{"id":2240,"date":"2025-03-02T11:18:04","date_gmt":"2025-03-02T03:18:04","guid":{"rendered":"https:\/\/www.laixuexila.com\/?p=2240"},"modified":"2025-03-02T11:18:04","modified_gmt":"2025-03-02T03:18:04","slug":"java-%e5%8c%85-package","status":"publish","type":"post","link":"https:\/\/www.laixuexila.com\/index.php\/2025\/03\/02\/java-%e5%8c%85-package\/","title":{"rendered":"Java \u5305 (Package)"},"content":{"rendered":"\n

\u5728 Java \u4e2d\uff0c\u5305<\/strong>\uff08Package\uff09\u662f\u4e00\u79cd\u7ec4\u7ec7\u7c7b\u548c\u63a5\u53e3\u7684\u673a\u5236\u3002\u5305\u5141\u8bb8\u6211\u4eec\u5c06\u76f8\u5173\u7684\u7c7b\u3001\u63a5\u53e3\u548c\u5b50\u5305\u7ec4\u7ec7\u5728\u4e00\u8d77\uff0c\u4f7f\u5f97\u4ee3\u7801\u66f4\u52a0\u6a21\u5757\u5316\u3001\u6613\u4e8e\u7ba1\u7406\u548c\u7ef4\u62a4\u3002\u5305\u63d0\u4f9b\u4e86\u8bbf\u95ee\u63a7\u5236\uff08\u53ef\u4ee5\u63a7\u5236\u7c7b\u3001\u63a5\u53e3\u7684\u8bbf\u95ee\u6743\u9650\uff09\uff0c\u5e76\u4e14\u53ef\u4ee5\u907f\u514d\u7c7b\u540d\u51b2\u7a81\u3002<\/p>\n\n\n\n

1. \u5305\u7684\u4f5c\u7528<\/strong><\/h3>\n\n\n\n
    \n
  • \u547d\u540d\u7a7a\u95f4\u7ba1\u7406<\/strong>\uff1a\u5305\u4e3a\u7c7b\u3001\u63a5\u53e3\u548c\u5b50\u5305\u63d0\u4f9b\u4e86\u4e00\u4e2a\u547d\u540d\u7a7a\u95f4\uff0c\u4ece\u800c\u907f\u514d\u7c7b\u540d\u51b2\u7a81\u3002\u4f8b\u5982\uff0c\u5728\u4e0d\u540c\u7684\u5305\u4e2d\uff0c\u53ef\u4ee5\u6709\u76f8\u540c\u540d\u79f0\u7684\u7c7b\u3002<\/li>\n\n\n\n
  • \u8bbf\u95ee\u63a7\u5236<\/strong>\uff1a\u5305\u8fd8\u53ef\u4ee5\u63d0\u4f9b\u8bbf\u95ee\u63a7\u5236\uff0c\u7c7b\u3001\u63a5\u53e3\u3001\u5b57\u6bb5\u548c\u65b9\u6cd5\u7684\u8bbf\u95ee\u7ea7\u522b\u53ef\u4ee5\u6839\u636e\u5b83\u4eec\u6240\u5c5e\u7684\u5305\u6765\u8fdb\u884c\u9650\u5236\u3002<\/li>\n\n\n\n
  • \u4ee3\u7801\u7684\u7ec4\u7ec7\u548c\u6a21\u5757\u5316<\/strong>\uff1a\u5c06\u529f\u80fd\u76f8\u5173\u7684\u7c7b\u548c\u63a5\u53e3\u7ec4\u7ec7\u5728\u540c\u4e00\u4e2a\u5305\u4e2d\uff0c\u4fbf\u4e8e\u4ee3\u7801\u7684\u7ba1\u7406\u548c\u5f00\u53d1\u3002<\/li>\n<\/ul>\n\n\n\n

    2. \u5305\u7684\u58f0\u660e<\/strong><\/h3>\n\n\n\n

    \u6bcf\u4e2a Java \u6587\u4ef6\u53ef\u4ee5\u5305\u542b\u4e00\u4e2a\u5305\u58f0\u660e\u3002\u5305\u58f0\u660e\u5e94\u8be5\u662f\u6587\u4ef6\u7684\u7b2c\u4e00\u884c\u4ee3\u7801\uff0c\u8bed\u6cd5\u5982\u4e0b\uff1a<\/p>\n\n\n\n

    package \u5305\u540d;<\/code><\/pre>\n\n\n\n
    \u5305\u540d\u901a\u5e38\u4f7f\u7528\u5c0f\u5199\u5b57\u6bcd<\/strong>\uff0c\u4ee5\u907f\u514d\u4e0e\u7c7b\u540d\u51b2\u7a81\u3002<\/p>\n\n\n\n
    \u793a\u4f8b\uff1a<\/h4>\n\n\n\n
    package com.example.project;\n\npublic class HelloWorld {\n    public static void main(String[] args) {\n        System.out.println(\"Hello, World!\");\n    }\n}<\/code><\/pre>\n\n\n\n
    \u8fd9\u91cc\uff0ccom.example.project<\/code> \u662f\u5305\u540d\uff0cHelloWorld<\/code> \u662f\u5728\u8be5\u5305\u4e2d\u7684\u7c7b\u3002<\/p>\n\n\n\n
    3. \u5305\u7684\u76ee\u5f55\u7ed3\u6784<\/strong><\/h3>\n\n\n\n
    \u5728 Java \u4e2d\uff0c\u5305\u7ed3\u6784\u901a\u5e38\u4e0e\u6587\u4ef6\u7cfb\u7edf\u4e2d\u7684\u76ee\u5f55\u7ed3\u6784\u76f8\u5bf9\u5e94\u3002\u6bcf\u4e2a\u5305\u4e2d\u7684\u7c7b\u90fd\u4f1a\u5bf9\u5e94\u5230\u4e00\u4e2a\u6587\u4ef6\u5939\u4e2d\u3002\u4f8b\u5982\uff1a<\/p>\n\n\n\n
      \n
    • \u5982\u679c\u6709\u4e00\u4e2a\u5305 com.example.project<\/code>\uff0c\u90a3\u4e48\u6587\u4ef6 HelloWorld.java<\/code> \u5e94\u8be5\u4f4d\u4e8e\u8def\u5f84 com\/example\/project\/HelloWorld.java<\/code> \u4e2d\u3002<\/li>\n<\/ul>\n\n\n\n
      4. \u5305\u7684\u5206\u7c7b<\/strong><\/h3>\n\n\n\n
        \n
      • \u5185\u7f6e\u5305<\/strong>\uff1aJava \u63d0\u4f9b\u4e86\u4e00\u4e9b\u6807\u51c6\u7684\u5185\u7f6e\u5305\uff0c\u5305\u542b\u5927\u91cf\u7684\u7c7b\u548c\u63a5\u53e3\uff0c\u7528\u4e8e\u5b8c\u6210\u5e38\u89c1\u7684\u4efb\u52a1\u3002\u4f8b\u5982\uff1a<\/li>\n\n\n\n
      • java.lang<\/code>\uff1a\u5305\u542b Java \u6838\u5fc3\u7c7b\uff0c\u5982 String<\/code>\u3001Math<\/code>\u3001System<\/code> \u7b49\uff08\u81ea\u52a8\u5bfc\u5165\uff0c\u65e0\u9700\u663e\u5f0f\u58f0\u660e\uff09\u3002<\/li>\n\n\n\n
      • java.util<\/code>\uff1a\u5305\u542b\u5e38\u7528\u5de5\u5177\u7c7b\uff0c\u5982 ArrayList<\/code>\u3001HashMap<\/code>\u3001Date<\/code> \u7b49\u3002<\/li>\n\n\n\n
      • java.io<\/code>\uff1a\u63d0\u4f9b\u8f93\u5165\/\u8f93\u51fa\u76f8\u5173\u7684\u7c7b\uff0c\u5982 File<\/code>\u3001BufferedReader<\/code>\u3001PrintWriter<\/code> \u7b49\u3002<\/li>\n\n\n\n
      • \u7528\u6237\u81ea\u5b9a\u4e49\u5305<\/strong>\uff1a\u7528\u6237\u53ef\u4ee5\u6839\u636e\u9700\u8981\u521b\u5efa\u81ea\u5df1\u7684\u5305\uff0c\u7528\u4e8e\u7ec4\u7ec7\u76f8\u5173\u7c7b\u3002<\/li>\n<\/ul>\n\n\n\n
        5. \u4f7f\u7528\u5305\u4e2d\u7684\u7c7b<\/strong><\/h3>\n\n\n\n
        \u5728\u5176\u4ed6\u7c7b\u4e2d\u4f7f\u7528\u5305\u4e2d\u7684\u7c7b\u65f6\uff0c\u9700\u8981\u4f7f\u7528 import<\/code> \u8bed\u53e5\u6765\u5bfc\u5165\u3002<\/p>\n\n\n\n
        5.1 \u5bfc\u5165\u6574\u4e2a\u5305<\/strong><\/h4>\n\n\n\n
        \u4f7f\u7528 import<\/code> \u8bed\u53e5\u5bfc\u5165\u5305\u4e2d\u7684\u6240\u6709\u7c7b\uff1a<\/p>\n\n\n\n
        import java.util.*;  \/\/ \u5bfc\u5165java.util\u5305\u4e2d\u7684\u6240\u6709\u7c7b\n\npublic class Demo {\n    public static void main(String[] args) {\n        java.util.ArrayList<String> list = new java.util.ArrayList<>();\n        list.add(\"Java\");\n        System.out.println(list);\n    }\n}<\/code><\/pre>\n\n\n\n
        5.2 \u5bfc\u5165\u5355\u4e2a\u7c7b<\/strong><\/h4>\n\n\n\n
        \u5982\u679c\u53ea\u9700\u8981\u5bfc\u5165\u67d0\u4e2a\u7c7b\uff0c\u5219\u53ef\u4ee5\u6307\u5b9a\u7c7b\u540d\uff1a<\/p>\n\n\n\n
        import java.util.ArrayList;  \/\/ \u53ea\u5bfc\u5165ArrayList\u7c7b\n\npublic class Demo {\n    public static void main(String[] args) {\n        ArrayList<String> list = new ArrayList<>();\n        list.add(\"Java\");\n        System.out.println(list);\n    }\n}<\/code><\/pre>\n\n\n\n
        5.3 \u5bfc\u5165\u540c\u4e00\u5305\u4e0b\u7684\u7c7b<\/strong><\/h4>\n\n\n\n
        \u5982\u679c\u7c7b\u548c\u5f53\u524d\u7c7b\u5728\u540c\u4e00\u4e2a\u5305\u4e2d\uff0c\u53ef\u4ee5\u76f4\u63a5\u4f7f\u7528\u7c7b\u540d\uff0c\u800c\u65e0\u9700\u5bfc\u5165\u3002<\/p>\n\n\n\n
        6. \u5305\u7684\u8bbf\u95ee\u63a7\u5236<\/strong><\/h3>\n\n\n\n
        \u5728 Java \u4e2d\uff0c\u5305\u8fd8\u6d89\u53ca\u8bbf\u95ee\u63a7\u5236\u4fee\u9970\u7b26\u3002Java \u7684\u8bbf\u95ee\u63a7\u5236\u5305\u62ec\uff1a<\/p>\n\n\n\n
          \n
        • public<\/strong>\uff1a\u8868\u793a\u53ef\u4ee5\u5728\u4efb\u4f55\u5730\u65b9\u8bbf\u95ee\u3002<\/li>\n\n\n\n
        • protected<\/strong>\uff1a\u8868\u793a\u53ef\u4ee5\u5728\u540c\u4e00\u4e2a\u5305\u5185\u4ee5\u53ca\u7ee7\u627f\u8be5\u7c7b\u7684\u5b50\u7c7b\u4e2d\u8bbf\u95ee\u3002<\/li>\n\n\n\n
        • \u9ed8\u8ba4\uff08\u65e0\u4fee\u9970\u7b26\uff09<\/strong>\uff1a\u8868\u793a\u53ea\u80fd\u5728\u540c\u4e00\u4e2a\u5305\u5185\u8bbf\u95ee\u3002<\/li>\n\n\n\n
        • private<\/strong>\uff1a\u8868\u793a\u53ea\u80fd\u5728\u5f53\u524d\u7c7b\u4e2d\u8bbf\u95ee\u3002<\/li>\n<\/ul>\n\n\n\n
          \u793a\u4f8b\uff1a<\/h4>\n\n\n\n
          package com.example;\n\npublic class MyClass {\n    public int publicVar;\n    protected int protectedVar;\n    int defaultVar;  \/\/ \u9ed8\u8ba4\u8bbf\u95ee\u6743\u9650\n    private int privateVar;\n}<\/code><\/pre>\n\n\n\n
          7. \u5e38\u89c1\u5305\u793a\u4f8b<\/strong><\/h3>\n\n\n\n
            \n
          • \u6807\u51c6\u5305<\/strong>\uff1a<\/li>\n\n\n\n
          • java.lang<\/code>\uff1a\u81ea\u52a8\u5bfc\u5165\u7684\u5305\uff0c\u5305\u542b\u5e38\u89c1\u7684\u7c7b\uff0c\u5982 String<\/code>\u3001Math<\/code>\u3001Object<\/code>\u3002<\/li>\n\n\n\n
          • java.util<\/code>\uff1a\u5305\u542b\u5de5\u5177\u7c7b\uff0c\u5982 List<\/code>\u3001ArrayList<\/code>\u3001HashMap<\/code>\u3001Date<\/code>\u3001Collections<\/code> \u7b49\u3002<\/li>\n\n\n\n
          • java.io<\/code>\uff1a\u7528\u4e8e\u6587\u4ef6\u548c\u6570\u636e\u6d41\u7684\u8f93\u5165\u8f93\u51fa\u64cd\u4f5c\u3002<\/li>\n\n\n\n
          • java.net<\/code>\uff1a\u7528\u4e8e\u7f51\u7edc\u64cd\u4f5c\u7684\u7c7b\uff0c\u5982 Socket<\/code>\u3001URL<\/code>\u3001HttpURLConnection<\/code> \u7b49\u3002<\/li>\n\n\n\n
          • \u81ea\u5b9a\u4e49\u5305<\/strong>\uff1a<\/li>\n<\/ul>\n\n\n\n
            package com.myapp.util;\n\npublic class StringUtils {\n    public static String reverse(String str) {\n        StringBuilder sb = new StringBuilder(str);\n        return sb.reverse().toString();\n    }\n}<\/code><\/pre>\n\n\n\n
            \u53ef\u4ee5\u901a\u8fc7\u4ee5\u4e0b\u65b9\u5f0f\u5bfc\u5165\u5e76\u4f7f\u7528\uff1a<\/p>\n\n\n\n
            import com.myapp.util.StringUtils;\n\npublic class Test {\n    public static void main(String[] args) {\n        String result = StringUtils.reverse(\"Hello\");\n        System.out.println(result);\n    }\n}<\/code><\/pre>\n\n\n\n
            8. \u5305\u7684\u547d\u540d\u89c4\u5219<\/strong><\/h3>\n\n\n\n
              \n
            • \u5305\u540d\u5e94\u8be5\u5c3d\u91cf\u7b80\u77ed\u4e14\u5177\u6709\u63cf\u8ff0\u6027\uff0c\u907f\u514d\u4e0e Java \u6807\u51c6\u5e93\u4e2d\u7684\u5305\u540d\u51b2\u7a81\u3002<\/li>\n\n\n\n
            • \u5305\u540d\u5efa\u8bae\u4f7f\u7528\u516c\u53f8\u57df\u540d\u7684\u53cd\u5411\u5f62\u5f0f\uff08\u4f8b\u5982\uff1acom.companyname.projectname<\/code>\uff09\u3002<\/li>\n\n\n\n
            • \u5305\u540d\u7531\u5c0f\u5199\u5b57\u6bcd\u7ec4\u6210\uff0c\u53ef\u4ee5\u4f7f\u7528\u70b9\uff08.<\/code>\uff09\u5206\u9694\u5c42\u7ea7\u3002<\/li>\n\n\n\n
            • \u7c7b\u540d\u5e94\u8be5\u4f7f\u7528\u5927\u5199\u5b57\u6bcd\u5f00\u5934\u7684\u9a7c\u5cf0\u547d\u540d\u6cd5\uff08\u5982\uff1aMyClass<\/code>\uff09\u3002<\/li>\n<\/ul>\n\n\n\n
              9. Java \u7684\u5305\u548c\u6a21\u5757\uff08Module\uff09<\/strong><\/h3>\n\n\n\n
              \u5728 Java 9 \u4e4b\u540e\uff0cJava \u5f15\u5165\u4e86\u6a21\u5757\u7cfb\u7edf\uff08Java Platform Module System, JPMS\uff09\u3002\u6a21\u5757\u662f\u6bd4\u5305\u66f4\u9ad8\u5c42\u6b21\u7684\u7ec4\u7ec7\u7ed3\u6784\u3002\u6a21\u5757\u662f\u4e00\u4e2a\u81ea\u5305\u542b\u7684\u4ee3\u7801\u5355\u4f4d\uff0c\u53ef\u4ee5\u5305\u542b\u591a\u4e2a\u5305\u5e76\u63d0\u4f9b\u516c\u5f00\u7684 API \u548c\u63a5\u53e3\u3002<\/p>\n\n\n\n
              \u6a21\u5757\u4e0e\u5305\u6709\u76f8\u4f3c\u4e4b\u5904\uff0c\u4f46\u6a21\u5757\u63d0\u4f9b\u4e86\u66f4\u591a\u7684\u8bbf\u95ee\u63a7\u5236\uff0c\u80fd\u591f\u66f4\u660e\u786e\u5730\u5b9a\u4e49\u54ea\u4e9b\u5305\u662f\u6a21\u5757\u7684\u516c\u5171 API\uff0c\u54ea\u4e9b\u662f\u5185\u90e8\u5b9e\u73b0\u3002<\/p>\n\n\n\n
              10. \u603b\u7ed3<\/strong><\/h3>\n\n\n\n
                \n
              • \u5305<\/strong>\u662f Java \u4e2d\u7528\u6765\u7ec4\u7ec7\u7c7b\u3001\u63a5\u53e3\u7684\u65b9\u5f0f\uff0c\u53ef\u4ee5\u907f\u514d\u7c7b\u540d\u51b2\u7a81\uff0c\u5e76\u4e14\u6709\u52a9\u4e8e\u4ee3\u7801\u7684\u7ec4\u7ec7\u548c\u6a21\u5757\u5316\u3002<\/li>\n\n\n\n
              • \u5305\u540d\u662f\u6587\u4ef6\u5939\u7684\u8def\u5f84\uff0c\u7c7b\u540d\u901a\u8fc7\u5305\u540d\u6765\u907f\u514d\u51b2\u7a81\u3002<\/li>\n\n\n\n
              • \u901a\u8fc7 import<\/code> \u8bed\u53e5\u6765\u4f7f\u7528\u5176\u4ed6\u5305\u4e2d\u7684\u7c7b\uff0c\u6216\u4f7f\u7528\u5305\u7684\u5168\u8def\u5f84\u6765\u5f15\u7528\u3002<\/li>\n\n\n\n
              • Java \u6807\u51c6\u5e93<\/strong>\u4e2d\u6709\u8bb8\u591a\u9884\u5b9a\u4e49\u7684\u5305\uff0c\u5982 java.lang<\/code>\u3001java.util<\/code>\u3001java.io<\/code> \u7b49\uff0c\u5e2e\u52a9\u5f00\u53d1\u8005\u5b8c\u6210\u5e38\u89c1\u4efb\u52a1\u3002<\/li>\n<\/ul>\n\n\n\n
                \u5305\u7684\u4f7f\u7528\u4e0d\u4ec5\u6709\u52a9\u4e8e\u4ee3\u7801\u7684\u7ed3\u6784\u5316\uff0c\u4e5f\u63d0\u9ad8\u4e86\u4ee3\u7801\u7684\u53ef\u8bfb\u6027\u548c\u53ef\u7ef4\u62a4\u6027\u3002\u66f4\u591a\u8be6\u7ec6\u5185\u5bb9\u8bf7\u5173\u6ce8\u5176\u4ed6\u76f8\u5173\u6587\u7ae0\uff01<\/p>\n","protected":false},"excerpt":{"rendered":"
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