{"id":48981,"date":"2025-07-30T14:19:03","date_gmt":"2025-07-30T06:19:03","guid":{"rendered":"https:\/\/www.wsisp.com\/helps\/48981.html"},"modified":"2025-07-30T14:19:03","modified_gmt":"2025-07-30T06:19:03","slug":"%e9%9b%b6%e5%9f%ba%e7%a1%80-%e5%85%a5%e5%9d%91-java-%e5%8d%81%e5%9b%9b%e3%80%81%e3%80%90%e7%bb%83%e4%b9%a0%e3%80%91%e5%9b%be%e4%b9%a6%e5%b0%8f%e7%b3%bb%e7%bb%9f","status":"publish","type":"post","link":"https:\/\/www.wsisp.com\/helps\/48981.html","title":{"rendered":"\u96f6\u57fa\u7840 \u201c\u5165\u5751\u201d Java--- \u5341\u56db\u3001\u3010\u7ec3\u4e60\u3011\u56fe\u4e66\u5c0f\u7cfb\u7edf"},"content":{"rendered":"<\/p>\n<h4>\u6587\u7ae0\u76ee\u5f55<\/h4>\n<ul>\n<li>\u4e00\u3001\u5448\u73b0\u6548\u679c<\/li>\n<li>\u4e8c\u3001\u5b9e\u73b0<\/li>\n<li>\n<ul>\n<li>1.\u4e66\u7c4d<\/li>\n<li>2.\u4e66\u67b6<\/li>\n<li>3.\u8eab\u4efd<\/li>\n<li>4.\u64cd\u4f5c<\/li>\n<li>\n<ul>\n<li>4.1 \u663e\u793a\u56fe\u4e66<\/li>\n<li>4.2 \u5220\u9664\u56fe\u4e66<\/li>\n<li>4.3 \u501f\u9605\u56fe\u4e66<\/li>\n<li>4.4 \u65b0\u589e\u56fe\u4e66<\/li>\n<li>4.5 \u67e5\u627e\u56fe\u4e66<\/li>\n<li>4.6 \u5f52\u8fd8\u56fe\u4e66<\/li>\n<li>4.7 \u9000\u51fa\u7cfb\u7edf<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<\/li>\n<li>\u4e09\u3001\u4ea4\u4e92<\/li>\n<\/ul>\n<p> \u5230\u76ee\u524d\u4e3a\u6b62&#xff0c;\u5728\u672c\u4e13\u680f\u4e2d\u6211\u4eec\u5df2\u7ecf\u5b66\u4e60\u4e86Java\u57fa\u7840\u8bed\u6cd5\u7684\u5927\u90e8\u5206\u5185\u5bb9&#xff0c;\u4e3a\u4e86\u66f4\u597d\u7684\u7406\u89e3\u548c\u638c\u63e1\u5b66\u8fc7\u7684\u77e5\u8bc6&#xff0c;\u6211\u4eec\u5c31\u7f16\u5199\u4e00\u4e2a\u56fe\u4e66\u5c0f\u7cfb\u7edf&#xff0c;\u5c06\u77e5\u8bc6\u8fd0\u7528\u8d77\u6765\u3002<\/p>\n<h2>\u4e00\u3001\u5448\u73b0\u6548\u679c<\/h2>\n<p>\u5bf9\u4e8e\u8fd9\u6837\u7684\u4e00\u4e2a\u5c0f\u7cfb\u7edf&#xff0c;\u6211\u4eec\u9700\u8981\u8f93\u5165\u7528\u6237\u7684\u59d3\u540d\u548c\u8eab\u4efd&#xff0c;\u6839\u636e\u7528\u6237\u9009\u62e9\u7684\u8eab\u4efd\u4e0d\u540c&#xff0c;\u5448\u73b0\u4e0d\u4e00\u6837\u7684\u754c\u9762&#xff0c;\u7ed9\u4e88\u7528\u6237\u4e0d\u540c\u7684\u64cd\u4f5c&#xff0c;\u518d\u6839\u636e\u7528\u6237\u7684\u9009\u62e9\u6267\u884c\u5bf9\u5e94\u7684\u64cd\u4f5c\u5373\u53ef\u3002<\/p>\n<hr \/>\n<p>\u7ba1\u7406\u5458\u64cd\u4f5c\u754c\u9762&#xff1a; <img decoding=\"async\" src=\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2025\/07\/20250730061901-6889b95502058.png\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\" \/><\/p>\n<p>\u666e\u901a\u7528\u6237\u64cd\u4f5c\u754c\u9762&#xff1a; <img decoding=\"async\" src=\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2025\/07\/20250730061901-6889b95553745.png\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\" \/><\/p>\n<h2>\u4e8c\u3001\u5b9e\u73b0<\/h2>\n<h3>1.\u4e66\u7c4d<\/h3>\n<p>\u56fe\u4e66\u5c0f\u7cfb\u7edf\u4e00\u5b9a\u548c\u4e66\u76f8\u5173&#xff0c;\u6240\u4ee5\u6211\u4eec\u9700\u8981\u5bf9\u4e66\u8fdb\u884c\u4e00\u4e9b\u64cd\u4f5c&#xff1a;<\/p>\n<p><span class=\"token keyword\">public<\/span> <span class=\"token keyword\">class<\/span> <span class=\"token class-name\">Book<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token comment\">\/\/\u4e00\u672c\u4e66\u7684\u5c5e\u6027<\/span><br \/>\n    <span class=\"token keyword\">private<\/span> <span class=\"token class-name\">String<\/span> name<span class=\"token punctuation\">;<\/span> <span class=\"token comment\">\/\/\u4e66\u540d<\/span><br \/>\n    <span class=\"token keyword\">private<\/span> <span class=\"token class-name\">String<\/span> author<span class=\"token punctuation\">;<\/span> <span class=\"token comment\">\/\/\u4f5c\u8005<\/span><br \/>\n    <span class=\"token keyword\">private<\/span> <span class=\"token keyword\">double<\/span> price<span class=\"token punctuation\">;<\/span> <span class=\"token comment\">\/\/\u4ef7\u683c<\/span><br \/>\n    <span class=\"token keyword\">private<\/span> <span class=\"token class-name\">String<\/span> type<span class=\"token punctuation\">;<\/span> <span class=\"token comment\">\/\/\u7c7b\u578b<\/span><br \/>\n    <span class=\"token keyword\">private<\/span> <span class=\"token keyword\">boolean<\/span> isBorrowed<span class=\"token punctuation\">;<\/span> <span class=\"token comment\">\/\/\u662f\u5426\u88ab\u501f\u51fa<\/span><\/p>\n<p>    <span class=\"token comment\">\/\/\u63d0\u4f9b\u6784\u9020\u65b9\u6cd5&#xff0c;\u65b9\u4fbf\u5b9e\u4f8b\u5316<\/span><br \/>\n    <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 class-name\">String<\/span> author<span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">double<\/span> price<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\">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>author <span class=\"token operator\">&#061;<\/span> author<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 keyword\">this<\/span><span class=\"token punctuation\">.<\/span>type <span class=\"token operator\">&#061;<\/span> type<span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token comment\">\/\/\u4e0d\u5b9e\u4f8b\u5316isBorrowed\u539f\u56e0&#xff1a;boolean\u9ed8\u8ba4\u503c\u4e3afalse&#xff0c;\u672a\u88ab\u501f\u51fa<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><\/p>\n<p>    <span class=\"token comment\">\/\/\u4e66\u7684\u5c5e\u6027\u88abprivate\u4fee\u9970&#xff0c;\u63d0\u4f9bget\u548cset\u65b9\u6cd5&#xff0c;\u65b9\u4fbf\u5728\u7c7b\u5916\u4f7f\u7528<\/span><br \/>\n    <span class=\"token keyword\">public<\/span> <span class=\"token class-name\">String<\/span> <span class=\"token function\">getName<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token keyword\">return<\/span> name<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\">setName<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">String<\/span> name<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><br \/>\n    <span class=\"token keyword\">public<\/span> <span class=\"token class-name\">String<\/span> <span class=\"token function\">getAuthor<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token keyword\">return<\/span> author<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\">setAuthor<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">String<\/span> author<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token keyword\">this<\/span><span class=\"token punctuation\">.<\/span>author <span class=\"token operator\">&#061;<\/span> author<span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n    <span class=\"token keyword\">public<\/span> <span class=\"token keyword\">double<\/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 keyword\">return<\/span> price<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\">setPrice<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">int<\/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>price <span class=\"token operator\">&#061;<\/span> price<span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n    <span class=\"token keyword\">public<\/span> <span class=\"token class-name\">String<\/span> <span class=\"token function\">getType<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token keyword\">return<\/span> type<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\">setType<\/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\">this<\/span><span class=\"token punctuation\">.<\/span>type <span class=\"token operator\">&#061;<\/span> type<span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n    <span class=\"token keyword\">public<\/span> <span class=\"token keyword\">boolean<\/span> <span class=\"token function\">isBorrowed<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token keyword\">return<\/span> isBorrowed<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\">setBorrowed<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">boolean<\/span> borrowed<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        isBorrowed <span class=\"token operator\">&#061;<\/span> borrowed<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\">String<\/span> <span class=\"token function\">toString<\/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 string\">&#034;Book{&#034;<\/span> <span class=\"token operator\">&#043;<\/span><br \/>\n                <span class=\"token string\">&#034;name&#061;&#039;&#034;<\/span> <span class=\"token operator\">&#043;<\/span> name <span class=\"token operator\">&#043;<\/span> <span class=\"token string\">&#039;\\\\&#039;&#039;<\/span> <span class=\"token operator\">&#043;<\/span><br \/>\n                <span class=\"token string\">&#034;, author&#061;&#039;&#034;<\/span> <span class=\"token operator\">&#043;<\/span> author <span class=\"token operator\">&#043;<\/span> <span class=\"token string\">&#039;\\\\&#039;&#039;<\/span> <span class=\"token operator\">&#043;<\/span><br \/>\n                <span class=\"token string\">&#034;, price&#061;&#034;<\/span> <span class=\"token operator\">&#043;<\/span> price <span class=\"token operator\">&#043;<\/span><br \/>\n                <span class=\"token string\">&#034;, type&#061;&#039;&#034;<\/span> <span class=\"token operator\">&#043;<\/span> type <span class=\"token operator\">&#043;<\/span> <span class=\"token string\">&#039;\\\\&#039;&#039;<\/span> <span class=\"token operator\">&#043;<\/span><br \/>\n                <span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">(<\/span>isBorrowed <span class=\"token operator\">&#061;&#061;<\/span> <span class=\"token boolean\">true<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token operator\">?<\/span> <span class=\"token string\">&#034;, \u5df2\u88ab\u501f\u51fa&#034;<\/span> <span class=\"token operator\">:<\/span> <span class=\"token string\">&#034;, \u672a\u88ab\u501f\u51fa&#034;<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token operator\">&#043;<\/span><br \/>\n<span class=\"token comment\">\/\/                &#034;, isBorrowed&#061;&#034; &#043; isBorrowed &#043;<\/span><br \/>\n                <span class=\"token string\">&#039;}&#039;<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p>\u5728Book\u8fd9\u4e2a\u7c7b\u4e2d&#xff0c;\u6211\u4eec\u5bf9\u4e66\u7684\u4e00\u4e9b\u5c5e\u6027&#xff08;\u5982&#xff1a;\u4e66\u540d\u3001\u4f5c\u8005\u7b49&#xff09;\u901a\u8fc7private\u8fdb\u884c\u5b9a\u4e49&#xff0c;\u4e3a\u4e86\u65b9\u4fbf\u5728\u7c7b\u5916\u4f7f\u7528\u8fd9\u4e9b\u5c5e\u6027&#xff0c;\u6211\u4eec\u63d0\u4f9bget \u548c set\u65b9\u6cd5&#xff1b;\u5728\u7ba1\u7406\u5458\u7684&#034;\u663e\u793a\u56fe\u4e66&#034;\u64cd\u4f5c\u4e2d&#xff0c;\u9700\u8981\u663e\u793a\u4e66\u7684\u5c5e\u6027&#xff0c;\u6240\u4ee5\u5728Book\u7c7b\u4e2d\u91cd\u5199toString\u65b9\u6cd5\u3002<\/p>\n<h3>2.\u4e66\u67b6<\/h3>\n<p>\u5c06\u4e66\u7c4d\u5b9a\u4e49\u597d\u4e4b\u540e&#xff0c;\u6211\u4eec\u5c31\u8003\u8651\u5982\u4f55\u624d\u80fd\u5b58\u653e\u4e66\u3002\u60f3\u8981\u5b58\u653e\u4e00\u7ec4\u76f8\u540c\u7c7b\u578b\u7684\u6570\u636e&#xff0c;\u5c31\u53ef\u4ee5\u4f7f\u7528\u6570\u7ec4\u3002<\/p>\n<p><span class=\"token keyword\">public<\/span> <span class=\"token keyword\">class<\/span> <span class=\"token class-name\">BookList<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token comment\">\/\/\u4e66\u67b6\u5b58\u653e\u4e66\u7684\u6700\u5927\u6570\u91cf&#xff08;\u6570\u7ec4\u5b58\u653e\u4e66&#xff09;<\/span><br \/>\n    <span class=\"token keyword\">private<\/span> <span class=\"token class-name\">Book<\/span><span class=\"token punctuation\">[<\/span><span class=\"token punctuation\">]<\/span> books <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">Book<\/span><span class=\"token punctuation\">[<\/span><span class=\"token number\">10<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token comment\">\/\/\u8bb0\u5f55\u76ee\u524d\u5b9e\u9645\u5b58\u653e\u7684 \u4e66\u7684\u4e2a\u6570<\/span><br \/>\n    <span class=\"token keyword\">private<\/span> <span class=\"token keyword\">int<\/span> used<span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token keyword\">public<\/span> <span class=\"token keyword\">int<\/span> <span class=\"token function\">getUsed<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token keyword\">return<\/span> used<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\">setUsed<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">int<\/span> used<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token keyword\">this<\/span><span class=\"token punctuation\">.<\/span>used <span class=\"token operator\">&#061;<\/span> used<span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><\/p>\n<p>    <span class=\"token comment\">\/\/\u83b7\u53d6\u4e66\u7684\u5c5e\u6027<\/span><br \/>\n    <span class=\"token keyword\">public<\/span> <span class=\"token class-name\">Book<\/span> <span class=\"token function\">getBooks<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">int<\/span> pos<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token keyword\">return<\/span> books<span class=\"token punctuation\">[<\/span>pos<span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n    <span class=\"token comment\">\/\/\u8bbe\u7f6e\u4e66\u7684\u5c5e\u6027<\/span><br \/>\n    <span class=\"token keyword\">public<\/span> <span class=\"token keyword\">void<\/span> <span class=\"token function\">setBooks<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">int<\/span> pos<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        books<span class=\"token punctuation\">[<\/span>pos<span class=\"token punctuation\">]<\/span> <span class=\"token operator\">&#061;<\/span> book<span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><\/p>\n<p>    <span class=\"token comment\">\/\/\u4e66\u67b6\u4e0a\u539f\u6709\u4e66\u7c4d<\/span><br \/>\n    <span class=\"token keyword\">public<\/span> <span class=\"token class-name\">BookList<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token comment\">\/\/\u6784\u9020\u65b9\u6cd5&#xff0c;\u521d\u59cb\u5316\u6210\u5458<\/span><br \/>\n        <span class=\"token keyword\">this<\/span><span class=\"token punctuation\">.<\/span>books<span class=\"token punctuation\">[<\/span><span class=\"token number\">0<\/span><span class=\"token punctuation\">]<\/span> <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">Book<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;\u4e09\u56fd\u6f14\u4e49&#034;<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token string\">&#034;\u7f57\u8d2f\u4e2d&#034;<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">25.8<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token string\">&#034;\u6587\u5b66\u8457\u4f5c&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">this<\/span><span class=\"token punctuation\">.<\/span>books<span class=\"token punctuation\">[<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">]<\/span> <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">Book<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;\u897f\u6e38\u8bb0&#034;<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token string\">&#034;\u5434\u627f\u6069&#034;<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">32.6<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token string\">&#034;\u6587\u5b66\u8457\u4f5c&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">this<\/span><span class=\"token punctuation\">.<\/span>books<span class=\"token punctuation\">[<\/span><span class=\"token number\">2<\/span><span class=\"token punctuation\">]<\/span> <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">Book<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;\u6c34\u6d52\u4f20&#034;<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token string\">&#034;\u65bd\u8010\u5eb5\u3001\u7f57\u8d2f\u4e2d&#034;<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">36.4<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token string\">&#034;\u6587\u5b66\u8457\u4f5c&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">this<\/span><span class=\"token punctuation\">.<\/span>books<span class=\"token punctuation\">[<\/span><span class=\"token number\">3<\/span><span class=\"token punctuation\">]<\/span> <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">Book<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;\u7ea2\u697c\u68a6&#034;<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token string\">&#034;\u66f9\u96ea\u82b9&#034;<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">28.6<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token string\">&#034;\u6587\u5b66\u8457\u4f5c&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">this<\/span><span class=\"token punctuation\">.<\/span>used <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">4<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p>\u5728BookList\u8fd9\u4e2a\u7c7b\u4e2d&#xff0c;\u6211\u4eec\u5b9a\u4e49\u4e00\u4e2aused\u53d8\u91cf&#xff0c;\u7528\u4e8e\u8bb0\u5f55\u5f53\u524d\u4e66\u67b6\u4e0a\u5b58\u5728\u51e0\u672c\u4e66&#xff1b;\u5728\u6784\u9020\u65b9\u6cd5\u4e2d&#xff0c;\u6211\u4eec\u63d0\u4f9b\u4e86\u56db\u672c\u4e66\u7c4d&#xff0c;\u53ea\u8981\u8c03\u7528\u6784\u9020\u65b9\u6cd5&#xff0c;\u5c31\u4f1a\u521d\u59cb\u5316\u8fd9\u56db\u672c\u4e66\u3002<\/p>\n<h3>3.\u8eab\u4efd<\/h3>\n<p>\u5728\u8eab\u4efd\u9009\u62e9\u4e0a&#xff0c;\u6211\u4eec\u63d0\u4f9b\u4e86\u4e24\u79cd&#xff0c;\u4e00\u79cd\u662f\u7ba1\u7406\u5458&#xff0c;\u4e00\u79cd\u662f\u666e\u901a\u7528\u6237&#xff1b;\u6839\u636e\u9009\u62e9\u7684\u8eab\u4efd\u4e0d\u540c&#xff0c;\u770b\u5230\u7684\u754c\u9762\u4e5f\u5c31\u4e0d\u540c\u3002\u65e0\u8bba\u662f\u7ba1\u7406\u5458\u8fd8\u662f\u666e\u901a\u7528\u6237&#xff0c;\u90fd\u6709\u8bb8\u591a\u76f8\u4f3c\u7684\u64cd\u4f5c&#xff0c;\u56e0\u6b64\u6211\u4eec\u4f7f\u7528\u7ee7\u627f\u601d\u60f3\u6765\u5b9e\u73b0\u8fd9\u4e24\u79cd\u8eab\u4efd\u3002<\/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\">User<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">public<\/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\">IOperation<\/span><span class=\"token punctuation\">[<\/span><span class=\"token punctuation\">]<\/span> iOperations<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 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><br \/>\n    <span class=\"token keyword\">public<\/span> <span class=\"token keyword\">abstract<\/span> <span class=\"token keyword\">int<\/span> <span class=\"token function\">menu<\/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\">doOperation<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">int<\/span> choice<span class=\"token punctuation\">,<\/span> <span class=\"token class-name\">BookList<\/span> bookList<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        iOperations<span class=\"token punctuation\">[<\/span>choice<span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">work<\/span><span class=\"token punctuation\">(<\/span>bookList<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>\u7ba1\u7406\u5458&#xff1a;<\/p>\n<p><span class=\"token keyword\">public<\/span> <span class=\"token keyword\">class<\/span> <span class=\"token class-name\">Admin<\/span> <span class=\"token keyword\">extends<\/span> <span class=\"token class-name\">User<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">public<\/span> <span class=\"token class-name\">Admin<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">String<\/span> name<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token keyword\">super<\/span><span class=\"token punctuation\">(<\/span>name<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token comment\">\/\/\u6839\u636e\u4e0b\u6807\u5b58\u653e\u64cd\u4f5c<\/span><br \/>\n        <span class=\"token keyword\">this<\/span><span class=\"token punctuation\">.<\/span>iOperations <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">IOperation<\/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\">Exit<\/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\">Find<\/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\">Add<\/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\">Del<\/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\">Show<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><br \/>\n        <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\">int<\/span> <span class=\"token function\">menu<\/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;****************************************&#034;<\/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;\u60a8\u597d&#xff0c;&#034;<\/span> <span class=\"token operator\">&#043;<\/span> <span class=\"token keyword\">this<\/span><span class=\"token punctuation\">.<\/span>name <span class=\"token operator\">&#043;<\/span> <span class=\"token string\">&#034;\u7ba1\u7406\u5458&#xff0c;\u8bf7\u9009\u62e9\u60a8\u7684\u64cd\u4f5c&#xff1a;&#034;<\/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;1.\u67e5\u627e\u56fe\u4e66&#034;<\/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;2.\u65b0\u589e\u56fe\u4e66&#034;<\/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;3.\u5220\u9664\u56fe\u4e66&#034;<\/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;4.\u663e\u793a\u56fe\u4e66&#034;<\/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;0.\u9000\u51fa\u7cfb\u7edf&#034;<\/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;****************************************&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token class-name\">Scanner<\/span> scanner <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">Scanner<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">System<\/span><span class=\"token punctuation\">.<\/span>in<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">int<\/span> choice <span class=\"token operator\">&#061;<\/span> scanner<span class=\"token punctuation\">.<\/span><span class=\"token function\">nextInt<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">return<\/span> choice<span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p>\u666e\u901a\u7528\u6237&#xff1a;<\/p>\n<p><span class=\"token keyword\">public<\/span> <span class=\"token keyword\">class<\/span> <span class=\"token class-name\">Normal<\/span> <span class=\"token keyword\">extends<\/span> <span class=\"token class-name\">User<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">public<\/span> <span class=\"token class-name\">Normal<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">String<\/span> name<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token keyword\">super<\/span><span class=\"token punctuation\">(<\/span>name<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">this<\/span><span class=\"token punctuation\">.<\/span>iOperations <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">IOperation<\/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\">Exit<\/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\">Find<\/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\">Borrowed<\/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\">Return<\/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 \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n    <span class=\"token keyword\">public<\/span> <span class=\"token keyword\">int<\/span> <span class=\"token function\">menu<\/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;****************************************&#034;<\/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;\u60a8\u597d&#xff0c;&#034;<\/span> <span class=\"token operator\">&#043;<\/span> <span class=\"token keyword\">this<\/span><span class=\"token punctuation\">.<\/span>name <span class=\"token operator\">&#043;<\/span> <span class=\"token string\">&#034;\u7528\u6237&#xff0c;\u8bf7\u9009\u62e9\u60a8\u7684\u64cd\u4f5c&#xff1a;&#034;<\/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;1.\u67e5\u627e\u56fe\u4e66&#034;<\/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;2.\u501f\u9605\u56fe\u4e66&#034;<\/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;3.\u5f52\u8fd8\u56fe\u4e66&#034;<\/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;0.\u9000\u51fa\u7cfb\u7edf&#034;<\/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;****************************************&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token class-name\">Scanner<\/span> scanner <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">Scanner<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">System<\/span><span class=\"token punctuation\">.<\/span>in<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">int<\/span> choice <span class=\"token operator\">&#061;<\/span> scanner<span class=\"token punctuation\">.<\/span><span class=\"token function\">nextInt<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">return<\/span> choice<span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p>\u5728\u8c03\u7528menu\u65b9\u6cd5\u65f6&#xff0c;\u4f7f\u7528\u4e86\u52a8\u6001\u7ed1\u5b9a\u7684\u601d\u60f3&#xff0c;\u56e0\u4e3a\u5b50\u7c7b\u4e2d\u90fd\u9700\u8981\u5bf9menu\u65b9\u6cd5\u8fdb\u884c\u91cd\u5199&#xff0c;\u6240\u4ee5\u7236\u7c7b\u4e2d\u4e0d\u7528\u5b9e\u73b0menu\u65b9\u6cd5&#xff0c;\u6240\u4ee5\u5c06User\u8bbe\u7f6e\u4e3a\u62bd\u8c61\u7c7b\u3002<\/p>\n<h3>4.\u64cd\u4f5c<\/h3>\n<p>\u5bf9\u4e8e\u4e0d\u540c\u8eab\u4efd\u7684\u5404\u79cd\u64cd\u4f5c&#xff0c;\u6211\u4eec\u5b9a\u4e49\u4e00\u4e2a\u63a5\u53e3&#xff0c;\u901a\u8fc7\u5b9e\u73b0\u63a5\u53e3\u5b8c\u6210\u7c7b\u7684\u5b9a\u4e49&#xff1a;<\/p>\n<p><span class=\"token keyword\">public<\/span> <span class=\"token keyword\">interface<\/span> <span class=\"token class-name\">IOperation<\/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 class-name\">BookList<\/span> bookList<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<h4>4.1 \u663e\u793a\u56fe\u4e66<\/h4>\n<p>\u4f7f\u7528for\u5faa\u73af\u83b7\u53d6\u4e66\u67b6\u4e0a\u7684\u4e66\u5373\u53ef&#xff1a;<\/p>\n<p><span class=\"token keyword\">public<\/span> <span class=\"token keyword\">class<\/span> <span class=\"token class-name\">Show<\/span> <span class=\"token keyword\">implements<\/span> <span class=\"token class-name\">IOperation<\/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\">work<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">BookList<\/span> bookList<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;\u663e\u793a\u56fe\u4e66&#034;<\/span><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 keyword\">int<\/span> i <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">;<\/span> i <span class=\"token operator\">&lt;<\/span> bookList<span class=\"token punctuation\">.<\/span><span class=\"token function\">getUsed<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span> i<span class=\"token operator\">&#043;&#043;<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n            <span class=\"token class-name\">Book<\/span> book <span class=\"token operator\">&#061;<\/span> bookList<span class=\"token punctuation\">.<\/span><span class=\"token function\">getBooks<\/span><span class=\"token punctuation\">(<\/span>i<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token comment\">\/\/\u6253\u5370 \u5f15\u7528\u7684\u4fe1\u606f&#xff0c;\u91cd\u5199toString\u65b9\u6cd5<\/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>book<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<h4>4.2 \u5220\u9664\u56fe\u4e66<\/h4>\n<p><span class=\"token keyword\">public<\/span> <span class=\"token keyword\">class<\/span> <span class=\"token class-name\">Del<\/span> <span class=\"token keyword\">implements<\/span> <span class=\"token class-name\">IOperation<\/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\">work<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">BookList<\/span> bookList<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;\u5220\u9664\u56fe\u4e66&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>        <span class=\"token keyword\">int<\/span> current <span class=\"token operator\">&#061;<\/span> bookList<span class=\"token punctuation\">.<\/span><span class=\"token function\">getUsed<\/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>current <span class=\"token operator\">&#061;&#061;<\/span> <span class=\"token number\">0<\/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;\u4e66\u67b6\u4e3a\u7a7a&#xff01;&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token keyword\">return<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span><\/p>\n<p>        <span class=\"token class-name\">Scanner<\/span> scanner <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">Scanner<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">System<\/span><span class=\"token punctuation\">.<\/span>in<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;\u8bf7\u8f93\u5165\u4e66\u540d&#xff1a;&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token class-name\">String<\/span> name <span class=\"token operator\">&#061;<\/span> scanner<span class=\"token punctuation\">.<\/span><span class=\"token function\">nextLine<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>        <span class=\"token comment\">\/\/\u5bfb\u627e\u4e66\u67b6\u4e0a\u662f\u5426\u6709\u6b64\u4e66<\/span><br \/>\n        <span class=\"token keyword\">int<\/span> index <span class=\"token operator\">&#061;<\/span> <span class=\"token operator\">&#8211;<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">for<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token keyword\">int<\/span> i <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">;<\/span> i <span class=\"token operator\">&lt;<\/span> current<span class=\"token punctuation\">;<\/span> i<span class=\"token operator\">&#043;&#043;<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n            <span class=\"token class-name\">Book<\/span> book1 <span class=\"token operator\">&#061;<\/span> bookList<span class=\"token punctuation\">.<\/span><span class=\"token function\">getBooks<\/span><span class=\"token punctuation\">(<\/span>i<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>book1<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 function\">equals<\/span><span class=\"token punctuation\">(<\/span>name<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n                index <span class=\"token operator\">&#061;<\/span> i<span class=\"token punctuation\">;<\/span><br \/>\n                <span class=\"token keyword\">break<\/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\">if<\/span> <span class=\"token punctuation\">(<\/span>index <span class=\"token operator\">&#061;&#061;<\/span> <span class=\"token operator\">&#8211;<\/span><span class=\"token number\">1<\/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;\u60a8\u8981\u5220\u9664\u7684\u4e66\u4e0d\u5728\u4e66\u67b6\u4e0a&#xff01;&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token keyword\">return<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span><\/p>\n<p>        <span class=\"token comment\">\/\/current &#8211; 1:\u9632\u6b62\u8d8a\u754c<\/span><br \/>\n        <span class=\"token keyword\">for<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token keyword\">int<\/span> i <span class=\"token operator\">&#061;<\/span> index<span class=\"token punctuation\">;<\/span> i <span class=\"token operator\">&lt;<\/span> current <span class=\"token operator\">&#8211;<\/span> <span class=\"token number\">1<\/span><span class=\"token punctuation\">;<\/span> i<span class=\"token operator\">&#043;&#043;<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n            <span class=\"token class-name\">Book<\/span> book <span class=\"token operator\">&#061;<\/span> bookList<span class=\"token punctuation\">.<\/span><span class=\"token function\">getBooks<\/span><span class=\"token punctuation\">(<\/span>i <span class=\"token operator\">&#043;<\/span> <span class=\"token number\">1<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            bookList<span class=\"token punctuation\">.<\/span><span class=\"token function\">setBooks<\/span><span class=\"token punctuation\">(<\/span>i<span class=\"token punctuation\">,<\/span> book<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <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;\u5220\u9664\u6210\u529f&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>        bookList<span class=\"token punctuation\">.<\/span><span class=\"token function\">setUsed<\/span><span class=\"token punctuation\">(<\/span>current <span class=\"token operator\">&#8211;<\/span> <span class=\"token number\">1<\/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>\u5bf9\u4e8e\u5220\u9664\u56fe\u4e66\u8fd9\u4e2a\u64cd\u4f5c&#xff0c;\u6211\u4eec\u9700\u8981\u6ce8\u610f&#xff1a;\u4e66\u67b6\u4e0a\u662f\u5426\u8fd8\u6709\u4e66&#xff0c;\u6240\u8981\u5220\u9664\u7684\u4e66\u662f\u5426\u4e3a\u4e66\u67b6\u4e0a\u7684\u4e66&#xff0c;\u4ee5\u53ca\u5220\u9664\u5b8c\u4e66\u4e4b\u540e\u5c06used\u7684\u503c\u8fdb\u884c\u66f4\u65b0\u3002<\/p>\n<h4>4.3 \u501f\u9605\u56fe\u4e66<\/h4>\n<p><span class=\"token keyword\">public<\/span> <span class=\"token keyword\">class<\/span> <span class=\"token class-name\">Borrowed<\/span> <span class=\"token keyword\">implements<\/span> <span class=\"token class-name\">IOperation<\/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\">work<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">BookList<\/span> bookList<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;\u501f\u9605\u56fe\u4e66&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>        <span class=\"token class-name\">Scanner<\/span> scanner <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">Scanner<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">System<\/span><span class=\"token punctuation\">.<\/span>in<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;\u8bf7\u8f93\u5165\u4e66\u540d&#xff1a;&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token class-name\">String<\/span> name <span class=\"token operator\">&#061;<\/span> scanner<span class=\"token punctuation\">.<\/span><span class=\"token function\">nextLine<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">int<\/span> current <span class=\"token operator\">&#061;<\/span> bookList<span class=\"token punctuation\">.<\/span><span class=\"token function\">getUsed<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>        <span class=\"token keyword\">for<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token keyword\">int<\/span> i <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">;<\/span> i <span class=\"token operator\">&lt;<\/span> current<span class=\"token punctuation\">;<\/span> i<span class=\"token operator\">&#043;&#043;<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n            <span class=\"token class-name\">Book<\/span> book1 <span class=\"token operator\">&#061;<\/span> bookList<span class=\"token punctuation\">.<\/span><span class=\"token function\">getBooks<\/span><span class=\"token punctuation\">(<\/span>i<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>book1<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 function\">equals<\/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\">if<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token operator\">!<\/span>book1<span class=\"token punctuation\">.<\/span><span class=\"token function\">isBorrowed<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n                    book1<span class=\"token punctuation\">.<\/span><span class=\"token function\">setBorrowed<\/span><span class=\"token punctuation\">(<\/span><span class=\"token boolean\">true<\/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;\u501f\u9605\u6210\u529f&#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 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;\u6b64\u4e66\u5df2\u501f\u51fa&#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\">return<\/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 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;\u67e5\u65e0\u6b64\u4e66&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p>\u5728\u7f16\u5199\u501f\u9605\u56fe\u4e66\u7684\u4ee3\u7801\u65f6&#xff0c;\u6211\u4eec\u9700\u8981\u8003\u8651\u5230\u4e66\u5df2\u7ecf\u88ab\u501f\u51fa\u7684\u60c5\u51b5&#xff0c;\u4ee5\u53ca\u9700\u8981\u501f\u9605\u7684\u4e66\u662f\u5426\u4e3a\u4e66\u67b6\u4e0a\u7684\u4e66\u3002<\/p>\n<h4>4.4 \u65b0\u589e\u56fe\u4e66<\/h4>\n<p><span class=\"token keyword\">public<\/span> <span class=\"token keyword\">class<\/span> <span class=\"token class-name\">Add<\/span> <span class=\"token keyword\">implements<\/span> <span class=\"token class-name\">IOperation<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">public<\/span> <span class=\"token keyword\">void<\/span> <span class=\"token function\">work<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">BookList<\/span> bookList<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;\u65b0\u589e\u56fe\u4e66&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token class-name\">Scanner<\/span> scanner <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">Scanner<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">System<\/span><span class=\"token punctuation\">.<\/span>in<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;\u8bf7\u8f93\u5165\u4e66\u540d&#xff1a;&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token class-name\">String<\/span> name <span class=\"token operator\">&#061;<\/span> scanner<span class=\"token punctuation\">.<\/span><span class=\"token function\">nextLine<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>        <span class=\"token keyword\">int<\/span> current <span class=\"token operator\">&#061;<\/span> bookList<span class=\"token punctuation\">.<\/span><span class=\"token function\">getUsed<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>        <span class=\"token comment\">\/\/\u5224\u65ad\u4e66\u67b6\u662f\u5426\u5df2\u5b58\u5728\u6b64\u4e66<\/span><br \/>\n        <span class=\"token keyword\">for<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token keyword\">int<\/span> i <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">;<\/span> i <span class=\"token operator\">&lt;<\/span> current<span class=\"token punctuation\">;<\/span> i<span class=\"token operator\">&#043;&#043;<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n            <span class=\"token class-name\">Book<\/span> book1 <span class=\"token operator\">&#061;<\/span> bookList<span class=\"token punctuation\">.<\/span><span class=\"token function\">getBooks<\/span><span class=\"token punctuation\">(<\/span>i<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>book1<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 function\">equals<\/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 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;\u4e66\u67b6\u5df2\u5b58\u5728\u6b64\u4e66&#xff0c;\u8bf7\u52ff\u91cd\u590d\u5b58\u653e&#xff01;&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n                <span class=\"token keyword\">return<\/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 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;\u8bf7\u8f93\u5165\u4f5c\u8005&#xff1a;&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token class-name\">String<\/span> author <span class=\"token operator\">&#061;<\/span> scanner<span class=\"token punctuation\">.<\/span><span class=\"token function\">nextLine<\/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;\u8bf7\u8f93\u5165\u4ef7\u683c&#xff1a;&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">double<\/span> price <span class=\"token operator\">&#061;<\/span> scanner<span class=\"token punctuation\">.<\/span><span class=\"token function\">nextDouble<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        scanner<span class=\"token punctuation\">.<\/span><span class=\"token function\">nextLine<\/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;\u8bf7\u8f93\u5165\u7c7b\u578b&#xff1a;&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token class-name\">String<\/span> type <span class=\"token operator\">&#061;<\/span> scanner<span class=\"token punctuation\">.<\/span><span class=\"token function\">nextLine<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>        <span class=\"token class-name\">Book<\/span> book <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">Book<\/span><span class=\"token punctuation\">(<\/span>name<span class=\"token punctuation\">,<\/span> author<span class=\"token punctuation\">,<\/span> price<span class=\"token punctuation\">,<\/span> type<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>        bookList<span class=\"token punctuation\">.<\/span><span class=\"token function\">setBooks<\/span><span class=\"token punctuation\">(<\/span>current<span class=\"token punctuation\">,<\/span> book<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        bookList<span class=\"token punctuation\">.<\/span><span class=\"token function\">setUsed<\/span><span class=\"token punctuation\">(<\/span>current<span class=\"token operator\">&#043;<\/span><span class=\"token number\">1<\/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;\u65b0\u589e\u6210\u529f&#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>\u5728\u65b0\u589e\u56fe\u4e66\u65f6&#xff0c;\u6211\u4eec\u9700\u8981\u5148\u5224\u65ad\u4e66\u67b6\u4e0a\u662f\u5426\u5b58\u5728\u6b64\u4e66&#xff0c;\u5982\u679c\u5b58\u5728&#xff0c;\u5219\u65e0\u9700\u6dfb\u52a0\u6b64\u4e66&#xff08;\u4ee5\u4e66\u540d\u4e3a\u5224\u65ad\u6807\u51c6&#xff09;\u3002<\/p>\n<h4>4.5 \u67e5\u627e\u56fe\u4e66<\/h4>\n<p><span class=\"token keyword\">public<\/span> <span class=\"token keyword\">class<\/span> <span class=\"token class-name\">Find<\/span> <span class=\"token keyword\">implements<\/span> <span class=\"token class-name\">IOperation<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">public<\/span> <span class=\"token keyword\">void<\/span> <span class=\"token function\">work<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">BookList<\/span> bookList<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;\u67e5\u627e\u56fe\u4e66&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token class-name\">Scanner<\/span> scanner <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">Scanner<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">System<\/span><span class=\"token punctuation\">.<\/span>in<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;\u8bf7\u8f93\u5165\u60a8\u8981\u67e5\u627e\u7684\u56fe\u4e66&#xff1a;&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token class-name\">String<\/span> name <span class=\"token operator\">&#061;<\/span> scanner<span class=\"token punctuation\">.<\/span><span class=\"token function\">nextLine<\/span><span class=\"token punctuation\">(<\/span><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 keyword\">int<\/span> i <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">;<\/span> i <span class=\"token operator\">&lt;<\/span> bookList<span class=\"token punctuation\">.<\/span><span class=\"token function\">getUsed<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span> i<span class=\"token operator\">&#043;&#043;<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n            <span class=\"token class-name\">Book<\/span> book <span class=\"token operator\">&#061;<\/span> bookList<span class=\"token punctuation\">.<\/span><span class=\"token function\">getBooks<\/span><span class=\"token punctuation\">(<\/span>i<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>book<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 function\">equals<\/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 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;\u5b58\u5728\u6b64\u4e66&#xff1a;&#034;<\/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>book<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n                <span class=\"token keyword\">return<\/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 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;\u67e5\u65e0\u6b64\u4e66&#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>\u5728\u67e5\u627e\u56fe\u4e66\u65f6&#xff0c;\u6211\u4eec\u6839\u636e\u4e66\u540d\u8fdb\u884c\u67e5\u627e&#xff1b;\u4f7f\u7528for\u5faa\u73af\u904d\u5386\u4e66\u67b6\u4e0a\u7684\u4e66&#xff0c;\u5224\u65ad\u4e66\u67b6\u4e0a\u4e66\u7684\u540d\u5b57\u548c\u6211\u4eec\u8981\u67e5\u627e\u7684\u4e66\u540d\u662f\u5426\u76f8\u540c\u3002<\/p>\n<h4>4.6 \u5f52\u8fd8\u56fe\u4e66<\/h4>\n<p><span class=\"token keyword\">public<\/span> <span class=\"token keyword\">class<\/span> <span class=\"token class-name\">Return<\/span> <span class=\"token keyword\">implements<\/span> <span class=\"token class-name\">IOperation<\/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\">work<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">BookList<\/span> bookList<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;\u5f52\u8fd8\u56fe\u4e66&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>        <span class=\"token class-name\">Scanner<\/span> scanner <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">Scanner<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">System<\/span><span class=\"token punctuation\">.<\/span>in<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;\u8bf7\u8f93\u5165\u4e66\u540d&#xff1a;&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token class-name\">String<\/span> name <span class=\"token operator\">&#061;<\/span> scanner<span class=\"token punctuation\">.<\/span><span class=\"token function\">nextLine<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>        <span class=\"token keyword\">int<\/span> current <span class=\"token operator\">&#061;<\/span> bookList<span class=\"token punctuation\">.<\/span><span class=\"token function\">getUsed<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>        <span class=\"token keyword\">for<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token keyword\">int<\/span> i <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">;<\/span> i <span class=\"token operator\">&lt;<\/span> current<span class=\"token punctuation\">;<\/span> i<span class=\"token operator\">&#043;&#043;<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n            <span class=\"token class-name\">Book<\/span> book1 <span class=\"token operator\">&#061;<\/span> bookList<span class=\"token punctuation\">.<\/span><span class=\"token function\">getBooks<\/span><span class=\"token punctuation\">(<\/span>i<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>book1<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 function\">equals<\/span><span class=\"token punctuation\">(<\/span>name<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n                book1<span class=\"token punctuation\">.<\/span><span class=\"token function\">setBorrowed<\/span><span class=\"token punctuation\">(<\/span><span class=\"token boolean\">false<\/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;\u5f52\u8fd8\u6210\u529f&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n                <span class=\"token keyword\">return<\/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 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;\u6b64\u4e66\u4e0d\u5c5e\u4e8e\u4e66\u67b6&#xff0c;\u65e0\u9700\u5f52\u8fd8&#xff01;&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p>\u5f52\u8fd8\u56fe\u4e66\u65f6&#xff0c;\u9700\u5224\u65ad\u6b64\u4e66\u662f\u5426\u4e3a\u4e66\u67b6\u4e0a\u7684\u4e66&#xff0c;\u5982\u679c\u4e0d\u662f&#xff0c;\u5219\u4e0d\u7528\u5f52\u8fd8\u3002\u4f9d\u65e7\u4f7f\u7528for\u5faa\u73af\u904d\u5386\u4e66\u67b6\u4e0a\u7684\u4e66&#xff0c;\u5224\u65ad\u4e66\u67b6\u4e0a\u4e66\u7684\u540d\u5b57\u548c\u6211\u4eec\u8981\u5f52\u8fd8\u7684\u4e66\u540d\u662f\u5426\u76f8\u540c&#xff0c;\u5982\u679c\u76f8\u540c&#xff0c;\u5219\u6b64\u4e66\u5f52\u8fd8\u6210\u529f&#xff0c;\u5c31\u5c06\u6b64\u4e66\u8bbe\u7f6e\u4e3a\u672a\u88ab\u501f\u51fa\u3002<\/p>\n<h4>4.7 \u9000\u51fa\u7cfb\u7edf<\/h4>\n<p><span class=\"token keyword\">public<\/span> <span class=\"token keyword\">class<\/span> <span class=\"token class-name\">Exit<\/span> <span class=\"token keyword\">implements<\/span> <span class=\"token class-name\">IOperation<\/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\">work<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">BookList<\/span> bookList<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;\u9000\u51fa\u7cfb\u7edf&#034;<\/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><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<h2>\u4e09\u3001\u4ea4\u4e92<\/h2>\n<p>\u7f16\u5199\u5b8c\u5404\u4e2a\u90e8\u5206\u7684\u4ee3\u7801\u4e4b\u540e&#xff0c;\u5c06\u5b83\u4eec\u8054\u7cfb\u8d77\u6765\u624d\u662f\u91cd\u70b9&#xff1a;<\/p>\n<p><span class=\"token keyword\">public<\/span> <span class=\"token keyword\">class<\/span> <span class=\"token class-name\">Main<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token comment\">\/\/\u5229\u7528\u5411\u4e0a\u8f6c\u578b<\/span><br \/>\n    <span class=\"token keyword\">public<\/span> <span class=\"token keyword\">static<\/span> <span class=\"token class-name\">User<\/span> <span class=\"token function\">login<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token class-name\">Scanner<\/span> scanner <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">Scanner<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">System<\/span><span class=\"token punctuation\">.<\/span>in<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;\u60a8\u597d&#xff0c;\u8bf7\u8f93\u5165\u60a8\u7684\u59d3\u540d&#xff1a;&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token class-name\">String<\/span> name <span class=\"token operator\">&#061;<\/span> scanner<span class=\"token punctuation\">.<\/span><span class=\"token function\">nextLine<\/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;\u8bf7\u8f93\u5165\u60a8\u7684\u8eab\u4efd&#xff1a;1.\u56fe\u4e66\u7ba1\u7406\u5458\/0.\u666e\u901a\u7528\u6237&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">int<\/span> choice <span class=\"token operator\">&#061;<\/span> scanner<span class=\"token punctuation\">.<\/span><span class=\"token function\">nextInt<\/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>choice <span class=\"token operator\">&#061;&#061;<\/span> <span class=\"token number\">1<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n            <span class=\"token class-name\">Admin<\/span> admin <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">Admin<\/span><span class=\"token punctuation\">(<\/span>name<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token keyword\">return<\/span> admin<span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span> <span class=\"token keyword\">else<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n            <span class=\"token class-name\">Normal<\/span> normal <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">Normal<\/span><span class=\"token punctuation\">(<\/span>name<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token keyword\">return<\/span> normal<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\">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\">BookList<\/span> bookList <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">BookList<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span> <span class=\"token comment\">\/\/\u4e66\u67b6\u4e0a\u539f\u6709\u4e66\u7c4d\u88ab\u521d\u59cb\u5316\u597d\u4e86<\/span><\/p>\n<p>        <span class=\"token class-name\">User<\/span> user <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">login<\/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><span class=\"token boolean\">true<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n            <span class=\"token comment\">\/\/\u52a8\u6001\u7ed1\u5b9a<\/span><br \/>\n            <span class=\"token keyword\">int<\/span> choice <span class=\"token operator\">&#061;<\/span> user<span class=\"token punctuation\">.<\/span><span class=\"token function\">menu<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token comment\">\/\/\u4ee5\u4e0a\u4e24\u6761\u8bed\u53e5&#xff0c;\u53ef\u4ee5\u5224\u65ad&#xff1a;\u8eab\u4efd\u548c\u9009\u62e9\u7684\u64cd\u4f5c<\/span><\/p>\n<p>            <span class=\"token comment\">\/\/System.out.println(choice); \/\/\u6b63\u5e38\u63a5\u6536\u8fd4\u56de\u503c<\/span><br \/>\n            <span class=\"token comment\">\/\/System.out.println(user); \/\/\u901a\u8fc7\u52a8\u6001\u7ed1\u5b9a\u786e\u5b9a\u8eab\u4efd<\/span><\/p>\n<p>            <span class=\"token comment\">\/**<br \/>\n             * \u83b7\u53d6\u5230\u8eab\u4efd\u548c\u64cd\u4f5c\u4e4b\u540e&#xff0c;\u600e\u4e48\u5efa\u7acb\u8054\u7cfb\u5462&#xff1f;<br \/>\n             *\/<\/span><br \/>\n            user<span class=\"token punctuation\">.<\/span><span class=\"token function\">doOperation<\/span><span class=\"token punctuation\">(<\/span>choice<span class=\"token punctuation\">,<\/span> bookList<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><img decoding=\"async\" src=\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2025\/07\/20250730061901-6889b95591198.png\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\" \/><\/p>\n<hr \/>\n<p>Ending\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u6587\u7ae0\u6d4f\u89c8\u9605\u8bfb1k\u6b21\uff0c\u70b9\u8d5e35\u6b21\uff0c\u6536\u85cf10\u6b21\u3002\u56fe\u4e66\u5c0f\u7cfb\u7edf<\/p>\n","protected":false},"author":2,"featured_media":48978,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[99,190,4742],"topic":[],"class_list":["post-48981","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-server","tag-java","tag-190"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v20.3 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>\u96f6\u57fa\u7840 \u201c\u5165\u5751\u201d Java- \u5341\u56db\u3001\u3010\u7ec3\u4e60\u3011\u56fe\u4e66\u5c0f\u7cfb\u7edf - \u7f51\u7855\u4e92\u8054\u5e2e\u52a9\u4e2d\u5fc3<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.wsisp.com\/helps\/48981.html\" \/>\n<meta property=\"og:locale\" content=\"zh_CN\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"\u96f6\u57fa\u7840 \u201c\u5165\u5751\u201d Java- \u5341\u56db\u3001\u3010\u7ec3\u4e60\u3011\u56fe\u4e66\u5c0f\u7cfb\u7edf - \u7f51\u7855\u4e92\u8054\u5e2e\u52a9\u4e2d\u5fc3\" \/>\n<meta property=\"og:description\" content=\"\u6587\u7ae0\u6d4f\u89c8\u9605\u8bfb1k\u6b21\uff0c\u70b9\u8d5e35\u6b21\uff0c\u6536\u85cf10\u6b21\u3002\u56fe\u4e66\u5c0f\u7cfb\u7edf\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.wsisp.com\/helps\/48981.html\" \/>\n<meta property=\"og:site_name\" content=\"\u7f51\u7855\u4e92\u8054\u5e2e\u52a9\u4e2d\u5fc3\" \/>\n<meta property=\"article:published_time\" content=\"2025-07-30T06:19:03+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2025\/07\/20250730061901-6889b95502058.png\" \/>\n<meta name=\"author\" content=\"admin\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"\u4f5c\u8005\" \/>\n\t<meta name=\"twitter:data1\" content=\"admin\" \/>\n\t<meta name=\"twitter:label2\" content=\"\u9884\u8ba1\u9605\u8bfb\u65f6\u95f4\" \/>\n\t<meta name=\"twitter:data2\" content=\"5 \u5206\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"WebPage\",\"@id\":\"https:\/\/www.wsisp.com\/helps\/48981.html\",\"url\":\"https:\/\/www.wsisp.com\/helps\/48981.html\",\"name\":\"\u96f6\u57fa\u7840 \u201c\u5165\u5751\u201d Java- \u5341\u56db\u3001\u3010\u7ec3\u4e60\u3011\u56fe\u4e66\u5c0f\u7cfb\u7edf - \u7f51\u7855\u4e92\u8054\u5e2e\u52a9\u4e2d\u5fc3\",\"isPartOf\":{\"@id\":\"https:\/\/www.wsisp.com\/helps\/#website\"},\"datePublished\":\"2025-07-30T06:19:03+00:00\",\"dateModified\":\"2025-07-30T06:19:03+00:00\",\"author\":{\"@id\":\"https:\/\/www.wsisp.com\/helps\/#\/schema\/person\/358e386c577a3ab51c4493330a20ad41\"},\"breadcrumb\":{\"@id\":\"https:\/\/www.wsisp.com\/helps\/48981.html#breadcrumb\"},\"inLanguage\":\"zh-Hans\",\"potentialAction\":[{\"@type\":\"ReadAction\",\"target\":[\"https:\/\/www.wsisp.com\/helps\/48981.html\"]}]},{\"@type\":\"BreadcrumbList\",\"@id\":\"https:\/\/www.wsisp.com\/helps\/48981.html#breadcrumb\",\"itemListElement\":[{\"@type\":\"ListItem\",\"position\":1,\"name\":\"\u9996\u9875\",\"item\":\"https:\/\/www.wsisp.com\/helps\"},{\"@type\":\"ListItem\",\"position\":2,\"name\":\"\u96f6\u57fa\u7840 \u201c\u5165\u5751\u201d Java--- \u5341\u56db\u3001\u3010\u7ec3\u4e60\u3011\u56fe\u4e66\u5c0f\u7cfb\u7edf\"}]},{\"@type\":\"WebSite\",\"@id\":\"https:\/\/www.wsisp.com\/helps\/#website\",\"url\":\"https:\/\/www.wsisp.com\/helps\/\",\"name\":\"\u7f51\u7855\u4e92\u8054\u5e2e\u52a9\u4e2d\u5fc3\",\"description\":\"\u9999\u6e2f\u670d\u52a1\u5668_\u9999\u6e2f\u4e91\u670d\u52a1\u5668\u8d44\u8baf_\u670d\u52a1\u5668\u5e2e\u52a9\u6587\u6863_\u670d\u52a1\u5668\u6559\u7a0b\",\"potentialAction\":[{\"@type\":\"SearchAction\",\"target\":{\"@type\":\"EntryPoint\",\"urlTemplate\":\"https:\/\/www.wsisp.com\/helps\/?s={search_term_string}\"},\"query-input\":\"required name=search_term_string\"}],\"inLanguage\":\"zh-Hans\"},{\"@type\":\"Person\",\"@id\":\"https:\/\/www.wsisp.com\/helps\/#\/schema\/person\/358e386c577a3ab51c4493330a20ad41\",\"name\":\"admin\",\"image\":{\"@type\":\"ImageObject\",\"inLanguage\":\"zh-Hans\",\"@id\":\"https:\/\/www.wsisp.com\/helps\/#\/schema\/person\/image\/\",\"url\":\"https:\/\/gravatar.wp-china-yes.net\/avatar\/?s=96&d=mystery\",\"contentUrl\":\"https:\/\/gravatar.wp-china-yes.net\/avatar\/?s=96&d=mystery\",\"caption\":\"admin\"},\"sameAs\":[\"http:\/\/wp.wsisp.com\"],\"url\":\"https:\/\/www.wsisp.com\/helps\/author\/admin\"}]}<\/script>\n<!-- \/ Yoast SEO plugin. -->","yoast_head_json":{"title":"\u96f6\u57fa\u7840 \u201c\u5165\u5751\u201d Java- \u5341\u56db\u3001\u3010\u7ec3\u4e60\u3011\u56fe\u4e66\u5c0f\u7cfb\u7edf - \u7f51\u7855\u4e92\u8054\u5e2e\u52a9\u4e2d\u5fc3","robots":{"index":"index","follow":"follow","max-snippet":"max-snippet:-1","max-image-preview":"max-image-preview:large","max-video-preview":"max-video-preview:-1"},"canonical":"https:\/\/www.wsisp.com\/helps\/48981.html","og_locale":"zh_CN","og_type":"article","og_title":"\u96f6\u57fa\u7840 \u201c\u5165\u5751\u201d Java- \u5341\u56db\u3001\u3010\u7ec3\u4e60\u3011\u56fe\u4e66\u5c0f\u7cfb\u7edf - \u7f51\u7855\u4e92\u8054\u5e2e\u52a9\u4e2d\u5fc3","og_description":"\u6587\u7ae0\u6d4f\u89c8\u9605\u8bfb1k\u6b21\uff0c\u70b9\u8d5e35\u6b21\uff0c\u6536\u85cf10\u6b21\u3002\u56fe\u4e66\u5c0f\u7cfb\u7edf","og_url":"https:\/\/www.wsisp.com\/helps\/48981.html","og_site_name":"\u7f51\u7855\u4e92\u8054\u5e2e\u52a9\u4e2d\u5fc3","article_published_time":"2025-07-30T06:19:03+00:00","og_image":[{"url":"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2025\/07\/20250730061901-6889b95502058.png"}],"author":"admin","twitter_card":"summary_large_image","twitter_misc":{"\u4f5c\u8005":"admin","\u9884\u8ba1\u9605\u8bfb\u65f6\u95f4":"5 \u5206"},"schema":{"@context":"https:\/\/schema.org","@graph":[{"@type":"WebPage","@id":"https:\/\/www.wsisp.com\/helps\/48981.html","url":"https:\/\/www.wsisp.com\/helps\/48981.html","name":"\u96f6\u57fa\u7840 \u201c\u5165\u5751\u201d Java- \u5341\u56db\u3001\u3010\u7ec3\u4e60\u3011\u56fe\u4e66\u5c0f\u7cfb\u7edf - \u7f51\u7855\u4e92\u8054\u5e2e\u52a9\u4e2d\u5fc3","isPartOf":{"@id":"https:\/\/www.wsisp.com\/helps\/#website"},"datePublished":"2025-07-30T06:19:03+00:00","dateModified":"2025-07-30T06:19:03+00:00","author":{"@id":"https:\/\/www.wsisp.com\/helps\/#\/schema\/person\/358e386c577a3ab51c4493330a20ad41"},"breadcrumb":{"@id":"https:\/\/www.wsisp.com\/helps\/48981.html#breadcrumb"},"inLanguage":"zh-Hans","potentialAction":[{"@type":"ReadAction","target":["https:\/\/www.wsisp.com\/helps\/48981.html"]}]},{"@type":"BreadcrumbList","@id":"https:\/\/www.wsisp.com\/helps\/48981.html#breadcrumb","itemListElement":[{"@type":"ListItem","position":1,"name":"\u9996\u9875","item":"https:\/\/www.wsisp.com\/helps"},{"@type":"ListItem","position":2,"name":"\u96f6\u57fa\u7840 \u201c\u5165\u5751\u201d Java--- \u5341\u56db\u3001\u3010\u7ec3\u4e60\u3011\u56fe\u4e66\u5c0f\u7cfb\u7edf"}]},{"@type":"WebSite","@id":"https:\/\/www.wsisp.com\/helps\/#website","url":"https:\/\/www.wsisp.com\/helps\/","name":"\u7f51\u7855\u4e92\u8054\u5e2e\u52a9\u4e2d\u5fc3","description":"\u9999\u6e2f\u670d\u52a1\u5668_\u9999\u6e2f\u4e91\u670d\u52a1\u5668\u8d44\u8baf_\u670d\u52a1\u5668\u5e2e\u52a9\u6587\u6863_\u670d\u52a1\u5668\u6559\u7a0b","potentialAction":[{"@type":"SearchAction","target":{"@type":"EntryPoint","urlTemplate":"https:\/\/www.wsisp.com\/helps\/?s={search_term_string}"},"query-input":"required name=search_term_string"}],"inLanguage":"zh-Hans"},{"@type":"Person","@id":"https:\/\/www.wsisp.com\/helps\/#\/schema\/person\/358e386c577a3ab51c4493330a20ad41","name":"admin","image":{"@type":"ImageObject","inLanguage":"zh-Hans","@id":"https:\/\/www.wsisp.com\/helps\/#\/schema\/person\/image\/","url":"https:\/\/gravatar.wp-china-yes.net\/avatar\/?s=96&d=mystery","contentUrl":"https:\/\/gravatar.wp-china-yes.net\/avatar\/?s=96&d=mystery","caption":"admin"},"sameAs":["http:\/\/wp.wsisp.com"],"url":"https:\/\/www.wsisp.com\/helps\/author\/admin"}]}},"_links":{"self":[{"href":"https:\/\/www.wsisp.com\/helps\/wp-json\/wp\/v2\/posts\/48981","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.wsisp.com\/helps\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.wsisp.com\/helps\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.wsisp.com\/helps\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/www.wsisp.com\/helps\/wp-json\/wp\/v2\/comments?post=48981"}],"version-history":[{"count":0,"href":"https:\/\/www.wsisp.com\/helps\/wp-json\/wp\/v2\/posts\/48981\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.wsisp.com\/helps\/wp-json\/wp\/v2\/media\/48978"}],"wp:attachment":[{"href":"https:\/\/www.wsisp.com\/helps\/wp-json\/wp\/v2\/media?parent=48981"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.wsisp.com\/helps\/wp-json\/wp\/v2\/categories?post=48981"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.wsisp.com\/helps\/wp-json\/wp\/v2\/tags?post=48981"},{"taxonomy":"topic","embeddable":true,"href":"https:\/\/www.wsisp.com\/helps\/wp-json\/wp\/v2\/topic?post=48981"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}