">void<\/span> <span class=\"token function\">main<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">String<\/span><span class=\"token punctuation\">[<\/span><span class=\"token punctuation\">]<\/span> args<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token class-name\">UIFactory<\/span> factory <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">MacFactory<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>  <span class=\"token comment\">\/\/ \u5207\u6362\u5de5\u5382\u5373\u53ef\u5207\u6362\u6574\u5957UI<\/span><br \/>\n        <span class=\"token class-name\">Button<\/span> btn <span class=\"token operator\">&#061;<\/span> factory<span class=\"token punctuation\">.<\/span><span class=\"token function\">createButton<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token class-name\">Window<\/span> win <span class=\"token operator\">&#061;<\/span> factory<span class=\"token punctuation\">.<\/span><span class=\"token function\">createWindow<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<h5>5.4 \u62bd\u8c61\u5de5\u5382\u6a21\u5f0f\u5e94\u7528\u5b9e\u4f8b<\/h5>\n<ul>\n<li>\u8de8\u5e73\u53f0UI\u5de5\u5177\u5305&#xff08;Mac\/Windows\/Linux\u98ce\u683c&#xff09;<\/li>\n<li>\u591a\u6570\u636e\u5e93\u8bbf\u95ee\u5c42&#xff08;MySQL\u5de5\u5382\u3001Oracle\u5de5\u5382\u5404\u81ea\u521b\u5efaConnection\u3001Command\u3001DataReader&#xff09;<\/li>\n<\/ul>\n<h5>5.5 \u5f00\u95ed\u539f\u5219\u7684\u503e\u659c\u6027<\/h5>\n<p>\u26a0\ufe0f \u62bd\u8c61\u5de5\u5382\u6a21\u5f0f\u5bf9&#034;\u589e\u52a0\u4ea7\u54c1\u65cf&#034;\u7b26\u5408OCP&#xff0c;\u4f46\u5bf9&#034;\u589e\u52a0\u4ea7\u54c1\u7b49\u7ea7\u7ed3\u6784&#034;\u8fdd\u53cdOCP&#xff08;\u9700\u4fee\u6539\u6240\u6709\u5de5\u5382\u63a5\u53e3\u548c\u5b9e\u73b0&#xff09;\u3002<\/p>\n<p>\u8fd9\u5c31\u662f\u6240\u8c13\u7684 \u201c\u5f00\u95ed\u539f\u5219\u7684\u503e\u659c\u6027\u201d\u3002<\/p>\n<h5>5.6 \u62bd\u8c61\u5de5\u5382\u6a21\u5f0f\u4f18\u7f3a\u70b9\u4e0e\u9002\u7528\u73af\u5883<\/h5>\n<table>\n<tr>\u4f18\u70b9 \u2705\u7f3a\u70b9 \u274c<\/tr>\n<tbody>\n<tr>\n<td align=\"left\">\u4fdd\u8bc1\u540c\u65cf\u4ea7\u54c1\u7684\u4e00\u81f4\u6027<\/td>\n<td align=\"left\">\u589e\u52a0\u65b0\u4ea7\u54c1\u7b49\u7ea7\u7ed3\u6784\u56f0\u96be<\/td>\n<\/tr>\n<tr>\n<td align=\"left\">\u5207\u6362\u4ea7\u54c1\u65cf\u975e\u5e38\u65b9\u4fbf<\/td>\n<td align=\"left\">\u7cfb\u7edf\u6269\u5c55\u6027\u53d7\u9650<\/td>\n<\/tr>\n<tr>\n<td align=\"left\">\u5ba2\u6237\u7aef\u4e0e\u5177\u4f53\u7c7b\u89e3\u8026<\/td>\n<td align=\"left\">\u7c7b\u6570\u91cf\u589e\u957f\u8f83\u5feb<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>\u9002\u7528\u73af\u5883&#xff1a;\u7cfb\u7edf\u4e2d\u6709\u591a\u4e2a\u4ea7\u54c1\u65cf&#xff0c;\u4e14\u6bcf\u6b21\u53ea\u4f7f\u7528\u5176\u4e2d\u4e00\u65cf\u4ea7\u54c1\u3002<\/p>\n<hr \/>\n<h4>\u7b2c6\u7ae0 \u5efa\u9020\u8005\u6a21\u5f0f<\/h4>\n<h5>6.1 \u5efa\u9020\u8005\u6a21\u5f0f\u6982\u8ff0<\/h5>\n<p>\u5efa\u9020\u8005\u6a21\u5f0f&#xff08;Builder Pattern&#xff09;\u5c06\u4e00\u4e2a\u590d\u6742\u5bf9\u8c61\u7684\u6784\u5efa\u4e0e\u5b83\u7684\u8868\u793a\u5206\u79bb&#xff0c;\u4f7f\u5f97\u540c\u6837\u7684\u6784\u5efa\u8fc7\u7a0b\u53ef\u4ee5\u521b\u5efa\u4e0d\u540c\u7684\u8868\u793a\u3002<\/p>\n<p>&#x1f4a1; \u6838\u5fc3\u573a\u666f&#xff1a;\u521b\u5efa\u6b65\u9aa4\u56fa\u5b9a&#xff0c;\u4f46\u5404\u6b65\u9aa4\u7684\u5177\u4f53\u5b9e\u73b0\u4e0d\u540c\u3002<\/p>\n<h5>6.2 \u5efa\u9020\u8005\u6a21\u5f0f\u7ed3\u6784\u4e0e\u5b9e\u73b0<\/h5>\n<p><span class=\"token comment\">\/\/ \u4ea7\u54c1\u7c7b<\/span><br \/>\n<span class=\"token keyword\">public<\/span> <span class=\"token keyword\">class<\/span> <span class=\"token class-name\">Computer<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">private<\/span> <span class=\"token class-name\">String<\/span> cpu<span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">private<\/span> <span class=\"token class-name\">String<\/span> ram<span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">private<\/span> <span class=\"token class-name\">String<\/span> storage<span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token comment\">\/\/ getters &amp; setters &amp; toString<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p><span class=\"token comment\">\/\/ \u62bd\u8c61\u5efa\u9020\u8005<\/span><br \/>\n<span class=\"token keyword\">public<\/span> <span class=\"token keyword\">abstract<\/span> <span class=\"token keyword\">class<\/span> <span class=\"token class-name\">ComputerBuilder<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">protected<\/span> <span class=\"token class-name\">Computer<\/span> computer <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">Computer<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">public<\/span> <span class=\"token keyword\">abstract<\/span> <span class=\"token keyword\">void<\/span> <span class=\"token function\">buildCPU<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">public<\/span> <span class=\"token keyword\">abstract<\/span> <span class=\"token keyword\">void<\/span> <span class=\"token function\">buildRAM<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">public<\/span> <span class=\"token keyword\">abstract<\/span> <span class=\"token keyword\">void<\/span> <span class=\"token function\">buildStorage<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">public<\/span> <span class=\"token class-name\">Computer<\/span> <span class=\"token function\">getResult<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span> <span class=\"token keyword\">return<\/span> computer<span class=\"token punctuation\">;<\/span> <span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p><span class=\"token comment\">\/\/ \u5177\u4f53\u5efa\u9020\u8005<\/span><br \/>\n<span class=\"token keyword\">public<\/span> <span class=\"token keyword\">class<\/span> <span class=\"token class-name\">GamingPCBuilder<\/span> <span class=\"token keyword\">extends<\/span> <span class=\"token class-name\">ComputerBuilder<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">public<\/span> <span class=\"token keyword\">void<\/span> <span class=\"token function\">buildCPU<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span> computer<span class=\"token punctuation\">.<\/span><span class=\"token function\">setCpu<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;Intel i9&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span> <span class=\"token punctuation\">}<\/span><br \/>\n    <span class=\"token keyword\">public<\/span> <span class=\"token keyword\">void<\/span> <span class=\"token function\">buildRAM<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span> computer<span class=\"token punctuation\">.<\/span><span class=\"token function\">setRam<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;64GB DDR5&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span> <span class=\"token punctuation\">}<\/span><br \/>\n    <span class=\"token keyword\">public<\/span> <span class=\"token keyword\">void<\/span> <span class=\"token function\">buildStorage<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span> computer<span class=\"token punctuation\">.<\/span><span class=\"token function\">setStorage<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;2TB NVMe SSD&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span> <span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p><span class=\"token comment\">\/\/ \u6307\u6325\u8005&#xff1a;\u63a7\u5236\u6784\u5efa\u987a\u5e8f<\/span><br \/>\n<span class=\"token keyword\">public<\/span> <span class=\"token keyword\">class<\/span> <span class=\"token class-name\">Director<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">private<\/span> <span class=\"token class-name\">ComputerBuilder<\/span> builder<span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">public<\/span> <span class=\"token class-name\">Director<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">ComputerBuilder<\/span> builder<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span> <span class=\"token keyword\">this<\/span><span class=\"token punctuation\">.<\/span>builder <span class=\"token operator\">&#061;<\/span> builder<span class=\"token punctuation\">;<\/span> <span class=\"token punctuation\">}<\/span><\/p>\n<p>    <span class=\"token keyword\">public<\/span> <span class=\"token class-name\">Computer<\/span> <span class=\"token function\">construct<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        builder<span class=\"token punctuation\">.<\/span><span class=\"token function\">buildCPU<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        builder<span class=\"token punctuation\">.<\/span><span class=\"token function\">buildRAM<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        builder<span class=\"token punctuation\">.<\/span><span class=\"token function\">buildStorage<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">return<\/span> builder<span class=\"token punctuation\">.<\/span><span class=\"token function\">getResult<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<h5>6.3 \u5efa\u9020\u8005\u6a21\u5f0f\u5e94\u7528\u5b9e\u4f8b<\/h5>\n<ul>\n<li>\u6e38\u620f\u89d2\u8272\u521b\u5efa&#xff08;\u79cd\u65cf\u3001\u804c\u4e1a\u3001\u5916\u89c2\u3001\u6280\u80fd&#xff09;<\/li>\n<li>\u590d\u6742\u6587\u6863\u751f\u6210&#xff08;PDF\u62a5\u544a&#xff09;<\/li>\n<li>SQL\u67e5\u8be2\u6784\u5efa\u5668&#xff08;MyBatis\u7684SqlSessionFactoryBuilder&#xff09;<\/li>\n<\/ul>\n<h5>6.4 \u6307\u6325\u8005\u7c7b\u7684\u6df1\u5165\u8ba8\u8bba<\/h5>\n<p>\u6307\u6325\u8005&#xff08;Director&#xff09;\u63a7\u5236\u6784\u5efa\u987a\u5e8f\u3002\u5728\u5b9e\u9645\u5f00\u53d1\u4e2d&#xff0c;\u6307\u6325\u8005\u5e38\u88ab\u7701\u7565&#xff0c;\u7531\u5ba2\u6237\u7aef\u76f4\u63a5\u63a7\u5236\u6784\u5efa\u8fc7\u7a0b&#xff08;\u5982 Lombok\u7684&#064;Builder\u3001StringBuilder&#xff09;\u3002<\/p>\n<h5>6.5 \u5efa\u9020\u8005\u6a21\u5f0f\u4f18\u7f3a\u70b9\u4e0e\u9002\u7528\u73af\u5883<\/h5>\n<table>\n<tr>\u4f18\u70b9 \u2705\u7f3a\u70b9 \u274c<\/tr>\n<tbody>\n<tr>\n<td align=\"left\">\u6784\u5efa\u4e0e\u8868\u793a\u5206\u79bb<\/td>\n<td align=\"left\">\u4ea7\u54c1\u5dee\u5f02\u5927\u65f6\u590d\u7528\u6027\u5dee<\/td>\n<\/tr>\n<tr>\n<td align=\"left\">\u53ef\u7cbe\u7ec6\u63a7\u5236\u6784\u5efa\u8fc7\u7a0b<\/td>\n<td align=\"left\">\u589e\u52a0\u4e86\u5efa\u9020\u8005\u7c7b\u7684\u6570\u91cf<\/td>\n<\/tr>\n<tr>\n<td align=\"left\">\u6613\u4e8e\u6269\u5c55\u65b0\u5efa\u9020\u8005<\/td>\n<td align=\"left\">\u4e0d\u9002\u5408\u4ea7\u54c1\u53d8\u5316\u9891\u7e41\u7684\u573a\u666f<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>\u9002\u7528\u73af\u5883&#xff1a;\u521b\u5efa\u590d\u6742\u5bf9\u8c61&#xff0c;\u6784\u5efa\u6b65\u9aa4\u56fa\u5b9a\u4f46\u5404\u6b65\u9aa4\u5177\u4f53\u5b9e\u73b0\u53ef\u53d8\u3002<\/p>\n<hr \/>\n<h4>\u7b2c7\u7ae0 \u539f\u578b\u6a21\u5f0f<\/h4>\n<h5>7.1 \u539f\u578b\u6a21\u5f0f\u6982\u8ff0<\/h5>\n<p>\u539f\u578b\u6a21\u5f0f&#xff08;Prototype Pattern&#xff09;\u7528\u539f\u578b\u5b9e\u4f8b\u6307\u5b9a\u521b\u5efa\u5bf9\u8c61\u7684\u79cd\u7c7b&#xff0c;\u5e76\u901a\u8fc7\u62f7\u8d1d\u8fd9\u4e9b\u539f\u578b\u521b\u5efa\u65b0\u7684\u5bf9\u8c61\u3002\u907f\u514d\u4e86\u91cd\u590d\u7684\u521d\u59cb\u5316\u8fc7\u7a0b\u3002<\/p>\n<h5>7.2 \u539f\u578b\u6a21\u5f0f\u7ed3\u6784\u4e0e\u5b9e\u73b0&#xff08;\u6d45\u514b\u9686\u4e0e\u6df1\u514b\u9686&#xff09;<\/h5>\n<p><span class=\"token comment\">\/\/ &#061;&#061;&#061;&#061;&#061;&#061;&#061;&#061;&#061;&#061; \u6d45\u514b\u9686 &#061;&#061;&#061;&#061;&#061;&#061;&#061;&#061;&#061;&#061;<\/span><br \/>\n<span class=\"token keyword\">public<\/span> <span class=\"token keyword\">class<\/span> <span class=\"token class-name\">ShallowClone<\/span> <span class=\"token keyword\">implements<\/span> <span class=\"token class-name\">Cloneable<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">private<\/span> <span class=\"token class-name\">String<\/span> name<span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">private<\/span> <span class=\"token class-name\">List<\/span><span class=\"token generics\"><span class=\"token punctuation\">&lt;<\/span><span class=\"token class-name\">String<\/span><span class=\"token punctuation\">&gt;<\/span><\/span> hobbies<span class=\"token punctuation\">;<\/span>  <span class=\"token comment\">\/\/ \u5f15\u7528\u7c7b\u578b<\/span><\/p>\n<p>    <span class=\"token annotation punctuation\">&#064;Override<\/span><br \/>\n    <span class=\"token keyword\">protected<\/span> <span class=\"token class-name\">Object<\/span> <span class=\"token function\">clone<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token keyword\">throws<\/span> <span class=\"token class-name\">CloneNotSupportedException<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token keyword\">return<\/span> <span class=\"token keyword\">super<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">clone<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>  <span class=\"token comment\">\/\/ \u26a0\ufe0f hobbies\u5f15\u7528\u540c\u4e00\u5bf9\u8c61&#xff01;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p><span class=\"token comment\">\/\/ &#061;&#061;&#061;&#061;&#061;&#061;&#061;&#061;&#061;&#061; \u6df1\u514b\u9686&#xff08;\u5e8f\u5217\u5316\u65b9\u5f0f&#xff09; &#061;&#061;&#061;&#061;&#061;&#061;&#061;&#061;&#061;&#061;<\/span><br \/>\n<span class=\"token keyword\">public<\/span> <span class=\"token keyword\">class<\/span> <span class=\"token class-name\">DeepClone<\/span> <span class=\"token keyword\">implements<\/span> <span class=\"token class-name\">Serializable<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">private<\/span> <span class=\"token class-name\">String<\/span> name<span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">private<\/span> <span class=\"token class-name\">List<\/span><span class=\"token generics\"><span class=\"token punctuation\">&lt;<\/span><span class=\"token class-name\">String<\/span><span class=\"token punctuation\">&gt;<\/span><\/span> hobbies<span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token keyword\">public<\/span> <span class=\"token class-name\">DeepClone<\/span> <span class=\"token function\">deepClone<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token keyword\">try<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n            <span class=\"token class-name\">ByteArrayOutputStream<\/span> bos <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">ByteArrayOutputStream<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token class-name\">ObjectOutputStream<\/span> oos <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">ObjectOutputStream<\/span><span class=\"token punctuation\">(<\/span>bos<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            oos<span class=\"token punctuation\">.<\/span><span class=\"token function\">writeObject<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">this<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>            <span class=\"token class-name\">ByteArrayInputStream<\/span> bis <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">ByteArrayInputStream<\/span><span class=\"token punctuation\">(<\/span>bos<span class=\"token punctuation\">.<\/span><span class=\"token function\">toByteArray<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token class-name\">ObjectInputStream<\/span> ois <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">ObjectInputStream<\/span><span class=\"token punctuation\">(<\/span>bis<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token keyword\">return<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token class-name\">DeepClone<\/span><span class=\"token punctuation\">)<\/span> ois<span class=\"token punctuation\">.<\/span><span class=\"token function\">readObject<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span> <span class=\"token keyword\">catch<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token class-name\">Exception<\/span> e<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n            <span class=\"token keyword\">throw<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">RuntimeException<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;\u6df1\u514b\u9686\u5931\u8d25&#034;<\/span><span class=\"token punctuation\">,<\/span> e<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p>\u26a0\ufe0f \u6d45\u514b\u9686&#xff1a;\u53ea\u590d\u5236\u57fa\u672c\u7c7b\u578b\u5b57\u6bb5&#xff0c;\u5f15\u7528\u7c7b\u578b\u5b57\u6bb5\u5171\u4eab\u540c\u4e00\u5bf9\u8c61\u3002 \u6df1\u514b\u9686&#xff1a;\u9012\u5f52\u590d\u5236\u6240\u6709\u5f15\u7528\u5bf9\u8c61&#xff0c;\u5b8c\u5168\u72ec\u7acb\u3002<\/p>\n<h5>7.3 \u539f\u578b\u6a21\u5f0f\u5e94\u7528\u5b9e\u4f8b<\/h5>\n<ul>\n<li>\u90ae\u4ef6\u7fa4\u53d1\u65f6\u590d\u5236\u90ae\u4ef6\u5bf9\u8c61&#xff08;\u53ea\u6539\u6536\u4ef6\u4eba&#xff09;<\/li>\n<li>\u68cb\u76d8\u72b6\u6001\u5feb\u7167&#xff08;\u4fdd\u5b58\/\u6062\u590d&#xff09;<\/li>\n<li>\u5bf9\u8c61\u6c60\u4e2d\u7684\u5bf9\u8c61\u590d\u7528<\/li>\n<\/ul>\n<h5>7.4 \u539f\u578b\u7ba1\u7406\u5668<\/h5>\n<p>\u539f\u578b\u7ba1\u7406\u5668&#xff08;Prototype Manager&#xff09;\u7ef4\u62a4\u4e00\u4e2a\u539f\u578b\u6ce8\u518c\u8868&#xff0c;\u5ba2\u6237\u7aef\u901a\u8fc7\u952e\u503c\u83b7\u53d6\u514b\u9686\u5bf9\u8c61&#xff1a;<\/p>\n<p><span class=\"token keyword\">public<\/span> <span class=\"token keyword\">class<\/span> <span class=\"token class-name\">PrototypeManager<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">private<\/span> <span class=\"token keyword\">static<\/span> <span class=\"token class-name\">Map<\/span><span class=\"token generics\"><span class=\"token punctuation\">&lt;<\/span><span class=\"token class-name\">String<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token class-name\">Prototype<\/span><span class=\"token punctuation\">&gt;<\/span><\/span> registry <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">HashMap<\/span><span class=\"token generics\"><span class=\"token punctuation\">&lt;<\/span><span class=\"token punctuation\">&gt;<\/span><\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token keyword\">public<\/span> <span class=\"token keyword\">static<\/span> <span class=\"token keyword\">void<\/span> <span class=\"token function\">register<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">String<\/span> key<span class=\"token punctuation\">,<\/span> <span class=\"token class-name\">Prototype<\/span> proto<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        registry<span class=\"token punctuation\">.<\/span><span class=\"token function\">put<\/span><span class=\"token punctuation\">(<\/span>key<span class=\"token punctuation\">,<\/span> proto<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><\/p>\n<p>    <span class=\"token keyword\">public<\/span> <span class=\"token keyword\">static<\/span> <span class=\"token class-name\">Prototype<\/span> <span class=\"token function\">getClone<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">String<\/span> key<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token keyword\">return<\/span> registry<span class=\"token punctuation\">.<\/span><span class=\"token function\">get<\/span><span class=\"token punctuation\">(<\/span>key<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">clone<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<h5>7.5 \u539f\u578b\u6a21\u5f0f\u4f18\u7f3a\u70b9\u4e0e\u9002\u7528\u73af\u5883<\/h5>\n<table>\n<tr>\u4f18\u70b9 \u2705\u7f3a\u70b9 \u274c<\/tr>\n<tbody>\n<tr>\n<td align=\"left\">\u907f\u514d\u91cd\u590d\u521d\u59cb\u5316&#xff0c;\u6027\u80fd\u66f4\u4f18<\/td>\n<td align=\"left\">\u6df1\u514b\u9686\u5b9e\u73b0\u590d\u6742<\/td>\n<\/tr>\n<tr>\n<td align=\"left\">\u52a8\u6001\u589e\u52a0\/\u5220\u9664\u4ea7\u54c1<\/td>\n<td align=\"left\">\u9700\u8981\u4e3a\u6bcf\u4e2a\u7c7b\u914d\u5907clone\u65b9\u6cd5<\/td>\n<\/tr>\n<tr>\n<td align=\"left\">\u7b80\u5316\u5bf9\u8c61\u521b\u5efa<\/td>\n<td align=\"left\">\u5bf9\u5df2\u6709\u7c7b\u6539\u9020\u9700\u5b9e\u73b0Cloneable<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>\u9002\u7528\u73af\u5883&#xff1a;\u521b\u5efa\u65b0\u5bf9\u8c61\u6210\u672c\u8f83\u5927&#xff1b;\u9700\u8981\u907f\u514d\u4f7f\u7528\u5206\u5c42\u6b21\u7684\u5de5\u5382\u7c7b\u3002<\/p>\n<hr \/>\n<h4>\u7b2c8\u7ae0 \u5355\u4f8b\u6a21\u5f0f<\/h4>\n<h5>8.1 \u5355\u4f8b\u6a21\u5f0f\u6982\u8ff0<\/h5>\n<p>\u5355\u4f8b\u6a21\u5f0f&#xff08;Singleton Pattern&#xff09;\u786e\u4fdd\u4e00\u4e2a\u7c7b\u53ea\u6709\u4e00\u4e2a\u5b9e\u4f8b&#xff0c;\u5e76\u63d0\u4f9b\u4e00\u4e2a\u5168\u5c40\u8bbf\u95ee\u70b9\u3002<\/p>\n<h5>8.2 \u5355\u4f8b\u6a21\u5f0f\u7ed3\u6784\u4e0e\u5b9e\u73b0<\/h5>\n<p>\u4e09\u4e2a\u6838\u5fc3\u8981\u70b9&#xff1a;<\/p>\n<li>\u79c1\u6709\u6784\u9020\u65b9\u6cd5<\/li>\n<li>\u79c1\u6709\u9759\u6001\u5b9e\u4f8b<\/li>\n<li>\u516c\u5171\u9759\u6001\u83b7\u53d6\u65b9\u6cd5<\/li>\n<h5>8.3 \u5355\u4f8b\u6a21\u5f0f\u5e94\u7528\u5b9e\u4f8b<\/h5>\n<p>\u6570\u636e\u5e93\u8fde\u63a5\u6c60\u3001\u7ebf\u7a0b\u6c60\u3001\u914d\u7f6e\u7ba1\u7406\u5668\u3001\u65e5\u5fd7\u8bb0\u5f55\u5668\u3001Spring\u4e2d\u7684Bean&#xff08;\u9ed8\u8ba4\u5355\u4f8b&#xff09;\u3002<\/p>\n<h5>8.4 \u997f\u6c49\u5f0f\u5355\u4f8b\u4e0e\u61d2\u6c49\u5f0f\u5355\u4f8b<\/h5>\n<p><span class=\"token comment\">\/\/ &#061;&#061;&#061;&#061;&#061;&#061;&#061;&#061;&#061;&#061; \u997f\u6c49\u5f0f&#xff1a;\u7c7b\u52a0\u8f7d\u65f6\u521b\u5efa&#xff0c;\u5929\u7136\u7ebf\u7a0b\u5b89\u5168 &#061;&#061;&#061;&#061;&#061;&#061;&#061;&#061;&#061;&#061;<\/span><br \/>\n<span class=\"token keyword\">public<\/span> <span class=\"token keyword\">class<\/span> <span class=\"token class-name\">HungrySingleton<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">private<\/span> <span class=\"token keyword\">static<\/span> <span class=\"token keyword\">final<\/span> <span class=\"token class-name\">HungrySingleton<\/span> <span class=\"token constant\">INSTANCE<\/span> <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">HungrySingleton<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">private<\/span> <span class=\"token class-name\">HungrySingleton<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><span class=\"token punctuation\">}<\/span><br \/>\n    <span class=\"token keyword\">public<\/span> <span class=\"token keyword\">static<\/span> <span class=\"token class-name\">HungrySingleton<\/span> <span class=\"token function\">getInstance<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span> <span class=\"token keyword\">return<\/span> <span class=\"token constant\">INSTANCE<\/span><span class=\"token punctuation\">;<\/span> <span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p><span class=\"token comment\">\/\/ &#061;&#061;&#061;&#061;&#061;&#061;&#061;&#061;&#061;&#061; \u61d2\u6c49\u5f0f&#xff08;\u53cc\u91cd\u68c0\u67e5\u9501DCL&#xff09;&#xff1a;\u5ef6\u8fdf\u521b\u5efa &#061;&#061;&#061;&#061;&#061;&#061;&#061;&#061;&#061;&#061;<\/span><br \/>\n<span class=\"token keyword\">public<\/span> <span class=\"token keyword\">class<\/span> <span class=\"token class-name\">LazySingleton<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">private<\/span> <span class=\"token keyword\">static<\/span> <span class=\"token keyword\">volatile<\/span> <span class=\"token class-name\">LazySingleton<\/span> instance<span class=\"token punctuation\">;<\/span>  <span class=\"token comment\">\/\/ volatile\u9632\u6b62\u6307\u4ee4\u91cd\u6392<\/span><br \/>\n    <span class=\"token keyword\">private<\/span> <span class=\"token class-name\">LazySingleton<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><span class=\"token punctuation\">}<\/span><\/p>\n<p>    <span class=\"token keyword\">public<\/span> <span class=\"token keyword\">static<\/span> <span class=\"token class-name\">LazySingleton<\/span> <span class=\"token function\">getInstance<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>instance <span class=\"token operator\">&#061;&#061;<\/span> <span class=\"token keyword\">null<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span>                    <span class=\"token comment\">\/\/ \u7b2c\u4e00\u6b21\u68c0\u67e5&#xff08;\u65e0\u9501&#xff09;<\/span><br \/>\n            <span class=\"token keyword\">synchronized<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token class-name\">LazySingleton<\/span><span class=\"token punctuation\">.<\/span><span class=\"token keyword\">class<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n                <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>instance <span class=\"token operator\">&#061;&#061;<\/span> <span class=\"token keyword\">null<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span>            <span class=\"token comment\">\/\/ \u7b2c\u4e8c\u6b21\u68c0\u67e5&#xff08;\u6709\u9501&#xff09;<\/span><br \/>\n                    instance <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">LazySingleton<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n                <span class=\"token punctuation\">}<\/span><br \/>\n            <span class=\"token punctuation\">}<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span><br \/>\n        <span class=\"token keyword\">return<\/span> instance<span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<h5>8.5 \u4f7f\u7528\u9759\u6001\u5185\u90e8\u7c7b\u548c\u679a\u4e3e\u5b9e\u73b0\u5355\u4f8b\u6a21\u5f0f<\/h5>\n<p><span class=\"token comment\">\/\/ &#061;&#061;&#061;&#061;&#061;&#061;&#061;&#061;&#061;&#061; \u9759\u6001\u5185\u90e8\u7c7b&#xff1a;\u5ef6\u8fdf\u52a0\u8f7d &#043; \u7ebf\u7a0b\u5b89\u5168&#xff08;\u63a8\u8350&#xff09; &#061;&#061;&#061;&#061;&#061;&#061;&#061;&#061;&#061;&#061;<\/span><br \/>\n<span class=\"token keyword\">public<\/span> <span class=\"token keyword\">class<\/span> <span class=\"token class-name\">InnerClassSingleton<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">private<\/span> <span class=\"token class-name\">InnerClassSingleton<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><span class=\"token punctuation\">}<\/span><\/p>\n<p>    <span class=\"token keyword\">private<\/span> <span class=\"token keyword\">static<\/span> <span class=\"token keyword\">class<\/span> <span class=\"token class-name\">Holder<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token keyword\">private<\/span> <span class=\"token keyword\">static<\/span> <span class=\"token keyword\">final<\/span> <span class=\"token class-name\">InnerClassSingleton<\/span> <span class=\"token constant\">INSTANCE<\/span> <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">InnerClassSingleton<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><\/p>\n<p>    <span class=\"token keyword\">public<\/span> <span class=\"token keyword\">static<\/span> <span class=\"token class-name\">InnerClassSingleton<\/span> <span class=\"token function\">getInstance<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token keyword\">return<\/span> <span class=\"token class-name\">Holder<\/span><span class=\"token punctuation\">.<\/span><span class=\"token constant\">INSTANCE<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p><span class=\"token comment\">\/\/ &#061;&#061;&#061;&#061;&#061;&#061;&#061;&#061;&#061;&#061; \u679a\u4e3e\u5355\u4f8b&#xff1a;\u6700\u7b80\u6d01&#xff0c;\u5929\u7136\u9632\u53cd\u5c04\u548c\u5e8f\u5217\u5316\u7834\u574f&#xff08;\u6700\u4f73&#xff09; &#061;&#061;&#061;&#061;&#061;&#061;&#061;&#061;&#061;&#061;<\/span><br \/>\n<span class=\"token keyword\">public<\/span> <span class=\"token keyword\">enum<\/span> <span class=\"token class-name\">EnumSingleton<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token constant\">INSTANCE<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token keyword\">public<\/span> <span class=\"token keyword\">void<\/span> <span class=\"token function\">doSomething<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token class-name\">System<\/span><span class=\"token punctuation\">.<\/span>out<span class=\"token punctuation\">.<\/span><span class=\"token function\">println<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;\u6267\u884c\u4e1a\u52a1\u903b\u8f91&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<h5>8.6 \u5355\u4f8b\u6a21\u5f0f\u4f18\u7f3a\u70b9\u4e0e\u9002\u7528\u73af\u5883<\/h5>\n<table>\n<tr>\u4f18\u70b9 \u2705\u7f3a\u70b9 \u274c<\/tr>\n<tbody>\n<tr>\n<td align=\"left\">\u8282\u7ea6\u7cfb\u7edf\u8d44\u6e90<\/td>\n<td align=\"left\">\u6269\u5c55\u56f0\u96be&#xff0c;\u4e0d\u5229\u4e8e\u5b50\u7c7b\u5316<\/td>\n<\/tr>\n<tr>\n<td align=\"left\">\u5168\u5c40\u552f\u4e00&#xff0c;\u907f\u514d\u51b2\u7a81<\/td>\n<td align=\"left\">\u8fdd\u53cdSRP&#xff08;\u65e2\u7ba1\u521b\u5efa\u53c8\u7ba1\u4e1a\u52a1&#xff09;<\/td>\n<\/tr>\n<tr>\n<td align=\"left\">\u5ef6\u8fdf\u52a0\u8f7d\u8282\u7701\u5185\u5b58<\/td>\n<td align=\"left\">\u5bf9\u5e76\u53d1\u6d4b\u8bd5\u4e0d\u53cb\u597d<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>\u9002\u7528\u73af\u5883&#xff1a;\u7cfb\u7edf\u4e2d\u67d0\u4e2a\u7c7b\u53ea\u9700\u8981\u4e00\u4e2a\u5b9e\u4f8b&#xff08;\u5982\u914d\u7f6e\u3001\u8fde\u63a5\u6c60\u3001\u65e5\u5fd7&#xff09;\u3002<\/p>\n<hr \/>\n<h3>\u7b2c\u4e09\u90e8\u5206&#xff1a;\u7ed3\u6784\u578b\u8bbe\u8ba1\u6a21\u5f0f<\/h3>\n<p>&#x1f9e9; \u6838\u5fc3\u601d\u60f3&#xff1a;\u5c06\u7c7b\u6216\u5bf9\u8c61\u6309\u7167\u67d0\u79cd\u5e03\u5c40\u7ec4\u5408\u6210\u66f4\u5927\u7684\u7ed3\u6784&#xff0c;\u5b9e\u73b0\u65b0\u7684\u529f\u80fd\u3002<\/p>\n<h4>\u7b2c9\u7ae0 \u9002\u914d\u5668\u6a21\u5f0f<\/h4>\n<h5>9.1 \u7ed3\u6784\u578b\u6a21\u5f0f\u6982\u8ff0<\/h5>\n<p>\u7ed3\u6784\u578b\u6a21\u5f0f\u5173\u6ce8\u5982\u4f55\u5c06\u7c7b\u6216\u5bf9\u8c61\u7ec4\u5408\u6210\u66f4\u5927\u7684\u7ed3\u6784\u3002\u5305\u62ec&#xff1a;\u9002\u914d\u5668\u3001\u6865\u63a5\u3001\u7ec4\u5408\u3001\u88c5\u9970\u3001\u5916\u89c2\u3001\u4eab\u5143\u3001\u4ee3\u7406\u3002<\/p>\n<h5>9.2 \u9002\u914d\u5668\u6a21\u5f0f\u6982\u8ff0<\/h5>\n<p>\u9002\u914d\u5668\u6a21\u5f0f&#xff08;Adapter Pattern&#xff09;\u5c06\u4e00\u4e2a\u7c7b\u7684\u63a5\u53e3\u8f6c\u6362\u6210\u5ba2\u6237\u5e0c\u671b\u7684\u53e6\u4e00\u4e2a\u63a5\u53e3\u3002\u4f7f\u5f97\u539f\u672c\u56e0\u63a5\u53e3\u4e0d\u517c\u5bb9\u800c\u4e0d\u80fd\u4e00\u8d77\u5de5\u4f5c\u7684\u7c7b\u53ef\u4ee5\u4e00\u8d77\u5de5\u4f5c\u3002<\/p>\n<p>&#x1f4a1; \u751f\u6d3b\u7c7b\u6bd4&#xff1a;\u7535\u6e90\u8f6c\u6362\u63d2\u5934&#xff08;\u4e2d\u56fd\u63d2\u5934 \u2192 \u6b27\u6807\u63d2\u5ea7&#xff09;<\/p>\n<h5>9.3 \u9002\u914d\u5668\u6a21\u5f0f\u7ed3\u6784\u4e0e\u5b9e\u73b0<\/h5>\n<p><span class=\"token comment\">\/\/ \u76ee\u6807\u63a5\u53e3&#xff08;\u5ba2\u6237\u7aef\u671f\u671b\u7684\u63a5\u53e3&#xff09;<\/span><br \/>\n<span class=\"token keyword\">public<\/span> <span class=\"token keyword\">interface<\/span> <span class=\"token class-name\">Target<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">void<\/span> <span class=\"token function\">request<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p><span class=\"token comment\">\/\/ \u88ab\u9002\u914d\u8005&#xff08;\u5df2\u6709\u7684\u3001\u4e0d\u517c\u5bb9\u7684\u63a5\u53e3&#xff09;<\/span><br \/>\n<span class=\"token keyword\">public<\/span> <span class=\"token keyword\">class<\/span> <span class=\"token class-name\">Adaptee<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">public<\/span> <span class=\"token keyword\">void<\/span> <span class=\"token function\">specificRequest<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token class-name\">System<\/span><span class=\"token punctuation\">.<\/span>out<span class=\"token punctuation\">.<\/span><span class=\"token function\">println<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;\u88ab\u9002\u914d\u8005\u7684\u7279\u6b8a\u8bf7\u6c42&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p><span class=\"token comment\">\/\/ \u5bf9\u8c61\u9002\u914d\u5668&#xff08;\u7ec4\u5408\u65b9\u5f0f&#xff0c;\u63a8\u8350&#xff09;<\/span><br \/>\n<span class=\"token keyword\">public<\/span> <span class=\"token keyword\">class<\/span> <span class=\"token class-name\">ObjectAdapter<\/span> <span class=\"token keyword\">implements<\/span> <span class=\"token class-name\">Target<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">private<\/span> <span class=\"token class-name\">Adaptee<\/span> adaptee<span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token keyword\">public<\/span> <span class=\"token class-name\">ObjectAdapter<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">Adaptee<\/span> adaptee<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token keyword\">this<\/span><span class=\"token punctuation\">.<\/span>adaptee <span class=\"token operator\">&#061;<\/span> adaptee<span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><\/p>\n<p>    <span class=\"token annotation punctuation\">&#064;Override<\/span><br \/>\n    <span class=\"token keyword\">public<\/span> <span class=\"token keyword\">void<\/span> <span class=\"token function\">request<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        adaptee<span class=\"token punctuation\">.<\/span><span class=\"token function\">specificRequest<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>  <span class=\"token comment\">\/\/ \u59d4\u6258\u8c03\u7528<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p><span class=\"token comment\">\/\/ \u7c7b\u9002\u914d\u5668&#xff08;\u7ee7\u627f\u65b9\u5f0f&#xff09;<\/span><br \/>\n<span class=\"token keyword\">public<\/span> <span class=\"token keyword\">class<\/span> <span class=\"token class-name\">ClassAdapter<\/span> <span class=\"token keyword\">extends<\/span> <span class=\"token class-name\">Adaptee<\/span> <span class=\"token keyword\">implements<\/span> <span class=\"token class-name\">Target<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token annotation punctuation\">&#064;Override<\/span><br \/>\n    <span class=\"token keyword\">public<\/span> <span class=\"token keyword\">void<\/span> <span class=\"token function\">request<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token keyword\">this<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">specificRequest<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>  <span class=\"token comment\">\/\/ \u76f4\u63a5\u8c03\u7528\u7236\u7c7b\u65b9\u6cd5<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<h5>9.4 \u9002\u914d\u5668\u6a21\u5f0f\u5e94\u7528\u5b9e\u4f8b<\/h5>\n<ul>\n<li>\u7535\u538b\u8f6c\u6362\u5668&#xff08;220V \u2192 110V&#xff09;<\/li>\n<li>\u65e7\u7cfb\u7edf\u63a5\u53e3\u517c\u5bb9<\/li>\n<li>\u7b2c\u4e09\u65b9SDK\u5c01\u88c5&#xff08;\u5982\u652f\u4ed8SDK\u7edf\u4e00\u63a5\u53e3&#xff09;<\/li>\n<li>Arrays.asList() \u5c06\u6570\u7ec4\u9002\u914d\u4e3aList<\/li>\n<\/ul>\n<h5>9.5 \u7f3a\u7701\u9002\u914d\u5668\u6a21\u5f0f<\/h5>\n<p>\u5f53\u4e0d\u9700\u8981\u5b9e\u73b0\u63a5\u53e3\u4e2d\u6240\u6709\u65b9\u6cd5\u65f6&#xff0c;\u63d0\u4f9b\u4e00\u4e2a\u62bd\u8c61\u7c7b\u5b9e\u73b0\u63a5\u53e3\u7684\u6240\u6709\u65b9\u6cd5&#xff08;\u7a7a\u5b9e\u73b0&#xff09;&#xff1a;<\/p>\n<p><span class=\"token comment\">\/\/ JDK\u4e2d\u7684\u7ecf\u5178\u6848\u4f8b<\/span><br \/>\n<span class=\"token keyword\">public<\/span> <span class=\"token keyword\">abstract<\/span> <span class=\"token keyword\">class<\/span> <span class=\"token class-name\">WindowAdapter<\/span> <span class=\"token keyword\">implements<\/span> <span class=\"token class-name\">WindowListener<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">public<\/span> <span class=\"token keyword\">void<\/span> <span class=\"token function\">windowOpened<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">WindowEvent<\/span> e<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><span class=\"token punctuation\">}<\/span><br \/>\n    <span class=\"token keyword\">public<\/span> <span class=\"token keyword\">void<\/span> <span class=\"token function\">windowClosing<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">WindowEvent<\/span> e<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><span class=\"token punctuation\">}<\/span><br \/>\n    <span class=\"token keyword\">public<\/span> <span class=\"token keyword\">void<\/span> <span class=\"token function\">windowClosed<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">WindowEvent<\/span> e<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><span class=\"token punctuation\">}<\/span><br \/>\n    <span class=\"token comment\">\/\/ &#8230; \u5176\u4ed6\u7a7a\u5b9e\u73b0<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p><span class=\"token comment\">\/\/ \u53ea\u9700\u8986\u76d6\u5173\u5fc3\u7684\u65b9\u6cd5<\/span><br \/>\n<span class=\"token keyword\">public<\/span> <span class=\"token keyword\">class<\/span> <span class=\"token class-name\">MyListener<\/span> <span class=\"token keyword\">extends<\/span> <span class=\"token class-name\">WindowAdapter<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token annotation punctuation\">&#064;Override<\/span><br \/>\n    <span class=\"token keyword\">public<\/span> <span class=\"token keyword\">void<\/span> <span class=\"token function\">windowClosing<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">WindowEvent<\/span> e<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token class-name\">System<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">exit<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">0<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<h5>9.6 \u53cc\u5411\u9002\u914d\u5668<\/h5>\n<p>\u540c\u65f6\u9002\u914d\u4e24\u4e2a\u63a5\u53e3&#xff0c;\u4f7f\u5f97\u4e24\u4e2a\u4e0d\u517c\u5bb9\u7684\u7cfb\u7edf\u53ef\u4ee5\u4e92\u76f8\u8c03\u7528\u3002<\/p>\n<h5>9.7 \u9002\u914d\u5668\u6a21\u5f0f\u4f18\u7f3a\u70b9\u4e0e\u9002\u7528\u73af\u5883<\/h5>\n<table>\n<tr>\u4f18\u70b9 \u2705\u7f3a\u70b9 \u274c<\/tr>\n<tbody>\n<tr>\n<td align=\"left\">\u590d\u7528\u73b0\u6709\u7c7b&#xff0c;\u65e0\u9700\u4fee\u6539\u6e90\u7801<\/td>\n<td align=\"left\">\u8fc7\u591a\u4f7f\u7528\u4f1a\u4f7f\u7cfb\u7edf\u7ed3\u6784\u6df7\u4e71<\/td>\n<\/tr>\n<tr>\n<td align=\"left\">\u589e\u52a0\u4e86\u7c7b\u7684\u900f\u660e\u6027\u548c\u590d\u7528\u6027<\/td>\n<td align=\"left\">\u4e00\u6b21\u53ea\u80fd\u9002\u914d\u4e00\u4e2a\u88ab\u9002\u914d\u8005<\/td>\n<\/tr>\n<tr>\n<td align=\"left\">\u7075\u6d3b\u6027\u597d&#xff0c;\u53ef\u968f\u65f6\u66ff\u6362<\/td>\n<td align=\"left\">\u7c7b\u9002\u914d\u5668\u53d7\u5355\u7ee7\u627f\u9650\u5236<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>\u9002\u7528\u73af\u5883&#xff1a;\u7cfb\u7edf\u9700\u8981\u4f7f\u7528\u73b0\u6709\u7c7b&#xff0c;\u4f46\u5176\u63a5\u53e3\u4e0d\u7b26\u5408\u9700\u6c42\u3002<\/p>\n<hr \/>\n<h4>\u7b2c10\u7ae0 \u6865\u63a5\u6a21\u5f0f<\/h4>\n<h5>10.1 \u6865\u63a5\u6a21\u5f0f\u6982\u8ff0<\/h5>\n<p>\u6865\u63a5\u6a21\u5f0f&#xff08;Bridge Pattern&#xff09;\u5c06\u62bd\u8c61\u90e8\u5206\u4e0e\u5b83\u7684\u5b9e\u73b0\u90e8\u5206\u5206\u79bb&#xff0c;\u4f7f\u5b83\u4eec\u90fd\u53ef\u4ee5\u72ec\u7acb\u5730\u53d8\u5316\u3002\u89e3\u51b3\u591a\u7ef4\u5ea6\u53d8\u5316\u5bfc\u81f4\u7684\u7c7b\u7206\u70b8\u95ee\u9898\u3002<\/p>\n<p>&#x1f4a1; \u7ecf\u5178\u573a\u666f&#xff1a;\u5f62\u72b6&#xff08;\u5706\u3001\u65b9&#xff09;\u00d7 \u989c\u8272&#xff08;\u7ea2\u3001\u84dd&#xff09;\u2192 \u4e0d\u7528\u6865\u63a5\u9700\u89814\u4e2a\u7c7b&#xff0c;3\u4e2a\u7ef4\u5ea6\u5c31\u9700\u89818\u4e2a\u7c7b&#xff01;<\/p>\n<h5>10.2 \u6865\u63a5\u6a21\u5f0f\u7ed3\u6784\u4e0e\u5b9e\u73b0<\/h5>\n<p><span class=\"token comment\">\/\/ &#061;&#061;&#061;&#061;&#061; \u5b9e\u73b0\u5316\u7ef4\u5ea6&#xff1a;\u989c\u8272 &#061;&#061;&#061;&#061;&#061;<\/span><br \/>\n<span class=\"token keyword\">public<\/span> <span class=\"token keyword\">interface<\/span> <span class=\"token class-name\">Color<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token class-name\">String<\/span> <span class=\"token function\">getColor<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token keyword\">public<\/span> <span class=\"token keyword\">class<\/span> <span class=\"token class-name\">Red<\/span> <span class=\"token keyword\">implements<\/span> <span class=\"token class-name\">Color<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">public<\/span> <span class=\"token class-name\">String<\/span> <span class=\"token function\">getColor<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span> <span class=\"token keyword\">return<\/span> <span class=\"token string\">&#034;\u7ea2\u8272&#034;<\/span><span class=\"token punctuation\">;<\/span> <span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token keyword\">public<\/span> <span class=\"token keyword\">class<\/span> <span class=\"token class-name\">Blue<\/span> <span class=\"token keyword\">implements<\/span> <span class=\"token class-name\">Color<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">public<\/span> <span class=\"token class-name\">String<\/span> <span class=\"token function\">getColor<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span> <span class=\"token keyword\">return<\/span> <span class=\"token string\">&#034;\u84dd\u8272&#034;<\/span><span class=\"token punctuation\">;<\/span> <span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p><span class=\"token comment\">\/\/ &#061;&#061;&#061;&#061;&#061; \u62bd\u8c61\u5316\u7ef4\u5ea6&#xff1a;\u5f62\u72b6 &#061;&#061;&#061;&#061;&#061;<\/span><br \/>\n<span class=\"token keyword\">public<\/span> <span class=\"token keyword\">abstract<\/span> <span class=\"token keyword\">class<\/span> <span class=\"token class-name\">Shape<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">protected<\/span> <span class=\"token class-name\">Color<\/span> color<span class=\"token punctuation\">;<\/span>  <span class=\"token comment\">\/\/ \u6865\u63a5\u70b9<\/span><\/p>\n<p>    <span class=\"token keyword\">public<\/span> <span class=\"token class-name\">Shape<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">Color<\/span> color<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span> <span class=\"token keyword\">this<\/span><span class=\"token punctuation\">.<\/span>color <span class=\"token operator\">&#061;<\/span> color<span class=\"token punctuation\">;<\/span> <span class=\"token punctuation\">}<\/span><br \/>\n    <span class=\"token keyword\">public<\/span> <span class=\"token keyword\">abstract<\/span> <span class=\"token keyword\">void<\/span> <span class=\"token function\">draw<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p><span class=\"token keyword\">public<\/span> <span class=\"token keyword\">class<\/span> <span class=\"token class-name\">Circle<\/span> <span class=\"token keyword\">extends<\/span> <span class=\"token class-name\">Shape<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">public<\/span> <span class=\"token class-name\">Circle<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">Color<\/span> color<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span> <span class=\"token keyword\">super<\/span><span class=\"token punctuation\">(<\/span>color<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span> <span class=\"token punctuation\">}<\/span><\/p>\n<p>    <span class=\"token annotation punctuation\">&#064;Override<\/span><br \/>\n    <span class=\"token keyword\">public<\/span> <span class=\"token keyword\">void<\/span> <span class=\"token function\">draw<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token class-name\">System<\/span><span class=\"token punctuation\">.<\/span>out<span class=\"token punctuation\">.<\/span><span class=\"token function\">println<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;\u753b\u4e00\u4e2a&#034;<\/span> <span class=\"token operator\">&#043;<\/span> color<span class=\"token punctuation\">.<\/span><span class=\"token function\">getColor<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token operator\">&#043;<\/span> <span class=\"token string\">&#034;\u7684\u5706\u5f62&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p><span class=\"token comment\">\/\/ \u5ba2\u6237\u7aef&#xff1a;\u81ea\u7531\u7ec4\u5408<\/span><br \/>\n<span class=\"token class-name\">Shape<\/span> redCircle <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">Circle<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">new<\/span> <span class=\"token class-name\">Red<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token class-name\">Shape<\/span> blueCircle <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">Circle<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">new<\/span> <span class=\"token class-name\">Blue<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<h5>10.3 \u6865\u63a5\u6a21\u5f0f\u5e94\u7528\u5b9e\u4f8b<\/h5>\n<ul>\n<li>\u8de8\u5e73\u53f0\u56fe\u5f62\u5e93&#xff08;\u5f62\u72b6 \u00d7 \u989c\u8272 \u00d7 \u5e73\u53f0&#xff09;<\/li>\n<li>JDBC\u9a71\u52a8\u67b6\u6784&#xff08;\u62bd\u8c61API \u00d7 \u5177\u4f53\u6570\u636e\u5e93\u9a71\u52a8&#xff09;<\/li>\n<li>\u9065\u63a7\u5668 \u00d7 \u7535\u89c6\u673a&#xff08;\u4e0d\u540c\u54c1\u724c\u7535\u89c6\u7528\u540c\u4e00\u9065\u63a7\u5668&#xff09;<\/li>\n<\/ul>\n<h5>10.4 \u6865\u63a5\u6a21\u5f0f\u4e0e\u9002\u914d\u5668\u6a21\u5f0f\u7684\u8054\u7528<\/h5>\n<table>\n<tr>\u5bf9\u6bd4\u9879\u6865\u63a5\u6a21\u5f0f\u9002\u914d\u5668\u6a21\u5f0f<\/tr>\n<tbody>\n<tr>\n<td align=\"center\">\u4f7f\u7528\u65f6\u673a<\/td>\n<td align=\"center\">\u8bbe\u8ba1\u9636\u6bb5&#xff08;\u9884\u9632\u6027&#xff09;<\/td>\n<td align=\"center\">\u5b9e\u73b0\u9636\u6bb5&#xff08;\u8865\u6551\u6027&#xff09;<\/td>\n<\/tr>\n<tr>\n<td align=\"center\">\u76ee\u7684<\/td>\n<td align=\"center\">\u5206\u79bb\u591a\u7ef4\u5ea6\u53d8\u5316<\/td>\n<td align=\"center\">\u517c\u5bb9\u5df2\u6709\u63a5\u53e3<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>\u4e24\u8005\u53ef\u4ee5\u8054\u5408\u4f7f\u7528\u3002<\/p>\n<h5>10.5 \u6865\u63a5\u6a21\u5f0f\u4f18\u7f3a\u70b9\u4e0e\u9002\u7528\u73af\u5883<\/h5>\n<p>\u9002\u7528\u73af\u5883&#xff1a;\u4e00\u4e2a\u7c7b\u5b58\u5728\u4e24\u4e2a&#xff08;\u6216\u591a\u4e2a&#xff09;\u72ec\u7acb\u53d8\u5316\u7684\u7ef4\u5ea6&#xff1b;\u4e0d\u5e0c\u671b\u4f7f\u7528\u7ee7\u627f\u5bfc\u81f4\u7c7b\u6570\u91cf\u6025\u5267\u589e\u52a0\u3002<\/p>\n<hr \/>\n<h4>\u7b2c11\u7ae0 \u7ec4\u5408\u6a21\u5f0f<\/h4>\n<h5>11.1 \u7ec4\u5408\u6a21\u5f0f\u6982\u8ff0<\/h5>\n<p>\u7ec4\u5408\u6a21\u5f0f&#xff08;Composite Pattern&#xff09;\u5c06\u5bf9\u8c61\u7ec4\u5408\u6210\u6811\u5f62\u7ed3\u6784\u4ee5\u8868\u793a&#034;\u90e8\u5206-\u6574\u4f53&#034;\u7684\u5c42\u6b21\u7ed3\u6784&#xff0c;\u4f7f\u5f97\u7528\u6237\u5bf9\u5355\u4e2a\u5bf9\u8c61\u548c\u7ec4\u5408\u5bf9\u8c61\u7684\u4f7f\u7528\u5177\u6709\u4e00\u81f4\u6027\u3002<\/p>\n<h5>11.2 \u7ec4\u5408\u6a21\u5f0f\u7ed3\u6784\u4e0e\u5b9e\u73b0<\/h5>\n<p><span class=\"token comment\">\/\/ \u62bd\u8c61\u6784\u4ef6<\/span><br \/>\n<span class=\"token keyword\">public<\/span> <span class=\"token keyword\">abstract<\/span> <span class=\"token keyword\">class<\/span> <span class=\"token class-name\">Component<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">protected<\/span> <span class=\"token class-name\">String<\/span> name<span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">public<\/span> <span class=\"token class-name\">Component<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">String<\/span> name<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span> <span class=\"token keyword\">this<\/span><span class=\"token punctuation\">.<\/span>name <span class=\"token operator\">&#061;<\/span> name<span class=\"token punctuation\">;<\/span> <span class=\"token punctuation\">}<\/span><br \/>\n    <span class=\"token keyword\">public<\/span> <span class=\"token keyword\">abstract<\/span> <span class=\"token keyword\">void<\/span> <span class=\"token function\">operation<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">int<\/span> depth<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p><span class=\"token comment\">\/\/ \u53f6\u5b50\u6784\u4ef6<\/span><br \/>\n<span class=\"token keyword\">public<\/span> <span class=\"token keyword\">class<\/span> <span class=\"token class-name\">Leaf<\/span> <span class=\"token keyword\">extends<\/span> <span class=\"token class-name\">Component<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">public<\/span> <span class=\"token class-name\">Leaf<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">String<\/span> name<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span> <span class=\"token keyword\">super<\/span><span class=\"token punctuation\">(<\/span>name<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span> <span class=\"token punctuation\">}<\/span><\/p>\n<p>    <span class=\"token annotation punctuation\">&#064;Override<\/span><br \/>\n    <span class=\"token keyword\">public<\/span> <span class=\"token keyword\">void<\/span> <span class=\"token function\">operation<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">int<\/span> depth<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token class-name\">System<\/span><span class=\"token punctuation\">.<\/span>out<span class=\"token punctuation\">.<\/span><span class=\"token function\">println<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;-&#034;<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">repeat<\/span><span class=\"token punctuation\">(<\/span>depth<span class=\"token punctuation\">)<\/span> <span class=\"token operator\">&#043;<\/span> name<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p><span class=\"token comment\">\/\/ \u5bb9\u5668\u6784\u4ef6<\/span><br \/>\n<span class=\"token keyword\">public<\/span> <span class=\"token keyword\">class<\/span> <span class=\"token class-name\">Composite<\/span> <span class=\"token keyword\">extends<\/span> <span class=\"token class-name\">Component<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">private<\/span> <span class=\"token class-name\">List<\/span><span class=\"token generics\"><span class=\"token punctuation\">&lt;<\/span><span class=\"token class-name\">Component<\/span><span class=\"token punctuation\">&gt;<\/span><\/span> children <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">ArrayList<\/span><span class=\"token generics\"><span class=\"token punctuation\">&lt;<\/span><span class=\"token punctuation\">&gt;<\/span><\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token keyword\">public<\/span> <span class=\"token class-name\">Composite<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">String<\/span> name<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span> <span class=\"token keyword\">super<\/span><span class=\"token punctuation\">(<\/span>name<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span> <span class=\"token punctuation\">}<\/span><br \/>\n    <span class=\"token keyword\">public<\/span> <span class=\"token keyword\">void<\/span> <span class=\"token function\">add<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">Component<\/span> c<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span> children<span class=\"token punctuation\">.<\/span><span class=\"token function\">add<\/span><span class=\"token punctuation\">(<\/span>c<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span> <span class=\"token punctuation\">}<\/span><br \/>\n    <span class=\"token keyword\">public<\/span> <span class=\"token keyword\">void<\/span> <span class=\"token function\">remove<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">Component<\/span> c<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span> children<span class=\"token punctuation\">.<\/span><span class=\"token function\">remove<\/span><span class=\"token punctuation\">(<\/span>c<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span> <span class=\"token punctuation\">}<\/span><\/p>\n<p>    <span class=\"token annotation punctuation\">&#064;Override<\/span><br \/>\n    <span class=\"token keyword\">public<\/span> <span class=\"token keyword\">void<\/span> <span class=\"token function\">operation<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">int<\/span> depth<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token class-name\">System<\/span><span class=\"token punctuation\">.<\/span>out<span class=\"token punctuation\">.<\/span><span class=\"token function\">println<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;-&#034;<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">repeat<\/span><span class=\"token punctuation\">(<\/span>depth<span class=\"token punctuation\">)<\/span> <span class=\"token operator\">&#043;<\/span> name<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">for<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token class-name\">Component<\/span> child <span class=\"token operator\">:<\/span> children<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n            child<span class=\"token punctuation\">.<\/span><span class=\"token function\">operation<\/span><span class=\"token punctuation\">(<\/span>depth <span class=\"token operator\">&#043;<\/span> <span class=\"token number\">2<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<h5>11.3 \u7ec4\u5408\u6a21\u5f0f\u5e94\u7528\u5b9e\u4f8b<\/h5>\n<ul>\n<li>\u6587\u4ef6\u7cfb\u7edf&#xff08;\u6587\u4ef6\/\u6587\u4ef6\u5939&#xff09;<\/li>\n<li>\u7ec4\u7ec7\u67b6\u6784&#xff08;\u516c\u53f8\u2192\u90e8\u95e8\u2192\u5c0f\u7ec4\u2192\u5458\u5de5&#xff09;<\/li>\n<li>XML\/HTML\u6587\u6863\u89e3\u6790<\/li>\n<li>GUI\u5bb9\u5668&#xff08;Window\u2192Panel\u2192Button&#xff09;<\/li>\n<\/ul>\n<h5>11.4 \u900f\u660e\u7ec4\u5408\u6a21\u5f0f\u4e0e\u5b89\u5168\u7ec4\u5408\u6a21\u5f0f<\/h5>\n<table>\n<tr>\u7c7b\u578b\u7279\u70b9\u7f3a\u70b9<\/tr>\n<tbody>\n<tr>\n<td align=\"center\">\u900f\u660e\u5f0f<\/td>\n<td align=\"left\">Component\u4e2d\u58f0\u660eadd\/remove<\/td>\n<td align=\"left\">\u53f6\u5b50\u8282\u70b9\u8c03\u7528add\u65e0\u610f\u4e49&#xff0c;\u9700\u629b\u5f02\u5e38<\/td>\n<\/tr>\n<tr>\n<td align=\"center\">\u5b89\u5168\u5f0f<\/td>\n<td align=\"left\">\u53ea\u5728Composite\u4e2d\u58f0\u660e\u7ba1\u7406\u65b9\u6cd5<\/td>\n<td align=\"left\">\u5ba2\u6237\u7aef\u9700\u533a\u5206\u53f6\u5b50\u548c\u5bb9\u5668<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h5>11.5 \u7ec4\u5408\u6a21\u5f0f\u4f18\u7f3a\u70b9\u4e0e\u9002\u7528\u73af\u5883<\/h5>\n<p>\u9002\u7528\u73af\u5883&#xff1a;\u8868\u793a\u5bf9\u8c61\u7684\u90e8\u5206-\u6574\u4f53\u5c42\u6b21\u7ed3\u6784&#xff1b;\u5e0c\u671b\u7528\u6237\u5ffd\u7565\u7ec4\u5408\u5bf9\u8c61\u4e0e\u5355\u4e2a\u5bf9\u8c61\u7684\u4e0d\u540c\u3002<\/p>\n<hr \/>\n<h4>\u7b2c12\u7ae0 \u88c5\u9970\u6a21\u5f0f<\/h4>\n<h5>12.1 \u88c5\u9970\u6a21\u5f0f\u6982\u8ff0<\/h5>\n<p>\u88c5\u9970\u6a21\u5f0f&#xff08;Decorator Pattern&#xff09;\u52a8\u6001\u5730\u7ed9\u4e00\u4e2a\u5bf9\u8c61\u6dfb\u52a0\u4e00\u4e9b\u989d\u5916\u7684\u804c\u8d23&#xff0c;\u6bd4\u7ee7\u627f\u66f4\u7075\u6d3b\u3002\u662f&#034;\u7ec4\u5408\u4f18\u4e8e\u7ee7\u627f&#034;\u539f\u5219\u7684\u5178\u578b\u4f53\u73b0\u3002<\/p>\n<p>&#x1f4a1; Java I\/O\u6d41\u5c31\u662f\u88c5\u9970\u6a21\u5f0f\u7684\u6559\u79d1\u4e66\u7ea7\u5e94\u7528&#xff01;<\/p>\n<h5>12.2 \u88c5\u9970\u6a21\u5f0f\u7ed3\u6784\u4e0e\u5b9e\u73b0<\/h5>\n<p><span class=\"token comment\">\/\/ \u62bd\u8c61\u6784\u4ef6<\/span><br \/>\n<span class=\"token keyword\">public<\/span> <span class=\"token keyword\">interface<\/span> <span class=\"token class-name\">DataSource<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">void<\/span> <span class=\"token function\">writeData<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">String<\/span> data<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token class-name\">String<\/span> <span class=\"token function\">readData<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p><span class=\"token comment\">\/\/ \u5177\u4f53\u6784\u4ef6<\/span><br \/>\n<span class=\"token keyword\">public<\/span> <span class=\"token keyword\">class<\/span> <span class=\"token class-name\">FileDataSource<\/span> <span class=\"token keyword\">implements<\/span> <span class=\"token class-name\">DataSource<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">private<\/span> <span class=\"token class-name\">String<\/span> filename<span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">public<\/span> <span class=\"token class-name\">FileDataSource<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">String<\/span> filename<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span> <span class=\"token keyword\">this<\/span><span class=\"token punctuation\">.<\/span>filename <span class=\"token operator\">&#061;<\/span> filename<span class=\"token punctuation\">;<\/span> <span class=\"token punctuation\">}<\/span><br \/>\n    <span class=\"token keyword\">public<\/span> <span class=\"token keyword\">void<\/span> <span class=\"token function\">writeData<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">String<\/span> data<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span> <span class=\"token comment\">\/* \u5199\u6587\u4ef6 *\/<\/span> <span class=\"token punctuation\">}<\/span><br \/>\n    <span class=\"token keyword\">public<\/span> <span class=\"token class-name\">String<\/span> <span class=\"token function\">readData<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span> <span class=\"token keyword\">return<\/span> <span class=\"token string\">&#034;\u6587\u4ef6\u5185\u5bb9&#034;<\/span><span class=\"token punctuation\">;<\/span> <span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p><span class=\"token comment\">\/\/ \u88c5\u9970\u5668\u57fa\u7c7b&#xff08;\u5173\u952e&#xff1a;\u5b9e\u73b0\u540c\u4e00\u63a5\u53e3 &#043; \u6301\u6709\u6784\u4ef6\u5f15\u7528&#xff09;<\/span><br \/>\n<span class=\"token keyword\">public<\/span> <span class=\"token keyword\">class<\/span> <span class=\"token class-name\">DataSourceDecorator<\/span> <span class=\"token keyword\">implements<\/span> <span class=\"token class-name\">DataSource<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">protected<\/span> <span class=\"token class-name\">DataSource<\/span> wrappee<span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token keyword\">public<\/span> <span class=\"token class-name\">DataSourceDecorator<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">DataSource<\/span> source<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span> <span class=\"token keyword\">this<\/span><span class=\"token punctuation\">.<\/span>wrappee <span class=\"token operator\">&#061;<\/span> source<span class=\"token punctuation\">;<\/span> <span class=\"token punctuation\">}<\/span><br \/>\n    <span class=\"token keyword\">public<\/span> <span class=\"token keyword\">void<\/span> <span class=\"token function\">writeData<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">String<\/span> data<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span> wrappee<span class=\"token punctuation\">.<\/span><span class=\"token function\">writeData<\/span><span class=\"token punctuation\">(<\/span>data<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span> <span class=\"token punctuation\">}<\/span><br \/>\n    <span class=\"token keyword\">public<\/span> <span class=\"token class-name\">String<\/span> <span class=\"token function\">readData<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span> <span class=\"token keyword\">return<\/span> wrappee<span class=\"token punctuation\">.<\/span><span class=\"token function\">readData<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span> <span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p><span class=\"token comment\">\/\/ \u5177\u4f53\u88c5\u9970\u5668&#xff1a;\u52a0\u5bc6<\/span><br \/>\n<span class=\"token keyword\">public<\/span> <span class=\"token keyword\">class<\/span> <span class=\"token class-name\">EncryptionDecorator<\/span> <span class=\"token keyword\">extends<\/span> <span class=\"token class-name\">DataSourceDecorator<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">public<\/span> <span class=\"token class-name\">EncryptionDecorator<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">DataSource<\/span> source<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span> <span class=\"token keyword\">super<\/span><span class=\"token punctuation\">(<\/span>source<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span> <span class=\"token punctuation\">}<\/span><\/p>\n<p>    <span class=\"token annotation punctuation\">&#064;Override<\/span><br \/>\n    <span class=\"token keyword\">public<\/span> <span class=\"token keyword\">void<\/span> <span class=\"token function\">writeData<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">String<\/span> data<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token keyword\">super<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">writeData<\/span><span class=\"token punctuation\">(<\/span><span class=\"token function\">encrypt<\/span><span class=\"token punctuation\">(<\/span>data<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>  <span class=\"token comment\">\/\/ \u589e\u5f3a\u540e\u518d\u5199\u5165<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><\/p>\n<p>    <span class=\"token keyword\">private<\/span> <span class=\"token class-name\">String<\/span> <span class=\"token function\">encrypt<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">String<\/span> data<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span> <span class=\"token keyword\">return<\/span> <span class=\"token string\">&#034;ENC(&#034;<\/span> <span class=\"token operator\">&#043;<\/span> data <span class=\"token operator\">&#043;<\/span> <span class=\"token string\">&#034;)&#034;<\/span><span class=\"token punctuation\">;<\/span> <span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p><span class=\"token comment\">\/\/ \u5ba2\u6237\u7aef&#xff1a;\u50cf\u5957\u5a03\u4e00\u6837\u81ea\u7531\u7ec4\u5408<\/span><br \/>\n<span class=\"token class-name\">DataSource<\/span> source <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">FileDataSource<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;data.txt&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\nsource <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">EncryptionDecorator<\/span><span class=\"token punctuation\">(<\/span>source<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>      <span class=\"token comment\">\/\/ \u52a0\u52a0\u5bc6<\/span><br \/>\nsource <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">CompressionDecorator<\/span><span class=\"token punctuation\">(<\/span>source<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>     <span class=\"token comment\">\/\/ \u518d\u52a0\u538b\u7f29<\/span><br \/>\nsource<span class=\"token punctuation\">.<\/span><span class=\"token function\">writeData<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;Hello&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<h5>12.3 \u88c5\u9970\u6a21\u5f0f\u5e94\u7528\u5b9e\u4f8b<\/h5>\n<ul>\n<li>Java I\/O\u6d41&#xff1a;new BufferedInputStream(new FileInputStream(&#034;a.txt&#034;))<\/li>\n<li>Web\u5f00\u53d1\u4e2d\u7684Filter\/Interceptor<\/li>\n<li>Spring\u4e2d\u7684BeanPostProcessor<\/li>\n<\/ul>\n<h5>12.4 \u900f\u660e\u88c5\u9970\u6a21\u5f0f\u4e0e\u534a\u900f\u660e\u88c5\u9970\u6a21\u5f0f<\/h5>\n<ul>\n<li>\u900f\u660e\u5f0f&#xff1a;\u88c5\u9970\u5668\u4e0e\u6784\u4ef6\u5b9e\u73b0\u540c\u4e00\u63a5\u53e3&#xff0c;\u53ef\u9012\u5f52\u88c5\u9970&#xff08;\u5982Java I\/O&#xff09;<\/li>\n<li>\u534a\u900f\u660e\u5f0f&#xff1a;\u88c5\u9970\u5668\u589e\u52a0\u65b0\u65b9\u6cd5&#xff0c;\u5ba2\u6237\u7aef\u9700\u77e5\u9053\u5177\u4f53\u88c5\u9970\u5668\u7c7b\u578b<\/li>\n<\/ul>\n<h5>12.5 \u88c5\u9970\u6a21\u5f0f\u4f18\u7f3a\u70b9\u4e0e\u9002\u7528\u73af\u5883<\/h5>\n<table>\n<tr>\u4f18\u70b9 \u2705\u7f3a\u70b9 \u274c<\/tr>\n<tbody>\n<tr>\n<td align=\"left\">\u6bd4\u7ee7\u627f\u66f4\u7075\u6d3b&#xff0c;\u52a8\u6001\u6269\u5c55<\/td>\n<td align=\"left\">\u4ea7\u751f\u5927\u91cf\u5c0f\u5bf9\u8c61<\/td>\n<\/tr>\n<tr>\n<td align=\"left\">\u53ef\u81ea\u7531\u7ec4\u5408\u591a\u4e2a\u88c5\u9970\u5668<\/td>\n<td align=\"left\">\u8c03\u8bd5\u56f0\u96be&#xff08;\u5c42\u5c42\u5d4c\u5957&#xff09;<\/td>\n<\/tr>\n<tr>\n<td align=\"left\">\u7b26\u5408OCP<\/td>\n<td align=\"left\">\u521d\u59cb\u5316\u4ee3\u7801\u590d\u6742<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<hr \/>\n<h4>\u7b2c13\u7ae0 \u5916\u89c2\u6a21\u5f0f<\/h4>\n<h5>13.1 \u5916\u89c2\u6a21\u5f0f\u6982\u8ff0<\/h5>\n<p>\u5916\u89c2\u6a21\u5f0f&#xff08;Facade Pattern&#xff09;\u4e3a\u5b50\u7cfb\u7edf\u4e2d\u7684\u4e00\u7ec4\u63a5\u53e3\u63d0\u4f9b\u4e00\u4e2a\u4e00\u81f4\u7684\u9ad8\u5c42\u754c\u9762&#xff0c;\u4f7f\u5f97\u5b50\u7cfb\u7edf\u66f4\u52a0\u5bb9\u6613\u4f7f\u7528\u3002<\/p>\n<p>&#x1f4a1; \u751f\u6d3b\u7c7b\u6bd4&#xff1a;\u9152\u5e97\u524d\u53f0&#xff08;\u4e00\u4e2a\u5165\u53e3\u641e\u5b9a\u4f4f\u5bbf\u3001\u9910\u996e\u3001\u4ea4\u901a&#xff09;<\/p>\n<h5>13.2 \u5916\u89c2\u6a21\u5f0f\u7ed3\u6784\u4e0e\u5b9e\u73b0<\/h5>\n<p><span class=\"token comment\">\/\/ \u5b50\u7cfb\u7edf\u7ec4\u4ef6<\/span><br \/>\n<span class=\"token keyword\">public<\/span> <span class=\"token keyword\">class<\/span> <span class=\"token class-name\">CPU<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">public<\/span> <span class=\"token keyword\">void<\/span> <span class=\"token function\">start<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span> <span class=\"token class-name\">System<\/span><span class=\"token punctuation\">.<\/span>out<span class=\"token punctuation\">.<\/span><span class=\"token function\">println<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;CPU\u542f\u52a8&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span> <span class=\"token punctuation\">}<\/span><br \/>\n    <span class=\"token keyword\">public<\/span> <span class=\"token keyword\">void<\/span> <span class=\"token function\">shutdown<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span> <span class=\"token class-name\">System<\/span><span class=\"token punctuation\">.<\/span>out<span class=\"token punctuation\">.<\/span><span class=\"token function\">println<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;CPU\u5173\u95ed&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span> <span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token keyword\">public<\/span> <span class=\"token keyword\">class<\/span> <span class=\"token class-name\">Memory<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">public<\/span> <span class=\"token keyword\">void<\/span> <span class=\"token function\">load<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span> <span class=\"token class-name\">System<\/span><span class=\"token punctuation\">.<\/span>out<span class=\"token punctuation\">.<\/span><span class=\"token function\">println<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;\u5185\u5b58\u52a0\u8f7d&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span> <span class=\"token punctuation\">}<\/span><br \/>\n    <span class=\"token keyword\">public<\/span> <span class=\"token keyword\">void<\/span> <span class=\"token function\">free<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span> <span class=\"token class-name\">System<\/span><span class=\"token punctuation\">.<\/span>out<span class=\"token punctuation\">.<\/span><span class=\"token function\">println<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;\u5185\u5b58\u91ca\u653e&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span> <span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token keyword\">public<\/span> <span class=\"token keyword\">class<\/span> <span class=\"token class-name\">HardDrive<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">public<\/span> <span class=\"token keyword\">void<\/span> <span class=\"token function\">read<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span> <span class=\"token class-name\">System<\/span><span class=\"token punctuation\">.<\/span>out<span class=\"token punctuation\">.<\/span><span class=\"token function\">println<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;\u786c\u76d8\u8bfb\u53d6&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span> <span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p><span class=\"token comment\">\/\/ \u5916\u89c2\u7c7b&#xff1a;\u4e00\u952e\u64cd\u4f5c<\/span><br \/>\n<span class=\"token keyword\">public<\/span> <span class=\"token keyword\">class<\/span> <span class=\"token class-name\">ComputerFacade<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">private<\/span> <span class=\"token class-name\">CPU<\/span> cpu <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">CPU<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">private<\/span> <span class=\"token class-name\">Memory<\/span> memory <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">Memory<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">private<\/span> <span class=\"token class-name\">HardDrive<\/span> hd <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">HardDrive<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token keyword\">public<\/span> <span class=\"token keyword\">void<\/span> <span class=\"token function\">start<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        cpu<span class=\"token punctuation\">.<\/span><span class=\"token function\">start<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        memory<span class=\"token punctuation\">.<\/span><span class=\"token function\">load<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        hd<span class=\"token punctuation\">.<\/span><span class=\"token function\">read<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token class-name\">System<\/span><span class=\"token punctuation\">.<\/span>out<span class=\"token punctuation\">.<\/span><span class=\"token function\">println<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;\u2705 \u7535\u8111\u542f\u52a8\u5b8c\u6210&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><\/p>\n<p>    <span class=\"token keyword\">public<\/span> <span class=\"token keyword\">void<\/span> <span class=\"token function\">shutdown<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        memory<span class=\"token punctuation\">.<\/span><span class=\"token function\">free<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        cpu<span class=\"token punctuation\">.<\/span><span class=\"token function\">shutdown<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token class-name\">System<\/span><span class=\"token punctuation\">.<\/span>out<span class=\"token punctuation\">.<\/span><span class=\"token function\">println<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;\u2705 \u7535\u8111\u5df2\u5173\u95ed&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p><span class=\"token comment\">\/\/ \u5ba2\u6237\u7aef&#xff1a;\u6781\u7b80\u8c03\u7528<\/span><br \/>\n<span class=\"token keyword\">new<\/span> <span class=\"token class-name\">ComputerFacade<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">start<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<h5>13.3 \u5916\u89c2\u6a21\u5f0f\u5e94\u7528\u5b9e\u4f8b<\/h5>\n<ul>\n<li>\u7f16\u8bd1\u5668&#xff08;\u5c06\u8bcd\u6cd5\u5206\u6790\u3001\u8bed\u6cd5\u5206\u6790\u3001\u8bed\u4e49\u5206\u6790\u3001\u4ee3\u7801\u751f\u6210\u5c01\u88c5\u4e3acompile()&#xff09;<\/li>\n<li>MVC\u4e2d\u7684Service\u5c42<\/li>\n<li>\u7535\u5546\u4e0b\u5355\u6d41\u7a0b&#xff08;\u5e93\u5b58\u3001\u652f\u4ed8\u3001\u7269\u6d41\u3001\u901a\u77e5&#xff09;<\/li>\n<\/ul>\n<h5>13.4 \u62bd\u8c61\u5916\u89c2\u7c7b<\/h5>\n<p>\u5f15\u5165\u62bd\u8c61\u5916\u89c2\u7c7b&#xff0c;\u652f\u6301\u66f4\u6362\u5177\u4f53\u5916\u89c2\u5b9e\u73b0&#xff0c;\u7b26\u5408OCP\u3002<\/p>\n<h5>13.5 \u5916\u89c2\u6a21\u5f0f\u4f18\u7f3a\u70b9\u4e0e\u9002\u7528\u73af\u5883<\/h5>\n<p>\u9002\u7528\u73af\u5883&#xff1a;\u4e3a\u590d\u6742\u5b50\u7cfb\u7edf\u63d0\u4f9b\u7b80\u5355\u63a5\u53e3&#xff1b;\u5ba2\u6237\u7a0b\u5e8f\u4e0e\u591a\u4e2a\u5b50\u7cfb\u7edf\u95f4\u5b58\u5728\u5f88\u5927\u4f9d\u8d56\u6027\u3002<\/p>\n<hr \/>\n<h4>\u7b2c14\u7ae0 \u4eab\u5143\u6a21\u5f0f<\/h4>\n<h5>14.1 \u4eab\u5143\u6a21\u5f0f\u6982\u8ff0<\/h5>\n<p>\u4eab\u5143\u6a21\u5f0f&#xff08;Flyweight Pattern&#xff09;\u8fd0\u7528\u5171\u4eab\u6280\u672f\u6709\u6548\u5730\u652f\u6301\u5927\u91cf\u7ec6\u7c92\u5ea6\u5bf9\u8c61\u7684\u590d\u7528\u3002\u901a\u8fc7\u5171\u4eab\u5df2\u5b58\u5728\u7684\u5bf9\u8c61\u6765\u51cf\u5c11\u5185\u5b58\u5f00\u9500\u3002<\/p>\n<h5>14.2 \u4eab\u5143\u6a21\u5f0f\u7ed3\u6784\u4e0e\u5b9e\u73b0<\/h5>\n<p><span class=\"token comment\">\/\/ \u62bd\u8c61\u4eab\u5143<\/span><br \/>\n<span class=\"token keyword\">public<\/span> <span class=\"token keyword\">abstract<\/span> <span class=\"token keyword\">class<\/span> <span class=\"token class-name\">ChessPiece<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">protected<\/span> <span class=\"token class-name\">String<\/span> color<span class=\"token punctuation\">;<\/span>  <span class=\"token comment\">\/\/ \u5185\u90e8\u72b6\u6001&#xff08;\u53ef\u5171\u4eab&#xff09;<\/span><\/p>\n<p>    <span class=\"token keyword\">public<\/span> <span class=\"token class-name\">ChessPiece<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">String<\/span> color<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span> <span class=\"token keyword\">this<\/span><span class=\"token punctuation\">.<\/span>color <span class=\"token operator\">&#061;<\/span> color<span class=\"token punctuation\">;<\/span> <span class=\"token punctuation\">}<\/span><br \/>\n    <span class=\"token keyword\">public<\/span> <span class=\"token keyword\">abstract<\/span> <span class=\"token keyword\">void<\/span> <span class=\"token function\">display<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">int<\/span> x<span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">int<\/span> y<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>  <span class=\"token comment\">\/\/ \u5916\u90e8\u72b6\u6001\u4f5c\u4e3a\u53c2\u6570\u4f20\u5165<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p><span class=\"token comment\">\/\/ \u5177\u4f53\u4eab\u5143<\/span><br \/>\n<span class=\"token keyword\">public<\/span> <span class=\"token keyword\">class<\/span> <span class=\"token class-name\">ConcreteChess<\/span> <span class=\"token keyword\">extends<\/span> <span class=\"token class-name\">ChessPiece<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">public<\/span> <span class=\"token class-name\">ConcreteChess<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">String<\/span> color<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span> <span class=\"token keyword\">super<\/span><span class=\"token punctuation\">(<\/span>color<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span> <span class=\"token punctuation\">}<\/span><\/p>\n<p>    <span class=\"token annotation punctuation\">&#064;Override<\/span><br \/>\n    <span class=\"token keyword\">public<\/span> <span class=\"token keyword\">void<\/span> <span class=\"token function\">display<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">int<\/span> x<span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">int<\/span> y<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token class-name\">System<\/span><span class=\"token punctuation\">.<\/span>out<span class=\"token punctuation\">.<\/span><span class=\"token function\">println<\/span><span class=\"token punctuation\">(<\/span>color <span class=\"token operator\">&#043;<\/span> <span class=\"token string\">&#034;\u68cb\u5b50&#xff0c;\u4f4d\u7f6e&#xff1a;(&#034;<\/span> <span class=\"token operator\">&#043;<\/span> x <span class=\"token operator\">&#043;<\/span> <span class=\"token string\">&#034;,&#034;<\/span> <span class=\"token operator\">&#043;<\/span> y <span class=\"token operator\">&#043;<\/span> <span class=\"token string\">&#034;)&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p><span class=\"token comment\">\/\/ \u4eab\u5143\u5de5\u5382&#xff08;\u6838\u5fc3&#xff1a;\u6c60\u5316\u7ba1\u7406&#xff09;<\/span><br \/>\n<span class=\"token keyword\">public<\/span> <span class=\"token keyword\">class<\/span> <span class=\"token class-name\">ChessFactory<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">private<\/span> <span class=\"token keyword\">static<\/span> <span class=\"token class-name\">Map<\/span><span class=\"token generics\"><span class=\"token punctuation\">&lt;<\/span><span class=\"token class-name\">String<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token class-name\">ChessPiece<\/span><span class=\"token punctuation\">&gt;<\/span><\/span> pool <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">HashMap<\/span><span class=\"token generics\"><span class=\"token punctuation\">&lt;<\/span><span class=\"token punctuation\">&gt;<\/span><\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token keyword\">public<\/span> <span class=\"token keyword\">static<\/span> <span class=\"token class-name\">ChessPiece<\/span> <span class=\"token function\">getPiece<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">String<\/span> color<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token keyword\">return<\/span> pool<span class=\"token punctuation\">.<\/span><span class=\"token function\">computeIfAbsent<\/span><span class=\"token punctuation\">(<\/span>color<span class=\"token punctuation\">,<\/span> <span class=\"token class-name\">ConcreteChess<\/span><span class=\"token operator\">::<\/span><span class=\"token keyword\">new<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<h5>14.3 \u4eab\u5143\u6a21\u5f0f\u5e94\u7528\u5b9e\u4f8b<\/h5>\n<ul>\n<li>\u56f4\u68cb\/\u8c61\u68cb\u68cb\u5b50&#xff08;\u989c\u8272\u5171\u4eab&#xff0c;\u4f4d\u7f6e\u4e0d\u540c&#xff09;<\/li>\n<li>\u6587\u672c\u7f16\u8f91\u5668\u4e2d\u7684\u5b57\u7b26\u5bf9\u8c61<\/li>\n<li>\u6570\u636e\u5e93\u8fde\u63a5\u6c60\u3001\u7ebf\u7a0b\u6c60<\/li>\n<\/ul>\n<h5>14.4 \u6709\u5916\u90e8\u72b6\u6001\u7684\u4eab\u5143\u6a21\u5f0f<\/h5>\n<ul>\n<li>\u5185\u90e8\u72b6\u6001&#xff08;Intrinsic State&#xff09;&#xff1a;\u53ef\u5171\u4eab&#xff0c;\u5b58\u50a8\u5728\u4eab\u5143\u5185\u90e8<\/li>\n<li>\u5916\u90e8\u72b6\u6001&#xff08;Extrinsic State&#xff09;&#xff1a;\u4e0d\u53ef\u5171\u4eab&#xff0c;\u7531\u5ba2\u6237\u7aef\u4f20\u5165<\/li>\n<\/ul>\n<h5>14.5 \u5355\u7eaf\u4eab\u5143\u6a21\u5f0f\u4e0e\u590d\u5408\u4eab\u5143\u6a21\u5f0f<\/h5>\n<ul>\n<li>\u5355\u7eaf\u4eab\u5143&#xff1a;\u6240\u6709\u4eab\u5143\u5bf9\u8c61\u90fd\u53ef\u5171\u4eab<\/li>\n<li>\u590d\u5408\u4eab\u5143&#xff1a;\u7531\u5355\u7eaf\u4eab\u5143\u7ec4\u5408\u800c\u6210&#xff0c;\u672c\u8eab\u4e0d\u53ef\u5171\u4eab<\/li>\n<\/ul>\n<h5>14.6 \u4eab\u5143\u6a21\u5f0f\u4e0eString\u7c7b<\/h5>\n<p>Java\u7684String\u5e38\u91cf\u6c60\u5c31\u662f\u4eab\u5143\u6a21\u5f0f\u7684\u5178\u578b\u5e94\u7528&#xff1a;<\/p>\n<p><span class=\"token class-name\">String<\/span> s1 <span class=\"token operator\">&#061;<\/span> <span class=\"token string\">&#034;hello&#034;<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token class-name\">String<\/span> s2 <span class=\"token operator\">&#061;<\/span> <span class=\"token string\">&#034;hello&#034;<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token class-name\">System<\/span><span class=\"token punctuation\">.<\/span>out<span class=\"token punctuation\">.<\/span><span class=\"token function\">println<\/span><span class=\"token punctuation\">(<\/span>s1 <span class=\"token operator\">&#061;&#061;<\/span> s2<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>  <span class=\"token comment\">\/\/ true&#xff01;\u5171\u4eab\u540c\u4e00\u5bf9\u8c61<\/span><\/p>\n<h5>14.7 \u4eab\u5143\u6a21\u5f0f\u4f18\u7f3a\u70b9\u4e0e\u9002\u7528\u73af\u5883<\/h5>\n<p>\u9002\u7528\u73af\u5883&#xff1a;\u7cfb\u7edf\u4e2d\u5b58\u5728\u5927\u91cf\u76f8\u4f3c\u5bf9\u8c61&#xff1b;\u9700\u8981\u7f13\u51b2\u6c60&#xff1b;\u5bf9\u8c61\u7684\u5927\u90e8\u5206\u72b6\u6001\u53ef\u4ee5\u5916\u90e8\u5316\u3002<\/p>\n<hr \/>\n<h4>\u7b2c15\u7ae0 \u4ee3\u7406\u6a21\u5f0f<\/h4>\n<h5>15.1 \u4ee3\u7406\u6a21\u5f0f\u6982\u8ff0<\/h5>\n<p>\u4ee3\u7406\u6a21\u5f0f&#xff08;Proxy Pattern&#xff09;\u7ed9\u67d0\u4e00\u4e2a\u5bf9\u8c61\u63d0\u4f9b\u4e00\u4e2a\u4ee3\u7406&#xff0c;\u5e76\u7531\u4ee3\u7406\u5bf9\u8c61\u63a7\u5236\u5bf9\u539f\u5bf9\u8c61\u7684\u5f15\u7528\u3002<\/p>\n<h5>15.2 \u4ee3\u7406\u6a21\u5f0f\u7ed3\u6784\u4e0e\u5b9e\u73b0<\/h5>\n<p><span class=\"token comment\">\/\/ \u62bd\u8c61\u4e3b\u9898<\/span><br \/>\n<span class=\"token keyword\">public<\/span> <span class=\"token keyword\">interface<\/span> <span class=\"token class-name\">Subject<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">void<\/span> <span class=\"token function\">request<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p><span class=\"token comment\">\/\/ \u771f\u5b9e\u4e3b\u9898<\/span><br \/>\n<span class=\"token keyword\">public<\/span> <span class=\"token keyword\">class<\/span> <span class=\"token class-name\">RealSubject<\/span> <span class=\"token keyword\">implements<\/span> <span class=\"token class-name\">Subject<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token annotation punctuation\">&#064;Override<\/span><br \/>\n    <span class=\"token keyword\">public<\/span> <span class=\"token keyword\">void<\/span> <span class=\"token function\">request<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token class-name\">System<\/span><span class=\"token punctuation\">.<\/span>out<span class=\"token punctuation\">.<\/span><span class=\"token function\">println<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;\u771f\u5b9e\u8bf7\u6c42\u5904\u7406&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p><span class=\"token comment\">\/\/ \u9759\u6001\u4ee3\u7406<\/span><br \/>\n<span class=\"token keyword\">public<\/span> <span class=\"token keyword\">class<\/span> <span class=\"token class-name\">Proxy<\/span> <span class=\"token keyword\">implements<\/span> <span class=\"token class-name\">Subject<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">private<\/span> <span class=\"token class-name\">RealSubject<\/span> realSubject<span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token annotation punctuation\">&#064;Override<\/span><br \/>\n    <span class=\"token keyword\">public<\/span> <span class=\"token keyword\">void<\/span> <span class=\"token function\">request<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token class-name\">System<\/span><span class=\"token punctuation\">.<\/span>out<span class=\"token punctuation\">.<\/span><span class=\"token function\">println<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;\u3010\u524d\u7f6e\u5904\u7406\u3011\u6743\u9650\u6821\u9a8c&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>realSubject <span class=\"token operator\">&#061;&#061;<\/span> <span class=\"token keyword\">null<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n            realSubject <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">RealSubject<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>  <span class=\"token comment\">\/\/ \u5ef6\u8fdf\u521b\u5efa<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span><br \/>\n        realSubject<span class=\"token punctuation\">.<\/span><span class=\"token function\">request<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token class-name\">System<\/span><span class=\"token punctuation\">.<\/span>out<span class=\"token punctuation\">.<\/span><span class=\"token function\">println<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;\u3010\u540e\u7f6e\u5904\u7406\u3011\u8bb0\u5f55\u65e5\u5fd7&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<h5>15.3 \u4ee3\u7406\u6a21\u5f0f\u5e94\u7528\u5b9e\u4f8b<\/h5>\n<ul>\n<li>Spring AOP&#xff08;\u9762\u5411\u5207\u9762\u7f16\u7a0b&#xff09;<\/li>\n<li>RPC\u8fdc\u7a0b\u8c03\u7528&#xff08;Dubbo\u3001gRPC&#xff09;<\/li>\n<li>MyBatis\u7684Mapper\u63a5\u53e3<\/li>\n<li>\u56fe\u7247\u61d2\u52a0\u8f7d<\/li>\n<\/ul>\n<h5>15.4 \u8fdc\u7a0b\u4ee3\u7406<\/h5>\n<p>\u4e3a\u4e0d\u540c\u5730\u5740\u7a7a\u95f4\u7684\u5bf9\u8c61\u63d0\u4f9b\u5c40\u90e8\u4ee3\u8868&#xff0c;\u5982RMI\u3001Dubbo\u3001gRPC\u3002<\/p>\n<h5>15.5 \u865a\u62df\u4ee3\u7406<\/h5>\n<p>\u5ef6\u8fdf\u521b\u5efa\u5f00\u9500\u5927\u7684\u5bf9\u8c61&#xff0c;\u5982\u5927\u56fe\u7247\u7684\u61d2\u52a0\u8f7d\u3001Hibernate\u7684\u5ef6\u8fdf\u52a0\u8f7d\u3002<\/p>\n<h5>15.6 \u52a8\u6001\u4ee3\u7406<\/h5>\n<p><span class=\"token comment\">\/\/ JDK\u52a8\u6001\u4ee3\u7406<\/span><br \/>\n<span class=\"token keyword\">public<\/span> <span class=\"token keyword\">class<\/span> <span class=\"token class-name\">DynamicProxyHandler<\/span> <span class=\"token keyword\">implements<\/span> <span class=\"token class-name\">InvocationHandler<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">private<\/span> <span class=\"token class-name\">Object<\/span> target<span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token keyword\">public<\/span> <span class=\"token class-name\">DynamicProxyHandler<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">Object<\/span> target<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token keyword\">this<\/span><span class=\"token punctuation\">.<\/span>target <span class=\"token operator\">&#061;<\/span> target<span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><\/p>\n<p>    <span class=\"token annotation punctuation\">&#064;Override<\/span><br \/>\n    <span class=\"token keyword\">public<\/span> <span class=\"token class-name\">Object<\/span> <span class=\"token function\">invoke<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">Object<\/span> proxy<span class=\"token punctuation\">,<\/span> <span class=\"token class-name\">Method<\/span> method<span class=\"token punctuation\">,<\/span> <span class=\"token class-name\">Object<\/span><span class=\"token punctuation\">[<\/span><span class=\"token punctuation\">]<\/span> args<span class=\"token punctuation\">)<\/span> <span class=\"token keyword\">throws<\/span> <span class=\"token class-name\">Throwable<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token class-name\">System<\/span><span class=\"token punctuation\">.<\/span>out<span class=\"token punctuation\">.<\/span><span class=\"token function\">println<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;\u3010Before\u3011&#034;<\/span> <span class=\"token operator\">&#043;<\/span> method<span class=\"token punctuation\">.<\/span><span class=\"token function\">getName<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token class-name\">Object<\/span> result <span class=\"token operator\">&#061;<\/span> method<span class=\"token punctuation\">.<\/span><span class=\"token function\">invoke<\/span><span class=\"token punctuation\">(<\/span>target<span class=\"token punctuation\">,<\/span> args<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token class-name\">System<\/span><span class=\"token punctuation\">.<\/span>out<span class=\"token punctuation\">.<\/span><span class=\"token function\">println<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;\u3010After\u3011&#034;<\/span> <span class=\"token operator\">&#043;<\/span> method<span class=\"token punctuation\">.<\/span><span class=\"token function\">getName<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">return<\/span> result<span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p><span class=\"token comment\">\/\/ \u521b\u5efa\u4ee3\u7406\u5b9e\u4f8b<\/span><br \/>\n<span class=\"token class-name\">Subject<\/span> proxy <span class=\"token operator\">&#061;<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token class-name\">Subject<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token class-name\">Proxy<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">newProxyInstance<\/span><span class=\"token punctuation\">(<\/span><br \/>\n    <span class=\"token class-name\">Subject<\/span><span class=\"token punctuation\">.<\/span><span class=\"token keyword\">class<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">getClassLoader<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">,<\/span><br \/>\n    <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">Class<\/span><span class=\"token punctuation\">[<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">{<\/span><span class=\"token class-name\">Subject<\/span><span class=\"token punctuation\">.<\/span><span class=\"token keyword\">class<\/span><span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">,<\/span><br \/>\n    <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">DynamicProxyHandler<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">new<\/span> <span class=\"token class-name\">RealSubject<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><br \/>\n<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\nproxy<span class=\"token punctuation\">.<\/span><span class=\"token function\">request<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<h5>15.7 \u4ee3\u7406\u6a21\u5f0f\u4f18\u7f3a\u70b9\u4e0e\u9002\u7528\u73af\u5883<\/h5>\n<table>\n<tr>\u4ee3\u7406\u7c7b\u578b\u5e94\u7528\u573a\u666f<\/tr>\n<tbody>\n<tr>\n<td align=\"center\">\u8fdc\u7a0b\u4ee3\u7406<\/td>\n<td align=\"left\">RPC\u3001\u5206\u5e03\u5f0f\u7cfb\u7edf<\/td>\n<\/tr>\n<tr>\n<td align=\"center\">\u865a\u62df\u4ee3\u7406<\/td>\n<td align=\"left\">\u5927\u5bf9\u8c61\u5ef6\u8fdf\u52a0\u8f7d<\/td>\n<\/tr>\n<tr>\n<td align=\"center\">\u4fdd\u62a4\u4ee3\u7406<\/td>\n<td align=\"left\">\u6743\u9650\u63a7\u5236<\/td>\n<\/tr>\n<tr>\n<td align=\"center\">\u7f13\u51b2\u4ee3\u7406<\/td>\n<td align=\"left\">\u7f13\u5b58&#xff08;\u5982Redis&#xff09;<\/td>\n<\/tr>\n<tr>\n<td align=\"center\">\u667a\u80fd\u5f15\u7528\u4ee3\u7406<\/td>\n<td align=\"left\">\u5f15\u7528\u8ba1\u6570\u3001COW<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<hr \/>\n<h3>\u7b2c\u56db\u90e8\u5206&#xff1a;\u884c\u4e3a\u578b\u8bbe\u8ba1\u6a21\u5f0f<\/h3>\n<p>&#x1f504; \u6838\u5fc3\u601d\u60f3&#xff1a;\u5173\u6ce8\u5bf9\u8c61\u4e4b\u95f4\u7684\u901a\u4fe1\u3001\u804c\u8d23\u5206\u914d\u548c\u7b97\u6cd5\u5c01\u88c5\u3002<\/p>\n<h4>\u7b2c16\u7ae0 \u804c\u8d23\u94fe\u6a21\u5f0f<\/h4>\n<h5>16.1 \u884c\u4e3a\u578b\u6a21\u5f0f\u6982\u8ff0<\/h5>\n<p>\u884c\u4e3a\u578b\u6a21\u5f0f\u5173\u6ce8\u5bf9\u8c61\u4e4b\u95f4\u7684\u901a\u4fe1\u548c\u804c\u8d23\u5206\u914d&#xff0c;\u517111\u79cd\u6a21\u5f0f\u3002<\/p>\n<h5>16.2 \u804c\u8d23\u94fe\u6a21\u5f0f\u6982\u8ff0<\/h5>\n<p>\u804c\u8d23\u94fe\u6a21\u5f0f&#xff08;Chain of Responsibility Pattern&#xff09;\u5c06\u8bf7\u6c42\u7684\u53d1\u9001\u8005\u548c\u63a5\u6536\u8005\u89e3\u8026&#xff0c;\u4f7f\u591a\u4e2a\u5bf9\u8c61\u90fd\u6709\u673a\u4f1a\u5904\u7406\u8bf7\u6c42&#xff0c;\u5c06\u8fd9\u4e9b\u5bf9\u8c61\u8fde\u6210\u4e00\u6761\u94fe\u3002<\/p>\n<h5>16.3 \u804c\u8d23\u94fe\u6a21\u5f0f\u7ed3\u6784\u4e0e\u5b9e\u73b0<\/h5>\n<p><span class=\"token comment\">\/\/ \u62bd\u8c61\u5904\u7406\u8005<\/span><br \/>\n<span class=\"token keyword\">public<\/span> <span class=\"token keyword\">abstract<\/span> <span class=\"token keyword\">class<\/span> <span class=\"token class-name\">Handler<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">protected<\/span> <span class=\"token class-name\">Handler<\/span> successor<span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token keyword\">public<\/span> <span class=\"token keyword\">void<\/span> <span class=\"token function\">setSuccessor<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">Handler<\/span> successor<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token keyword\">this<\/span><span class=\"token punctuation\">.<\/span>successor <span class=\"token operator\">&#061;<\/span> successor<span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><\/p>\n<p>    <span class=\"token keyword\">public<\/span> <span class=\"token keyword\">abstract<\/span> <span class=\"token keyword\">void<\/span> <span class=\"token function\">handleRequest<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">int<\/span> amount<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p><span class=\"token comment\">\/\/ \u5177\u4f53\u5904\u7406\u8005&#xff1a;\u7ecf\u7406&#xff08;\u22645000&#xff09;<\/span><br \/>\n<span class=\"token keyword\">public<\/span> <span class=\"token keyword\">class<\/span> <span class=\"token class-name\">Manager<\/span> <span class=\"token keyword\">extends<\/span> <span class=\"token class-name\">Handler<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token annotation punctuation\">&#064;Override<\/span><br \/>\n    <span class=\"token keyword\">public<\/span> <span class=\"token keyword\">void<\/span> <span class=\"token function\">handleRequest<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">int<\/span> amount<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>amount <span class=\"token operator\">&lt;&#061;<\/span> <span class=\"token number\">5000<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n            <span class=\"token class-name\">System<\/span><span class=\"token punctuation\">.<\/span>out<span class=\"token punctuation\">.<\/span><span class=\"token function\">println<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;\u7ecf\u7406\u5ba1\u6279\u901a\u8fc7&#xff1a;&#034;<\/span> <span class=\"token operator\">&#043;<\/span> amount <span class=\"token operator\">&#043;<\/span> <span class=\"token string\">&#034;\u5143&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span> <span class=\"token keyword\">else<\/span> <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>successor <span class=\"token operator\">!&#061;<\/span> <span class=\"token keyword\">null<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n            successor<span class=\"token punctuation\">.<\/span><span class=\"token function\">handleRequest<\/span><span class=\"token punctuation\">(<\/span>amount<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p><span class=\"token comment\">\/\/ \u5177\u4f53\u5904\u7406\u8005&#xff1a;\u603b\u76d1&#xff08;\u226450000&#xff09;<\/span><br \/>\n<span class=\"token keyword\">public<\/span> <span class=\"token keyword\">class<\/span> <span class=\"token class-name\">Director<\/span> <span class=\"token keyword\">extends<\/span> <span class=\"token class-name\">Handler<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token annotation punctuation\">&#064;Override<\/span><br \/>\n    <span class=\"token keyword\">public<\/span> <span class=\"token keyword\">void<\/span> <span class=\"token function\">handleRequest<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">int<\/span> amount<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>amount <span class=\"token operator\">&lt;&#061;<\/span> <span class=\"token number\">50000<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n            <span class=\"token class-name\">System<\/span><span class=\"token punctuation\">.<\/span>out<span class=\"token punctuation\">.<\/span><span class=\"token function\">println<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;\u603b\u76d1\u5ba1\u6279\u901a\u8fc7&#xff1a;&#034;<\/span> <span class=\"token operator\">&#043;<\/span> amount <span class=\"token operator\">&#043;<\/span> <span class=\"token string\">&#034;\u5143&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span> <span class=\"token keyword\">else<\/span> <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>successor <span class=\"token operator\">!&#061;<\/span> <span class=\"token keyword\">null<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n            successor<span class=\"token punctuation\">.<\/span><span class=\"token function\">handleRequest<\/span><span class=\"token punctuation\">(<\/span>amount<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p><span class=\"token comment\">\/\/ \u5177\u4f53\u5904\u7406\u8005&#xff1a;CEO&#xff08;\u65e0\u4e0a\u9650&#xff09;<\/span><br \/>\n<span class=\"token keyword\">public<\/span> <span class=\"token keyword\">class<\/span> <span class=\"token class-name\">CEO<\/span> <span class=\"token keyword\">extends<\/span> <span class=\"token class-name\">Handler<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token annotation punctuation\">&#064;Override<\/span><br \/>\n    <span class=\"token keyword\">public<\/span> <span class=\"token keyword\">void<\/span> <span class=\"token function\">handleRequest<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">int<\/span> amount<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token class-name\">System<\/span><span class=\"token punctuation\">.<\/span>out<span class=\"token punctuation\">.<\/span><span class=\"token function\">println<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;CEO\u5ba1\u6279\u901a\u8fc7&#xff1a;&#034;<\/span> <span class=\"token operator\">&#043;<\/span> amount <span class=\"token operator\">&#043;<\/span> <span class=\"token string\">&#034;\u5143&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p><span class=\"token comment\">\/\/ \u5ba2\u6237\u7aef&#xff1a;\u6784\u5efa\u94fe<\/span><br \/>\n<span class=\"token class-name\">Handler<\/span> manager <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">Manager<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token class-name\">Handler<\/span> director <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">Director<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token class-name\">Handler<\/span> ceo <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">CEO<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\nmanager<span class=\"token punctuation\">.<\/span><span class=\"token function\">setSuccessor<\/span><span class=\"token punctuation\">(<\/span>director<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\ndirector<span class=\"token punctuation\">.<\/span><span class=\"token function\">setSuccessor<\/span><span class=\"token punctuation\">(<\/span>ceo<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>manager<span class=\"token punctuation\">.<\/span><span class=\"token function\">handleRequest<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">3000<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>   <span class=\"token comment\">\/\/ \u7ecf\u7406\u5ba1\u6279<\/span><br \/>\nmanager<span class=\"token punctuation\">.<\/span><span class=\"token function\">handleRequest<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">30000<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>  <span class=\"token comment\">\/\/ \u603b\u76d1\u5ba1\u6279<\/span><br \/>\nmanager<span class=\"token punctuation\">.<\/span><span class=\"token function\">handleRequest<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">100000<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span> <span class=\"token comment\">\/\/ CEO\u5ba1\u6279<\/span><\/p>\n<h5>16.4 \u804c\u8d23\u94fe\u6a21\u5f0f\u5e94\u7528\u5b9e\u4f8b<\/h5>\n<ul>\n<li>\u5ba1\u6279\u6d41\u7a0b&#xff08;OA\u7cfb\u7edf&#xff09;<\/li>\n<li>Servlet Filter\u94fe<\/li>\n<li>Netty ChannelPipeline<\/li>\n<li>\u5f02\u5e38\u5904\u7406\u94fe&#xff08;try-catch&#xff09;<\/li>\n<li>Spring Security\u8fc7\u6ee4\u5668\u94fe<\/li>\n<\/ul>\n<h5>16.5 \u7eaf\u4e0e\u4e0d\u7eaf\u7684\u804c\u8d23\u94fe\u6a21\u5f0f<\/h5>\n<ul>\n<li>\u7eaf\u804c\u8d23\u94fe&#xff1a;\u8bf7\u6c42\u5fc5\u987b\u88ab\u67d0\u4e2a\u5904\u7406\u8005\u5904\u7406\u6216\u660e\u786e\u62d2\u7edd<\/li>\n<li>\u4e0d\u7eaf\u804c\u8d23\u94fe&#xff1a;\u8bf7\u6c42\u53ef\u4ee5\u88ab\u90e8\u5206\u5904\u7406&#xff0c;\u4e5f\u53ef\u4ee5\u4e0d\u88ab\u4efb\u4f55\u5904\u7406\u8005\u5904\u7406<\/li>\n<\/ul>\n<h5>16.6 \u804c\u8d23\u94fe\u6a21\u5f0f\u4f18\u7f3a\u70b9\u4e0e\u9002\u7528\u73af\u5883<\/h5>\n<p>\u9002\u7528\u73af\u5883&#xff1a;\u6709\u591a\u4e2a\u5bf9\u8c61\u53ef\u4ee5\u5904\u7406\u540c\u4e00\u8bf7\u6c42&#xff1b;\u9700\u8981\u52a8\u6001\u6307\u5b9a\u5904\u7406\u8005\u96c6\u5408\u3002<\/p>\n<hr \/>\n<h4>\u7b2c17\u7ae0 \u547d\u4ee4\u6a21\u5f0f<\/h4>\n<h5>17.1 \u547d\u4ee4\u6a21\u5f0f\u6982\u8ff0<\/h5>\n<p>\u547d\u4ee4\u6a21\u5f0f&#xff08;Command Pattern&#xff09;\u5c06\u4e00\u4e2a\u8bf7\u6c42\u5c01\u88c5\u4e3a\u4e00\u4e2a\u5bf9\u8c61&#xff0c;\u4ece\u800c\u53ef\u4ee5\u7528\u4e0d\u540c\u7684\u8bf7\u6c42\u5bf9\u5ba2\u6237\u8fdb\u884c\u53c2\u6570\u5316&#xff0c;\u652f\u6301\u8bf7\u6c42\u7684\u6392\u961f\u3001\u8bb0\u5f55\u65e5\u5fd7\u3001\u64a4\u9500\u64cd\u4f5c\u3002<\/p>\n<h5>17.2 \u547d\u4ee4\u6a21\u5f0f\u7ed3\u6784\u4e0e\u5b9e\u73b0<\/h5>\n<p><span class=\"token comment\">\/\/ \u63a5\u6536\u8005<\/span><br \/>\n<span class=\"token keyword\">public<\/span> <span class=\"token keyword\">class<\/span> <span class=\"token class-name\">Light<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">public<\/span> <span class=\"token keyword\">void<\/span> <span class=\"token function\">on<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span> <span class=\"token class-name\">System<\/span><span class=\"token punctuation\">.<\/span>out<span class=\"token punctuation\">.<\/span><span class=\"token function\">println<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;&#x1f4a1; \u706f\u4eae\u4e86&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span> <span class=\"token punctuation\">}<\/span><br \/>\n    <span class=\"token keyword\">public<\/span> <span class=\"token keyword\">void<\/span> <span class=\"token function\">off<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span> <span class=\"token class-name\">System<\/span><span class=\"token punctuation\">.<\/span>out<span class=\"token punctuation\">.<\/span><span class=\"token function\">println<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;&#x1f311; \u706f\u706d\u4e86&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span> <span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p><span class=\"token comment\">\/\/ \u62bd\u8c61\u547d\u4ee4<\/span><br \/>\n<span class=\"token keyword\">public<\/span> <span class=\"token keyword\">interface<\/span> <span class=\"token class-name\">Command<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">void<\/span> <span class=\"token function\">execute<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">void<\/span> <span class=\"token function\">undo<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p><span class=\"token comment\">\/\/ \u5177\u4f53\u547d\u4ee4<\/span><br \/>\n<span class=\"token keyword\">public<\/span> <span class=\"token keyword\">class<\/span> <span class=\"token class-name\">LightOnCommand<\/span> <span class=\"token keyword\">implements<\/span> <span class=\"token class-name\">Command<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">private<\/span> <span class=\"token class-name\">Light<\/span> light<span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">public<\/span> <span class=\"token class-name\">LightOnCommand<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">Light<\/span> light<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span> <span class=\"token keyword\">this<\/span><span class=\"token punctuation\">.<\/span>light <span class=\"token operator\">&#061;<\/span> light<span class=\"token punctuation\">;<\/span> <span class=\"token punctuation\">}<\/span><\/p>\n<p>    <span class=\"token keyword\">public<\/span> <span class=\"token keyword\">void<\/span> <span class=\"token function\">execute<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span> light<span class=\"token punctuation\">.<\/span><span class=\"token function\">on<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span> <span class=\"token punctuation\">}<\/span><br \/>\n    <span class=\"token keyword\">public<\/span> <span class=\"token keyword\">void<\/span> <span class=\"token function\">undo<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span> light<span class=\"token punctuation\">.<\/span><span class=\"token function\">off<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span> <span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p><span class=\"token comment\">\/\/ \u8c03\u7528\u8005&#xff08;\u9065\u63a7\u5668&#xff09;<\/span><br \/>\n<span class=\"token keyword\">public<\/span> <span class=\"token keyword\">class<\/span> <span class=\"token class-name\">RemoteControl<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">private<\/span> <span class=\"token class-name\">Command<\/span> command<span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">private<\/span> <span class=\"token class-name\">Stack<\/span><span class=\"token generics\"><span class=\"token punctuation\">&lt;<\/span><span class=\"token class-name\">Command<\/span><span class=\"token punctuation\">&gt;<\/span><\/span> history <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">Stack<\/span><span class=\"token generics\"><span class=\"token punctuation\">&lt;<\/span><span class=\"token punctuation\">&gt;<\/span><\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token keyword\">public<\/span> <span class=\"token keyword\">void<\/span> <span class=\"token function\">setCommand<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">Command<\/span> cmd<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span> <span class=\"token keyword\">this<\/span><span class=\"token punctuation\">.<\/span>command <span class=\"token operator\">&#061;<\/span> cmd<span class=\"token punctuation\">;<\/span> <span class=\"token punctuation\">}<\/span><\/p>\n<p>    <span class=\"token keyword\">public<\/span> <span class=\"token keyword\">void<\/span> <span class=\"token function\">pressButton<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        command<span class=\"token punctuation\">.<\/span><span class=\"token function\">execute<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        history<span class=\"token punctuation\">.<\/span><span class=\"token function\">push<\/span><span class=\"token punctuation\">(<\/span>command<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><\/p>\n<p>    <span class=\"token keyword\">public<\/span> <span class=\"token keyword\">void<\/span> <span class=\"token function\">pressUndo<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token operator\">!<\/span>history<span class=\"token punctuation\">.<\/span><span class=\"token function\">isEmpty<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n            history<span class=\"token punctuation\">.<\/span><span class=\"token function\">pop<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">undo<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<h5>17.3 \u547d\u4ee4\u6a21\u5f0f\u5e94\u7528\u5b9e\u4f8b<\/h5>\n<ul>\n<li>GUI\u6309\u94ae\u64cd\u4f5c<\/li>\n<li>\u6587\u672c\u7f16\u8f91\u5668\u7684\u64a4\u9500\/\u91cd\u505a&#xff08;Ctrl&#043;Z \/ Ctrl&#043;Y&#xff09;<\/li>\n<li>\u4efb\u52a1\u8c03\u5ea6\u7cfb\u7edf<\/li>\n<li>\u6570\u636e\u5e93\u4e8b\u52a1\u65e5\u5fd7<\/li>\n<\/ul>\n<h5>17.4 \u5b9e\u73b0\u547d\u4ee4\u961f\u5217<\/h5>\n<p>\u5c06\u547d\u4ee4\u5bf9\u8c61\u653e\u5165\u961f\u5217&#xff0c;\u5b9e\u73b0\u5f02\u6b65\u6267\u884c\u548c\u6279\u91cf\u5904\u7406\u3002<\/p>\n<h5>17.5 \u8bb0\u5f55\u8bf7\u6c42\u65e5\u5fd7<\/h5>\n<p>\u5c06\u6267\u884c\u8fc7\u7684\u547d\u4ee4\u5e8f\u5217\u5316\u5b58\u50a8&#xff0c;\u7cfb\u7edf\u5d29\u6e83\u540e\u53ef\u6062\u590d\u91cd\u653e\u3002<\/p>\n<h5>17.6 \u5b9e\u73b0\u64a4\u9500\u64cd\u4f5c<\/h5>\n<p>\u901a\u8fc7undo()\u65b9\u6cd5\u6216\u547d\u4ee4\u5386\u53f2\u6808\u5b9e\u73b0\u591a\u7ea7\u64a4\u9500\u3002<\/p>\n<h5>17.7 \u5b8f\u547d\u4ee4<\/h5>\n<p>\u7ec4\u5408\u591a\u4e2a\u547d\u4ee4\u4e3a\u4e00\u4e2a\u5b8f\u547d\u4ee4&#xff0c;\u4e00\u6b21\u6267\u884c\u591a\u4e2a\u64cd\u4f5c&#xff08;\u5982&#034;\u4e00\u952e\u4e0b\u73ed&#034;&#xff1a;\u5173\u706f&#043;\u5173\u7a7a\u8c03&#043;\u9501\u95e8&#xff09;\u3002<\/p>\n<h5>17.8 \u547d\u4ee4\u6a21\u5f0f\u4f18\u7f3a\u70b9\u4e0e\u9002\u7528\u73af\u5883<\/h5>\n<p>\u9002\u7528\u73af\u5883&#xff1a;\u9700\u8981\u5c06\u8bf7\u6c42\u8c03\u7528\u8005\u548c\u63a5\u6536\u8005\u89e3\u8026&#xff1b;\u9700\u8981\u652f\u6301\u64a4\u9500\u548c\u6062\u590d&#xff1b;\u9700\u8981\u652f\u6301\u4e8b\u52a1\u3002<\/p>\n<hr \/>\n<h4>\u7b2c18\u7ae0 \u89e3\u91ca\u5668\u6a21\u5f0f<\/h4>\n<h5>18.1 \u89e3\u91ca\u5668\u6a21\u5f0f\u6982\u8ff0<\/h5>\n<p>\u89e3\u91ca\u5668\u6a21\u5f0f&#xff08;Interpreter Pattern&#xff09;\u7ed9\u5b9a\u4e00\u4e2a\u8bed\u8a00&#xff0c;\u5b9a\u4e49\u5b83\u7684\u6587\u6cd5\u7684\u4e00\u79cd\u8868\u793a&#xff0c;\u5e76\u5b9a\u4e49\u4e00\u4e2a\u89e3\u91ca\u5668\u6765\u89e3\u91ca\u8be5\u8bed\u8a00\u4e2d\u7684\u53e5\u5b50\u3002<\/p>\n<h5>18.2 \u6587\u6cd5\u89c4\u5219\u548c\u62bd\u8c61\u8bed\u6cd5\u6811<\/h5>\n<p>\u901a\u8fc7\u6587\u6cd5\u89c4\u5219&#xff08;BNF&#xff09;\u63cf\u8ff0\u8bed\u8a00\u7ed3\u6784&#xff0c;\u6784\u5efa\u62bd\u8c61\u8bed\u6cd5\u6811&#xff08;AST&#xff09; \u8fdb\u884c\u89e3\u6790\u3002<\/p>\n<p>\u8868\u8fbe\u5f0f\u6587\u6cd5\u793a\u4f8b&#xff1a;<br \/>\nexpression ::&#061; term ((&#039;&#043;&#039; | &#039;-&#039;) term)*<br \/>\nterm       ::&#061; number<\/p>\n<h5>18.3 \u89e3\u91ca\u5668\u6a21\u5f0f\u7ed3\u6784\u4e0e\u5b9e\u73b0<\/h5>\n<p><span class=\"token comment\">\/\/ \u62bd\u8c61\u8868\u8fbe\u5f0f<\/span><br \/>\n<span class=\"token keyword\">public<\/span> <span class=\"token keyword\">abstract<\/span> <span class=\"token keyword\">class<\/span> <span class=\"token class-name\">Expression<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">public<\/span> <span class=\"token keyword\">abstract<\/span> <span class=\"token keyword\">int<\/span> <span class=\"token function\">interpret<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p><span class=\"token comment\">\/\/ \u7ec8\u7ed3\u7b26\u8868\u8fbe\u5f0f&#xff08;\u6570\u5b57&#xff09;<\/span><br \/>\n<span class=\"token keyword\">public<\/span> <span class=\"token keyword\">class<\/span> <span class=\"token class-name\">NumberExpression<\/span> <span class=\"token keyword\">extends<\/span> <span class=\"token class-name\">Expression<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">private<\/span> <span class=\"token keyword\">int<\/span> number<span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">public<\/span> <span class=\"token class-name\">NumberExpression<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">int<\/span> number<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span> <span class=\"token keyword\">this<\/span><span class=\"token punctuation\">.<\/span>number <span class=\"token operator\">&#061;<\/span> number<span class=\"token punctuation\">;<\/span> <span class=\"token punctuation\">}<\/span><br \/>\n    <span class=\"token keyword\">public<\/span> <span class=\"token keyword\">int<\/span> <span class=\"token function\">interpret<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span> <span class=\"token keyword\">return<\/span> number<span class=\"token punctuation\">;<\/span> <span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p><span class=\"token comment\">\/\/ \u975e\u7ec8\u7ed3\u7b26\u8868\u8fbe\u5f0f&#xff08;\u52a0\u6cd5&#xff09;<\/span><br \/>\n<span class=\"token keyword\">public<\/span> <span class=\"token keyword\">class<\/span> <span class=\"token class-name\">AddExpression<\/span> <span class=\"token keyword\">extends<\/span> <span class=\"token class-name\">Expression<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">private<\/span> <span class=\"token class-name\">Expression<\/span> left<span class=\"token punctuation\">,<\/span> right<span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token keyword\">public<\/span> <span class=\"token class-name\">AddExpression<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">Expression<\/span> left<span class=\"token punctuation\">,<\/span> <span class=\"token class-name\">Expression<\/span> right<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token keyword\">this<\/span><span class=\"token punctuation\">.<\/span>left <span class=\"token operator\">&#061;<\/span> left<span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">this<\/span><span class=\"token punctuation\">.<\/span>right <span class=\"token operator\">&#061;<\/span> right<span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><\/p>\n<p>    <span class=\"token keyword\">public<\/span> <span class=\"token keyword\">int<\/span> <span class=\"token function\">interpret<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token keyword\">return<\/span> left<span class=\"token punctuation\">.<\/span><span class=\"token function\">interpret<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token operator\">&#043;<\/span> right<span class=\"token punctuation\">.<\/span><span class=\"token function\">interpret<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p><span class=\"token comment\">\/\/ \u4f7f\u7528&#xff1a;\u89e3\u91ca 3 &#043; 5<\/span><br \/>\n<span class=\"token class-name\">Expression<\/span> expr <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">AddExpression<\/span><span class=\"token punctuation\">(<\/span><br \/>\n    <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">NumberExpression<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">3<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">,<\/span><br \/>\n    <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">NumberExpression<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">5<\/span><span class=\"token punctuation\">)<\/span><br \/>\n<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token class-name\">System<\/span><span class=\"token punctuation\">.<\/span>out<span class=\"token punctuation\">.<\/span><span class=\"token function\">println<\/span><span class=\"token punctuation\">(<\/span>expr<span class=\"token punctuation\">.<\/span><span class=\"token function\">interpret<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>  <span class=\"token comment\">\/\/ \u8f93\u51fa&#xff1a;8<\/span><\/p>\n<h5>18.4 \u89e3\u91ca\u5668\u6a21\u5f0f\u5e94\u7528\u5b9e\u4f8b<\/h5>\n<ul>\n<li>\u6b63\u5219\u8868\u8fbe\u5f0f\u5f15\u64ce<\/li>\n<li>SQL\u89e3\u6790\u5668<\/li>\n<li>\u6570\u5b66\u8868\u8fbe\u5f0f\u8ba1\u7b97\u5668<\/li>\n<li>\u7f16\u8bd1\u5668&#xff08;javac&#xff09;<\/li>\n<\/ul>\n<h5>18.5 \u89e3\u91ca\u5668\u6a21\u5f0f\u4f18\u7f3a\u70b9\u4e0e\u9002\u7528\u73af\u5883<\/h5>\n<table>\n<tr>\u4f18\u70b9 \u2705\u7f3a\u70b9 \u274c<\/tr>\n<tbody>\n<tr>\n<td align=\"left\">\u6613\u4e8e\u6269\u5c55\u6587\u6cd5\u89c4\u5219<\/td>\n<td align=\"left\">\u590d\u6742\u6587\u6cd5\u96be\u4ee5\u7ef4\u62a4<\/td>\n<\/tr>\n<tr>\n<td align=\"left\">\u6bcf\u6761\u6587\u6cd5\u89c4\u5219\u5bf9\u5e94\u4e00\u4e2a\u7c7b<\/td>\n<td align=\"left\">\u6267\u884c\u6548\u7387\u8f83\u4f4e<\/td>\n<\/tr>\n<tr>\n<td align=\"left\">\u5b9e\u73b0\u7b80\u5355<\/td>\n<td align=\"left\">\u5b9e\u9645\u5f00\u53d1\u4e2d\u4f7f\u7528\u6781\u5c11<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>\u9002\u7528\u73af\u5883&#xff1a;\u6587\u6cd5\u7b80\u5355\u3001\u6548\u7387\u4e0d\u662f\u5173\u952e\u95ee\u9898\u7684\u573a\u666f\u3002<\/p>\n<hr \/>\n<h4>\u7b2c19\u7ae0 \u8fed\u4ee3\u5668\u6a21\u5f0f<\/h4>\n<h5>19.1 \u8fed\u4ee3\u5668\u6a21\u5f0f\u6982\u8ff0<\/h5>\n<p>\u8fed\u4ee3\u5668\u6a21\u5f0f&#xff08;Iterator Pattern&#xff09;\u63d0\u4f9b\u4e00\u79cd\u65b9\u6cd5\u987a\u5e8f\u8bbf\u95ee\u4e00\u4e2a\u805a\u5408\u5bf9\u8c61\u4e2d\u7684\u5404\u4e2a\u5143\u7d20&#xff0c;\u800c\u53c8\u4e0d\u66b4\u9732\u8be5\u5bf9\u8c61\u7684\u5185\u90e8\u8868\u793a\u3002<\/p>\n<h5>19.2 \u8fed\u4ee3\u5668\u6a21\u5f0f\u7ed3\u6784\u4e0e\u5b9e\u73b0<\/h5>\n<p><span class=\"token comment\">\/\/ \u62bd\u8c61\u8fed\u4ee3\u5668<\/span><br \/>\n<span class=\"token keyword\">public<\/span> <span class=\"token keyword\">interface<\/span> <span class=\"token class-name\">Iterator<\/span><span class=\"token generics\"><span class=\"token punctuation\">&lt;<\/span><span class=\"token class-name\">T<\/span><span class=\"token punctuation\">&gt;<\/span><\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">boolean<\/span> <span class=\"token function\">hasNext<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token class-name\">T<\/span> <span class=\"token function\">next<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p><span class=\"token comment\">\/\/ \u5177\u4f53\u8fed\u4ee3\u5668<\/span><br \/>\n<span class=\"token keyword\">public<\/span> <span class=\"token keyword\">class<\/span> <span class=\"token class-name\">ConcreteIterator<\/span><span class=\"token generics\"><span class=\"token punctuation\">&lt;<\/span><span class=\"token class-name\">T<\/span><span class=\"token punctuation\">&gt;<\/span><\/span> <span class=\"token keyword\">implements<\/span> <span class=\"token class-name\">Iterator<\/span><span class=\"token generics\"><span class=\"token punctuation\">&lt;<\/span><span class=\"token class-name\">T<\/span><span class=\"token punctuation\">&gt;<\/span><\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">private<\/span> <span class=\"token class-name\">List<\/span><span class=\"token generics\"><span class=\"token punctuation\">&lt;<\/span><span class=\"token class-name\">T<\/span><span class=\"token punctuation\">&gt;<\/span><\/span> list<span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">private<\/span> <span class=\"token keyword\">int<\/span> index <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token keyword\">public<\/span> <span class=\"token class-name\">ConcreteIterator<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">List<\/span><span class=\"token generics\"><span class=\"token punctuation\">&lt;<\/span><span class=\"token class-name\">T<\/span><span class=\"token punctuation\">&gt;<\/span><\/span> list<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span> <span class=\"token keyword\">this<\/span><span class=\"token punctuation\">.<\/span>list <span class=\"token operator\">&#061;<\/span> list<span class=\"token punctuation\">;<\/span> <span class=\"token punctuation\">}<\/span><\/p>\n<p>    <span class=\"token keyword\">public<\/span> <span class=\"token keyword\">boolean<\/span> <span class=\"token function\">hasNext<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span> <span class=\"token keyword\">return<\/span> index <span class=\"token operator\">&lt;<\/span> list<span class=\"token punctuation\">.<\/span><span class=\"token function\">size<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span> <span class=\"token punctuation\">}<\/span><br \/>\n    <span class=\"token keyword\">public<\/span> <span class=\"token class-name\">T<\/span> <span class=\"token function\">next<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span> <span class=\"token keyword\">return<\/span> list<span class=\"token punctuation\">.<\/span><span class=\"token function\">get<\/span><span class=\"token punctuation\">(<\/span>index<span class=\"token operator\">&#043;&#043;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span> <span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p><span class=\"token comment\">\/\/ \u62bd\u8c61\u805a\u5408<\/span><br \/>\n<span class=\"token keyword\">public<\/span> <span class=\"token keyword\">interface<\/span> <span class=\"token class-name\">Aggregate<\/span><span class=\"token generics\"><span class=\"token punctuation\">&lt;<\/span><span class=\"token class-name\">T<\/span><span class=\"token punctuation\">&gt;<\/span><\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token class-name\">Iterator<\/span><span class=\"token generics\"><span class=\"token punctuation\">&lt;<\/span><span class=\"token class-name\">T<\/span><span class=\"token punctuation\">&gt;<\/span><\/span> <span class=\"token function\">createIterator<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<h5>19.3 \u8fed\u4ee3\u5668\u6a21\u5f0f\u5e94\u7528\u5b9e\u4f8b<\/h5>\n<ul>\n<li>\u96c6\u5408\u6846\u67b6\u904d\u5386<\/li>\n<li>\u6570\u636e\u5e93\u7ed3\u679c\u96c6\u904d\u5386<\/li>\n<li>\u6587\u4ef6\u7cfb\u7edf\u76ee\u5f55\u904d\u5386<\/li>\n<\/ul>\n<h5>19.4 \u4f7f\u7528\u5185\u90e8\u7c7b\u5b9e\u73b0\u8fed\u4ee3\u5668<\/h5>\n<p>Java\u4e2d\u5e38\u7528\u5185\u90e8\u7c7b\u5b9e\u73b0\u8fed\u4ee3\u5668&#xff0c;\u53ef\u4ee5\u8bbf\u95ee\u5916\u90e8\u7c7b\u7684\u79c1\u6709\u6210\u5458&#xff0c;\u540c\u65f6\u5bf9\u5916\u9690\u85cf\u5b9e\u73b0\u7ec6\u8282\u3002<\/p>\n<h5>19.5 Java\u5185\u7f6e\u8fed\u4ee3\u5668<\/h5>\n<p><span class=\"token comment\">\/\/ java.util.Iterator &#043; java.lang.Iterable<\/span><br \/>\n<span class=\"token class-name\">List<\/span><span class=\"token generics\"><span class=\"token punctuation\">&lt;<\/span><span class=\"token class-name\">String<\/span><span class=\"token punctuation\">&gt;<\/span><\/span> list <span class=\"token operator\">&#061;<\/span> <span class=\"token class-name\">Arrays<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">asList<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;A&#034;<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token string\">&#034;B&#034;<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token string\">&#034;C&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p><span class=\"token comment\">\/\/ \u65b9\u5f0f\u4e00&#xff1a;Iterator<\/span><br \/>\n<span class=\"token class-name\">Iterator<\/span><span class=\"token generics\"><span class=\"token punctuation\">&lt;<\/span><span class=\"token class-name\">String<\/span><span class=\"token punctuation\">&gt;<\/span><\/span> it <span class=\"token operator\">&#061;<\/span> list<span class=\"token punctuation\">.<\/span><span class=\"token function\">iterator<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">while<\/span> <span class=\"token punctuation\">(<\/span>it<span class=\"token punctuation\">.<\/span><span class=\"token function\">hasNext<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token class-name\">System<\/span><span class=\"token punctuation\">.<\/span>out<span class=\"token punctuation\">.<\/span><span class=\"token function\">println<\/span><span class=\"token punctuation\">(<\/span>it<span class=\"token punctuation\">.<\/span><span class=\"token function\">next<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p><span class=\"token comment\">\/\/ \u65b9\u5f0f\u4e8c&#xff1a;for-each&#xff08;\u8bed\u6cd5\u7cd6&#xff0c;\u5e95\u5c42\u5c31\u662fIterator&#xff09;<\/span><br \/>\n<span class=\"token keyword\">for<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token class-name\">String<\/span> s <span class=\"token operator\">:<\/span> list<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token class-name\">System<\/span><span class=\"token punctuation\">.<\/span>out<span class=\"token punctuation\">.<\/span><span class=\"token function\">println<\/span><span class=\"token punctuation\">(<\/span>s<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<h5>19.6 \u8fed\u4ee3\u5668\u6a21\u5f0f\u4f18\u7f3a\u70b9\u4e0e\u9002\u7528\u73af\u5883<\/h5>\n<p>\u9002\u7528\u73af\u5883&#xff1a;\u9700\u8981\u4e3a\u805a\u5408\u5bf9\u8c61\u63d0\u4f9b\u591a\u79cd\u904d\u5386\u65b9\u5f0f&#xff1b;\u9700\u8981\u4e3a\u4e0d\u540c\u7684\u805a\u5408\u7ed3\u6784\u63d0\u4f9b\u7edf\u4e00\u7684\u904d\u5386\u63a5\u53e3\u3002<\/p>\n<hr \/>\n<h4>\u7b2c20\u7ae0 \u4e2d\u4ecb\u8005\u6a21\u5f0f<\/h4>\n<h5>20.1 \u4e2d\u4ecb\u8005\u6a21\u5f0f\u6982\u8ff0<\/h5>\n<p>\u4e2d\u4ecb\u8005\u6a21\u5f0f&#xff08;Mediator Pattern&#xff09;\u7528\u4e00\u4e2a\u4e2d\u4ecb\u5bf9\u8c61\u6765\u5c01\u88c5\u4e00\u7cfb\u5217\u5bf9\u8c61\u7684\u4ea4\u4e92&#xff0c;\u4f7f\u5404\u5bf9\u8c61\u4e0d\u9700\u8981\u663e\u5f0f\u5730\u76f8\u4e92\u5f15\u7528&#xff0c;\u4ece\u800c\u677e\u8026\u5408\u3002<\/p>\n<p>&#x1f4a1; \u7c7b\u6bd4&#xff1a;\u673a\u573a\u8c03\u5ea6\u5854&#xff08;\u98de\u673a\u4e4b\u95f4\u4e0d\u76f4\u63a5\u901a\u4fe1&#xff0c;\u90fd\u901a\u8fc7\u5854\u53f0\u534f\u8c03&#xff09;<\/p>\n<h5>20.2 \u4e2d\u4ecb\u8005\u6a21\u5f0f\u7ed3\u6784\u4e0e\u5b9e\u73b0<\/h5>\n<p><span class=\"token comment\">\/\/ \u62bd\u8c61\u4e2d\u4ecb\u8005<\/span><br \/>\n<span class=\"token keyword\">public<\/span> <span class=\"token keyword\">abstract<\/span> <span class=\"token keyword\">class<\/span> <span class=\"token class-name\">Mediator<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">public<\/span> <span class=\"token keyword\">abstract<\/span> <span class=\"token keyword\">void<\/span> <span class=\"token function\">send<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">String<\/span> message<span class=\"token punctuation\">,<\/span> <span class=\"token class-name\">Colleague<\/span> colleague<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p><span class=\"token comment\">\/\/ \u5177\u4f53\u4e2d\u4ecb\u8005&#xff08;\u804a\u5929\u5ba4&#xff09;<\/span><br \/>\n<span class=\"token keyword\">public<\/span> <span class=\"token keyword\">class<\/span> <span class=\"token class-name\">ChatRoom<\/span> <span class=\"token keyword\">extends<\/span> <span class=\"token class-name\">Mediator<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">private<\/span> <span class=\"token class-name\">List<\/span><span class=\"token generics\"><span class=\"token punctuation\">&lt;<\/span><span class=\"token class-name\">Colleague<\/span><span class=\"token punctuation\">&gt;<\/span><\/span> colleagues <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">ArrayList<\/span><span class=\"token generics\"><span class=\"token punctuation\">&lt;<\/span><span class=\"token punctuation\">&gt;<\/span><\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token keyword\">public<\/span> <span class=\"token keyword\">void<\/span> <span class=\"token function\">register<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">Colleague<\/span> c<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span> colleagues<span class=\"token punctuation\">.<\/span><span class=\"token function\">add<\/span><span class=\"token punctuation\">(<\/span>c<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span> <span class=\"token punctuation\">}<\/span><\/p>\n<p>    <span class=\"token annotation punctuation\">&#064;Override<\/span><br \/>\n    <span class=\"token keyword\">public<\/span> <span class=\"token keyword\">void<\/span> <span class=\"token function\">send<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">String<\/span> message<span class=\"token punctuation\">,<\/span> <span class=\"token class-name\">Colleague<\/span> from<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token keyword\">for<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token class-name\">Colleague<\/span> c <span class=\"token operator\">:<\/span> colleagues<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n            <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>c <span class=\"token operator\">!&#061;<\/span> from<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n                c<span class=\"token punctuation\">.<\/span><span class=\"token function\">receive<\/span><span class=\"token punctuation\">(<\/span>message<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token punctuation\">}<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p><span class=\"token comment\">\/\/ \u540c\u4e8b\u7c7b<\/span><br \/>\n<span class=\"token keyword\">public<\/span> <span class=\"token keyword\">class<\/span> <span class=\"token class-name\">User<\/span> <span class=\"token keyword\">extends<\/span> <span class=\"token class-name\">Colleague<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">private<\/span> <span class=\"token class-name\">String<\/span> name<span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token keyword\">public<\/span> <span class=\"token class-name\">User<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">String<\/span> name<span class=\"token punctuation\">,<\/span> <span class=\"token class-name\">Mediator<\/span> mediator<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token keyword\">super<\/span><span class=\"token punctuation\">(<\/span>mediator<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">this<\/span><span class=\"token punctuation\">.<\/span>name <span class=\"token operator\">&#061;<\/span> name<span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><\/p>\n<p>    <span class=\"token keyword\">public<\/span> <span class=\"token keyword\">void<\/span> <span class=\"token function\">send<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">String<\/span> msg<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token class-name\">System<\/span><span class=\"token punctuation\">.<\/span>out<span class=\"token punctuation\">.<\/span><span class=\"token function\">println<\/span><span class=\"token punctuation\">(<\/span>name <span class=\"token operator\">&#043;<\/span> <span class=\"token string\">&#034; \u53d1\u9001&#xff1a;&#034;<\/span> <span class=\"token operator\">&#043;<\/span> msg<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        mediator<span class=\"token punctuation\">.<\/span><span class=\"token function\">send<\/span><span class=\"token punctuation\">(<\/span>msg<span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">this<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><\/p>\n<p>    <span class=\"token keyword\">public<\/span> <span class=\"token keyword\">void<\/span> <span class=\"token function\">receive<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">String<\/span> msg<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token class-name\">System<\/span><span class=\"token punctuation\">.<\/span>out<span class=\"token punctuation\">.<\/span><span class=\"token function\">println<\/span><span class=\"token punctuation\">(<\/span>name <span class=\"token operator\">&#043;<\/span> <span class=\"token string\">&#034; \u6536\u5230&#xff1a;&#034;<\/span> <span class=\"token operator\">&#043;<\/span> msg<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<h5>20.3 \u4e2d\u4ecb\u8005\u6a21\u5f0f\u5e94\u7528\u5b9e\u4f8b<\/h5>\n<ul>\n<li>\u804a\u5929\u5ba4<\/li>\n<li>MVC\u4e2d\u7684Controller<\/li>\n<li>\u673a\u573a\u8c03\u5ea6\u5854<\/li>\n<li>GUI\u4e2d\u5bf9\u8bdd\u6846\u534f\u8c03\u591a\u4e2a\u63a7\u4ef6<\/li>\n<\/ul>\n<h5>20.4 \u6269\u5c55\u4e2d\u4ecb\u8005\u4e0e\u540c\u4e8b\u7c7b<\/h5>\n<p>\u901a\u8fc7\u62bd\u8c61\u4e2d\u4ecb\u8005\u548c\u62bd\u8c61\u540c\u4e8b\u7c7b&#xff0c;\u652f\u6301\u65b0\u589e\u4ea4\u4e92\u65b9\u5f0f\u800c\u65e0\u9700\u4fee\u6539\u5df2\u6709\u4ee3\u7801\u3002<\/p>\n<h5>20.5 \u4e2d\u4ecb\u8005\u6a21\u5f0f\u4f18\u7f3a\u70b9\u4e0e\u9002\u7528\u73af\u5883<\/h5>\n<table>\n<tr>\u4f18\u70b9 \u2705\u7f3a\u70b9 \u274c<\/tr>\n<tbody>\n<tr>\n<td align=\"left\">\u964d\u4f4e\u540c\u4e8b\u7c7b\u95f4\u7684\u8026\u5408<\/td>\n<td align=\"left\">\u4e2d\u4ecb\u8005\u7c7b\u53ef\u80fd\u53d8\u5f97\u975e\u5e38\u590d\u6742<\/td>\n<\/tr>\n<tr>\n<td align=\"left\">\u4ea4\u4e92\u903b\u8f91\u96c6\u4e2d\u7ba1\u7406<\/td>\n<td align=\"left\">\u65b0\u589e\u540c\u4e8b\u7c7b\u9700\u4fee\u6539\u4e2d\u4ecb\u8005<\/td>\n<\/tr>\n<tr>\n<td align=\"left\">\u51cf\u5c11\u5b50\u7c7b\u751f\u6210<\/td>\n<td align=\"left\">\u8fc7\u5ea6\u96c6\u4e2d\u53ef\u80fd\u6210\u4e3a\u74f6\u9888<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<hr \/>\n<h4>\u7b2c21\u7ae0 \u5907\u5fd8\u5f55\u6a21\u5f0f<\/h4>\n<h5>21.1 \u5907\u5fd8\u5f55\u6a21\u5f0f\u6982\u8ff0<\/h5>\n<p>\u5907\u5fd8\u5f55\u6a21\u5f0f&#xff08;Memento Pattern&#xff09;\u5728\u4e0d\u7834\u574f\u5c01\u88c5\u6027\u7684\u524d\u63d0\u4e0b&#xff0c;\u6355\u83b7\u4e00\u4e2a\u5bf9\u8c61\u7684\u5185\u90e8\u72b6\u6001&#xff0c;\u5e76\u5728\u8be5\u5bf9\u8c61\u4e4b\u5916\u4fdd\u5b58\u8fd9\u4e2a\u72b6\u6001&#xff0c;\u4ee5\u4fbf\u4ee5\u540e\u6062\u590d\u3002<\/p>\n<h5>21.2 \u5907\u5fd8\u5f55\u6a21\u5f0f\u7ed3\u6784\u4e0e\u5b9e\u73b0<\/h5>\n<p><span class=\"token comment\">\/\/ \u5907\u5fd8\u5f55&#xff08;\u5b58\u50a8\u72b6\u6001&#xff09;<\/span><br \/>\n<span class=\"token keyword\">public<\/span> <span class=\"token keyword\">class<\/span> <span class=\"token class-name\">Memento<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">private<\/span> <span class=\"token keyword\">final<\/span> <span class=\"token class-name\">String<\/span> state<span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">public<\/span> <span class=\"token class-name\">Memento<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">String<\/span> state<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span> <span class=\"token keyword\">this<\/span><span class=\"token punctuation\">.<\/span>state <span class=\"token operator\">&#061;<\/span> state<span class=\"token punctuation\">;<\/span> <span class=\"token punctuation\">}<\/span><br \/>\n    <span class=\"token keyword\">public<\/span> <span class=\"token class-name\">String<\/span> <span class=\"token function\">getState<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span> <span class=\"token keyword\">return<\/span> state<span class=\"token punctuation\">;<\/span> <span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p><span class=\"token comment\">\/\/ \u539f\u53d1\u5668&#xff08;\u9700\u8981\u4fdd\u5b58\u72b6\u6001\u7684\u5bf9\u8c61&#xff09;<\/span><br \/>\n<span class=\"token keyword\">public<\/span> <span class=\"token keyword\">class<\/span> <span class=\"token class-name\">Originator<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">private<\/span> <span class=\"token class-name\">String<\/span> state<span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token keyword\">public<\/span> <span class=\"token keyword\">void<\/span> <span class=\"token function\">setState<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">String<\/span> state<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span> <span class=\"token keyword\">this<\/span><span class=\"token punctuation\">.<\/span>state <span class=\"token operator\">&#061;<\/span> state<span class=\"token punctuation\">;<\/span> <span class=\"token punctuation\">}<\/span><br \/>\n    <span class=\"token keyword\">public<\/span> <span class=\"token class-name\">String<\/span> <span class=\"token function\">getState<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span> <span class=\"token keyword\">return<\/span> state<span class=\"token punctuation\">;<\/span> <span class=\"token punctuation\">}<\/span><\/p>\n<p>    <span class=\"token keyword\">public<\/span> <span class=\"token class-name\">Memento<\/span> <span class=\"token function\">createMemento<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span> <span class=\"token keyword\">return<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">Memento<\/span><span class=\"token punctuation\">(<\/span>state<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span> <span class=\"token punctuation\">}<\/span><br \/>\n    <span class=\"token keyword\">public<\/span> <span class=\"token keyword\">void<\/span> <span class=\"token function\">restoreMemento<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">Memento<\/span> m<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span> <span class=\"token keyword\">this<\/span><span class=\"token punctuation\">.<\/span>state <span class=\"token operator\">&#061;<\/span> m<span class=\"token punctuation\">.<\/span><span class=\"token function\">getState<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span> <span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p><span class=\"token comment\">\/\/ \u7ba1\u7406\u8005&#xff08;\u4fdd\u5b58\u5907\u5fd8\u5f55\u5386\u53f2&#xff09;<\/span><br \/>\n<span class=\"token keyword\">public<\/span> <span class=\"token keyword\">class<\/span> <span class=\"token class-name\">Caretaker<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">private<\/span> <span class=\"token class-name\">Stack<\/span><span class=\"token generics\"><span class=\"token punctuation\">&lt;<\/span><span class=\"token class-name\">Memento<\/span><span class=\"token punctuation\">&gt;<\/span><\/span> history <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">Stack<\/span><span class=\"token generics\"><span class=\"token punctuation\">&lt;<\/span><span class=\"token punctuation\">&gt;<\/span><\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token keyword\">public<\/span> <span class=\"token keyword\">void<\/span> <span class=\"token function\">save<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">Memento<\/span> m<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span> history<span class=\"token punctuation\">.<\/span><span class=\"token function\">push<\/span><span class=\"token punctuation\">(<\/span>m<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span> <span class=\"token punctuation\">}<\/span><br \/>\n    <span class=\"token keyword\">public<\/span> <span class=\"token class-name\">Memento<\/span> <span class=\"token function\">undo<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span> <span class=\"token keyword\">return<\/span> history<span class=\"token punctuation\">.<\/span><span class=\"token function\">pop<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span> <span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p><span class=\"token comment\">\/\/ \u4f7f\u7528<\/span><br \/>\n<span class=\"token class-name\">Originator<\/span> editor <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">Originator<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token class-name\">Caretaker<\/span> caretaker <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">Caretaker<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>editor<span class=\"token punctuation\">.<\/span><span class=\"token function\">setState<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;\u7248\u672c1&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\ncaretaker<span class=\"token punctuation\">.<\/span><span class=\"token function\">save<\/span><span class=\"token punctuation\">(<\/span>editor<span class=\"token punctuation\">.<\/span><span class=\"token function\">createMemento<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>editor<span class=\"token punctuation\">.<\/span><span class=\"token function\">setState<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;\u7248\u672c2&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\ncaretaker<span class=\"token punctuation\">.<\/span><span class=\"token function\">save<\/span><span class=\"token punctuation\">(<\/span>editor<span class=\"token punctuation\">.<\/span><span class=\"token function\">createMemento<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>editor<span class=\"token punctuation\">.<\/span><span class=\"token function\">setState<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;\u7248\u672c3&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\neditor<span class=\"token punctuation\">.<\/span><span class=\"token function\">restoreMemento<\/span><span class=\"token punctuation\">(<\/span>caretaker<span class=\"token punctuation\">.<\/span><span class=\"token function\">undo<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>  <span class=\"token comment\">\/\/ \u6062\u590d\u5230\u7248\u672c2<\/span><\/p>\n<h5>21.3 \u5907\u5fd8\u5f55\u6a21\u5f0f\u5e94\u7528\u5b9e\u4f8b<\/h5>\n<ul>\n<li>\u6587\u672c\u7f16\u8f91\u5668\u7684 Ctrl&#043;Z<\/li>\n<li>\u6e38\u620f\u5b58\u6863\/\u8bfb\u6863<\/li>\n<li>\u6d4f\u89c8\u5668\u540e\u9000<\/li>\n<li>\u6570\u636e\u5e93\u4e8b\u52a1\u56de\u6eda<\/li>\n<\/ul>\n<h5>21.4 \u5b9e\u73b0\u591a\u6b21\u64a4\u9500<\/h5>\n<p>\u4f7f\u7528\u6808\u4fdd\u5b58\u591a\u4e2a\u5907\u5fd8\u5f55&#xff0c;\u652f\u6301\u591a\u7ea7\u64a4\u9500\u548c\u91cd\u505a&#xff08;\u53cc\u6808\u5b9e\u73b0&#xff09;\u3002<\/p>\n<h5>21.5 \u5907\u5fd8\u5f55\u6a21\u5f0f\u4f18\u7f3a\u70b9\u4e0e\u9002\u7528\u73af\u5883<\/h5>\n<p>\u9002\u7528\u73af\u5883&#xff1a;\u9700\u8981\u4fdd\u5b58\u548c\u6062\u590d\u5bf9\u8c61\u7684\u72b6\u6001&#xff1b;\u9700\u8981\u5b9e\u73b0\u64a4\u9500\u64cd\u4f5c&#xff1b;\u9700\u8981\u4e8b\u52a1\u56de\u6eda\u3002<\/p>\n<hr \/>\n<h4>\u7b2c22\u7ae0 \u89c2\u5bdf\u8005\u6a21\u5f0f<\/h4>\n<h5>22.1 \u89c2\u5bdf\u8005\u6a21\u5f0f\u6982\u8ff0<\/h5>\n<p>\u89c2\u5bdf\u8005\u6a21\u5f0f&#xff08;Observer Pattern&#xff09;\u5b9a\u4e49\u5bf9\u8c61\u95f4\u7684\u4e00\u79cd\u4e00\u5bf9\u591a\u4f9d\u8d56\u5173\u7cfb&#xff0c;\u5f53\u4e00\u4e2a\u5bf9\u8c61\u72b6\u6001\u6539\u53d8\u65f6&#xff0c;\u6240\u6709\u4f9d\u8d56\u4e8e\u5b83\u7684\u5bf9\u8c61\u90fd\u5f97\u5230\u901a\u77e5\u5e76\u81ea\u52a8\u66f4\u65b0\u3002\u53c8\u79f0\u53d1\u5e03-\u8ba2\u9605\u6a21\u5f0f\u3002<\/p>\n<h5>22.2 \u89c2\u5bdf\u8005\u6a21\u5f0f\u7ed3\u6784\u4e0e\u5b9e\u73b0<\/h5>\n<p><span class=\"token comment\">\/\/ \u62bd\u8c61\u4e3b\u9898&#xff08;\u88ab\u89c2\u5bdf\u8005&#xff09;<\/span><br \/>\n<span class=\"token keyword\">public<\/span> <span class=\"token keyword\">interface<\/span> <span class=\"token class-name\">Subject<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">void<\/span> <span class=\"token function\">register<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">Observer<\/span> o<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">void<\/span> <span class=\"token function\">unregister<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">Observer<\/span> o<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">void<\/span> <span class=\"token function\">notifyObservers<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p><span class=\"token comment\">\/\/ \u62bd\u8c61\u89c2\u5bdf\u8005<\/span><br \/>\n<span class=\"token keyword\">public<\/span> <span class=\"token keyword\">interface<\/span> <span class=\"token class-name\">Observer<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">void<\/span> <span class=\"token function\">update<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">String<\/span> message<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p><span class=\"token comment\">\/\/ \u5177\u4f53\u4e3b\u9898<\/span><br \/>\n<span class=\"token keyword\">public<\/span> <span class=\"token keyword\">class<\/span> <span class=\"token class-name\">NewsAgency<\/span> <span class=\"token keyword\">implements<\/span> <span class=\"token class-name\">Subject<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">private<\/span> <span class=\"token class-name\">List<\/span><span class=\"token generics\"><span class=\"token punctuation\">&lt;<\/span><span class=\"token class-name\">Observer<\/span><span class=\"token punctuation\">&gt;<\/span><\/span> observers <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">ArrayList<\/span><span class=\"token generics\"><span class=\"token punctuation\">&lt;<\/span><span class=\"token punctuation\">&gt;<\/span><\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">private<\/span> <span class=\"token class-name\">String<\/span> news<span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token keyword\">public<\/span> <span class=\"token keyword\">void<\/span> <span class=\"token function\">setNews<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">String<\/span> news<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token keyword\">this<\/span><span class=\"token punctuation\">.<\/span>news <span class=\"token operator\">&#061;<\/span> news<span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token function\">notifyObservers<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>  <span class=\"token comment\">\/\/ \u72b6\u6001\u53d8\u5316&#xff0c;\u81ea\u52a8\u901a\u77e5<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><\/p>\n<p>    <span class=\"token annotation punctuation\">&#064;Override<\/span><br \/>\n    <span class=\"token keyword\">public<\/span> <span class=\"token keyword\">void<\/span> <span class=\"token function\">register<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">Observer<\/span> o<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span> observers<span class=\"token punctuation\">.<\/span><span class=\"token function\">add<\/span><span class=\"token punctuation\">(<\/span>o<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span> <span class=\"token punctuation\">}<\/span><\/p>\n<p>    <span class=\"token annotation punctuation\">&#064;Override<\/span><br \/>\n    <span class=\"token keyword\">public<\/span> <span class=\"token keyword\">void<\/span> <span class=\"token function\">unregister<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">Observer<\/span> o<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span> observers<span class=\"token punctuation\">.<\/span><span class=\"token function\">remove<\/span><span class=\"token punctuation\">(<\/span>o<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span> <span class=\"token punctuation\">}<\/span><\/p>\n<p>    <span class=\"token annotation punctuation\">&#064;Override<\/span><br \/>\n    <span class=\"token keyword\">public<\/span> <span class=\"token keyword\">void<\/span> <span class=\"token function\">notifyObservers<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        observers<span class=\"token punctuation\">.<\/span><span class=\"token function\">forEach<\/span><span class=\"token punctuation\">(<\/span>o <span class=\"token operator\">-&gt;<\/span> o<span class=\"token punctuation\">.<\/span><span class=\"token function\">update<\/span><span class=\"token punctuation\">(<\/span>news<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p><span class=\"token comment\">\/\/ \u5177\u4f53\u89c2\u5bdf\u8005<\/span><br \/>\n<span class=\"token keyword\">public<\/span> <span class=\"token keyword\">class<\/span> <span class=\"token class-name\">NewsChannel<\/span> <span class=\"token keyword\">implements<\/span> <span class=\"token class-name\">Observer<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">private<\/span> <span class=\"token class-name\">String<\/span> name<span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">public<\/span> <span class=\"token class-name\">NewsChannel<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">String<\/span> name<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span> <span class=\"token keyword\">this<\/span><span class=\"token punctuation\">.<\/span>name <span class=\"token operator\">&#061;<\/span> name<span class=\"token punctuation\">;<\/span> <span class=\"token punctuation\">}<\/span><\/p>\n<p>    <span class=\"token annotation punctuation\">&#064;Override<\/span><br \/>\n    <span class=\"token keyword\">public<\/span> <span class=\"token keyword\">void<\/span> <span class=\"token function\">update<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">String<\/span> message<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token class-name\">System<\/span><span class=\"token punctuation\">.<\/span>out<span class=\"token punctuation\">.<\/span><span class=\"token function\">println<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;[&#034;<\/span> <span class=\"token operator\">&#043;<\/span> name <span class=\"token operator\">&#043;<\/span> <span class=\"token string\">&#034;] \u6536\u5230\u65b0\u95fb&#xff1a;&#034;<\/span> <span class=\"token operator\">&#043;<\/span> message<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<h5>22.3 \u89c2\u5bdf\u8005\u6a21\u5f0f\u5e94\u7528\u5b9e\u4f8b<\/h5>\n<ul>\n<li>\u4e8b\u4ef6\u76d1\u542c\u673a\u5236<\/li>\n<li>\u6d88\u606f\u961f\u5217&#xff08;Kafka\u3001RabbitMQ&#xff09;<\/li>\n<li>\u793e\u4ea4\u5a92\u4f53\u7684\u5173\u6ce8\/\u7c89\u4e1d<\/li>\n<li>\u80a1\u7968\u4ef7\u683c\u901a\u77e5<\/li>\n<\/ul>\n<h5>22.4 JDK\u5bf9\u89c2\u5bdf\u8005\u6a21\u5f0f\u7684\u652f\u6301<\/h5>\n<ul>\n<li>java.util.Observable \/ java.util.Observer&#xff08;Java 9\u5df2\u5e9f\u5f03&#xff09;<\/li>\n<li>Java 9&#043; \u63a8\u8350\u4f7f\u7528 java.util.concurrent.Flow&#xff08;Publisher \/ Subscriber&#xff09;<\/li>\n<li>PropertyChangeListener \/ PropertyChangeSupport<\/li>\n<\/ul>\n<h5>22.5 \u89c2\u5bdf\u8005\u6a21\u5f0f\u4e0eJava\u4e8b\u4ef6\u5904\u7406<\/h5>\n<p>AWT\/Swing\u7684\u4e8b\u4ef6\u59d4\u6258\u6a21\u578b\u5c31\u662f\u89c2\u5bdf\u8005\u6a21\u5f0f&#xff1a;<\/p>\n<p>\u4e8b\u4ef6\u6e90&#xff08;Button&#xff09; \u2192 \u4e8b\u4ef6\u5bf9\u8c61&#xff08;ActionEvent&#xff09; \u2192 \u4e8b\u4ef6\u76d1\u542c\u5668&#xff08;ActionListener&#xff09;<\/p>\n<h5>22.6 \u89c2\u5bdf\u8005\u6a21\u5f0f\u4e0eMVC<\/h5>\n<p>\u5728MVC\u67b6\u6784\u4e2d&#xff1a;<\/p>\n<ul>\n<li>Model &#061; \u88ab\u89c2\u5bdf\u8005<\/li>\n<li>View &#061; \u89c2\u5bdf\u8005<\/li>\n<li>Model\u53d8\u5316\u65f6View\u81ea\u52a8\u66f4\u65b0&#xff0c;\u5b9e\u73b0\u6570\u636e\u4e0e\u5c55\u793a\u7684\u89e3\u8026<\/li>\n<\/ul>\n<h5>22.7 \u89c2\u5bdf\u8005\u6a21\u5f0f\u4f18\u7f3a\u70b9\u4e0e\u9002\u7528\u73af\u5883<\/h5>\n<table>\n<tr>\u4f18\u70b9 \u2705\u7f3a\u70b9 \u274c<\/tr>\n<tbody>\n<tr>\n<td align=\"left\">\u4e3b\u9898\u4e0e\u89c2\u5bdf\u8005\u677e\u8026\u5408<\/td>\n<td align=\"left\">\u89c2\u5bdf\u8005\u8fc7\u591a\u65f6\u901a\u77e5\u5f00\u9500\u5927<\/td>\n<\/tr>\n<tr>\n<td align=\"left\">\u652f\u6301\u5e7f\u64ad\u901a\u4fe1<\/td>\n<td align=\"left\">\u53ef\u80fd\u5f15\u8d77\u5faa\u73af\u4f9d\u8d56<\/td>\n<\/tr>\n<tr>\n<td align=\"left\">\u7b26\u5408OCP<\/td>\n<td align=\"left\">\u901a\u77e5\u987a\u5e8f\u4e0d\u53ef\u63a7<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<hr \/>\n<h4>\u7b2c23\u7ae0 \u72b6\u6001\u6a21\u5f0f<\/h4>\n<h5>23.1 \u72b6\u6001\u6a21\u5f0f\u6982\u8ff0<\/h5>\n<p>\u72b6\u6001\u6a21\u5f0f&#xff08;State Pattern&#xff09;\u5141\u8bb8\u4e00\u4e2a\u5bf9\u8c61\u5728\u5176\u5185\u90e8\u72b6\u6001\u6539\u53d8\u65f6\u6539\u53d8\u5b83\u7684\u884c\u4e3a&#xff0c;\u5bf9\u8c61\u770b\u8d77\u6765\u4f3c\u4e4e\u4fee\u6539\u4e86\u5b83\u7684\u7c7b\u3002<\/p>\n<h5>23.2 \u72b6\u6001\u6a21\u5f0f\u7ed3\u6784\u4e0e\u5b9e\u73b0<\/h5>\n<p><span class=\"token comment\">\/\/ \u62bd\u8c61\u72b6\u6001<\/span><br \/>\n<span class=\"token keyword\">public<\/span> <span class=\"token keyword\">abstract<\/span> <span class=\"token keyword\">class<\/span> <span class=\"token class-name\">TrafficState<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">protected<\/span> <span class=\"token class-name\">TrafficLight<\/span> context<span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">public<\/span> <span class=\"token keyword\">abstract<\/span> <span class=\"token keyword\">void<\/span> <span class=\"token function\">handle<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p><span class=\"token comment\">\/\/ \u5177\u4f53\u72b6\u6001<\/span><br \/>\n<span class=\"token keyword\">public<\/span> <span class=\"token keyword\">class<\/span> <span class=\"token class-name\">GreenState<\/span> <span class=\"token keyword\">extends<\/span> <span class=\"token class-name\">TrafficState<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token annotation punctuation\">&#064;Override<\/span><br \/>\n    <span class=\"token keyword\">public<\/span> <span class=\"token keyword\">void<\/span> <span class=\"token function\">handle<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token class-name\">System<\/span><span class=\"token punctuation\">.<\/span>out<span class=\"token punctuation\">.<\/span><span class=\"token function\">println<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;&#x1f7e2; \u7eff\u706f&#xff1a;\u901a\u884c&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        context<span class=\"token punctuation\">.<\/span><span class=\"token function\">setState<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">new<\/span> <span class=\"token class-name\">YellowState<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p><span class=\"token keyword\">public<\/span> <span class=\"token keyword\">class<\/span> <span class=\"token class-name\">YellowState<\/span> <span class=\"token keyword\">extends<\/span> <span class=\"token class-name\">TrafficState<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token annotation punctuation\">&#064;Override<\/span><br \/>\n    <span class=\"token keyword\">public<\/span> <span class=\"token keyword\">void<\/span> <span class=\"token function\">handle<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token class-name\">System<\/span><span class=\"token punctuation\">.<\/span>out<span class=\"token punctuation\">.<\/span><span class=\"token function\">println<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;&#x1f7e1; \u9ec4\u706f&#xff1a;\u51cf\u901f&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        context<span class=\"token punctuation\">.<\/span><span class=\"token function\">setState<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">new<\/span> <span class=\"token class-name\">RedState<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p><span class=\"token keyword\">public<\/span> <span class=\"token keyword\">class<\/span> <span class=\"token class-name\">RedState<\/span> <span class=\"token keyword\">extends<\/span> <span class=\"token class-name\">TrafficState<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token annotation punctuation\">&#064;Override<\/span><br \/>\n    <span class=\"token keyword\">public<\/span> <span class=\"token keyword\">void<\/span> <span class=\"token function\">handle<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token class-name\">System<\/span><span class=\"token punctuation\">.<\/span>out<span class=\"token punctuation\">.<\/span><span class=\"token function\">println<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;&#x1f534; \u7ea2\u706f&#xff1a;\u505c\u6b62&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        context<span class=\"token punctuation\">.<\/span><span class=\"token function\">setState<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">new<\/span> <span class=\"token class-name\">GreenState<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p><span class=\"token comment\">\/\/ \u73af\u5883\u7c7b&#xff08;\u7ea2\u7eff\u706f&#xff09;<\/span><br \/>\n<span class=\"token keyword\">public<\/span> <span class=\"token keyword\">class<\/span> <span class=\"token class-name\">TrafficLight<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">private<\/span> <span class=\"token class-name\">TrafficState<\/span> state<span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token keyword\">public<\/span> <span class=\"token class-name\">TrafficLight<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span> <span class=\"token keyword\">this<\/span><span class=\"token punctuation\">.<\/span>state <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">RedState<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span> <span class=\"token punctuation\">}<\/span><br \/>\n    <span class=\"token keyword\">public<\/span> <span class=\"token keyword\">void<\/span> <span class=\"token function\">setState<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">TrafficState<\/span> state<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token keyword\">this<\/span><span class=\"token punctuation\">.<\/span>state <span class=\"token operator\">&#061;<\/span> state<span class=\"token punctuation\">;<\/span><br \/>\n        state<span class=\"token punctuation\">.<\/span>context <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">this<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n    <span class=\"token keyword\">public<\/span> <span class=\"token keyword\">void<\/span> <span class=\"token function\">change<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span> state<span class=\"token punctuation\">.<\/span><span class=\"token function\">handle<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span> <span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<h5>23.3 \u72b6\u6001\u6a21\u5f0f\u5e94\u7528\u5b9e\u4f8b<\/h5>\n<ul>\n<li>TCP\u8fde\u63a5\u72b6\u6001&#xff08;ESTABLISHED\u3001LISTEN\u3001CLOSED&#xff09;<\/li>\n<li>\u7ebf\u7a0b\u72b6\u6001&#xff08;NEW\u3001RUNNABLE\u3001BLOCKED\u3001TERMINATED&#xff09;<\/li>\n<li>\u8ba2\u5355\u72b6\u6001\u6d41\u8f6c&#xff08;\u5f85\u4ed8\u6b3e\u2192\u5df2\u4ed8\u6b3e\u2192\u5df2\u53d1\u8d27\u2192\u5df2\u5b8c\u6210&#xff09;<\/li>\n<li>\u7535\u68af\u8fd0\u884c\u72b6\u6001<\/li>\n<\/ul>\n<h5>23.4 \u5171\u4eab\u72b6\u6001<\/h5>\n<p>\u5982\u679c\u72b6\u6001\u5bf9\u8c61\u6ca1\u6709\u5185\u90e8\u72b6\u6001&#xff08;\u65e0\u72b6\u6001&#xff09;&#xff0c;\u53ef\u4ee5\u88ab\u591a\u4e2aContext\u5171\u4eab&#xff08;\u7c7b\u4f3c\u4eab\u5143\u6a21\u5f0f&#xff09;\u3002<\/p>\n<h5>23.5 \u4f7f\u7528\u73af\u5883\u7c7b\u5b9e\u73b0\u72b6\u6001\u8f6c\u6362<\/h5>\n<p>\u72b6\u6001\u8f6c\u6362\u903b\u8f91\u53ef\u4ee5&#xff1a;<\/p>\n<ul>\n<li>\u653e\u5728\u72b6\u6001\u7c7b\u4e2d&#xff08;\u5206\u6563&#xff0c;\u5404\u72b6\u6001\u81ea\u6cbb&#xff09;<\/li>\n<li>\u96c6\u4e2d\u5728\u73af\u5883\u7c7b\u4e2d&#xff08;\u96c6\u4e2d&#xff0c;\u6613\u4e8e\u7ba1\u7406&#xff09;<\/li>\n<\/ul>\n<h5>23.6 \u72b6\u6001\u6a21\u5f0f\u4f18\u7f3a\u70b9\u4e0e\u9002\u7528\u73af\u5883<\/h5>\n<p>\u9002\u7528\u73af\u5883&#xff1a;\u5bf9\u8c61\u884c\u4e3a\u53d6\u51b3\u4e8e\u72b6\u6001&#xff0c;\u8fd0\u884c\u65f6\u6839\u636e\u72b6\u6001\u6539\u53d8\u884c\u4e3a&#xff1b;\u4ee3\u7801\u4e2d\u5305\u542b\u5927\u91cf\u4e0e\u72b6\u6001\u6709\u5173\u7684\u6761\u4ef6\u8bed\u53e5&#xff08;if-else\/switch&#xff09;\u3002<\/p>\n<hr \/>\n<h4>\u7b2c24\u7ae0 \u7b56\u7565\u6a21\u5f0f<\/h4>\n<h5>24.1 \u7b56\u7565\u6a21\u5f0f\u6982\u8ff0<\/h5>\n<p>\u7b56\u7565\u6a21\u5f0f&#xff08;Strategy Pattern&#xff09;\u5b9a\u4e49\u4e00\u7cfb\u5217\u7b97\u6cd5&#xff0c;\u5c06\u6bcf\u4e00\u4e2a\u7b97\u6cd5\u5c01\u88c5\u8d77\u6765&#xff0c;\u5e76\u8ba9\u5b83\u4eec\u53ef\u4ee5\u76f8\u4e92\u66ff\u6362\u3002\u8ba9\u7b97\u6cd5\u7684\u53d8\u5316\u72ec\u7acb\u4e8e\u4f7f\u7528\u7b97\u6cd5\u7684\u5ba2\u6237\u3002<\/p>\n<h5>24.2 \u7b56\u7565\u6a21\u5f0f\u7ed3\u6784\u4e0e\u5b9e\u73b0<\/h5>\n<p><span class=\"token comment\">\/\/ \u62bd\u8c61\u7b56\u7565<\/span><br \/>\n<span class=\"token keyword\">public<\/span> <span class=\"token keyword\">interface<\/span> <span class=\"token class-name\">PayStrategy<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">void<\/span> <span class=\"token function\">pay<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">double<\/span> amount<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p><span class=\"token comment\">\/\/ \u5177\u4f53\u7b56\u7565<\/span><br \/>\n<span class=\"token keyword\">public<\/span> <span class=\"token keyword\">class<\/span> <span class=\"token class-name\">AliPayStrategy<\/span> <span class=\"token keyword\">implements<\/span> <span class=\"token class-name\">PayStrategy<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token annotation punctuation\">&#064;Override<\/span><br \/>\n    <span class=\"token keyword\">public<\/span> <span class=\"token keyword\">void<\/span> <span class=\"token function\">pay<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">double<\/span> amount<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token class-name\">System<\/span><span class=\"token punctuation\">.<\/span>out<span class=\"token punctuation\">.<\/span><span class=\"token function\">println<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;\u652f\u4ed8\u5b9d\u652f\u4ed8&#xff1a;&#034;<\/span> <span class=\"token operator\">&#043;<\/span> amount <span class=\"token operator\">&#043;<\/span> <span class=\"token string\">&#034;\u5143&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p><span class=\"token keyword\">public<\/span> <span class=\"token keyword\">class<\/span> <span class=\"token class-name\">WechatPayStrategy<\/span> <span class=\"token keyword\">implements<\/span> <span class=\"token class-name\">PayStrategy<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token annotation punctuation\">&#064;Override<\/span><br \/>\n    <span class=\"token keyword\">public<\/span> <span class=\"token keyword\">void<\/span> <span class=\"token function\">pay<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">double<\/span> amount<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token class-name\">System<\/span><span class=\"token punctuation\">.<\/span>out<span class=\"token punctuation\">.<\/span><span class=\"token function\">println<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;\u5fae\u4fe1\u652f\u4ed8&#xff1a;&#034;<\/span> <span class=\"token operator\">&#043;<\/span> amount <span class=\"token operator\">&#043;<\/span> <span class=\"token string\">&#034;\u5143&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p><span class=\"token keyword\">public<\/span> <span class=\"token keyword\">class<\/span> <span class=\"token class-name\">CreditCardStrategy<\/span> <span class=\"token keyword\">implements<\/span> <span class=\"token class-name\">PayStrategy<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token annotation punctuation\">&#064;Override<\/span><br \/>\n    <span class=\"token keyword\">public<\/span> <span class=\"token keyword\">void<\/span> <span class=\"token function\">pay<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">double<\/span> amount<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token class-name\">System<\/span><span class=\"token punctuation\">.<\/span>out<span class=\"token punctuation\">.<\/span><span class=\"token function\">println<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;\u4fe1\u7528\u5361\u652f\u4ed8&#xff1a;&#034;<\/span> <span class=\"token operator\">&#043;<\/span> amount <span class=\"token operator\">&#043;<\/span> <span class=\"token string\">&#034;\u5143&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p><span class=\"token comment\">\/\/ \u73af\u5883\u7c7b&#xff08;\u652f\u4ed8\u4e0a\u4e0b\u6587&#xff09;<\/span><br \/>\n<span class=\"token keyword\">public<\/span> <span class=\"token keyword\">class<\/span> <span class=\"token class-name\">PayContext<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">private<\/span> <span class=\"token class-name\">PayStrategy<\/span> strategy<span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token keyword\">public<\/span> <span class=\"token class-name\">PayContext<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">PayStrategy<\/span> strategy<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span> <span class=\"token keyword\">this<\/span><span class=\"token punctuation\">.<\/span>strategy <span class=\"token operator\">&#061;<\/span> strategy<span class=\"token punctuation\">;<\/span> <span class=\"token punctuation\">}<\/span><\/p>\n<p>    <span class=\"token keyword\">public<\/span> <span class=\"token keyword\">void<\/span> <span class=\"token function\">executePay<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">double<\/span> amount<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        strategy<span class=\"token punctuation\">.<\/span><span class=\"token function\">pay<\/span><span class=\"token punctuation\">(<\/span>amount<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p><span class=\"token comment\">\/\/ \u5ba2\u6237\u7aef<\/span><br \/>\n<span class=\"token class-name\">PayContext<\/span> ctx <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">PayContext<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">new<\/span> <span class=\"token class-name\">AliPayStrategy<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\nctx<span class=\"token punctuation\">.<\/span><span class=\"token function\">executePay<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">99.9<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>  <span class=\"token comment\">\/\/ \u652f\u4ed8\u5b9d\u652f\u4ed8&#xff1a;99.9\u5143<\/span><\/p>\n<h5>24.3 \u7b56\u7565\u6a21\u5f0f\u5e94\u7528\u5b9e\u4f8b<\/h5>\n<ul>\n<li>\u652f\u4ed8\u65b9\u5f0f\u9009\u62e9<\/li>\n<li>\u4fc3\u9500\u6298\u6263\u8ba1\u7b97&#xff08;\u6ee1\u51cf\u3001\u6253\u6298\u3001\u8fd4\u73b0&#xff09;<\/li>\n<li>\u6570\u636e\u538b\u7f29\/\u52a0\u5bc6\u7b97\u6cd5\u9009\u62e9<\/li>\n<li>\u6392\u5e8f\u7b97\u6cd5\u9009\u62e9<\/li>\n<\/ul>\n<h5>24.4 Java SE\u4e2d\u7684\u5e03\u5c40\u7ba1\u7406<\/h5>\n<p>java.awt.LayoutManager \u5c31\u662f\u7b56\u7565\u6a21\u5f0f\u7684\u7ecf\u5178\u5e94\u7528&#xff1a;<\/p>\n<p>frame<span class=\"token punctuation\">.<\/span><span class=\"token function\">setLayout<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">new<\/span> <span class=\"token class-name\">FlowLayout<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>     <span class=\"token comment\">\/\/ \u6d41\u5f0f\u5e03\u5c40<\/span><br \/>\nframe<span class=\"token punctuation\">.<\/span><span class=\"token function\">setLayout<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">new<\/span> <span class=\"token class-name\">BorderLayout<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>   <span class=\"token comment\">\/\/ \u8fb9\u754c\u5e03\u5c40<\/span><br \/>\nframe<span class=\"token punctuation\">.<\/span><span class=\"token function\">setLayout<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">new<\/span> <span class=\"token class-name\">GridLayout<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">3<\/span><span class=\"token punctuation\">,<\/span><span class=\"token number\">3<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>  <span class=\"token comment\">\/\/ \u7f51\u683c\u5e03\u5c40<\/span><\/p>\n<h5>24.5 \u7b56\u7565\u6a21\u5f0f\u4f18\u7f3a\u70b9\u4e0e\u9002\u7528\u73af\u5883<\/h5>\n<table>\n<tr>\u4f18\u70b9 \u2705\u7f3a\u70b9 \u274c<\/tr>\n<tbody>\n<tr>\n<td align=\"left\">\u7b97\u6cd5\u53ef\u81ea\u7531\u5207\u6362<\/td>\n<td align=\"left\">\u5ba2\u6237\u7aef\u9700\u4e86\u89e3\u6240\u6709\u7b56\u7565<\/td>\n<\/tr>\n<tr>\n<td align=\"left\">\u907f\u514d\u591a\u91cd\u6761\u4ef6\u5224\u65ad<\/td>\n<td align=\"left\">\u7b56\u7565\u7c7b\u6570\u91cf\u589e\u591a<\/td>\n<\/tr>\n<tr>\n<td align=\"left\">\u6269\u5c55\u6027\u597d&#xff0c;\u7b26\u5408OCP<\/td>\n<td align=\"left\">\u6240\u6709\u7b56\u7565\u7c7b\u90fd\u9700\u5bf9\u5916\u66b4\u9732<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>&#x1f4a1; \u5b9e\u9645\u5f00\u53d1\u4e2d\u5e38\u7ed3\u5408\u5de5\u5382\u6a21\u5f0f\u6216\u679a\u4e3e\u6765\u9009\u62e9\u7b56\u7565&#xff0c;\u907f\u514d\u5ba2\u6237\u7aef\u76f4\u63a5\u4f9d\u8d56\u5177\u4f53\u7b56\u7565\u3002<\/p>\n<hr \/>\n<h4>\u7b2c25\u7ae0 \u6a21\u677f\u65b9\u6cd5\u6a21\u5f0f<\/h4>\n<h5>25.1 \u6a21\u677f\u65b9\u6cd5\u6a21\u5f0f\u6982\u8ff0<\/h5>\n<p>\u6a21\u677f\u65b9\u6cd5\u6a21\u5f0f&#xff08;Template Method Pattern&#xff09;\u5b9a\u4e49\u4e00\u4e2a\u64cd\u4f5c\u4e2d\u7b97\u6cd5\u7684\u9aa8\u67b6&#xff0c;\u5c06\u4e00\u4e9b\u6b65\u9aa4\u5ef6\u8fdf\u5230\u5b50\u7c7b\u4e2d\u3002\u4f7f\u5f97\u5b50\u7c7b\u53ef\u4ee5\u4e0d\u6539\u53d8\u7b97\u6cd5\u7ed3\u6784\u5373\u53ef\u91cd\u5b9a\u4e49\u67d0\u4e9b\u7279\u5b9a\u6b65\u9aa4\u3002<\/p>\n<p>&#x1f4a1; \u8fd9\u662f\u6700\u7b80\u5355\u7684\u8bbe\u8ba1\u6a21\u5f0f\u4e4b\u4e00&#xff0c;\u4e5f\u662f\u4f7f\u7528\u6700\u5e7f\u6cdb\u7684\u6a21\u5f0f\u4e4b\u4e00\u3002<\/p>\n<h5>25.2 \u6a21\u677f\u65b9\u6cd5\u6a21\u5f0f\u7ed3\u6784\u4e0e\u5b9e\u73b0<\/h5>\n<p><span class=\"token comment\">\/\/ \u62bd\u8c61\u7c7b&#xff1a;\u5b9a\u4e49\u6a21\u677f\u65b9\u6cd5<\/span><br \/>\n<span class=\"token keyword\">public<\/span> <span class=\"token keyword\">abstract<\/span> <span class=\"token keyword\">class<\/span> <span class=\"token class-name\">DataProcessor<\/span> <span class=\"token punctuation\">{<\/span><\/p>\n<p>    <span class=\"token comment\">\/\/ \u6a21\u677f\u65b9\u6cd5&#xff08;final\u9632\u6b62\u5b50\u7c7b\u8986\u76d6&#xff09;<\/span><br \/>\n    <span class=\"token keyword\">public<\/span> <span class=\"token keyword\">final<\/span> <span class=\"token keyword\">void<\/span> <span class=\"token function\">process<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token function\">readData<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token function\">processData<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token function\">needLog<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span>       <span class=\"token comment\">\/\/ \u94a9\u5b50\u65b9\u6cd5\u63a7\u5236\u6d41\u7a0b<\/span><br \/>\n            <span class=\"token function\">writeLog<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span><br \/>\n        <span class=\"token function\">writeData<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><\/p>\n<p>    <span class=\"token comment\">\/\/ \u62bd\u8c61\u6b65\u9aa4&#xff1a;\u5b50\u7c7b\u5fc5\u987b\u5b9e\u73b0<\/span><br \/>\n    <span class=\"token keyword\">protected<\/span> <span class=\"token keyword\">abstract<\/span> <span class=\"token keyword\">void<\/span> <span class=\"token function\">readData<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">protected<\/span> <span class=\"token keyword\">abstract<\/span> <span class=\"token keyword\">void<\/span> <span class=\"token function\">processData<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token comment\">\/\/ \u516c\u5171\u6b65\u9aa4&#xff1a;\u5b50\u7c7b\u53ef\u76f4\u63a5\u4f7f\u7528<\/span><br \/>\n    <span class=\"token keyword\">protected<\/span> <span class=\"token keyword\">void<\/span> <span class=\"token function\">writeData<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token class-name\">System<\/span><span class=\"token punctuation\">.<\/span>out<span class=\"token punctuation\">.<\/span><span class=\"token function\">println<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;&#x1f4dd; \u5199\u5165\u6570\u636e&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><\/p>\n<p>    <span class=\"token comment\">\/\/ \u94a9\u5b50\u65b9\u6cd5&#xff1a;\u5b50\u7c7b\u53ef\u9009\u62e9\u6027\u8986\u76d6<\/span><br \/>\n    <span class=\"token keyword\">protected<\/span> <span class=\"token keyword\">boolean<\/span> <span class=\"token function\">needLog<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span> <span class=\"token keyword\">return<\/span> <span class=\"token boolean\">true<\/span><span class=\"token punctuation\">;<\/span> <span class=\"token punctuation\">}<\/span><\/p>\n<p>    <span class=\"token keyword\">protected<\/span> <span class=\"token keyword\">void<\/span> <span class=\"token function\">writeLog<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token class-name\">System<\/span><span class=\"token punctuation\">.<\/span>out<span class=\"token punctuation\">.<\/span><span class=\"token function\">println<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;&#x1f4cb; \u8bb0\u5f55\u65e5\u5fd7&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p><span class=\"token comment\">\/\/ \u5177\u4f53\u5b50\u7c7b&#xff1a;CSV\u5904\u7406\u5668<\/span><br \/>\n<span class=\"token keyword\">public<\/span> <span class=\"token keyword\">class<\/span> <span class=\"token class-name\">CSVProcessor<\/span> <span class=\"token keyword\">extends<\/span> <span class=\"token class-name\">DataProcessor<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token annotation punctuation\">&#064;Override<\/span><br \/>\n    <span class=\"token keyword\">protected<\/span> <span class=\"token keyword\">void<\/span> <span class=\"token function\">readData<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token class-name\">System<\/span><span class=\"token punctuation\">.<\/span>out<span class=\"token punctuation\">.<\/span><span class=\"token function\">println<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;&#x1f4c2; \u8bfb\u53d6CSV\u6587\u4ef6&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><\/p>\n<p>    <span class=\"token annotation punctuation\">&#064;Override<\/span><br \/>\n    <span class=\"token keyword\">protected<\/span> <span class=\"token keyword\">void<\/span> <span class=\"token function\">processData<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token class-name\">System<\/span><span class=\"token punctuation\">.<\/span>out<span class=\"token punctuation\">.<\/span><span class=\"token function\">println<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;\u2699\ufe0f \u89e3\u6790CSV\u6570\u636e&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p><span class=\"token comment\">\/\/ \u5177\u4f53\u5b50\u7c7b&#xff1a;\u6570\u636e\u5e93\u5904\u7406\u5668&#xff08;\u4e0d\u9700\u8981\u65e5\u5fd7&#xff09;<\/span><br \/>\n<span class=\"token keyword\">public<\/span> <span class=\"token keyword\">class<\/span> <span class=\"token class-name\">DBProcessor<\/span> <span class=\"token keyword\">extends<\/span> <span class=\"token class-name\">DataProcessor<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token annotation punctuation\">&#064;Override<\/span><br \/>\n    <span class=\"token keyword\">protected<\/span> <span class=\"token keyword\">void<\/span> <span class=\"token function\">readData<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token class-name\">System<\/span><span class=\"token punctuation\">.<\/span>out<span class=\"token punctuation\">.<\/span><span class=\"token function\">println<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;&#x1f5c4;\ufe0f \u4ece\u6570\u636e\u5e93\u8bfb\u53d6&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><\/p>\n<p>    <span class=\"token annotation punctuation\">&#064;Override<\/span><br \/>\n    <span class=\"token keyword\">protected<\/span> <span class=\"token keyword\">void<\/span> <span class=\"token function\">processData<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token class-name\">System<\/span><span class=\"token punctuation\">.<\/span>out<span class=\"token punctuation\">.<\/span><span class=\"token function\">println<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;\u2699\ufe0f \u6570\u636e\u6e05\u6d17\u8f6c\u6362&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><\/p>\n<p>    <span class=\"token annotation punctuation\">&#064;Override<\/span><br \/>\n    <span class=\"token keyword\">protected<\/span> <span class=\"token keyword\">boolean<\/span> <span class=\"token function\">needLog<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span> <span class=\"token keyword\">return<\/span> <span class=\"token boolean\">false<\/span><span class=\"token punctuation\">;<\/span> <span class=\"token punctuation\">}<\/span>  <span class=\"token comment\">\/\/ \u8986\u76d6\u94a9\u5b50<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<h5>25.3 \u6a21\u677f\u65b9\u6cd5\u6a21\u5f0f\u5e94\u7528\u5b9e\u4f8b<\/h5>\n<ul>\n<li>JUnit\u7684 setUp() \/ tearDown() \/ runTest()<\/li>\n<li>Spring\u7684 JdbcTemplate\u3001RestTemplate<\/li>\n<li>Servlet\u7684 HttpServlet&#xff08;doGet\u3001doPost&#xff09;<\/li>\n<li>AbstractList\u3001AbstractMap<\/li>\n<\/ul>\n<h5>25.4 \u94a9\u5b50\u65b9\u6cd5\u7684\u4f7f\u7528<\/h5>\n<p>\u94a9\u5b50\u65b9\u6cd5&#xff08;Hook Method&#xff09;\u63d0\u4f9b\u9ed8\u8ba4\u5b9e\u73b0&#xff0c;\u5b50\u7c7b\u53ef\u4ee5\u9009\u62e9\u6027\u8986\u76d6&#xff0c;\u7528\u4e8e&#xff1a;<\/p>\n<ul>\n<li>\u63a7\u5236\u6a21\u677f\u65b9\u6cd5\u7684\u6267\u884c\u6d41\u7a0b<\/li>\n<li>\u63d0\u4f9b\u53ef\u9009\u7684\u6269\u5c55\u70b9<\/li>\n<li>\u5b9e\u73b0&#034;\u597d\u83b1\u575e\u539f\u5219&#034;&#xff08;Don\u2019t call us, we\u2019ll call you&#xff09;<\/li>\n<\/ul>\n<h5>25.5 \u6a21\u677f\u65b9\u6cd5\u6a21\u5f0f\u4f18\u7f3a\u70b9\u4e0e\u9002\u7528\u73af\u5883<\/h5>\n<table>\n<tr>\u4f18\u70b9 \u2705\u7f3a\u70b9 \u274c<\/tr>\n<tbody>\n<tr>\n<td align=\"left\">\u5c01\u88c5\u4e0d\u53d8\u90e8\u5206&#xff0c;\u6269\u5c55\u53ef\u53d8\u90e8\u5206<\/td>\n<td align=\"left\">\u6bcf\u4e2a\u4e0d\u540c\u5b9e\u73b0\u90fd\u9700\u8981\u4e00\u4e2a\u5b50\u7c7b<\/td>\n<\/tr>\n<tr>\n<td align=\"left\">\u63d0\u53d6\u516c\u5171\u4ee3\u7801&#xff0c;\u4fbf\u4e8e\u7ef4\u62a4<\/td>\n<td align=\"left\">\u7ee7\u627f\u5e26\u6765\u5f3a\u8026\u5408<\/td>\n<\/tr>\n<tr>\n<td align=\"left\">\u884c\u4e3a\u7531\u7236\u7c7b\u63a7\u5236&#xff0c;\u5b50\u7c7b\u5b9e\u73b0<\/td>\n<td align=\"left\">\u9605\u8bfb\u4ee3\u7801\u9700\u8981\u8df3\u8f6c&#xff08;\u53cd\u76f4\u89c9&#xff09;<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<hr \/>\n<h4>\u7b2c26\u7ae0 \u8bbf\u95ee\u8005\u6a21\u5f0f<\/h4>\n<h5>26.1 \u8bbf\u95ee\u8005\u6a21\u5f0f\u6982\u8ff0<\/h5>\n<p>\u8bbf\u95ee\u8005\u6a21\u5f0f&#xff08;Visitor Pattern&#xff09;\u8868\u793a\u4e00\u4e2a\u4f5c\u7528\u4e8e\u67d0\u5bf9\u8c61\u7ed3\u6784\u4e2d\u7684\u5404\u5143\u7d20\u7684\u64cd\u4f5c&#xff0c;\u5b83\u4f7f\u4f60\u53ef\u4ee5\u5728\u4e0d\u6539\u53d8\u5404\u5143\u7d20\u7c7b\u7684\u524d\u63d0\u4e0b\u5b9a\u4e49\u4f5c\u7528\u4e8e\u8fd9\u4e9b\u5143\u7d20\u7684\u65b0\u64cd\u4f5c\u3002<\/p>\n<p>\u26a0\ufe0f \u8fd9\u662fGoF 23\u79cd\u6a21\u5f0f\u4e2d\u6700\u590d\u6742\u3001\u4f7f\u7528\u6700\u5c11\u7684\u6a21\u5f0f\u3002<\/p>\n<h5>26.2 \u8bbf\u95ee\u8005\u6a21\u5f0f\u7ed3\u6784\u4e0e\u5b9e\u73b0<\/h5>\n<p><span class=\"token comment\">\/\/ \u62bd\u8c61\u5143\u7d20<\/span><br \/>\n<span class=\"token keyword\">public<\/span> <span class=\"token keyword\">interface<\/span> <span class=\"token class-name\">Element<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">void<\/span> <span class=\"token function\">accept<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">Visitor<\/span> visitor<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>  <span class=\"token comment\">\/\/ \u53cc\u5206\u6d3e\u7684\u5173\u952e<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p><span class=\"token comment\">\/\/ \u5177\u4f53\u5143\u7d20<\/span><br \/>\n<span class=\"token keyword\">public<\/span> <span class=\"token keyword\">class<\/span> <span class=\"token class-name\">Book<\/span> <span class=\"token keyword\">implements<\/span> <span class=\"token class-name\">Element<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">private<\/span> <span class=\"token class-name\">String<\/span> name<span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">private<\/span> <span class=\"token keyword\">double<\/span> price<span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token keyword\">public<\/span> <span class=\"token class-name\">Book<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">String<\/span> name<span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">double<\/span> price<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token keyword\">this<\/span><span class=\"token punctuation\">.<\/span>name <span class=\"token operator\">&#061;<\/span> name<span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">this<\/span><span class=\"token punctuation\">.<\/span>price <span class=\"token operator\">&#061;<\/span> price<span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><\/p>\n<p>    <span class=\"token annotation punctuation\">&#064;Override<\/span><br \/>\n    <span class=\"token keyword\">public<\/span> <span class=\"token keyword\">void<\/span> <span class=\"token function\">accept<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">Visitor<\/span> visitor<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        visitor<span class=\"token punctuation\">.<\/span><span class=\"token function\">visit<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">this<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>  <span class=\"token comment\">\/\/ \u5c06\u81ea\u8eab\u4f20\u7ed9\u8bbf\u95ee\u8005<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><\/p>\n<p>    <span class=\"token comment\">\/\/ getters&#8230;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p><span class=\"token keyword\">public<\/span> <span class=\"token keyword\">class<\/span> <span class=\"token class-name\">Fruit<\/span> <span class=\"token keyword\">implements<\/span> <span class=\"token class-name\">Element<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">private<\/span> <span class=\"token class-name\">String<\/span> name<span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">private<\/span> <span class=\"token keyword\">double<\/span> weight<span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token keyword\">public<\/span> <span class=\"token class-name\">Fruit<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">String<\/span> name<span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">double<\/span> weight<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token keyword\">this<\/span><span class=\"token punctuation\">.<\/span>name <span class=\"token operator\">&#061;<\/span> name<span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">this<\/span><span class=\"token punctuation\">.<\/span>weight <span class=\"token operator\">&#061;<\/span> weight<span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><\/p>\n<p>    <span class=\"token annotation punctuation\">&#064;Override<\/span><br \/>\n    <span class=\"token keyword\">public<\/span> <span class=\"token keyword\">void<\/span> <span class=\"token function\">accept<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">Visitor<\/span> visitor<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        visitor<span class=\"token punctuation\">.<\/span><span class=\"token function\">visit<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">this<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p><span class=\"token comment\">\/\/ \u62bd\u8c61\u8bbf\u95ee\u8005<\/span><br \/>\n<span class=\"token keyword\">public<\/span> <span class=\"token keyword\">interface<\/span> <span class=\"token class-name\">Visitor<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">void<\/span> <span class=\"token function\">visit<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">Book<\/span> book<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">void<\/span> <span class=\"token function\">visit<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">Fruit<\/span> fruit<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p><span class=\"token comment\">\/\/ \u5177\u4f53\u8bbf\u95ee\u8005&#xff1a;\u8ba1\u7b97\u603b\u4ef7<\/span><br \/>\n<span class=\"token keyword\">public<\/span> <span class=\"token keyword\">class<\/span> <span class=\"token class-name\">TotalPriceVisitor<\/span> <span class=\"token keyword\">implements<\/span> <span class=\"token class-name\">Visitor<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">private<\/span> <span class=\"token keyword\">double<\/span> total <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token annotation punctuation\">&#064;Override<\/span><br \/>\n    <span class=\"token keyword\">public<\/span> <span class=\"token keyword\">void<\/span> <span class=\"token function\">visit<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">Book<\/span> book<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        total <span class=\"token operator\">&#043;&#061;<\/span> book<span class=\"token punctuation\">.<\/span><span class=\"token function\">getPrice<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><\/p>\n<p>    <span class=\"token annotation punctuation\">&#064;Override<\/span><br \/>\n    <span class=\"token keyword\">public<\/span> <span class=\"token keyword\">void<\/span> <span class=\"token function\">visit<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">Fruit<\/span> fruit<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        total <span class=\"token operator\">&#043;&#061;<\/span> fruit<span class=\"token punctuation\">.<\/span><span class=\"token function\">getWeight<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token operator\">*<\/span> <span class=\"token number\">10<\/span><span class=\"token punctuation\">;<\/span>  <span class=\"token comment\">\/\/ \u5047\u8bbe10\u5143\/kg<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><\/p>\n<p>    <span class=\"token keyword\">public<\/span> <span class=\"token keyword\">double<\/span> <span class=\"token function\">getTotal<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span> <span class=\"token keyword\">return<\/span> total<span class=\"token punctuation\">;<\/span> <span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p><span class=\"token comment\">\/\/ \u5bf9\u8c61\u7ed3\u6784&#xff08;\u8d2d\u7269\u8f66&#xff09;<\/span><br \/>\n<span class=\"token keyword\">public<\/span> <span class=\"token keyword\">class<\/span> <span class=\"token class-name\">ShoppingCart<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">private<\/span> <span class=\"token class-name\">List<\/span><span class=\"token generics\"><span class=\"token punctuation\">&lt;<\/span><span class=\"token class-name\">Element<\/span><span class=\"token punctuation\">&gt;<\/span><\/span> items <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">ArrayList<\/span><span class=\"token generics\"><span class=\"token punctuation\">&lt;<\/span><span class=\"token punctuation\">&gt;<\/span><\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token keyword\">public<\/span> <span class=\"token keyword\">void<\/span> <span class=\"token function\">add<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">Element<\/span> e<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span> items<span class=\"token punctuation\">.<\/span><span class=\"token function\">add<\/span><span class=\"token punctuation\">(<\/span>e<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span> <span class=\"token punctuation\">}<\/span><\/p>\n<p>    <span class=\"token keyword\">public<\/span> <span class=\"token keyword\">void<\/span> <span class=\"token function\">accept<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">Visitor<\/span> visitor<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token keyword\">for<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token class-name\">Element<\/span> item <span class=\"token operator\">:<\/span> items<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n            item<span class=\"token punctuation\">.<\/span><span class=\"token function\">accept<\/span><span class=\"token punctuation\">(<\/span>visitor<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<h5>26.3 \u8bbf\u95ee\u8005\u6a21\u5f0f\u5e94\u7528\u5b9e\u4f8b<\/h5>\n<ul>\n<li>\u7f16\u8bd1\u5668\u5bf9AST\u7684\u591a\u79cd\u64cd\u4f5c&#xff08;\u7c7b\u578b\u68c0\u67e5\u3001\u4ee3\u7801\u751f\u6210\u3001\u4f18\u5316&#xff09;<\/li>\n<li>\u8d2d\u7269\u8f66\u7ed3\u7b97&#xff08;\u4ef7\u683c\u8ba1\u7b97\u3001\u91cd\u91cf\u7edf\u8ba1\u3001\u6298\u6263\u8ba1\u7b97&#xff09;<\/li>\n<li>\u6587\u6863\u7ed3\u6784\u7684\u591a\u683c\u5f0f\u5bfc\u51fa&#xff08;PDF\u3001HTML\u3001Markdown&#xff09;<\/li>\n<\/ul>\n<h5>26.4 \u8bbf\u95ee\u8005\u6a21\u5f0f\u4e0e\u7ec4\u5408\u6a21\u5f0f\u8054\u7528<\/h5>\n<p>\u8bbf\u95ee\u8005\u6a21\u5f0f\u5e38\u4e0e\u7ec4\u5408\u6a21\u5f0f\u914d\u5408&#xff0c;\u904d\u5386\u6811\u5f62\u7ed3\u6784\u5e76\u5bf9\u6bcf\u4e2a\u8282\u70b9\u6267\u884c\u4e0d\u540c\u64cd\u4f5c\u3002<\/p>\n<h5>26.5 \u8bbf\u95ee\u8005\u6a21\u5f0f\u4f18\u7f3a\u70b9\u4e0e\u9002\u7528\u73af\u5883<\/h5>\n<table>\n<tr>\u4f18\u70b9 \u2705\u7f3a\u70b9 \u274c<\/tr>\n<tbody>\n<tr>\n<td align=\"left\">\u589e\u52a0\u65b0\u64cd\u4f5c\u5f88\u5bb9\u6613&#xff08;\u65b0\u589eVisitor&#xff09;<\/td>\n<td align=\"left\">\u589e\u52a0\u65b0\u5143\u7d20\u5f88\u56f0\u96be&#xff08;\u9700\u4fee\u6539\u6240\u6709Visitor&#xff09;<\/td>\n<\/tr>\n<tr>\n<td align=\"left\">\u5c06\u76f8\u5173\u64cd\u4f5c\u96c6\u4e2d\u5230\u4e00\u4e2a\u8bbf\u95ee\u8005\u4e2d<\/td>\n<td align=\"left\">\u7834\u574f\u5c01\u88c5&#xff0c;\u9700\u66b4\u9732\u5143\u7d20\u5185\u90e8\u72b6\u6001<\/td>\n<\/tr>\n<tr>\n<td align=\"left\">\u53ef\u4ee5\u8de8\u5c42\u6b21\u8bbf\u95ee\u4e0d\u540c\u5bf9\u8c61<\/td>\n<td align=\"left\">\u4f7f\u7528\u573a\u666f\u5c11&#xff0c;\u5b66\u4e60\u6210\u672c\u9ad8<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>\u9002\u7528\u73af\u5883&#xff1a;\u5bf9\u8c61\u7ed3\u6784\u4e2d\u7684\u5143\u7d20\u7c7b\u5f88\u5c11\u6539\u53d8&#xff0c;\u4f46\u7ecf\u5e38\u9700\u8981\u5728\u6b64\u7ed3\u6784\u4e0a\u5b9a\u4e49\u65b0\u7684\u64cd\u4f5c\u3002<\/p>\n<hr \/>\n<h3>\u9644\u5f55&#xff1a;UML\u7c7b\u56fe<\/h3>\n<h4>A.1 UML\u6982\u8ff0<\/h4>\n<p>UML&#xff08;Unified Modeling Language&#xff09;\u662f\u9762\u5411\u5bf9\u8c61\u5efa\u6a21\u7684\u6807\u51c6\u8bed\u8a00&#xff0c;\u8bbe\u8ba1\u6a21\u5f0f\u7684\u63cf\u8ff0\u5927\u91cf\u4f7f\u7528UML\u7c7b\u56fe\u3002<\/p>\n<h4>A.2 \u7c7b\u4e0e\u7c7b\u7684UML\u8868\u793a<\/h4>\n<p>\u250c\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2510<br \/>\n\u2502  \u7c7b\u540d&#xff08;\u62bd\u8c61\u7528\u659c\u4f53&#xff09;  \u2502  \u2190 \u7b2c\u4e00\u5c42&#xff1a;\u7c7b\u540d<br \/>\n\u251c\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2524<br \/>\n\u2502  &#8211; name: String     \u2502  \u2190 \u7b2c\u4e8c\u5c42&#xff1a;\u5c5e\u6027<br \/>\n\u2502  &#043; age: int         \u2502<br \/>\n\u251c\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2524<br \/>\n\u2502  &#043; getName(): String\u2502  \u2190 \u7b2c\u4e09\u5c42&#xff1a;\u65b9\u6cd5<br \/>\n\u2502  &#043; setName(n): void \u2502<br \/>\n\u2514\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2518<\/p>\n<p>\u8bbf\u95ee\u4fee\u9970\u7b26&#xff1a;&#043; public  &#8211; private  # protected  ~ package<\/p>\n<h4>A.3 \u7c7b\u4e4b\u95f4\u7684\u5173\u7cfb<\/h4>\n<table>\n<tr>\u5173\u7cfbUML\u8868\u793a\u4ee3\u7801\u4f53\u73b0\u8bf4\u660e<\/tr>\n<tbody>\n<tr>\n<td align=\"center\">\u5173\u8054<\/td>\n<td align=\"center\">\u2014\u2014\u2192<\/td>\n<td align=\"center\">\u6210\u5458\u53d8\u91cf\u5f15\u7528<\/td>\n<td align=\"left\">\u5bf9\u8c61\u95f4\u7684\u957f\u671f\u5f15\u7528\u5173\u7cfb<\/td>\n<\/tr>\n<tr>\n<td align=\"center\">\u805a\u5408<\/td>\n<td align=\"center\">\u25c7\u2014\u2014<\/td>\n<td align=\"center\">\u6210\u5458\u53d8\u91cf&#xff08;\u53ef\u72ec\u7acb\u5b58\u5728&#xff09;<\/td>\n<td align=\"left\">\u6574\u4f53\u4e0e\u90e8\u5206&#xff08;\u5f31\u62e5\u6709&#xff09;<\/td>\n<\/tr>\n<tr>\n<td align=\"center\">\u7ec4\u5408<\/td>\n<td align=\"center\">\u25c6\u2014\u2014<\/td>\n<td align=\"center\">\u6210\u5458\u53d8\u91cf&#xff08;\u4e0d\u53ef\u72ec\u7acb&#xff09;<\/td>\n<td align=\"left\">\u6574\u4f53\u4e0e\u90e8\u5206&#xff08;\u5f3a\u62e5\u6709&#xff09;<\/td>\n<\/tr>\n<tr>\n<td align=\"center\">\u7ee7\u627f<\/td>\n<td align=\"center\">\u2014\u2014\u25b7<\/td>\n<td align=\"center\">extends<\/td>\n<td align=\"left\">\u6cdb\u5316\u5173\u7cfb&#xff08;is-a&#xff09;<\/td>\n<\/tr>\n<tr>\n<td align=\"center\">\u5b9e\u73b0<\/td>\n<td align=\"center\">&#8211;\u25b7<\/td>\n<td align=\"center\">implements<\/td>\n<td align=\"left\">\u7c7b\u5b9e\u73b0\u63a5\u53e3<\/td>\n<\/tr>\n<tr>\n<td align=\"center\">\u4f9d\u8d56<\/td>\n<td align=\"center\">&#8211;\u2192<\/td>\n<td align=\"center\">\u65b9\u6cd5\u53c2\u6570\/\u5c40\u90e8\u53d8\u91cf<\/td>\n<td align=\"left\">\u4e34\u65f6\u4f7f\u7528\u5173\u7cfb<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>&#x1f4a1; \u8bb0\u5fc6\u53e3\u8bc0&#xff1a;\u4f9d\u8d56\u6700\u5f31&#xff0c;\u5173\u8054\u6b21\u4e4b&#xff0c;\u805a\u5408\u7ec4\u5408\u66f4\u5f3a&#xff0c;\u7ee7\u627f\u5b9e\u73b0\u6700\u5f3a\u3002<\/p>\n<hr \/>\n<h3>\u5168\u6587\u603b\u7ed3<\/h3>\n<h4>&#x1f5fa;\ufe0f \u8bbe\u8ba1\u6a21\u5f0f\u5168\u666f\u56fe<\/h4>\n<p>\u8bbe\u8ba1\u6a21\u5f0f&#xff08;23&#043;1\u79cd&#xff09;<br \/>\n\u2502<br \/>\n\u251c\u2500\u2500 \u521b\u5efa\u578b&#xff08;\u600e\u4e48\u9020&#xff09;<br \/>\n\u2502   \u251c\u2500\u2500 \u7b80\u5355\u5de5\u5382 \u2500\u2500 \u4e00\u4e2a\u5de5\u5382\u9020\u6240\u6709<br \/>\n\u2502   \u251c\u2500\u2500 \u5de5\u5382\u65b9\u6cd5 \u2500\u2500 \u4e00\u4e2a\u5de5\u5382\u9020\u4e00\u79cd<br \/>\n\u2502   \u251c\u2500\u2500 \u62bd\u8c61\u5de5\u5382 \u2500\u2500 \u4e00\u4e2a\u5de5\u5382\u9020\u4e00\u65cf<br \/>\n\u2502   \u251c\u2500\u2500 \u5efa\u9020\u8005   \u2500\u2500 \u5206\u6b65\u9aa4\u9020\u590d\u6742\u5bf9\u8c61<br \/>\n\u2502   \u251c\u2500\u2500 \u539f\u578b     \u2500\u2500 \u514b\u9686\u5df2\u6709\u5bf9\u8c61<br \/>\n\u2502   \u2514\u2500\u2500 \u5355\u4f8b     \u2500\u2500 \u5168\u5c40\u53ea\u6709\u4e00\u4e2a<br \/>\n\u2502<br \/>\n\u251c\u2500\u2500 \u7ed3\u6784\u578b&#xff08;\u600e\u4e48\u7ec4&#xff09;<br \/>\n\u2502   \u251c\u2500\u2500 \u9002\u914d\u5668 \u2500\u2500 \u63a5\u53e3\u8f6c\u6362<br \/>\n\u2502   \u251c\u2500\u2500 \u6865\u63a5   \u2500\u2500 \u591a\u7ef4\u5ea6\u5206\u79bb<br \/>\n\u2502   \u251c\u2500\u2500 \u7ec4\u5408   \u2500\u2500 \u6811\u5f62\u7ed3\u6784<br \/>\n\u2502   \u251c\u2500\u2500 \u88c5\u9970   \u2500\u2500 \u52a8\u6001\u589e\u5f3a<br \/>\n\u2502   \u251c\u2500\u2500 \u5916\u89c2   \u2500\u2500 \u7edf\u4e00\u5165\u53e3<br \/>\n\u2502   \u251c\u2500\u2500 \u4eab\u5143   \u2500\u2500 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align=\"left\">\u6d88\u9664if-else\u3001Spring\u4e2d\u7684\u5e94\u7528<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<hr \/>\n<p>&#x1f4a1; \u4e00\u53e5\u8bdd\u603b\u7ed3&#xff1a;\u8bbe\u8ba1\u6a21\u5f0f\u4e0d\u662f\u94f6\u5f39&#xff0c;\u800c\u662f\u524d\u4eba\u8e29\u5751\u540e\u603b\u7ed3\u7684\u7ecf\u9a8c\u5730\u56fe\u3002\u8bfb\u61c2\u5730\u56fe&#xff0c;\u624d\u80fd\u5c11\u8d70\u5f2f\u8def\u3002<\/p>\n<p>\u5982\u679c\u8fd9\u7bc7\u6587\u7ae0\u5bf9\u4f60\u6709\u5e2e\u52a9&#xff0c;\u8bf7 \u70b9\u8d5e &#x1f44d; \u6536\u85cf \u2b50 \u5173\u6ce8 \u4e09\u8fde\u652f\u6301&#xff01;\u4f60\u7684\u9f13\u52b1\u662f\u6211\u6301\u7eed\u8f93\u51fa\u7684\u6700\u5927\u52a8\u529b&#xff01;<\/p>\n<hr \/>\n<p>&#x1f4da; \u53c2\u8003\u4e66\u7c4d&#xff1a;\u300aJava\u8bbe\u8ba1\u6a21\u5f0f\u300b&#xff08;\u5218\u4f1f \u8457&#xff0c;\u6e05\u534e\u5927\u5b66\u51fa\u7248\u793e&#xff09;<\/p>\n<p>&#x1f4c5; 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