{"id":54217,"date":"2025-08-13T00:09:35","date_gmt":"2025-08-12T16:09:35","guid":{"rendered":"https:\/\/www.wsisp.com\/helps\/54217.html"},"modified":"2025-08-13T00:09:35","modified_gmt":"2025-08-12T16:09:35","slug":"%e9%9d%99%e6%80%81%e6%96%b9%e6%b3%95%e4%b8%8e%e5%ae%9e%e4%be%8b%e6%96%b9%e6%b3%95%ef%bc%9ajava-%e4%b8%ad%e7%9a%84-%e5%85%b1%e4%ba%ab%e5%b7%a5%e5%85%b7-%e4%b8%8e-%e4%b8%93","status":"publish","type":"post","link":"https:\/\/www.wsisp.com\/helps\/54217.html","title":{"rendered":"\u9759\u6001\u65b9\u6cd5\u4e0e\u5b9e\u4f8b\u65b9\u6cd5\uff1aJava \u4e2d\u7684 \u201c\u5171\u4eab\u5de5\u5177\u201c \u4e0e \u201c\u4e13\u5c5e\u52a9\u624b\u201c\u2014\u2014 \u90a3\u4e9b\u4e9b\u4f60\u5fc5\u987b\u77e5\u9053\u7684\u5751"},"content":{"rendered":"

\u76ee\u5f55<\/p>\n

\u4e00\u3001\u8bbf\u95ee\u6743\u9650\u7684 "\u695a\u6cb3\u6c49\u754c"：\u8c01\u80fd\u8bbf\u95ee\u8c01？<\/p>\n

1. \u9759\u6001\u65b9\u6cd5\u7684\u8bbf\u95ee\u9650\u5236：\u770b\u5f97\u89c1\u7684\u53ea\u6709 "\u516c\u5171\u533a\u57df"<\/p>\n

2. \u5b9e\u4f8b\u65b9\u6cd5\u7684\u8bbf\u95ee\u7279\u6743：\u516c\u79c1\u533a\u57df\u90fd\u80fd\u8fdb<\/p>\n

3. \u8bbf\u95ee\u89c4\u5219\u603b\u7ed3：\u4e00\u5f20\u8868\u770b\u6e05\u6743\u9650\u8fb9\u754c<\/p>\n

\u4e8c\u3001\u6700\u5bb9\u6613\u8e29\u7684 5 \u4e2a "\u8de8\u754c\u8bbf\u95ee" \u9677\u9631<\/p>\n

\u9677\u9631 1：\u5728\u9759\u6001\u65b9\u6cd5\u4e2d\u4f7f\u7528 this \u5173\u952e\u5b57<\/p>\n

\u9677\u9631 2：\u901a\u8fc7\u5bf9\u8c61\u8c03\u7528\u9759\u6001\u65b9\u6cd5<\/p>\n

\u9677\u9631 3：\u5b9e\u4f8b\u65b9\u6cd5\u8fc7\u5ea6\u4f9d\u8d56\u9759\u6001\u6210\u5458<\/p>\n

\u9677\u9631 4：\u9759\u6001\u65b9\u6cd5\u4e2d\u521b\u5efa\u8fc7\u591a\u5b9e\u4f8b\u5bf9\u8c61<\/p>\n

\u9677\u9631 5：\u6df7\u6dc6\u9759\u6001\u65b9\u6cd5\u4e0e\u5b9e\u4f8b\u65b9\u6cd5\u7684\u7ee7\u627f\u884c\u4e3a<\/p>\n

\u4e09\u3001\u9759\u6001\u65b9\u6cd5\u4e0e\u5b9e\u4f8b\u65b9\u6cd5\u7684\u9009\u62e9\u6307\u5357<\/p>\n

\u603b\u7ed3：\u7406\u89e3 "\u5171\u4eab" \u4e0e "\u4e13\u5c5e" \u7684\u672c\u8d28<\/p>\n

\n

\u5982\u679c\u628a Java \u7c7b\u6bd4\u4f5c\u4e00\u5bb6\u516c\u53f8，\u90a3\u4e48\u9759\u6001\u65b9\u6cd5\u5c31\u50cf\u662f\u516c\u53f8\u524d\u53f0\u7684\u516c\u5171\u6253\u5370\u673a（\u6240\u6709\u4eba\u5171\u4eab），\u800c\u5b9e\u4f8b\u65b9\u6cd5\u5219\u50cf\u662f\u6bcf\u4e2a\u5458\u5de5\u7684\u79c1\u4eba\u7535\u8111（\u4e13\u4eba\u4e13\u7528）\u3002\u5b83\u4eec\u5404\u6709\u5206\u5de5，\u5374\u4e5f\u5e38\u5e38\u56e0\u4e3a\u88ab\u8bef\u7528\u800c\u5f15\u53d1\u4e00\u7cfb\u5217\u95ee\u9898\u3002\u672c\u6587\u5c06\u7528\u751f\u6d3b\u5316\u7684\u6bd4\u55bb，\u6df1\u5165\u89e3\u6790\u9759\u6001\u65b9\u6cd5\u4e0e\u5b9e\u4f8b\u65b9\u6cd5\u5728\u8bbf\u95ee\u6743\u9650\u4e0a\u7684\u90a3\u4e9b "\u6f5c\u89c4\u5219"，\u4ee5\u53ca\u4f7f\u7528\u65f6\u5fc5\u987b\u8b66\u60d5\u7684\u9677\u9631\u3002<\/p>\n

\u4e00\u3001\u8bbf\u95ee\u6743\u9650\u7684 "\u695a\u6cb3\u6c49\u754c"：\u8c01\u80fd\u8bbf\u95ee\u8c01？<\/h3>\n

\u9759\u6001\u65b9\u6cd5\u4e0e\u5b9e\u4f8b\u65b9\u6cd5\u5728\u8bbf\u95ee\u6210\u5458\u65f6，\u6709\u7740\u4e25\u683c\u7684 "\u6743\u9650\u8fb9\u754c"，\u5c31\u50cf\u516c\u53f8\u7684\u95e8\u7981\u7cfb\u7edf \u2014\u2014 \u4e0d\u540c\u8eab\u4efd\u80fd\u8fdb\u5165\u7684\u533a\u57df\u622a\u7136\u4e0d\u540c\u3002<\/p>\n

1. \u9759\u6001\u65b9\u6cd5\u7684\u8bbf\u95ee\u9650\u5236：\u770b\u5f97\u89c1\u7684\u53ea\u6709 "\u516c\u5171\u533a\u57df"<\/h4>\n

\u9759\u6001\u65b9\u6cd5\u5c5e\u4e8e\u7c7b（\u516c\u53f8），\u5b83\u80fd\u76f4\u63a5\u8bbf\u95ee\u7684\u53ea\u6709\u7c7b\u7684\u9759\u6001\u6210\u5458（\u516c\u5171\u533a\u57df），\u65e0\u6cd5\u76f4\u63a5\u8bbf\u95ee\u5b9e\u4f8b\u6210\u5458（\u79c1\u4eba\u533a\u57df）\u3002<\/p>\n<\/p>\n

public class Company {
\n \/\/ \u9759\u6001\u6210\u5458：\u516c\u5171\u533a\u57df（\u5982\u524d\u53f0\u6253\u5370\u673a）
\n private static String companyName = "\u672a\u6765\u79d1\u6280";<\/p>\n

\/\/ \u5b9e\u4f8b\u6210\u5458：\u79c1\u4eba\u533a\u57df（\u5982\u5458\u5de5\u7535\u8111）
\n private String department; \/\/ \u90e8\u95e8<\/p>\n

\/\/ \u9759\u6001\u65b9\u6cd5：\u524d\u53f0\u5de5\u4f5c\u4eba\u5458
\n public static void printCompanyInfo() {
\n \/\/ \u53ef\u4ee5\u8bbf\u95ee\u9759\u6001\u6210\u5458（\u516c\u5171\u533a\u57df）
\n System.out.println("\u516c\u53f8\u540d\u79f0：" + companyName);<\/p>\n

\/\/ \u7f16\u8bd1\u9519\u8bef：\u4e0d\u80fd\u76f4\u63a5\u8bbf\u95ee\u5b9e\u4f8b\u6210\u5458（\u79c1\u4eba\u533a\u57df）
\n \/\/ System.out.println("\u90e8\u95e8：" + department);<\/p>\n

\/\/ \u7f16\u8bd1\u9519\u8bef：\u4e0d\u80fd\u4f7f\u7528this（\u6ca1\u6709\u5177\u4f53\u5458\u5de5）
\n \/\/ System.out.println(this.department);
\n }
\n}<\/p>\n

\u539f\u7406\u5206\u6790：\u9759\u6001\u65b9\u6cd5\u5728\u6267\u884c\u65f6，\u53ef\u80fd\u8fd8\u6ca1\u6709\u4efb\u4f55\u5bf9\u8c61\u88ab\u521b\u5efa（\u5c31\u50cf\u516c\u53f8\u521a\u6210\u7acb，\u8fd8\u6ca1\u62db\u8058\u5458\u5de5），\u56e0\u6b64\u65e0\u6cd5\u786e\u5b9a\u8981\u8bbf\u95ee\u54ea\u4e2a\u5bf9\u8c61\u7684\u5b9e\u4f8b\u6210\u5458，\u4e5f\u4e0d\u5b58\u5728this\u5f15\u7528\u3002<\/p>\n<\/p>\n

\u751f\u6d3b\u5316\u89e3\u91ca：\u524d\u53f0\u7684\u6253\u5370\u673a（\u9759\u6001\u65b9\u6cd5）\u77e5\u9053\u516c\u53f8\u540d\u79f0（\u9759\u6001\u53d8\u91cf），\u4f46\u4e0d\u80fd\u76f4\u63a5\u8bbf\u95ee\u67d0\u4e2a\u5458\u5de5\u7535\u8111\u91cc\u7684\u6587\u4ef6（\u5b9e\u4f8b\u53d8\u91cf）\u2014\u2014 \u5b83\u6839\u672c\u4e0d\u77e5\u9053\u8981\u8bbf\u95ee\u54ea\u4e2a\u5458\u5de5\u7684\u7535\u8111\u3002<\/p>\n

2. \u5b9e\u4f8b\u65b9\u6cd5\u7684\u8bbf\u95ee\u7279\u6743：\u516c\u79c1\u533a\u57df\u90fd\u80fd\u8fdb<\/h4>\n

\u5b9e\u4f8b\u65b9\u6cd5\u5c5e\u4e8e\u5177\u4f53\u5bf9\u8c61（\u5458\u5de5），\u5b83\u65e2\u80fd\u8bbf\u95ee\u5b9e\u4f8b\u6210\u5458（\u81ea\u5df1\u7684\u79c1\u4eba\u533a\u57df），\u4e5f\u80fd\u8bbf\u95ee\u9759\u6001\u6210\u5458（\u516c\u53f8\u516c\u5171\u533a\u57df）\u3002<\/p>\n<\/p>\n

public class Employee {
\n \/\/ \u9759\u6001\u6210\u5458：\u516c\u53f8\u516c\u5171\u4fe1\u606f
\n private static String companyName = "\u672a\u6765\u79d1\u6280";<\/p>\n

\/\/ \u5b9e\u4f8b\u6210\u5458：\u5458\u5de5\u79c1\u4eba\u4fe1\u606f
\n private String name; \/\/ \u59d3\u540d<\/p>\n

\/\/ \u5b9e\u4f8b\u65b9\u6cd5：\u5458\u5de5\u7684\u5de5\u4f5c\u884c\u4e3a
\n public void work() {
\n \/\/ \u53ef\u4ee5\u8bbf\u95ee\u5b9e\u4f8b\u6210\u5458（\u81ea\u5df1\u7684\u4fe1\u606f）
\n System.out.println(name + "\u6b63\u5728\u5de5\u4f5c");<\/p>\n

\/\/ \u53ef\u4ee5\u8bbf\u95ee\u9759\u6001\u6210\u5458（\u516c\u53f8\u4fe1\u606f）
\n System.out.println("\u6240\u5c5e\u516c\u53f8：" + companyName);<\/p>\n

\/\/ \u53ef\u4ee5\u8c03\u7528\u9759\u6001\u65b9\u6cd5（\u4f7f\u7528\u516c\u5171\u8bbe\u65bd）
\n printCompanyNotice();<\/p>\n

\/\/ \u53ef\u4ee5\u8c03\u7528\u5b9e\u4f8b\u65b9\u6cd5（\u81ea\u5df1\u7684\u5176\u4ed6\u884c\u4e3a）
\n checkEmail();
\n }<\/p>\n

private void checkEmail() {
\n \/\/ \u5b9e\u4f8b\u65b9\u6cd5\u8bbf\u95ee\u5b9e\u4f8b\u6210\u5458
\n System.out.println(name + "\u67e5\u770b\u90ae\u4ef6");
\n }<\/p>\n

private static void printCompanyNotice() {
\n \/\/ \u9759\u6001\u65b9\u6cd5\u8bbf\u95ee\u9759\u6001\u6210\u5458
\n System.out.println(companyName + "\u901a\u77e5：\u5468\u4e94\u4e0b\u5348\u5f00\u4f1a");
\n }
\n}<\/p>\n

\u539f\u7406\u5206\u6790：\u5b9e\u4f8b\u65b9\u6cd5\u603b\u662f\u901a\u8fc7\u5177\u4f53\u5bf9\u8c61\u8c03\u7528（\u5bf9\u8c61.\u65b9\u6cd5()），\u9690\u542bthis\u5f15\u7528（\u5f53\u524d\u5bf9\u8c61），\u56e0\u6b64\u65e2\u80fd\u8bbf\u95ee\u81ea\u5df1\u7684\u5b9e\u4f8b\u6210\u5458，\u4e5f\u80fd\u8bbf\u95ee\u7c7b\u7684\u9759\u6001\u6210\u5458（\u56e0\u4e3a\u9759\u6001\u6210\u5458\u5c5e\u4e8e\u6574\u4e2a\u7c7b，\u5bf9\u6240\u6709\u5b9e\u4f8b\u53ef\u89c1）\u3002<\/p>\n<\/p>\n

\u751f\u6d3b\u5316\u89e3\u91ca：\u5458\u5de5（\u5b9e\u4f8b）\u65e2\u80fd\u4f7f\u7528\u81ea\u5df1\u7684\u7535\u8111（\u5b9e\u4f8b\u6210\u5458），\u4e5f\u80fd\u4f7f\u7528\u516c\u53f8\u7684\u516c\u5171\u6253\u5370\u673a（\u9759\u6001\u65b9\u6cd5），\u8fd8\u80fd\u67e5\u770b\u516c\u53f8\u516c\u544a（\u9759\u6001\u53d8\u91cf）\u2014\u2014 \u53ea\u8981\u662f\u516c\u53f8\u91cc\u7684\u8d44\u6e90，\u4ed6\u90fd\u80fd\u6309\u9700\u4f7f\u7528\u3002<\/p>\n

3. \u8bbf\u95ee\u89c4\u5219\u603b\u7ed3：\u4e00\u5f20\u8868\u770b\u6e05\u6743\u9650\u8fb9\u754c<\/h4>\n\n\u8bbf\u95ee\u8005 \\\\ \u88ab\u8bbf\u95ee\u8005\u9759\u6001\u53d8\u91cf\u9759\u6001\u65b9\u6cd5\u5b9e\u4f8b\u53d8\u91cf\u5b9e\u4f8b\u65b9\u6cd5<\/tr>\n\n\n\n
\u9759\u6001\u65b9\u6cd5<\/td>\n\u2705<\/td>\n\u2705<\/td>\n\u274c<\/td>\n\u274c<\/td>\n<\/tr>\n
\u5b9e\u4f8b\u65b9\u6cd5<\/td>\n\u2705<\/td>\n\u2705<\/td>\n\u2705<\/td>\n\u2705<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

\u4e00\u53e5\u8bdd\u8bb0\u4f4f：\u9759\u6001\u65b9\u6cd5\u53ea\u80fd "\u770b\u89c1" \u9759\u6001\u7684\u4e1c\u897f，\u5b9e\u4f8b\u65b9\u6cd5\u65e2\u80fd "\u770b\u89c1" \u9759\u6001\u7684\u4e1c\u897f，\u4e5f\u80fd "\u770b\u89c1" \u5b9e\u4f8b\u7684\u4e1c\u897f\u3002<\/p>\n

\u4e8c\u3001\u6700\u5bb9\u6613\u8e29\u7684 5 \u4e2a "\u8de8\u754c\u8bbf\u95ee" \u9677\u9631<\/h3>\n

\u5373\u4f7f\u77e5\u9053\u4e86\u89c4\u5219，\u5f00\u53d1\u8005\u4ecd\u4f1a\u5728\u9759\u6001\u4e0e\u5b9e\u4f8b\u7684\u8bbf\u95ee\u8fb9\u754c\u4e0a\u683d\u8ddf\u5934\u3002\u4ee5\u4e0b\u662f\u6700\u5e38\u89c1\u7684 5 \u4e2a\u9677\u9631\u53ca\u89e3\u51b3\u65b9\u6848：<\/p>\n

\u9677\u9631 1：\u5728\u9759\u6001\u65b9\u6cd5\u4e2d\u4f7f\u7528 this \u5173\u952e\u5b57<\/h4>\n

public class Calculator {
\n private static final double PI = 3.14159;
\n private int scale; \/\/ \u8ba1\u7b97\u7cbe\u5ea6<\/p>\n

public static double calculateCircleArea(double radius) {
\n \/\/ \u7f16\u8bd1\u9519\u8bef：\u9759\u6001\u65b9\u6cd5\u4e2d\u4e0d\u80fd\u4f7f\u7528this
\n return PI * radius * radius * this.scale;
\n }
\n}<\/p>\n

\u9519\u8bef\u539f\u56e0：this\u4ee3\u8868\u5f53\u524d\u5bf9\u8c61，\u800c\u9759\u6001\u65b9\u6cd5\u5c5e\u4e8e\u7c7b，\u4e0d\u4f9d\u8d56\u5177\u4f53\u5bf9\u8c61\u5b58\u5728\u3002<\/p>\n<\/p>\n

\u89e3\u51b3\u65b9\u6848：<\/p>\n<\/p>\n

    \n
  • \u5982\u679c\u9700\u8981\u4f7f\u7528\u5b9e\u4f8b\u53d8\u91cf，\u5c06\u65b9\u6cd5\u6539\u4e3a\u5b9e\u4f8b\u65b9\u6cd5<\/li>\n
  • \u82e5\u5fc5\u987b\u662f\u9759\u6001\u65b9\u6cd5，\u53ef\u5c06\u5b9e\u4f8b\u4f5c\u4e3a\u53c2\u6570\u4f20\u5165\n<\/p>\n

    \/\/ \u6b63\u786e：\u5c06\u5b9e\u4f8b\u4f5c\u4e3a\u53c2\u6570\u4f20\u5165\u9759\u6001\u65b9\u6cd5
    \npublic static double calculateCircleArea(double radius, Calculator calc) {
    \n return PI * radius * radius * calc.scale;
    \n}\n <\/li>\n<\/ul>\n

    \u9677\u9631 2：\u901a\u8fc7\u5bf9\u8c61\u8c03\u7528\u9759\u6001\u65b9\u6cd5<\/h4>\n

    public class DateUtils {
    \n public static String format(Date date) {
    \n \/\/ \u683c\u5f0f\u5316\u65e5\u671f\u7684\u903b\u8f91
    \n }
    \n}<\/p>\n

    \/\/ \u9519\u8bef\u7528\u6cd5：\u901a\u8fc7\u5bf9\u8c61\u8c03\u7528\u9759\u6001\u65b9\u6cd5
    \nDateUtils utils = new DateUtils();
    \nutils.format(new Date()); \/\/ \u80fd\u8fd0\u884c，\u4f46\u8fdd\u80cc\u8bbe\u8ba1\u610f\u56fe<\/p>\n

    \u9690\u85cf\u98ce\u9669：<\/p>\n<\/p>\n

      \n
    • \u8bef\u5bfc\u9605\u8bfb\u8005：\u8ba9\u4eba\u8bef\u4ee5\u4e3a\u8fd9\u662f\u5b9e\u4f8b\u65b9\u6cd5，\u4f9d\u8d56\u5bf9\u8c61\u72b6\u6001<\/li>\n
    • \u7f16\u8bd1\u671f\u4f18\u5316：\u5b9e\u9645\u7f16\u8bd1\u540e\u4ecd\u4f1a\u8f6c\u4e3aDateUtils.format()，\u5bf9\u8c61\u5f15\u7528\u88ab\u5ffd\u7565<\/li>\n<\/ul>\n

      \u6b63\u786e\u505a\u6cd5：\u59cb\u7ec8\u901a\u8fc7\u7c7b\u540d\u8c03\u7528\u9759\u6001\u65b9\u6cd5<\/p>\n<\/p>\n

      DateUtils.format(new Date()); \/\/ \u6e05\u6670\u8868\u8fbe\u8fd9\u662f\u9759\u6001\u65b9\u6cd5<\/p>\n

      \u751f\u6d3b\u5316\u7c7b\u6bd4：\u4f60\u4e0d\u4f1a\u8bf4 "\u5f20\u4e09\u7684\u6253\u5370\u673a"，\u56e0\u4e3a\u6253\u5370\u673a\u662f\u516c\u53f8\u7684（\u9759\u6001），\u5e94\u8be5\u8bf4 "\u516c\u53f8\u7684\u6253\u5370\u673a"\u3002<\/p>\n

      \u9677\u9631 3：\u5b9e\u4f8b\u65b9\u6cd5\u8fc7\u5ea6\u4f9d\u8d56\u9759\u6001\u6210\u5458<\/h4>\n

      public class ShoppingCart {
      \n \/\/ \u9759\u6001\u53d8\u91cf：\u6240\u6709\u8d2d\u7269\u8f66\u5171\u4eab\u7684\u6298\u6263
      \n private static double discount = 0.9;<\/p>\n

      private List<Product> products = new ArrayList<>();<\/p>\n

      \/\/ \u5b9e\u4f8b\u65b9\u6cd5\u8ba1\u7b97\u603b\u4ef7，\u5374\u8fc7\u5ea6\u4f9d\u8d56\u9759\u6001\u53d8\u91cf
      \n public double calculateTotal() {
      \n double total = 0;
      \n for (Product p : products) {
      \n total += p.getPrice();
      \n }
      \n return total * discount; \/\/ \u6240\u6709\u8d2d\u7269\u8f66\u4f7f\u7528\u76f8\u540c\u6298\u6263
      \n }
      \n}<\/p>\n

      \u8bbe\u8ba1\u95ee\u9898：<\/p>\n<\/p>\n

        \n
      • \u8fdd\u53cd\u5c01\u88c5\u539f\u5219：\u8d2d\u7269\u8f66\u7684\u603b\u4ef7\u8ba1\u7b97\u4f9d\u8d56\u5168\u5c40\u9759\u6001\u53d8\u91cf<\/li>\n
      • \u7075\u6d3b\u6027\u5dee：\u65e0\u6cd5\u4e3a\u4e0d\u540c\u7528\u6237\u8bbe\u7f6e\u4e0d\u540c\u6298\u6263（\u5982 VIP \u5ba2\u6237 9 \u6298，\u666e\u901a\u5ba2\u6237\u65e0\u6298\u6263）<\/li>\n<\/ul>\n

        \u89e3\u51b3\u65b9\u6848：\u5c06\u9759\u6001\u53d8\u91cf\u6539\u4e3a\u5b9e\u4f8b\u53d8\u91cf，\u6216\u901a\u8fc7\u53c2\u6570\u4f20\u5165<\/p>\n<\/p>\n

        public class ShoppingCart {
        \n private double discount; \/\/ \u6bcf\u4e2a\u8d2d\u7269\u8f66\u6709\u81ea\u5df1\u7684\u6298\u6263<\/p>\n

        public ShoppingCart(double discount) {
        \n this.discount = discount; \/\/ \u6784\u9020\u65f6\u6307\u5b9a\u6298\u6263
        \n }<\/p>\n

        \/\/ \u73b0\u5728\u53ef\u4ee5\u4e3a\u4e0d\u540c\u8d2d\u7269\u8f66\u8bbe\u7f6e\u4e0d\u540c\u6298\u6263
        \n}<\/p>\n

        \u9677\u9631 4：\u9759\u6001\u65b9\u6cd5\u4e2d\u521b\u5efa\u8fc7\u591a\u5b9e\u4f8b\u5bf9\u8c61<\/h4>\n

        public class StringUtils {
        \n \/\/ \u9759\u6001\u5de5\u5177\u65b9\u6cd5
        \n public static boolean isEmpty(String str) {
        \n \/\/ \u6bcf\u6b21\u8c03\u7528\u90fd\u521b\u5efa\u65b0\u5bf9\u8c61，\u6d6a\u8d39\u8d44\u6e90
        \n StringProcessor processor = new StringProcessor();
        \n return processor.checkEmpty(str);
        \n }
        \n}<\/p>\n

        class StringProcessor {
        \n public boolean checkEmpty(String str) {
        \n return str == null || str.isEmpty();
        \n }
        \n}<\/p>\n

        \u6027\u80fd\u95ee\u9898：\u9759\u6001\u65b9\u6cd5\u88ab\u9891\u7e41\u8c03\u7528\u65f6（\u5982\u5de5\u5177\u7c7b\u65b9\u6cd5），\u4f1a\u521b\u5efa\u5927\u91cf\u4e34\u65f6\u5bf9\u8c61，\u589e\u52a0 GC \u8d1f\u62c5\u3002<\/p>\n<\/p>\n

        \u89e3\u51b3\u65b9\u6848：<\/p>\n<\/p>\n

          \n
        • \u5c06\u5b9e\u4f8b\u65b9\u6cd5\u6539\u4e3a\u9759\u6001\u65b9\u6cd5，\u907f\u514d\u521b\u5efa\u5bf9\u8c61<\/li>\n
        • \u4f7f\u7528\u5355\u4f8b\u6a21\u5f0f\u590d\u7528\u5bf9\u8c61（\u9002\u7528\u4e8e\u91cd\u91cf\u7ea7\u5bf9\u8c61）<\/li>\n<\/ul>\n

          public class StringUtils {
          \n \/\/ \u5355\u4f8b\u5bf9\u8c61
          \n private static final StringProcessor processor = new StringProcessor();<\/p>\n

          public static boolean isEmpty(String str) {
          \n return processor.checkEmpty(str); \/\/ \u590d\u7528\u540c\u4e00\u5bf9\u8c61
          \n }
          \n}<\/p>\n

          \u9677\u9631 5：\u6df7\u6dc6\u9759\u6001\u65b9\u6cd5\u4e0e\u5b9e\u4f8b\u65b9\u6cd5\u7684\u7ee7\u627f\u884c\u4e3a<\/h4>\n

          class Animal {
          \n public static void eat() {
          \n System.out.println("\u52a8\u7269\u5403\u4e1c\u897f");
          \n }<\/p>\n

          public void sleep() {
          \n System.out.println("\u52a8\u7269\u7761\u89c9");
          \n }
          \n}<\/p>\n

          class Dog extends Animal {
          \n \/\/ \u4e0d\u662f\u91cd\u5199，\u800c\u662f\u9690\u85cf\u7236\u7c7b\u9759\u6001\u65b9\u6cd5
          \n public static void eat() {
          \n System.out.println("\u72d7\u5403\u9aa8\u5934");
          \n }<\/p>\n

          \/\/ \u91cd\u5199\u5b9e\u4f8b\u65b9\u6cd5
          \n @Override
          \n public void sleep() {
          \n System.out.println("\u72d7\u8db4\u7740\u7761");
          \n }
          \n}<\/p>\n

          \/\/ \u6d4b\u8bd5
          \npublic class Test {
          \n public static void main(String[] args) {
          \n Animal animal = new Dog();
          \n animal.eat(); \/\/ \u8f93\u51fa"\u52a8\u7269\u5403\u4e1c\u897f"（\u9759\u6001\u65b9\u6cd5\u770b\u58f0\u660e\u7c7b\u578b）
          \n animal.sleep(); \/\/ \u8f93\u51fa"\u72d7\u8db4\u7740\u7761"（\u5b9e\u4f8b\u65b9\u6cd5\u770b\u5b9e\u9645\u7c7b\u578b）
          \n }
          \n}<\/p>\n

          \u5173\u952e\u533a\u522b：<\/p>\n<\/p>\n

            \n
          • \u9759\u6001\u65b9\u6cd5：\u4e0d\u5b58\u5728\u91cd\u5199，\u8c03\u7528\u54ea\u4e2a\u7248\u672c\u7531\u58f0\u660e\u7c7b\u578b\u51b3\u5b9a（\u7f16\u8bd1\u671f\u7ed1\u5b9a）<\/li>\n
          • \u5b9e\u4f8b\u65b9\u6cd5：\u652f\u6301\u91cd\u5199，\u8c03\u7528\u54ea\u4e2a\u7248\u672c\u7531\u5b9e\u9645\u5bf9\u8c61\u7c7b\u578b\u51b3\u5b9a（\u8fd0\u884c\u671f\u7ed1\u5b9a）<\/li>\n<\/ul>\n

            \u89e3\u51b3\u65b9\u6848：<\/p>\n<\/p>\n

              \n
            • \u4e0d\u8981\u8bd5\u56fe\u901a\u8fc7\u7ee7\u627f\u91cd\u5199\u9759\u6001\u65b9\u6cd5<\/li>\n
            • \u9759\u6001\u65b9\u6cd5\u8c03\u7528\u59cb\u7ec8\u4f7f\u7528\u7c7b\u540d，\u907f\u514d\u901a\u8fc7\u5bf9\u8c61\u5f15\u7528\u8c03\u7528<\/li>\n<\/ul>\n

              \u4e09\u3001\u9759\u6001\u65b9\u6cd5\u4e0e\u5b9e\u4f8b\u65b9\u6cd5\u7684\u9009\u62e9\u6307\u5357<\/h3>\n

              \u9762\u5bf9\u4e00\u4e2a\u529f\u80fd，\u8be5\u7528\u9759\u6001\u65b9\u6cd5\u8fd8\u662f\u5b9e\u4f8b\u65b9\u6cd5？\u53ef\u4ee5\u7528\u4ee5\u4e0b "\u4e09\u6b65\u5224\u65ad\u6cd5"：<\/p>\n<\/p>\n

            • \n

              \u662f\u5426\u4f9d\u8d56\u5b9e\u4f8b\u72b6\u6001？<\/p>\n

                \n
              • \u662f \u2192 \u5fc5\u987b\u7528\u5b9e\u4f8b\u65b9\u6cd5（\u5982User.getName()\u4f9d\u8d56\u5177\u4f53\u7528\u6237）<\/li>\n
              • \u5426 \u2192 \u8fdb\u5165\u4e0b\u4e00\u6b65<\/li>\n<\/ul>\n<\/li>\n
              • \n

                \u662f\u5426\u4e0e\u7c7b\u7684\u6574\u4f53\u529f\u80fd\u76f8\u5173？<\/p>\n

                  \n
                • \u662f \u2192 \u8003\u8651\u9759\u6001\u65b9\u6cd5（\u5982Math.max()\u3001StringUtils.isEmpty()）<\/li>\n
                • \u5426 \u2192 \u53ef\u80fd\u9700\u8981\u91cd\u65b0\u8bbe\u8ba1\u7c7b<\/li>\n<\/ul>\n<\/li>\n
                • \n

                  \u662f\u5426\u9700\u8981\u591a\u6001\u884c\u4e3a？<\/p>\n

                    \n
                  • \u662f \u2192 \u5fc5\u987b\u7528\u5b9e\u4f8b\u65b9\u6cd5（\u9759\u6001\u65b9\u6cd5\u4e0d\u652f\u6301\u591a\u6001）<\/li>\n
                  • \u5426 \u2192 \u53ef\u8003\u8651\u9759\u6001\u65b9\u6cd5<\/li>\n<\/ul>\n<\/li>\n

                    \u7ecf\u5178\u573a\u666f\u53c2\u8003：<\/p>\n<\/p>\n

                      \n
                    • \u9759\u6001\u65b9\u6cd5：\u5de5\u5177\u7c7b\u65b9\u6cd5（\u5982\u6570\u636e\u8f6c\u6362\u3001\u6821\u9a8c）\u3001\u5de5\u5382\u65b9\u6cd5\u3001\u5e38\u91cf\u8bbf\u95ee<\/li>\n
                    • \u5b9e\u4f8b\u65b9\u6cd5：\u4e1a\u52a1\u5b9e\u4f53\u7684\u884c\u4e3a（\u5982order.pay()\u3001user.login()）\u3001\u9700\u8981\u591a\u6001\u7684\u65b9\u6cd5<\/li>\n<\/ul>\n

                      \u603b\u7ed3：\u7406\u89e3 "\u5171\u4eab" \u4e0e "\u4e13\u5c5e" \u7684\u672c\u8d28<\/h3>\n

                      \u9759\u6001\u65b9\u6cd5\u4e0e\u5b9e\u4f8b\u65b9\u6cd5\u7684\u6838\u5fc3\u533a\u522b，\u5728\u4e8e\u662f\u5426\u4f9d\u8d56\u5177\u4f53\u5bf9\u8c61\u7684\u72b6\u6001：<\/p>\n<\/p>\n

                        \n
                      • \u9759\u6001\u65b9\u6cd5\u662f "\u5171\u4eab\u5de5\u5177"，\u50cf\u516c\u53f8\u7684\u516c\u5171\u8bbe\u65bd，\u4e3a\u6240\u6709\u5bf9\u8c61\u670d\u52a1，\u4f46\u4e0d\u80fd\u8bbf\u95ee\u67d0\u4e2a\u5bf9\u8c61\u7684\u79c1\u6709\u6570\u636e<\/li>\n
                      • \u5b9e\u4f8b\u65b9\u6cd5\u662f "\u4e13\u5c5e\u52a9\u624b"，\u50cf\u5458\u5de5\u7684\u4e2a\u4eba\u6280\u80fd，\u4f9d\u8d56\u5177\u4f53\u5bf9\u8c61\u7684\u72b6\u6001，\u4e5f\u80fd\u4f7f\u7528\u516c\u5171\u8d44\u6e90<\/li>\n<\/ul>\n

                        \u8bb0\u4f4f\u8fd9\u6761 "\u8fb9\u754c"：\u9759\u6001\u65b9\u6cd5\u53ea\u80fd\u8bbf\u95ee\u9759\u6001\u6210\u5458，\u5b9e\u4f8b\u65b9\u6cd5\u53ef\u4ee5\u8bbf\u95ee\u6240\u6709\u6210\u5458\u3002\u5f53\u4f60\u4e0d\u786e\u5b9a\u8be5\u7528\u54ea\u79cd\u65b9\u6cd5\u65f6，\u4e0d\u59a8\u95ee\u81ea\u5df1：\u8fd9\u4e2a\u529f\u80fd\u662f\u5c5e\u4e8e\u6574\u4e2a\u7c7b\u7684 "\u516c\u5171\u670d\u52a1"，\u8fd8\u662f\u5c5e\u4e8e\u67d0\u4e2a\u5bf9\u8c61\u7684 "\u4e13\u5c5e\u884c\u4e3a"？\u60f3\u6e05\u695a\u8fd9\u4e2a\u95ee\u9898，\u5c31\u80fd\u907f\u5f00\u5927\u591a\u6570\u9759\u6001\u4e0e\u5b9e\u4f8b\u65b9\u6cd5\u7684\u4f7f\u7528\u9677\u9631\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"

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