{"id":230,"date":"2026-07-16T10:28:42","date_gmt":"2026-07-16T02:28:42","guid":{"rendered":"http:\/\/ssjava.xyz\/?p=230"},"modified":"2026-07-17T11:07:28","modified_gmt":"2026-07-17T03:07:28","slug":"11-%e6%9e%84%e9%80%a0%e5%99%a8%e8%af%a6%e8%a7%a3%ef%bc%9a%e5%af%b9%e8%b1%a1%e5%88%9b%e5%bb%ba%e7%9a%84%e8%89%ba%e6%9c%af","status":"publish","type":"post","link":"https:\/\/ssjava.xyz\/index.php\/2026\/07\/16\/11-%e6%9e%84%e9%80%a0%e5%99%a8%e8%af%a6%e8%a7%a3%ef%bc%9a%e5%af%b9%e8%b1%a1%e5%88%9b%e5%bb%ba%e7%9a%84%e8%89%ba%e6%9c%af\/","title":{"rendered":"11. \u6784\u9020\u5668\u8be6\u89e3\uff1a\u5bf9\u8c61\u521b\u5efa\u7684\u827a\u672f"},"content":{"rendered":"\n

\u4e0a\u4e00\u7bc7\u6587\u7ae0\u4e2d\uff0c\u6211\u4eec\u7528 new Student()<\/code> \u521b\u5efa\u4e86\u4e00\u4e2a\u5b66\u751f\u5bf9\u8c61\uff0c\u7136\u540e\u901a\u8fc7 setter \u65b9\u6cd5\u9010\u4e2a\u8bbe\u7f6e\u5c5e\u6027\uff1a<\/p>\n\n\n

Student s = new Student();\ns.setName(\"\u5f20\u4e09\");\ns.setAge(20);\ns.setStudentId(\"20240001\");\ns.setScore(85.5);<\/code><\/pre>\n\n\n
\u6bcf\u6b21\u521b\u5efa\u5bf9\u8c61\u540e\u90fd\u8981\u624b\u52a8\u8c03 setter\uff0c\u662f\u4e0d\u662f\u6709\u70b9\u9ebb\u70e6\uff1f\u800c\u4e14\u6709\u4e9b\u5c5e\u6027\u662f\u5bf9\u8c61\u4e00\u51fa\u751f\u5c31\u5fc5\u987b\u5177\u5907<\/strong>\u7684\u2014\u2014\u6bd4\u5982\u4e00\u4e2a\u4eba\u51fa\u751f\u65f6\u5c31\u6709\u540d\u5b57\u548c\u51fa\u751f\u65e5\u671f\u3002Java \u63d0\u4f9b\u4e86\u4e00\u4e2a\u4f18\u96c5\u7684\u89e3\u51b3\u65b9\u6848\uff1a\u6784\u9020\u5668<\/strong>\uff08Constructor\uff09\u3002<\/p>\n\n\n\n
\u4e00\u3001\u4ec0\u4e48\u662f\u6784\u9020\u5668\uff1f<\/h2>\n\n\n\n
\u6784\u9020\u5668<\/strong>\u662f\u4e00\u4e2a\u7279\u6b8a\u7684\u65b9\u6cd5<\/strong>\uff0c\u5728\u521b\u5efa\u5bf9\u8c61\u65f6\u81ea\u52a8\u8c03\u7528\u3002\u5b83\u7684\u4e3b\u8981\u4f5c\u7528\u662f\u521d\u59cb\u5316\u5bf9\u8c61\u7684\u72b6\u6001<\/strong>\u3002<\/p>\n\n\n\n
1.1 \u6784\u9020\u5668\u7684\u8bed\u6cd5<\/h3>\n\n\n
[\u8bbf\u95ee\u4fee\u9970\u7b26] \u7c7b\u540d([\u53c2\u6570\u5217\u8868]) {\n    \/\/ \u521d\u59cb\u5316\u4ee3\u7801\n}<\/code><\/pre>\n\n\n
\u6784\u9020\u5668\u7684\u4e09\u4e2a\u7279\u70b9\uff1a<\/p>\n\n\n\n
    \n
  • \u540d\u79f0\u5fc5\u987b\u4e0e\u7c7b\u540d\u5b8c\u5168\u76f8\u540c<\/strong><\/li>\n\n\n\n
  • \u6ca1\u6709\u8fd4\u56de\u503c\u7c7b\u578b<\/strong>\uff08\u8fde void<\/code> \u90fd\u4e0d\u80fd\u5199\uff09<\/li>\n\n\n\n
  • \u521b\u5efa\u5bf9\u8c61\u65f6\u81ea\u52a8\u8c03\u7528<\/strong>\uff0c\u4e0d\u80fd\u624b\u52a8\u8c03\u7528<\/li>\n<\/ul>\n\n\n\n
    1.2 \u9ed8\u8ba4\u6784\u9020\u5668<\/h3>\n\n\n\n
    \u7ec6\u5fc3\u7684\u8bfb\u8005\u53ef\u80fd\u4f1a\u95ee\uff1a\u6211\u4eec\u4e0a\u4e00\u7bc7\u6587\u7ae0\u7684 Student<\/code> \u7c7b\u660e\u660e\u6ca1\u5199\u4efb\u4f55\u6784\u9020\u5668\uff0c\u4e3a\u4ec0\u4e48 new Student()<\/code> \u80fd\u7f16\u8bd1\u901a\u8fc7\uff1f<\/p>\n\n\n\n
    \u7b54\u6848\u662f\uff1a\u5982\u679c\u4e00\u4e2a\u7c7b\u6ca1\u6709\u663e\u5f0f\u5b9a\u4e49\u4efb\u4f55\u6784\u9020\u5668\uff0cJava \u4f1a\u81ea\u52a8\u63d0\u4f9b\u4e00\u4e2a\u65e0\u53c2\u7684\u9ed8\u8ba4\u6784\u9020\u5668<\/strong>\uff0c\u5b83\u7684\u5b9e\u73b0\u662f\u7a7a\u7684\uff0c\u4ec0\u4e48\u90fd\u4e0d\u505a\u3002<\/p>\n\n\n
    \/\/ \u9ed8\u8ba4\u6784\u9020\u5668\u7b49\u4ef7\u4e8e\uff1a\npublic Student() {\n    \/\/ \u7a7a\u5b9e\u73b0\n}<\/code><\/pre>\n\n\n
    \u91cd\u8981\u89c4\u5219<\/strong>\uff1a\u4e00\u65e6\u4f60\u624b\u52a8\u5b9a\u4e49\u4e86\u4efb\u4f55<\/strong>\u6784\u9020\u5668\uff0c\u9ed8\u8ba4\u6784\u9020\u5668\u5c31\u4e0d\u518d\u81ea\u52a8\u63d0\u4f9b<\/strong>\u4e86\u3002\u4e5f\u5c31\u662f\u8bf4\uff0c\u5982\u679c\u4f60\u53ea\u5199\u4e86\u4e00\u4e2a\u5e26\u53c2\u6784\u9020\u5668\uff0cnew Student()<\/code> \u5c31\u65e0\u6cd5\u7f16\u8bd1\uff0c\u9664\u975e\u4f60\u628a\u65e0\u53c2\u6784\u9020\u5668\u4e5f\u624b\u52a8\u8865\u4e0a\u3002<\/p>\n\n\n\n
    \u4e8c\u3001\u65e0\u53c2\u6784\u9020\u5668\u4e0e\u5e26\u53c2\u6784\u9020\u5668<\/h2>\n\n\n\n
    2.1 \u7f16\u5199\u65e0\u53c2\u6784\u9020\u5668<\/h3>\n\n\n\n
    \u65e0\u53c2\u6784\u9020\u5668\u901a\u5e38\u7528\u6765\u7ed9\u5c5e\u6027\u8bbe\u7f6e\u9ed8\u8ba4\u503c\uff1a<\/p>\n\n\n
    public class Student {\n    private String name;\n    private int age;\n    private String studentId;\n    private double score;\n    \n    \/\/ \u65e0\u53c2\u6784\u9020\u5668\uff1a\u8bbe\u7f6e\u521d\u59cb\u503c\n    public Student() {\n        this.name = \"\u672a\u77e5\";\n        this.age = 18;\n        this.studentId = \"00000000\";\n        this.score = 60.0;\n        System.out.println(\"Student \u5bf9\u8c61\u5df2\u521b\u5efa\uff0c\u9ed8\u8ba4\u521d\u59cb\u5316\u5b8c\u6210\uff01\");\n    }\n    \n    \/\/ ... getter\/setter \u7701\u7565\uff08\u540c\u4e0a\u4e00\u7bc7\u6587\u7ae0\uff09\n}<\/code><\/pre>\n
    public class TestStudent {\n    public static void main(String[] args) {\n        Student s = new Student();  \/\/ \u81ea\u52a8\u8c03\u7528\u65e0\u53c2\u6784\u9020\u5668\n        s.showInfo();\n    }\n}<\/code><\/pre>\n\n\n
    \u8f93\u51fa\uff1a<\/p>\n\n\n\n
    Student \u5bf9\u8c61\u5df2\u521b\u5efa\uff0c\u9ed8\u8ba4\u521d\u59cb\u5316\u5b8c\u6210\uff01\n===== \u5b66\u751f\u4fe1\u606f =====\n\u59d3\u540d\uff1a\u672a\u77e5\n\u5e74\u9f84\uff1a18\n\u5b66\u53f7\uff1a00000000\n\u6210\u7ee9\uff1a60.0\n\u7b49\u7ea7\uff1a\u53ca\u683c\n===================<\/code><\/pre>\n\n\n\n
    2.2 \u5e26\u53c2\u6784\u9020\u5668\uff1a\u4e00\u6b65\u5230\u4f4d\u5730\u521d\u59cb\u5316<\/h3>\n\n\n\n
    \u5e26\u53c2\u6784\u9020\u5668\u5141\u8bb8\u6211\u4eec\u5728\u521b\u5efa\u5bf9\u8c61\u65f6\u5c31\u4f20\u5165\u521d\u59cb\u6570\u636e\uff0c\u7701\u53bb\u540e\u7eed\u8c03 setter \u7684\u9ebb\u70e6\uff1a<\/p>\n\n\n
    public class Student {\n    \/\/ ... \u5c5e\u6027\u58f0\u660e\u540c\u4e0a\n    \n    \/\/ \u65e0\u53c2\u6784\u9020\u5668\n    public Student() {\n        this.name = \"\u672a\u77e5\";\n        this.age = 18;\n        this.studentId = \"00000000\";\n        this.score = 60.0;\n    }\n    \n    \/\/ \u5e26\u53c2\u6784\u9020\u5668\n    public Student(String name, int age, String studentId, double score) {\n        this.name = name;\n        this.age = age;\n        this.studentId = studentId;\n        this.score = score;\n    }\n    \n    \/\/ ... \u5176\u4f59\u4ee3\u7801\n}<\/code><\/pre>\n\n\n
    \u73b0\u5728\u521b\u5efa\u5bf9\u8c61\u53ef\u4ee5\u4e00\u6b65\u5230\u4f4d\uff1a<\/p>\n\n\n
    public class TestStudent {\n    public static void main(String[] args) {\n        \/\/ \u521b\u5efa\u65f6\u76f4\u63a5\u7ed9\u503c\n        Student s = new Student(\"\u5f20\u4e09\", 20, \"20240001\", 85.5);\n        s.showInfo();\n    }\n}<\/code><\/pre>\n\n\n
    \u662f\u4e0d\u662f\u7b80\u6d01\u591a\u4e86\uff1fnew Student(\"\u5f20\u4e09\", 20, \"20240001\", 85.5)<\/code> \u8fd9\u4e00\u884c\u5c31\u5b8c\u6210\u4e86\u4e4b\u524d 5 \u884c\u4ee3\u7801\u7684\u5de5\u4f5c\u3002<\/p>\n\n\n\n
    \u4e09\u3001\u6784\u9020\u5668\u91cd\u8f7d\uff08Overload\uff09<\/h2>\n\n\n\n
    3.1 \u4ec0\u4e48\u662f\u65b9\u6cd5\u91cd\u8f7d\uff1f<\/h3>\n\n\n\n
    \u91cd\u8f7d<\/strong>\uff08Overload\uff09\u662f\u6307\u5728\u540c\u4e00\u4e2a\u7c7b\u4e2d\uff0c\u65b9\u6cd5\u540d\u76f8\u540c\u4f46\u53c2\u6570\u5217\u8868\u4e0d\u540c<\/strong>\u3002\u6784\u9020\u5668\u4e5f\u53ef\u4ee5\u91cd\u8f7d\uff0c\u4e5f\u5c31\u662f\u8bf4\u6211\u4eec\u53ef\u4ee5\u5b9a\u4e49\u591a\u4e2a\u4e0d\u540c\u53c2\u6570\u5217\u8868\u7684\u6784\u9020\u5668\uff0c\u8ba9\u4f7f\u7528\u8005\u6309\u9700\u9009\u62e9\u3002<\/p>\n\n\n\n
    \u6784\u9020\u5668\u91cd\u8f7d\u7684\u5224\u65ad\u4f9d\u636e\uff1a<\/p>\n\n\n\n
      \n
    • \u53c2\u6570\u4e2a\u6570\u4e0d\u540c<\/li>\n\n\n\n
    • \u53c2\u6570\u7c7b\u578b\u4e0d\u540c<\/li>\n\n\n\n
    • \u53c2\u6570\u987a\u5e8f\u4e0d\u540c<\/li>\n<\/ul>\n\n\n\n
      \u6ce8\u610f<\/strong>\uff1a\u4ec5\u8fd4\u56de\u503c\u7c7b\u578b\u4e0d\u540c\u4e0d\u80fd\u7b97\u91cd\u8f7d\uff08\u6784\u9020\u5668\u672c\u6765\u4e5f\u6ca1\u6709\u8fd4\u56de\u503c\uff09\u3002<\/p>\n\n\n\n
      3.2 \u5b9e\u9645\u4f8b\u5b50<\/h3>\n\n\n\n
      \u4e3a Student<\/code> \u63d0\u4f9b\u591a\u79cd\u521b\u5efa\u65b9\u5f0f\uff1a<\/p>\n\n\n
      public class Student {\n    private String name;\n    private int age;\n    private String studentId;\n    private double score;\n    \n    \/\/ \u2460 \u65e0\u53c2\u6784\u9020\u5668\n    public Student() {\n        this.name = \"\u672a\u77e5\";\n        this.age = 18;\n        this.studentId = \"00000000\";\n        this.score = 60.0;\n    }\n    \n    \/\/ \u2461 \u53ea\u4f20\u59d3\u540d\u548c\u5e74\u9f84\n    public Student(String name, int age) {\n        this.name = name;\n        this.age = age;\n        this.studentId = \"\u5f85\u5206\u914d\";\n        this.score = 0;\n    }\n    \n    \/\/ \u2462 \u4f20\u6240\u6709\u4fe1\u606f\n    public Student(String name, int age, String studentId, double score) {\n        this.name = name;\n        this.age = age;\n        this.studentId = studentId;\n        this.score = score;\n    }\n    \n    \/\/ \u6ce8\u610f\uff1a\u4e0b\u9762\u8fd9\u4e2a\u4e0d\u662f\u91cd\u8f7d\uff01\u548c\u2462\u7684\u53c2\u6570\u7c7b\u578b\u987a\u5e8f\u4e0d\u540c\u4f46\u5b9e\u9645\u662f\u4e00\u6837\u7684\uff08\u7f16\u8bd1\u5668\u65e0\u6cd5\u533a\u5206\uff09\n    \/\/ public Student(String studentId, double score, String name, int age) \/\/ \u274c \u4e0d\u5efa\u8bae\n}<\/code><\/pre>\n\n\n
      \u4f7f\u7528\u65f6\u7684\u7075\u6d3b\u6027\uff1a<\/p>\n\n\n
      public class TestStudent {\n    public static void main(String[] args) {\n        Student s1 = new Student();                        \/\/ \u4f7f\u7528 \u2460\uff0c\u9ed8\u8ba4\u503c\n        Student s2 = new Student(\"\u674e\u56db\", 22);               \/\/ \u4f7f\u7528 \u2461\n        Student s3 = new Student(\"\u738b\u4e94\", 19, \"20240002\", 92.0); \/\/ \u4f7f\u7528 \u2462\n    }\n}<\/code><\/pre>\n\n\n
      \u56db\u3001this() \u8c03\u7528\uff1a\u6784\u9020\u5668\u4e4b\u95f4\u7684\u534f\u4f5c<\/h2>\n\n\n\n
      4.1 \u4e3a\u4ec0\u4e48\u8981\u5728\u4e00\u4e2a\u6784\u9020\u5668\u4e2d\u8c03\u7528\u53e6\u4e00\u4e2a\u6784\u9020\u5668\uff1f<\/h3>\n\n\n\n
      \u89c2\u5bdf\u4e0a\u9762\u7684\u4ee3\u7801\uff0c\u4f60\u4f1a\u53d1\u73b0\u4e00\u4e2a\u4e25\u91cd\u7684\u95ee\u9898\uff1a\u5927\u91cf\u91cd\u590d\u4ee3\u7801<\/strong>\u3002\u4e09\u4e2a\u6784\u9020\u5668\u90fd\u5728\u7ed9\u540c\u6837\u7684\u56db\u4e2a\u5c5e\u6027\u8d4b\u503c\u3002\u5982\u679c\u5c06\u6765\u589e\u52a0\u4e86\u4e00\u4e2a\u5c5e\u6027\uff08\u6bd4\u5982 gender<\/code>\uff09\uff0c\u5c31\u5f97\u4fee\u6539\u4e09\u4e2a\u6784\u9020\u5668\u2014\u2014\u5f88\u5bb9\u6613\u6f0f\u6539\u3002<\/p>\n\n\n\n
      Java \u63d0\u4f9b\u4e86 this()<\/code> \u8bed\u6cd5\uff1a\u5728\u6784\u9020\u5668\u4e2d\u8c03\u7528\u672c\u7c7b\u7684\u53e6\u4e00\u4e2a\u6784\u9020\u5668<\/strong>\u3002<\/p>\n\n\n\n
      4.2 \u7528\u6cd5\u4e0e\u89c4\u5219<\/h3>\n\n\n
      public class Student {\n    private String name;\n    private int age;\n    private String studentId;\n    private double score;\n    \n    \/\/ \u2460 \u6838\u5fc3\u6784\u9020\u5668\uff1a\u63a5\u6536\u6240\u6709\u53c2\u6570\n    public Student(String name, int age, String studentId, double score) {\n        this.name = name;\n        this.age = age;\n        this.studentId = studentId;\n        this.score = score;\n    }\n    \n    \/\/ \u2461 \u53ea\u4f20\u59d3\u540d\u548c\u5e74\u9f84\n    public Student(String name, int age) {\n        \/\/ \u4f7f\u7528 this() \u8c03\u7528\u6784\u9020\u5668 \u2460\uff0c\u5176\u4ed6\u7528\u9ed8\u8ba4\u503c\n        this(name, age, \"\u5f85\u5206\u914d\", 0);\n    }\n    \n    \/\/ \u2462 \u65e0\u53c2\u6784\u9020\u5668\n    public Student() {\n        \/\/ \u8c03\u7528\u6784\u9020\u5668 \u2461\uff0c\u4f20\u5165\u9ed8\u8ba4\u503c\n        this(\"\u672a\u77e5\", 18);\n    }\n}<\/code><\/pre>\n\n\n
      \u6838\u5fc3\u89c4\u5219\uff1a<\/p>\n\n\n\n
        \n
      1. this()<\/code> \u5fc5\u987b\u5199\u5728\u6784\u9020\u5668\u7684\u7b2c\u4e00\u884c<\/strong><\/li>\n\n\n\n
      2. \u4e00\u4e2a\u6784\u9020\u5668\u53ea\u80fd\u8c03\u7528\u4e00\u6b21 this()<\/code>\uff08\u56e0\u4e3a\u5fc5\u987b\u653e\u5728\u7b2c\u4e00\u884c\uff0c\u4e14\u53ea\u80fd\u6709\u4e00\u4e2a\u7b2c\u4e00\u884c\uff09<\/li>\n\n\n\n
      3. \u4e0d\u80fd\u5f62\u6210\u5faa\u73af\u8c03\u7528\uff08A \u8c03 B\uff0cB \u8c03 A\u2014\u2014\u7f16\u8bd1\u62a5\u9519\uff09<\/li>\n<\/ol>\n\n\n\n
        4.3 \u5b8c\u6574\u7684 Student \u7c7b<\/h3>\n\n\n\n
        \u628a\u524d\u9762\u5b66\u5230\u7684\u5c01\u88c5\u77e5\u8bc6\u7ed3\u5408\u8d77\u6765\uff0c\u5b9e\u73b0\u4e00\u4e2a\u5b8c\u6574\u7684 Student<\/code> \u7c7b\uff1a<\/p>\n\n\n
        public class Student {\n    private String name;\n    private int age;\n    private String studentId;\n    private double score;\n    \n    \/\/ \u5e26\u6821\u9a8c\u7684\u6838\u5fc3\u6784\u9020\u5668\n    public Student(String name, int age, String studentId, double score) {\n        setName(name);  \/\/ \u8c03\u7528 setter \u590d\u7528\u6821\u9a8c\u903b\u8f91\n        setAge(age);\n        setStudentId(studentId);\n        setScore(score);\n    }\n    \n    \/\/ \u59d4\u6258\u5230\u6838\u5fc3\u6784\u9020\u5668\n    public Student(String name, int age) {\n        this(name, age, \"\u5f85\u5206\u914d\", 0);\n    }\n    \n    public Student() {\n        this(\"\u672a\u77e5\", 18);\n    }\n    \n    \/\/ getter\/setter \u5e26\u6821\u9a8c\n    public String getName() { return name; }\n    \n    public void setName(String name) {\n        if (name == null || name.trim().isEmpty()) {\n            throw new IllegalArgumentException(\"\u59d3\u540d\u4e0d\u80fd\u4e3a\u7a7a\uff01\");\n        }\n        this.name = name;\n    }\n    \n    public int getAge() { return age; }\n    \n    public void setAge(int age) {\n        if (age  60) {\n            throw new IllegalArgumentException(\"\u5e74\u9f84\u5fc5\u987b\u57286~60\u4e4b\u95f4\uff01\");\n        }\n        this.age = age;\n    }\n    \n    public String getStudentId() { return studentId; }\n    \n    public void setStudentId(String studentId) {\n        if (studentId == null || !studentId.matches(\"\\d{8}\")) {\n            throw new IllegalArgumentException(\"\u5b66\u53f7\u5fc5\u987b\u4e3a8\u4f4d\u6570\u5b57\uff01\");\n        }\n        this.studentId = studentId;\n    }\n    \n    public double getScore() { return score; }\n    \n    public void setScore(double score) {\n        if (score  100) {\n            throw new IllegalArgumentException(\"\u6210\u7ee9\u5fc5\u987b\u57280~100\u4e4b\u95f4\uff01\");\n        }\n        this.score = score;\n    }\n    \n    public void showInfo() {\n        System.out.println(\"===== \u5b66\u751f\u4fe1\u606f =====\");\n        System.out.println(\"\u59d3\u540d\uff1a\" + name);\n        System.out.println(\"\u5e74\u9f84\uff1a\" + age);\n        System.out.println(\"\u5b66\u53f7\uff1a\" + studentId);\n        System.out.println(\"\u6210\u7ee9\uff1a\" + score);\n        System.out.println(\"\u7b49\u7ea7\uff1a\" + getGrade());\n        System.out.println(\"===================\");\n    }\n    \n    private String getGrade() {\n        if (score >= 90) return \"\u4f18\";\n        if (score >= 80) return \"\u826f\";\n        if (score >= 70) return \"\u4e2d\";\n        if (score >= 60) return \"\u53ca\u683c\";\n        return \"\u4e0d\u53ca\u683c\";\n    }\n}<\/code><\/pre>\n\n\n
        \u4e94\u3001\u7efc\u5408\u6848\u4f8b\uff1a\u94f6\u884c\u8d26\u6237\u7c7b<\/h2>\n\n\n\n
        \u4e0b\u9762\u8bbe\u8ba1\u4e00\u4e2a\u7b80\u5355\u7684\u94f6\u884c\u8d26\u6237\u7c7b\uff0c\u7efc\u5408\u8fd0\u7528\u5c01\u88c5\u3001\u6784\u9020\u5668\u548c\u6784\u9020\u5668\u91cd\u8f7d\uff1a<\/p>\n\n\n
        public class BankAccount {\n    private String accountNo;    \/\/ \u8d26\u53f7\n    private String ownerName;    \/\/ \u6237\u4e3b\u59d3\u540d\n    private double balance;      \/\/ \u4f59\u989d\n    private double annualRate;   \/\/ \u5e74\u5229\u7387\uff08\u767e\u5206\u6bd4\uff0c\u59823.5\uff09\n    \n    \/\/ \u6838\u5fc3\u6784\u9020\u5668\n    public BankAccount(String accountNo, String ownerName, \n                       double balance, double annualRate) {\n        this.accountNo = accountNo;\n        this.ownerName = ownerName;\n        this.balance = balance;\n        this.annualRate = annualRate;\n    }\n    \n    \/\/ \u5f00\u6237\uff08\u9ed8\u8ba4\u4f59\u989d\u4e3a0\uff0c\u5229\u7387\u6309\u57fa\u51c6\uff09\n    public BankAccount(String accountNo, String ownerName) {\n        this(accountNo, ownerName, 0, 2.5);\n    }\n    \n    \/\/ \u9ed8\u8ba4\u6784\u9020\u5668\uff08\u9884\u7559\uff09\n    public BankAccount() {\n        this(\"\u672a\u5f00\u6237\", \"\u672a\u77e5\", 0, 0);\n    }\n    \n    \/\/ getter \/ setter\n    public String getAccountNo() { return accountNo; }\n    public String getOwnerName() { return ownerName; }\n    public double getBalance() { return balance; }\n    \n    public void setAnnualRate(double annualRate) {\n        if (annualRate  10) {\n            System.out.println(\"\u5e74\u5229\u7387\u5fc5\u987b\u57280~10\u4e4b\u95f4\uff01\");\n            return;\n        }\n        this.annualRate = annualRate;\n    }\n    \n    public double getAnnualRate() { return annualRate; }\n    \n    \/\/ \u5b58\u6b3e\n    public void deposit(double amount) {\n        if (amount <= 0) {\n            System.out.println("\u5b58\u6b3e\u91d1\u989d\u5fc5\u987b\u5927\u4e8e0\uff01");\n            return;\n        }\n        balance += amount;\n        System.out.println("\u5b58\u6b3e\u6210\u529f\uff0c\u5f53\u524d\u4f59\u989d\uff1a" + balance + " \u5143");\n    }\n    \n    \/\/ \u53d6\u6b3e\n    public void withdraw(double amount) {\n        if (amount  balance) {\n            System.out.println(\"\u4f59\u989d\u4e0d\u8db3\uff01\u5f53\u524d\u4f59\u989d\uff1a\" + balance + \" \u5143\");\n            return;\n        }\n        balance -= amount;\n        System.out.println(\"\u53d6\u6b3e\u6210\u529f\uff0c\u5f53\u524d\u4f59\u989d\uff1a\" + balance + \" \u5143\");\n    }\n    \n    \/\/ \u8ba1\u7b97\u5e74\u5229\u606f\n    public double calcYearlyInterest() {\n        return balance * annualRate \/ 100;\n    }\n    \n    public void showInfo() {\n        System.out.println(\"===== \u94f6\u884c\u8d26\u6237 =====\");\n        System.out.println(\"\u8d26\u53f7\uff1a\" + accountNo);\n        System.out.println(\"\u6237\u4e3b\uff1a\" + ownerName);\n        System.out.println(\"\u4f59\u989d\uff1a\" + balance + \" \u5143\");\n        System.out.println(\"\u5e74\u5229\u7387\uff1a\" + annualRate + \"%\");\n        System.out.println(\"\u9884\u8ba1\u5e74\u5229\u606f\uff1a\" + calcYearlyInterest() + \" \u5143\");\n        System.out.println(\"===================\");\n    }\n}<\/code><\/pre>\n\n\n
        \u6d4b\u8bd5\u4ee3\u7801\uff1a<\/p>\n\n\n
        public class TestBank {\n    public static void main(String[] args) {\n        \/\/ \u5f00\u6237\n        BankAccount acc = new BankAccount(\"6222021234567890\", \"\u5f20\u4e09\", 10000, 3.5);\n        acc.showInfo();\n        \n        System.out.println(\"n--- \u5b58\u6b3e\u64cd\u4f5c ---\");\n        acc.deposit(5000);\n        \n        System.out.println(\"n--- \u53d6\u6b3e\u64cd\u4f5c ---\");\n        acc.withdraw(2000);\n        acc.withdraw(20000);  \/\/ \u4f59\u989d\u4e0d\u8db3\n        \n        System.out.println(\"n--- \u6700\u7ec8\u4fe1\u606f ---\");\n        acc.showInfo();\n    }\n}<\/code><\/pre>\n\n\n
        \u8f93\u51fa\uff1a<\/p>\n\n\n\n
        ===== \u94f6\u884c\u8d26\u6237 =====\n\u8d26\u53f7\uff1a6222021234567890\n\u6237\u4e3b\uff1a\u5f20\u4e09\n\u4f59\u989d\uff1a10000.0 \u5143\n\u5e74\u5229\u7387\uff1a3.5%\n\u9884\u8ba1\u5e74\u5229\u606f\uff1a350.0 \u5143\n===================\n\n--- \u5b58\u6b3e\u64cd\u4f5c ---\n\u5b58\u6b3e\u6210\u529f\uff0c\u5f53\u524d\u4f59\u989d\uff1a15000.0 \u5143\n\n--- \u53d6\u6b3e\u64cd\u4f5c ---\n\u53d6\u6b3e\u6210\u529f\uff0c\u5f53\u524d\u4f59\u989d\uff1a13000.0 \u5143\n\u4f59\u989d\u4e0d\u8db3\uff01\u5f53\u524d\u4f59\u989d\uff1a13000.0 \u5143\n\n--- \u6700\u7ec8\u4fe1\u606f ---\n===== \u94f6\u884c\u8d26\u6237 =====\n\u8d26\u53f7\uff1a6222021234567890\n\u6237\u4e3b\uff1a\u5f20\u4e09\n\u4f59\u989d\uff1a13000.0 \u5143\n\u5e74\u5229\u7387\uff1a3.5%\n\u9884\u8ba1\u5e74\u5229\u606f\uff1a455.0 \u5143\n===================<\/code><\/pre>\n\n\n\n
        \u7ed3\u8bed<\/h2>\n\n\n\n
        \u672c\u7ae0\u6211\u4eec\u6df1\u5165\u5b66\u4e60\u4e86\u6784\u9020\u5668\u7684\u65b9\u65b9\u9762\u9762\uff1a<\/p>\n\n\n\n
          \n
        • \u6784\u9020\u5668\u7684\u5b9a\u4e49\u548c\u4f7f\u7528<\/li>\n\n\n\n
        • \u9ed8\u8ba4\u6784\u9020\u5668\u7684\u81ea\u52a8\u751f\u6210\u89c4\u5219<\/li>\n\n\n\n
        • \u65e0\u53c2\u6784\u9020\u5668\u4e0e\u5e26\u53c2\u6784\u9020\u5668<\/li>\n\n\n\n
        • \u6784\u9020\u5668\u91cd\u8f7d\u63d0\u4f9b\u591a\u79cd\u521d\u59cb\u5316\u65b9\u5f0f<\/li>\n\n\n\n
        • this()<\/code> \u8c03\u7528\u907f\u514d\u91cd\u590d\u4ee3\u7801<\/li>\n\n\n\n
        • \u7efc\u5408\u6848\u4f8b\u6f14\u793a\u5b8c\u6574\u5b9e\u8df5<\/li>\n<\/ul>\n\n\n\n
          \u638c\u63e1\u4e86\u7c7b\u3001\u5c01\u88c5\u3001\u6784\u9020\u5668\u4e4b\u540e\uff0c\u4f60\u5df2\u7ecf\u80fd\u8bbe\u8ba1\u51fa\u5065\u58ee\u7684 Java \u7c7b\u4e86\u3002\u4e0b\u4e00\u7bc7\u6587\u7ae0\u6211\u4eec\u5c06\u7ee7\u7eed\u63a2\u8ba8 Java \u9762\u5411\u5bf9\u8c61\u7684\u5176\u4ed6\u57fa\u7840\u8bbe\u65bd\uff1a\u5305\u673a\u5236<\/strong>\u3001\u8bbf\u95ee\u6743\u9650<\/strong>\u3001static \u5173\u952e\u5b57<\/strong>\uff0c\u5e76\u901a\u8fc7\u4e00\u4e2a\u7efc\u5408\u6848\u4f8b\u628a\u8fd9\u4e00\u9636\u6bb5\u7684\u77e5\u8bc6\u878d\u4f1a\u8d2f\u901a\u3002<\/p>\n\n\n\n
          \u656c\u8bf7\u671f\u5f85\uff01<\/p>\n","protected":false},"excerpt":{"rendered":"
          \u4e0a\u4e00\u7bc7\u6587\u7ae0\u4e2d\uff0c\u6211\u4eec\u7528 new Student() \u521b\u5efa\u4e86\u4e00\u4e2a\u5b66\u751f\u5bf9\u8c61\uff0c\u7136\u540e\u901a\u8fc7 setter \u65b9\u6cd5\u9010\u4e2a\u8bbe\u7f6e\u5c5e\u6027 […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[35,65,10],"tags":[61,87,88,86],"class_list":["post-230","post","type-post","status-publish","format-standard","hentry","category-03-","category-01-class-encapsulation","category-javase","tag-java","tag-87","tag-88","tag-86"],"_links":{"self":[{"href":"https:\/\/ssjava.xyz\/index.php\/wp-json\/wp\/v2\/posts\/230","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/ssjava.xyz\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/ssjava.xyz\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/ssjava.xyz\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/ssjava.xyz\/index.php\/wp-json\/wp\/v2\/comments?post=230"}],"version-history":[{"count":3,"href":"https:\/\/ssjava.xyz\/index.php\/wp-json\/wp\/v2\/posts\/230\/revisions"}],"predecessor-version":[{"id":251,"href":"https:\/\/ssjava.xyz\/index.php\/wp-json\/wp\/v2\/posts\/230\/revisions\/251"}],"wp:attachment":[{"href":"https:\/\/ssjava.xyz\/index.php\/wp-json\/wp\/v2\/media?parent=230"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/ssjava.xyz\/index.php\/wp-json\/wp\/v2\/categories?post=230"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/ssjava.xyz\/index.php\/wp-json\/wp\/v2\/tags?post=230"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}