{"id":88892,"date":"2026-08-01T23:08:30","date_gmt":"2026-08-01T15:08:30","guid":{"rendered":"https:\/\/www.wsisp.com\/helps\/88892.html"},"modified":"2026-08-01T23:08:30","modified_gmt":"2026-08-01T15:08:30","slug":"27-%e3%80%90java%e3%80%91%e5%8c%85%e4%b8%8e%e5%af%bc%e5%85%a5%ef%bc%9a%e7%bb%84%e7%bb%87%e4%bb%a3%e7%a0%81%e7%9a%84%e6%96%87%e4%bb%b6%e5%a4%b9","status":"publish","type":"post","link":"https:\/\/www.wsisp.com\/helps\/88892.html","title":{"rendered":"27. \u3010Java\u3011\u5305\u4e0e\u5bfc\u5165\uff1a\u7ec4\u7ec7\u4ee3\u7801\u7684\u201c\u6587\u4ef6\u5939\u201c"},"content":{"rendered":"

\u6458\u8981： \u672c\u6587\u6df1\u5165\u89e3\u6790Java\u5305（Package）\u548c\u5bfc\u5165（Import）\u673a\u5236，\u4ece\u547d\u540d\u51b2\u7a81\u95ee\u9898\u51fa\u53d1，\u8be6\u7ec6\u8bb2\u89e3\u5305\u7684\u58f0\u660e\u89c4\u8303\u3001\u7269\u7406\u76ee\u5f55\u7ed3\u6784\u3001import\u8bed\u53e5\u7684\u4f7f\u7528\u6280\u5de7，\u5305\u62ec\u901a\u914d\u7b26\u5bfc\u5165\u548c\u9759\u6001\u5bfc\u5165\u3002\u540c\u65f6\u4ecb\u7ecdJDK 9\u5f15\u5165\u7684\u6a21\u5757\u5316\u7cfb\u7edf（JPMS），\u5e2e\u52a9\u521d\u5b66\u8005\u7406\u89e3Java\u4ee3\u7801\u7ec4\u7ec7\u7684\u57fa\u672c\u539f\u7406\u548c\u6700\u4f73\u5b9e\u8df5\u3002\u901a\u8fc7\u7efc\u5408\u793a\u4f8b\u6f14\u793a\u5305\u3001\u5bfc\u5165\u548c\u9759\u6001\u5bfc\u5165\u7684\u5b9e\u9645\u5e94\u7528，\u4e3a\u6784\u5efa\u6e05\u6670\u3001\u53ef\u7ef4\u62a4\u7684Java\u9879\u76ee\u6253\u4e0b\u575a\u5b9e\u57fa\u7840\u3002<\/p>\n

\u5173\u952e\u8bcd： Java\u5305, import\u8bed\u53e5, \u6a21\u5757\u5316\u7cfb\u7edf, \u9759\u6001\u5bfc\u5165, \u547d\u540d\u51b2\u7a81<\/p>\n

\n

\u5728\u524d\u9762\u7684\u6587\u7ae0\u4e2d，\u4f60\u53ef\u80fd\u4f1a\u6ce8\u610f\u5230\u6211\u4eec\u5199\u7684\u6bcf\u4e2a Java \u6587\u4ef6\u5f00\u5934\u51e0\u4e4e\u90fd\u6709\u4e00\u884c package com.example.demo;\u3002\u6709\u65f6\u5019\u6211\u4eec\u4f1a\u5199 import java.util.Scanner; \u6765\u5bfc\u5165\u4e00\u4e2a\u7c7b\u3002\u4f46\u4f60\u6709\u6ca1\u6709\u60f3\u8fc7：\u4e3a\u4ec0\u4e48\u9700\u8981\u8fd9\u4e9b\u4e1c\u897f？\u5b83\u4eec\u5230\u5e95\u5728\u505a\u4ec0\u4e48？<\/p>\n

\u60f3\u8c61\u4e00\u4e0b：\u4f60\u7684\u7535\u8111\u91cc\u53ea\u6709\u4e00\u4e2a\u6587\u4ef6\u5939，\u6240\u6709\u6587\u4ef6\u90fd\u5806\u5728\u4e00\u8d77\u2014\u2014\u7167\u7247\u3001\u97f3\u4e50\u3001\u6587\u6863\u3001\u7a0b\u5e8f\u3001\u7535\u5f71\u2026\u2026\u4f60\u4f1a\u75af\u6389\u7684\u3002\u4f60\u4f1a\u6309\u7167\u7c7b\u578b\u3001\u9879\u76ee\u3001\u65e5\u671f\u628a\u5b83\u4eec\u5206\u95e8\u522b\u7c7b\u5730\u653e\u8fdb\u4e0d\u540c\u7684\u6587\u4ef6\u5939\u91cc，\u65b9\u4fbf\u67e5\u627e\u548c\u7ba1\u7406\u3002<\/p>\n

Java \u4ee3\u7801\u4e5f\u662f\u4e00\u6837\u3002\u5f53\u9879\u76ee\u53d8\u5927，\u53ef\u80fd\u5305\u542b\u51e0\u767e\u751a\u81f3\u51e0\u5343\u4e2a\u7c7b\u65f6，\u5982\u679c\u6ca1\u6709\u4e00\u79cd\u7ec4\u7ec7\u65b9\u5f0f，\u6240\u6709\u7684\u7c7b\u90fd\u653e\u5728\u4e00\u8d77，\u5c31\u50cf\u628a\u5168\u4e16\u754c\u7684\u4e66\u5806\u5728\u4e00\u4e2a\u4ed3\u5e93\u91cc\u2014\u2014\u4f60\u6c38\u8fdc\u627e\u4e0d\u5230\u4f60\u60f3\u8981\u7684\u90a3\u4e00\u672c\u3002<\/p>\n

\u5305（Package） \u5c31\u662f Java \u7528\u6765\u7ec4\u7ec7\u7c7b\u7684\u201c\u6587\u4ef6\u5939\u201d\u3002\u800c \u5bfc\u5165（Import） \u5219\u662f\u544a\u8bc9\u7f16\u8bd1\u5668\u201c\u6211\u8981\u4ece\u67d0\u4e2a\u6587\u4ef6\u5939\u91cc\u627e\u67d0\u4e2a\u7c7b\u201d\u7684\u5feb\u6377\u65b9\u5f0f\u3002<\/p>\n

\u4eca\u5929\u6211\u4eec\u5c31\u6765\u628a\u5305\u548c\u5bfc\u5165\u7684\u65b9\u65b9\u9762\u9762\u5f7b\u5e95\u8bb2\u6e05\u695a，\u5305\u62ec\u5b83\u4eec\u7684\u89c4\u8303\u3001\u7269\u7406\u7ed3\u6784\u3001\u4ee5\u53ca JDK 9 \u5f15\u5165\u7684\u6a21\u5757\u5316\u7cfb\u7edf\u3002<\/p>\n

\n

1. \u4e3a\u4ec0\u4e48\u9700\u8981\u5305？\u2014\u2014 \u4ece\u201c\u547d\u540d\u51b2\u7a81\u201d\u8bf4\u8d77<\/h4>\n

\u5047\u8bbe\u4f60\u5728\u5199\u4e00\u4e2a\u7535\u5546\u7cfb\u7edf，\u4f60\u5b9a\u4e49\u4e86\u4e00\u4e2a Order \u7c7b\u3002\u540c\u65f6，\u4f60\u5f15\u7528\u4e86\u7b2c\u4e09\u65b9\u5e93，\u8fd9\u4e2a\u5e93\u91cc\u4e5f\u6709\u4e00\u4e2a Order \u7c7b\u3002\u5982\u679c\u5b83\u4eec\u90fd\u5728\u540c\u4e00\u4e2a\u547d\u540d\u7a7a\u95f4\u91cc，\u7f16\u8bd1\u5668\u5c31\u5206\u4e0d\u6e05\u4f60\u5230\u5e95\u6307\u7684\u662f\u54ea\u4e00\u4e2a\u4e86\u2014\u2014\u8fd9\u53eb\u505a\u547d\u540d\u51b2\u7a81（Name Collision）\u3002<\/p>\n

\u5305\u89e3\u51b3\u4e86\u8fd9\u4e2a\u95ee\u9898\u3002\u4f60\u53ef\u4ee5\u628a\u4f60\u81ea\u5df1\u5199\u7684 Order \u653e\u5728 com.yourcompany.ecom.model \u5305\u91cc，\u800c\u7b2c\u4e09\u65b9\u5e93\u7684 Order \u53ef\u80fd\u5728 org.thirdparty.orderlib \u5305\u91cc\u3002\u5f53\u4f60\u60f3\u4f7f\u7528\u81ea\u5df1\u5b9a\u4e49\u7684 Order \u65f6，\u5199\u5168\u540d com.yourcompany.ecom.model.Order，\u5c31\u4e0d\u4f1a\u6709\u6b67\u4e49\u4e86\u3002<\/p>\n

\u5305\u7684\u4f5c\u7528：<\/p>\n

  • \u907f\u514d\u547d\u540d\u51b2\u7a81：\u901a\u8fc7\u5305\u540d\u6765\u533a\u5206\u540c\u540d\u7c7b\u3002<\/li>\n
  • \u63a7\u5236\u8bbf\u95ee\u6743\u9650：default（\u5305\u7ea7\u79c1\u6709）\u548c protected \u7684\u8bbf\u95ee\u8303\u56f4\u90fd\u4e0e\u5305\u6709\u5173\u3002<\/li>\n
  • \u903b\u8f91\u7ec4\u7ec7：\u628a\u529f\u80fd\u76f8\u5173\u7684\u7c7b\u653e\u5728\u540c\u4e00\u4e2a\u5305\u91cc，\u65b9\u4fbf\u7ef4\u62a4\u548c\u7406\u89e3\u3002<\/li>\n
    \n

    2. \u5305\u7684\u58f0\u660e \u2014\u2014 package \u8bed\u53e5<\/h4>\n

    \u5728 Java \u6e90\u6587\u4ef6\u7684\u5f00\u5934（\u6ce8\u91ca\u4e4b\u540e），\u7528 package \u5173\u952e\u5b57\u58f0\u660e\u8be5\u7c7b\u5c5e\u4e8e\u54ea\u4e2a\u5305\u3002<\/p>\n

    package<\/span> com.<\/span>example.<\/span>demo<\/span>;<\/span><\/p>\n

    public<\/span> class<\/span> HelloWorld<\/span> {<\/span>
    \n \/\/ …<\/span>
    \n}<\/span><\/p>\n

    \u89c4\u5219：<\/p>\n

      \n
    • package \u8bed\u53e5\u5fc5\u987b\u662f\u6e90\u6587\u4ef6\u4e2d\u7684\u7b2c\u4e00\u6761\u975e\u6ce8\u91ca\u8bed\u53e5\u3002<\/li>\n
    • \u4e00\u4e2a\u6587\u4ef6\u53ea\u80fd\u6709\u4e00\u4e2a package \u58f0\u660e\u3002<\/li>\n
    • \u5982\u679c\u7701\u7565\u4e86 package \u8bed\u53e5，\u7c7b\u5c31\u5c5e\u4e8e\u65e0\u540d\u5305（unnamed package），\u5728\u5f00\u53d1\u4e2d\u5e94\u8be5\u907f\u514d\u4f7f\u7528\u3002<\/li>\n<\/ul>\n
      \u5305\u547d\u540d\u89c4\u8303<\/h5>\n
        \n
      • \u5168\u90e8\u5c0f\u5199：\u5305\u540d\u4e00\u5f8b\u4f7f\u7528\u5c0f\u5199\u5b57\u6bcd\u3002<\/li>\n
      • \u57df\u540d\u5012\u7f6e：\u901a\u5e38\u7528\u516c\u53f8\u57df\u540d\u7684\u5012\u5e8f\u4f5c\u4e3a\u5305\u524d\u7f00，\u56e0\u4e3a\u57df\u540d\u662f\u5168\u7403\u552f\u4e00\u7684\u3002\u6bd4\u5982：\n
          \n
        • \u5982\u679c\u4f60\u7684\u57df\u540d\u662f example.com，\u5305\u540d\u4ee5 com.example \u5f00\u5934\u3002<\/li>\n
        • \u5982\u679c\u4f60\u7684\u57df\u540d\u662f github.io，\u5305\u540d\u4ee5 io.github \u5f00\u5934\u3002<\/li>\n<\/ul>\n<\/li>\n
        • \u540e\u7eed\u90e8\u5206：\u6309\u9879\u76ee\u540d\u3001\u6a21\u5757\u540d\u3001\u529f\u80fd\u5206\u5c42\u3002\u4f8b\u5982：\n
            \n
          • com.example.ecom.model \u2014\u2014 \u7535\u5546\u9879\u76ee\u7684\u6a21\u578b\u5c42<\/li>\n
          • com.example.ecom.service \u2014\u2014 \u7535\u5546\u9879\u76ee\u7684\u670d\u52a1\u5c42<\/li>\n
          • com.example.ecom.util \u2014\u2014 \u7535\u5546\u9879\u76ee\u7684\u5de5\u5177\u7c7b<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n

            \u4e3a\u4ec0\u4e48\u7528\u57df\u540d\u5012\u5e8f？\u56e0\u4e3a\u57df\u540d\u662f\u552f\u4e00\u7684，\u8fd9\u6837\u80fd\u4fdd\u8bc1\u4f60\u5199\u7684\u5305\u540d\u4e0d\u4f1a\u548c\u5176\u4ed6\u516c\u53f8\u51b2\u7a81\u3002\u6bd4\u5982 com.google \u4e00\u5b9a\u662f Google \u7684\u5305，org.apache \u4e00\u5b9a\u662f Apache \u7684\u3002<\/p>\n

            💡 \u5728\u4e2a\u4eba\u7ec3\u4e60\u9879\u76ee\u4e2d，\u4f60\u5b8c\u5168\u53ef\u4ee5\u968f\u4fbf\u547d\u540d，\u6bd4\u5982 demo\u3001test，\u4f46\u5728\u771f\u5b9e\u9879\u76ee\u4e2d，\u8bf7\u9075\u5b88\u89c4\u8303\u3002<\/p>\n

            \n

            3. \u5305\u7684\u7269\u7406\u76ee\u5f55\u7ed3\u6784<\/h4>\n

            \u5305\u540d\u4e2d\u7684 . \u5bf9\u5e94\u4e8e\u6587\u4ef6\u7cfb\u7edf\u4e2d\u7684\u76ee\u5f55\u5206\u9694\u7b26\u3002\u4f8b\u5982，\u7c7b com.example.demo.HelloWorld \u7684 .java \u6587\u4ef6\u5e94\u8be5\u4f4d\u4e8e com\/example\/demo\/HelloWorld.java\u3002<\/p>\n

            \u5728\u4f60\u7684\u9879\u76ee\u91cc，\u901a\u5e38\u4f1a\u6709\u4e00\u4e2a src\/main\/java \u6216 src \u76ee\u5f55\u4f5c\u4e3a\u6e90\u6587\u4ef6\u7684\u6839，\u7136\u540e\u5728\u8fd9\u4e2a\u6839\u4e0b\u9762\u5efa\u7acb\u5305\u5bf9\u5e94\u7684\u6587\u4ef6\u5939\u3002<\/p>\n

            \u6bd4\u5982\u4e00\u4e2a Maven \u9879\u76ee\u7684\u7ed3\u6784：<\/p>\n

            src\/
            \n main\/
            \n java\/
            \n com\/
            \n example\/
            \n demo\/
            \n HelloWorld.java
            \n util\/
            \n StringUtils.java<\/p>\n

            \u5728\u7f16\u8bd1\u65f6，\u7f16\u8bd1\u5668\u4f1a\u6839\u636e\u5305\u540d\u5728\u5bf9\u5e94\u7684\u76ee\u5f55\u4e0b\u751f\u6210 .class \u6587\u4ef6，\u4fdd\u6301\u76f8\u540c\u7684\u76ee\u5f55\u7ed3\u6784\u3002<\/p>\n

            \n

            4. \u5bfc\u5165 \u2014\u2014 import \u8bed\u53e5<\/h4>\n

            \u6bcf\u5f53\u4f60\u9700\u8981\u4f7f\u7528\u4e00\u4e2a\u4f4d\u4e8e\u5176\u4ed6\u5305\u4e2d\u7684\u7c7b\u65f6，\u4f60\u6709\u4e24\u79cd\u9009\u62e9：<\/p>\n

            \u65b9\u5f0f\u4e00：\u4f7f\u7528\u5168\u9650\u5b9a\u540d（Fully Qualified Name）<\/p>\n

            \u6bcf\u6b21\u90fd\u5199\u5b8c\u6574\u7684\u5305\u540d + \u7c7b\u540d：<\/p>\n

            public<\/span> class<\/span> Main<\/span> {<\/span>
            \n public<\/span> static<\/span> void<\/span> main<\/span>(<\/span>String<\/span>[<\/span>]<\/span> args)<\/span> {<\/span>
            \n java.<\/span>util.<\/span><\/span>ArrayList<\/span><<\/span>String<\/span>><\/span><\/span> list =<\/span> new<\/span> java.<\/span>util.<\/span><\/span>ArrayList<\/span><<\/span>><\/span><\/span>(<\/span>)<\/span>;<\/span>
            \n java.<\/span>util.<\/span><\/span>Collections<\/span>.<\/span>sort<\/span>(<\/span>list)<\/span>;<\/span>
            \n }<\/span>
            \n}<\/span><\/p>\n

            \u8fd9\u6837\u5199\u5f88\u7e41\u7410，\u5c24\u5176\u662f\u540c\u4e00\u4e2a\u7c7b\u7528\u591a\u6b21\u7684\u65f6\u5019\u3002<\/p>\n

            \u65b9\u5f0f\u4e8c：\u4f7f\u7528 import \u5bfc\u5165<\/p>\n

            \u5728\u6587\u4ef6\u5f00\u5934\u7528 import \u8bed\u53e5\u5bfc\u5165，\u7136\u540e\u5c31\u53ef\u4ee5\u76f4\u63a5\u7528\u77ed\u7c7b\u540d\u4e86\u3002<\/p>\n

            import<\/span> java.<\/span>util.<\/span><\/span>ArrayList<\/span><\/span>;<\/span>
            \nimport<\/span> java.<\/span>util.<\/span><\/span>Collections<\/span><\/span>;<\/span><\/p>\n

            public<\/span> class<\/span> Main<\/span> {<\/span>
            \n public<\/span> static<\/span> void<\/span> main<\/span>(<\/span>String<\/span>[<\/span>]<\/span> args)<\/span> {<\/span>
            \n ArrayList<\/span><<\/span>String<\/span>><\/span><\/span> list =<\/span> new<\/span> ArrayList<\/span><<\/span>><\/span><\/span>(<\/span>)<\/span>;<\/span>
            \n Collections<\/span>.<\/span>sort<\/span>(<\/span>list)<\/span>;<\/span>
            \n }<\/span>
            \n}<\/span><\/p>\n

            import \u8bed\u53e5\u4f4d\u4e8e package \u4e4b\u540e\u3001\u7c7b\u58f0\u660e\u4e4b\u524d\u3002<\/p>\n

            \u901a\u914d\u7b26\u5bfc\u5165（*）<\/h5>\n

            \u4f60\u53ef\u4ee5\u7528 import java.util.*; \u4e00\u6b21\u5bfc\u5165 java.util \u5305\u4e0b\u7684\u6240\u6709\u7c7b（\u4e0d\u5305\u62ec\u5b50\u5305）\u3002<\/p>\n

            import<\/span> java.<\/span>util.<\/span><\/span>*<\/span><\/span>;<\/span><\/p>\n

            public<\/span> class<\/span> Main<\/span> {<\/span>
            \n public<\/span> static<\/span> void<\/span> main<\/span>(<\/span>String<\/span>[<\/span>]<\/span> args)<\/span> {<\/span>
            \n ArrayList<\/span><<\/span>String<\/span>><\/span><\/span> list =<\/span> new<\/span> ArrayList<\/span><<\/span>><\/span><\/span>(<\/span>)<\/span>;<\/span>
            \n HashMap<\/span><<\/span>String<\/span>,<\/span> Integer<\/span>><\/span><\/span> map =<\/span> new<\/span> HashMap<\/span><<\/span>><\/span><\/span>(<\/span>)<\/span>;<\/span>
            \n \/\/ \u7528\u5230\u4e86\u591a\u4e2a java.util \u4e0b\u7684\u7c7b<\/span>
            \n }<\/span>
            \n}<\/span><\/p>\n

            \u901a\u914d\u7b26\u5bfc\u5165\u8ba9\u4ee3\u7801\u770b\u8d77\u6765\u66f4\u7b80\u6d01，\u4f46\u6709\u4e00\u4e9b\u4e89\u8bae：<\/p>\n

              \n
            • \u4f18\u70b9：\u5c11\u5199\u51e0\u884c\u5bfc\u5165\u8bed\u53e5\u3002<\/li>\n
            • \u7f3a\u70b9：\u53ef\u80fd\u63a9\u76d6\u4e86\u5177\u4f53\u7528\u4e86\u54ea\u4e9b\u7c7b，\u800c\u4e14\u5982\u679c\u4e24\u4e2a\u5305\u6709\u540c\u540d\u7c7b，\u901a\u914d\u7b26\u5bfc\u5165\u53ef\u80fd\u4f1a\u5bfc\u81f4\u51b2\u7a81\u3002<\/li>\n<\/ul>\n

              \u5efa\u8bae：\u5728\u5927\u591a\u6570\u5f00\u53d1\u4e2d，\u4f7f\u7528\u901a\u914d\u7b26\u5bfc\u5165\u662f\u53ef\u4ee5\u63a5\u53d7\u7684（IDEA \u9ed8\u8ba4\u4e5f\u4f1a\u6298\u53e0\u6210 *）\u3002\u4f46\u5982\u679c\u4f60\u7279\u522b\u5728\u610f\u4f9d\u8d56\u7684\u900f\u660e\u6027，\u53ef\u4ee5\u663e\u5f0f\u5bfc\u5165\u6bcf\u4e2a\u7528\u5230\u7684\u7c7b\u3002<\/p>\n

              Java \u7684\u9ed8\u8ba4\u5bfc\u5165<\/h5>\n

              \u6709\u4e24\u4e2a\u5305\u662f\u9ed8\u8ba4\u5bfc\u5165\u7684，\u4e0d\u9700\u8981\u4f60\u5199 import：<\/p>\n

                \n
              • java.lang \u5305：\u5305\u542b String\u3001System\u3001Math\u3001Object \u7b49\u6838\u5fc3\u7c7b\u3002<\/li>\n
              • \u5f53\u524d\u5305：\u4e5f\u5c31\u662f\u548c\u5f53\u524d\u7c7b\u4f4d\u4e8e\u540c\u4e00\u4e2a\u5305\u4e0b\u7684\u6240\u6709\u7c7b\u3002<\/li>\n<\/ul>\n

                \u6240\u4ee5\u4f60\u53ef\u4ee5\u76f4\u63a5\u5199 String \u800c\u4e0d\u9700\u8981 import java.lang.String;，\u76f4\u63a5\u5199\u5f53\u524d\u5305\u5185\u7684\u7c7b\u4e5f\u4e0d\u9700\u8981\u5bfc\u5165\u3002<\/p>\n

                \n

                5. \u9759\u6001\u5bfc\u5165 \u2014\u2014 import static<\/h4>\n

                \u9664\u4e86\u5bfc\u5165\u7c7b，\u4f60\u8fd8\u53ef\u4ee5\u5bfc\u5165\u4e00\u4e2a\u7c7b\u4e2d\u7684\u9759\u6001\u6210\u5458（\u9759\u6001\u5b57\u6bb5\u548c\u9759\u6001\u65b9\u6cd5），\u8fd9\u5c31\u662f \u9759\u6001\u5bfc\u5165（static import）\u3002<\/p>\n

                \u8bed\u6cd5：import static \u5305\u540d.\u7c7b\u540d.\u9759\u6001\u6210\u5458\u540d; \u6216 import static \u5305\u540d.\u7c7b\u540d.*;\u3002<\/p>\n

                \u6bd4\u5982\u6211\u4eec\u7ecf\u5e38\u7528 Math \u7c7b\u7684\u9759\u6001\u65b9\u6cd5 sqrt()\u3001pow() \u7b49\u3002\u5982\u679c\u6ca1\u6709\u9759\u6001\u5bfc\u5165，\u6211\u4eec\u9700\u8981\u5199 Math.sqrt(25)：<\/p>\n

                public<\/span> class<\/span> Main<\/span> {<\/span>
                \n public<\/span> static<\/span> void<\/span> main<\/span>(<\/span>String<\/span>[<\/span>]<\/span> args)<\/span> {<\/span>
                \n double<\/span> result =<\/span> Math<\/span>.<\/span>sqrt<\/span>(<\/span>25<\/span>)<\/span> +<\/span> Math<\/span>.<\/span>pow<\/span>(<\/span>2<\/span>,<\/span> 3<\/span>)<\/span>;<\/span>
                \n }<\/span>
                \n}<\/span><\/p>\n

                \u4f7f\u7528\u9759\u6001\u5bfc\u5165\u540e，\u53ef\u4ee5\u7701\u7565 Math.：<\/p>\n

                import<\/span> static<\/span> java.<\/span>lang.<\/span><\/span>Math<\/span>.<\/span>sqrt<\/span><\/span>;<\/span>
                \nimport<\/span> static<\/span> java.<\/span>lang.<\/span><\/span>Math<\/span>.<\/span>pow<\/span><\/span>;<\/span>
                \n\/\/ \u6216\u8005 import static java.lang.Math.*;<\/span><\/p>\n

                public<\/span> class<\/span> Main<\/span> {<\/span>
                \n public<\/span> static<\/span> void<\/span> main<\/span>(<\/span>String<\/span>[<\/span>]<\/span> args)<\/span> {<\/span>
                \n double<\/span> result =<\/span> sqrt<\/span>(<\/span>25<\/span>)<\/span> +<\/span> pow<\/span>(<\/span>2<\/span>,<\/span> 3<\/span>)<\/span>;<\/span> \/\/ \u76f4\u63a5\u4f7f\u7528，\u7701\u53bb\u4e86 Math.<\/span>
                \n }<\/span>
                \n}<\/span><\/p>\n

                \u9759\u6001\u5bfc\u5165\u5728\u67d0\u4e9b\u573a\u666f\u4e0b\u786e\u5b9e\u80fd\u63d0\u9ad8\u53ef\u8bfb\u6027，\u6bd4\u5982\u5728\u5199\u6d4b\u8bd5\u65f6\u7ecf\u5e38\u7528 assertEquals\u3001assertTrue \u7b49\u3002<\/p>\n

                \u4f46\u4e0d\u8981\u8fc7\u5ea6\u4f7f\u7528\u9759\u6001\u5bfc\u5165，\u5426\u5219\u4f1a\u8ba9\u4ee3\u7801\u53d8\u5f97\u96be\u4ee5\u9605\u8bfb\u2014\u2014\u8bfb\u8005\u53ef\u80fd\u4e0d\u77e5\u9053 sqrt \u662f\u4ece\u54ea\u91cc\u6765\u7684\u3002\u5efa\u8bae\u53ea\u5728\u4ee5\u4e0b\u60c5\u51b5\u4f7f\u7528：<\/p>\n

                  \n
                • \u9891\u7e41\u4f7f\u7528\u67d0\u4e2a\u5de5\u5177\u7c7b\u7684\u9759\u6001\u65b9\u6cd5（\u5982 Math\u3001Collections）\u3002<\/li>\n
                • \u6d4b\u8bd5\u4ee3\u7801\u4e2d（Assertions\u3001Mockito \u7b49\u6846\u67b6\u7684\u9759\u6001\u65b9\u6cd5）\u3002<\/li>\n
                • \u5b9a\u4e49\u5e38\u91cf\u7c7b\u7684\u9759\u6001\u5b57\u6bb5\u3002<\/li>\n<\/ul>\n

                  \u5728 JDK 21 \u4e2d，\u5982\u679c\u4f60\u540c\u65f6\u5bfc\u5165\u4e86\u591a\u4e2a\u540c\u540d\u7684\u9759\u6001\u6210\u5458，\u7f16\u8bd1\u5668\u4f1a\u62a5\u9519，\u9700\u8981\u4f60\u663e\u5f0f\u7528\u7c7b\u540d\u533a\u5206\u3002<\/p>\n

                  \n

                  6. \u6a21\u5757\u5316\u7cfb\u7edf（Module）\u2014\u2014 JDK 9 \u8d77\u7684\u5927\u53d8\u9769<\/h4>\n

                  \u5728 Java 9 \u4e4b\u524d，\u6240\u6709\u7684 Java \u7c7b\u90fd\u57fa\u4e8e classpath \u6765\u67e5\u627e\u3002\u4e0d\u7ba1\u4f60\u7528\u4e0d\u7528，JDK \u7684\u5168\u90e8 rt.jar（\u8fd0\u884c\u65f6\u7c7b\u5e93）\u90fd\u4f1a\u88ab\u52a0\u8f7d\u3002\u8fd9\u5728\u5927\u578b\u5e94\u7528\u4e2d\u4f1a\u5bfc\u81f4\u542f\u52a8\u6162\u3001\u5360\u7528\u5185\u5b58\u591a\u3002<\/p>\n

                  Java 9 \u5f15\u5165\u4e86\u6a21\u5757\u5316\u7cfb\u7edf（Java Platform Module System，JPMS），\u5b83\u8ba9 JDK \u672c\u8eab\u53ef\u4ee5\u88ab\u62c6\u5206\u6210\u591a\u4e2a\u6a21\u5757，\u4e5f\u5141\u8bb8\u5f00\u53d1\u8005\u4e3a\u81ea\u5df1\u7684\u5e94\u7528\u5b9a\u4e49\u6a21\u5757\u3002<\/p>\n

                  \u4ec0\u4e48\u662f\u6a21\u5757？<\/h5>\n

                  \u6a21\u5757\u662f\u4e00\u4e2a\u547d\u540d\u7684\u3001\u81ea\u63cf\u8ff0\u7684\u4ee3\u7801\u548c\u6570\u636e\u96c6\u5408\u3002\u6a21\u5757\u53ef\u4ee5：<\/p>\n

                    \n
                  • \u663e\u5f0f\u5730\u58f0\u660e\u5b83\u5bf9\u5176\u4ed6\u6a21\u5757\u7684\u4f9d\u8d56（requires）\u3002<\/li>\n
                  • \u663e\u5f0f\u5730\u58f0\u660e\u5b83\u5bfc\u51fa\u54ea\u4e9b\u5305（exports），\u4f9b\u5176\u4ed6\u6a21\u5757\u4f7f\u7528\u3002<\/li>\n
                  • \u663e\u5f0f\u5730\u58f0\u660e\u5b83\u5f00\u653e\u54ea\u4e9b\u5305\u7ed9\u53cd\u5c04（opens）\u3002<\/li>\n<\/ul>\n

                    \u6a21\u5757\u5316\u4e0d\u4ec5\u8ba9 JDK \u53ef\u4ee5\u6309\u9700\u52a0\u8f7d，\u4e5f\u4fc3\u8fdb\u4e86\u5927\u578b\u5e94\u7528\u7684\u4f9d\u8d56\u7ba1\u7406\u3002<\/p>\n

                    \u5982\u4f55\u5b9a\u4e49\u4e00\u4e2a\u6a21\u5757？<\/h5>\n

                    \u5728\u9879\u76ee\u7684\u6839\u76ee\u5f55\u4e0b\u521b\u5efa\u4e00\u4e2a module-info.java \u6587\u4ef6：<\/p>\n

                    \/\/ module-info.java<\/span>
                    \nmodule<\/span> com.<\/span>example.<\/span>demo<\/span> {<\/span>
                    \n \/\/ \u4f9d\u8d56 Java \u7684\u6838\u5fc3\u6a21\u5757<\/span>
                    \n requires<\/span> java.<\/span>base<\/span>;<\/span> \/\/ java.base \u662f\u9ed8\u8ba4\u7684，\u53ef\u7701\u7565<\/span>
                    \n requires<\/span> java.<\/span>sql<\/span>;<\/span><\/p>\n

                    \/\/ \u5bfc\u51fa\u5305，\u4f9b\u5176\u4ed6\u6a21\u5757\u4f7f\u7528<\/span>
                    \n exports<\/span> com.<\/span>example.<\/span>demo.<\/span>api<\/span>;<\/span>
                    \n exports<\/span> com.<\/span>example.<\/span>demo.<\/span>util<\/span>;<\/span><\/p>\n

                    \/\/ \u5f00\u653e\u5305\u7ed9\u53cd\u5c04（\u5982\u67d0\u4e9b\u6846\u67b6\u9700\u8981）<\/span>
                    \n opens<\/span> com.<\/span>example.<\/span>demo.<\/span>model<\/span>;<\/span>
                    \n}<\/span><\/p>\n

                    \u7136\u540e\u4f60\u7684\u5176\u4ed6\u6a21\u5757\u53ef\u4ee5\u4f9d\u8d56\u4e8e\u5b83：<\/p>\n

                    module<\/span> com.<\/span>example.<\/span>client<\/span> {<\/span>
                    \n requires<\/span> com.<\/span>example.<\/span>demo<\/span>;<\/span>
                    \n}<\/span><\/p>\n

                    \u6a21\u5757\u5316\u7684\u597d\u5904<\/h5>\n
                  • \u66f4\u5feb\u7684\u542f\u52a8\u65f6\u95f4：\u53ea\u52a0\u8f7d\u9700\u8981\u7684\u6a21\u5757\u3002<\/li>\n
                  • \u66f4\u5c0f\u7684\u8fd0\u884c\u65f6\u5360\u7528：\u4e0d\u4f7f\u7528\u7684\u5e93\u4e0d\u4f1a\u88ab\u52a0\u8f7d\u3002<\/li>\n
                  • \u66f4\u5f3a\u7684\u5c01\u88c5：\u5373\u4f7f\u540c\u4e00\u4e2a\u6a21\u5757\u5185\u7684\u7c7b，\u5982\u679c\u4e0d\u88ab\u5bfc\u51fa，\u5916\u90e8\u4e5f\u65e0\u6cd5\u8bbf\u95ee\u3002<\/li>\n
                  • \u66f4\u597d\u7684\u4f9d\u8d56\u7ba1\u7406：\u663e\u5f0f\u7684 requires \u8ba9\u4f9d\u8d56\u5173\u7cfb\u6e05\u6670\u53ef\u89c1\u3002<\/li>\n
                    \u5bf9\u4e8e\u521d\u5b66\u8005，\u6211\u9700\u8981\u5173\u5fc3\u6a21\u5757\u5417？<\/h5>\n

                    \u5728\u521d\u5b66\u9636\u6bb5，\u4f60\u53ef\u4ee5\u5148\u5ffd\u7565\u6a21\u5757\u3002\u5728\u666e\u901a\u7684\u9879\u76ee\u4e2d，\u5982\u679c\u4e0d\u5199 module-info.java，\u4f60\u7684\u7c7b\u4f1a\u88ab\u5f53\u4f5c\u201c\u672a\u547d\u540d\u6a21\u5757\u201d，\u8fd0\u884c\u5728 classpath \u6a21\u5f0f\u4e0b，\u548c Java 8 \u4e4b\u524d\u7684\u884c\u4e3a\u5b8c\u5168\u4e00\u6837\u3002<\/p>\n

                    \u7b49\u4f60\u5f00\u59cb\u5199\u5927\u578b\u5e94\u7528\u6216\u5e93\u65f6，\u518d\u6df1\u5165\u5b66\u4e60\u6a21\u5757\u5316\u4e5f\u4e0d\u8fdf\u3002\u4f46\u4e86\u89e3\u5b83\u7684\u5b58\u5728，\u80fd\u5e2e\u4f60\u7406\u89e3\u4e3a\u4ec0\u4e48 JDK 21 \u7684\u67d0\u4e9b API \u9700\u8981 requires java.sql \u8fd9\u6837\u7684\u4f9d\u8d56\u58f0\u660e\u3002<\/p>\n

                    \n

                    7. \u7efc\u5408\u793a\u4f8b \u2014\u2014 \u5305\u3001\u5bfc\u5165\u3001\u9759\u6001\u5bfc\u5165<\/h4>\n

                    \u6211\u4eec\u6765\u5199\u4e00\u4e2a\u5305\u542b\u591a\u4e2a\u5305\u7684\u793a\u4f8b，\u6f14\u793a\u5305\u58f0\u660e\u3001\u5bfc\u5165\u548c\u9759\u6001\u5bfc\u5165\u3002<\/p>\n

                    \u5047\u8bbe\u6211\u4eec\u6709\u4e24\u4e2a\u5305：<\/p>\n

                      \n
                    • com.example.demo.model：\u5305\u542b User \u7c7b\u3002<\/li>\n
                    • com.example.demo.util：\u5305\u542b\u4e00\u4e2a\u5de5\u5177\u7c7b StringUtil\u3002<\/li>\n<\/ul>\n

                      \/\/ \u6587\u4ef6: src\/main\/java\/com\/example\/demo\/model\/User.java<\/span>
                      \npackage<\/span> com.<\/span>example.<\/span>demo.<\/span>model<\/span>;<\/span> \/\/ \u5305\u58f0\u660e<\/span><\/p>\n

                      public<\/span> class<\/span> User<\/span> {<\/span>
                      \n private<\/span> String<\/span> name;<\/span>
                      \n private<\/span> int<\/span> age;<\/span><\/p>\n

                      public<\/span> User<\/span>(<\/span>String<\/span> name,<\/span> int<\/span> age)<\/span> {<\/span>
                      \n this<\/span>.<\/span>name =<\/span> name;<\/span>
                      \n this<\/span>.<\/span>age =<\/span> age;<\/span>
                      \n }<\/span><\/p>\n

                      public<\/span> String<\/span> getName<\/span>(<\/span>)<\/span> {<\/span> return<\/span> name;<\/span> }<\/span>
                      \n public<\/span> int<\/span> getAge<\/span>(<\/span>)<\/span> {<\/span> return<\/span> age;<\/span> }<\/span><\/p>\n

                      @Override<\/span>
                      \n public<\/span> String<\/span> toString<\/span>(<\/span>)<\/span> {<\/span>
                      \n return<\/span> "User{name='"<\/span> +<\/span> name +<\/span> "', age="<\/span> +<\/span> age +<\/span> "}"<\/span>;<\/span>
                      \n }<\/span>
                      \n}<\/span><\/p>\n

                      \/\/ \u6587\u4ef6: src\/main\/java\/com\/example\/demo\/util\/StringUtil.java<\/span>
                      \npackage<\/span> com.<\/span>example.<\/span>demo.<\/span>util<\/span>;<\/span><\/p>\n

                      public<\/span> class<\/span> StringUtil<\/span> {<\/span>
                      \n public<\/span> static<\/span> boolean<\/span> isBlank<\/span>(<\/span>String<\/span> s)<\/span> {<\/span>
                      \n return<\/span> s ==<\/span> null<\/span> ||<\/span> s.<\/span>trim<\/span>(<\/span>)<\/span>.<\/span>isEmpty<\/span>(<\/span>)<\/span>;<\/span>
                      \n }<\/span><\/p>\n

                      public<\/span> static<\/span> String<\/span> toUpper<\/span>(<\/span>String<\/span> s)<\/span> {<\/span>
                      \n return<\/span> s ==<\/span> null<\/span> ?<\/span> null<\/span> :<\/span> s.<\/span>toUpperCase<\/span>(<\/span>)<\/span>;<\/span>
                      \n }<\/span>
                      \n}<\/span><\/p>\n

                      \/\/ \u6587\u4ef6: src\/main\/java\/com\/example\/demo\/Main.java<\/span>
                      \npackage<\/span> com.<\/span>example.<\/span>demo<\/span>;<\/span> \/\/ \u5f53\u524d\u5305<\/span><\/p>\n

                      \/\/ \u5bfc\u5165\u5176\u4ed6\u5305\u7684\u7c7b<\/span>
                      \nimport<\/span> com.<\/span>example.<\/span>demo.<\/span>model.<\/span><\/span>User<\/span><\/span>;<\/span>
                      \nimport<\/span> com.<\/span>example.<\/span>demo.<\/span>util.<\/span><\/span>StringUtil<\/span><\/span>;<\/span><\/p>\n

                      \/\/ \u9759\u6001\u5bfc\u5165：\u5bfc\u5165 Math \u7684\u9759\u6001\u65b9\u6cd5<\/span>
                      \nimport<\/span> static<\/span> java.<\/span>lang.<\/span><\/span>Math<\/span>.<\/span>sqrt<\/span><\/span>;<\/span>
                      \nimport<\/span> static<\/span> java.<\/span>lang.<\/span><\/span>Math<\/span>.<\/span>pow<\/span><\/span>;<\/span><\/p>\n

                      public<\/span> class<\/span> Main<\/span> {<\/span>
                      \n public<\/span> static<\/span> void<\/span> main<\/span>(<\/span>String<\/span>[<\/span>]<\/span> args)<\/span> {<\/span>
                      \n \/\/ \u4f7f\u7528 model \u5305\u4e2d\u7684 User<\/span>
                      \n User<\/span> user =<\/span> new<\/span> User<\/span>(<\/span>"\u5f20\u4e09"<\/span>,<\/span> 25<\/span>)<\/span>;<\/span>
                      \n System<\/span>.<\/span>out.<\/span>println<\/span>(<\/span>user)<\/span>;<\/span><\/p>\n

                      \/\/ \u4f7f\u7528 util \u5305\u4e2d\u7684\u5de5\u5177\u65b9\u6cd5<\/span>
                      \n String<\/span> name =<\/span> user.<\/span>getName<\/span>(<\/span>)<\/span>;<\/span>
                      \n if<\/span> (<\/span>!<\/span>StringUtil<\/span>.<\/span>isBlank<\/span>(<\/span>name)<\/span>)<\/span> {<\/span>
                      \n System<\/span>.<\/span>out.<\/span>println<\/span>(<\/span>"\u59d3\u540d："<\/span> +<\/span> StringUtil<\/span>.<\/span>toUpper<\/span>(<\/span>name)<\/span>)<\/span>;<\/span>
                      \n }<\/span><\/p>\n

                      \/\/ \u4f7f\u7528\u9759\u6001\u5bfc\u5165\u7684\u65b9\u6cd5（\u4e0d\u7528\u5199 Math.）<\/span>
                      \n double<\/span> result =<\/span> sqrt<\/span>(<\/span>16<\/span>)<\/span> +<\/span> pow<\/span>(<\/span>2<\/span>,<\/span> 3<\/span>)<\/span>;<\/span>
                      \n System<\/span>.<\/span>out.<\/span>println<\/span>(<\/span>"sqrt(16) + 2^3 = "<\/span> +<\/span> result)<\/span>;<\/span>
                      \n }<\/span>
                      \n}<\/span><\/p>\n

                      \u8f93\u51fa：<\/p>\n

                      User{name='\u5f20\u4e09', age=25}
                      \n\u59d3\u540d：\u5f20\u4e09
                      \nsqrt(16) + 2^3 = 12.0<\/p>\n

                      \n

                      8. \u5e38\u89c1\u9677\u9631\u4e0e\u5efa\u8bae<\/h4>\n
                        \n
                      • \u547d\u540d\u51b2\u7a81：\u5982\u679c\u5bfc\u5165\u7684\u4e24\u4e2a\u5305\u4e2d\u6709\u540c\u540d\u7c7b（\u6bd4\u5982 java.util.Date \u548c java.sql.Date），\u4f60\u53ef\u4ee5\u7528\u5168\u9650\u5b9a\u540d\u6765\u660e\u786e\u6307\u5b9a\u3002<\/li>\n
                      • \u4e0d\u8981\u7528 import \u5bfc\u5165\u6574\u4e2a\u5305\u65f6\u5f62\u6210\u4f9d\u8d56\u5faa\u73af：\u5305\u4e4b\u95f4\u5e94\u8be5\u5f62\u6210\u6e05\u6670\u7684\u5c42\u6b21\u7ed3\u6784，\u907f\u514d\u5faa\u73af\u4f9d\u8d56\u3002<\/li>\n
                      • IDE \u81ea\u52a8\u7ba1\u7406\u5bfc\u5165：\u5728 IntelliJ IDEA \u7b49 IDE \u4e2d，\u4f60\u53ef\u4ee5\u8bbe\u7f6e\u201c\u81ea\u52a8\u5bfc\u5165\u201d，\u5b83\u4f1a\u5e2e\u4f60\u52a0 import \u5e76\u81ea\u52a8\u53bb\u6389\u672a\u4f7f\u7528\u7684，\u975e\u5e38\u65b9\u4fbf\u3002<\/li>\n
                      • \u4f7f\u7528\u6a21\u5757\u5316\u65f6\u8981\u5c0f\u5fc3\u5bfc\u51fa：\u786e\u4fdd\u4f60\u5bfc\u51fa\u4e86\u6b63\u786e\u7684\u5305，\u5426\u5219\u5176\u4ed6\u6a21\u5757\u65e0\u6cd5\u4f7f\u7528\u3002<\/li>\n<\/ul>\n
                        \n

                        9. \u4eca\u5929\u7684\u603b\u7ed3<\/h4>\n

                        \u4eca\u5929\u6211\u4eec\u5b66\u4e60\u4e86 Java \u7ec4\u7ec7\u4ee3\u7801\u7684\u9aa8\u67b6：<\/p>\n

                          \n
                        • \u5305（Package）：\u7528 package \u58f0\u660e，\u7528\u57df\u540d\u5012\u5e8f\u547d\u540d，\u5bf9\u5e94\u7269\u7406\u6587\u4ef6\u5939，\u7528\u4e8e\u7ec4\u7ec7\u7c7b\u548c\u907f\u514d\u547d\u540d\u51b2\u7a81\u3002<\/li>\n
                        • \u5bfc\u5165（Import）：\u7528 import \u5bfc\u5165\u5176\u4ed6\u5305\u7684\u7c7b\u6216\u6574\u4e2a\u5305，\u8ba9\u4ee3\u7801\u66f4\u7b80\u6d01\u3002java.lang \u548c\u5f53\u524d\u5305\u81ea\u52a8\u5bfc\u5165\u3002<\/li>\n
                        • \u9759\u6001\u5bfc\u5165（static import）：\u5bfc\u5165\u7c7b\u7684\u9759\u6001\u6210\u5458，\u8ba9\u4ee3\u7801\u5728\u67d0\u4e9b\u573a\u666f\u4e0b\u66f4\u7b80\u6d01，\u4f46\u4e0d\u8981\u6ee5\u7528\u3002<\/li>\n
                        • \u6a21\u5757\u5316\u7cfb\u7edf（Module）：JDK 9 \u5f15\u5165，\u7528 module-info.java \u58f0\u660e\u4f9d\u8d56\u548c\u5bfc\u51fa，\u521d\u5b66\u9636\u6bb5\u53ef\u6682\u4e0d\u6df1\u5165\u3002<\/li>\n
                        • \u5305\u4e0e\u8bbf\u95ee\u6743\u9650：default \u548c protected \u7684\u8bbf\u95ee\u8303\u56f4\u90fd\u4e0e\u5305\u5bc6\u5207\u76f8\u5173\u3002<\/li>\n<\/ul>\n

                          \u5305\u548c\u5bfc\u5165\u5c31\u50cf\u662f Java \u4e16\u754c\u7684\u201c\u90ae\u653f\u7f16\u7801\u201d\u548c\u201c\u901a\u8baf\u5f55\u201d\u2014\u2014\u6709\u4e86\u5b83\u4eec，\u4f60\u53ef\u4ee5\u5feb\u901f\u5b9a\u4f4d\u4efb\u4f55\u7c7b，\u4e5f\u80fd\u8ba9\u9879\u76ee\u7ed3\u6784\u6e05\u6670\u5f97\u50cf\u4e2a\u56fe\u4e66\u9986\u3002<\/p>\n

                          \n

                          \u52a8\u624b\u8bd5\u8bd5<\/h4>\n
                        • \u5728\u4f60\u7684\u9879\u76ee\u4e2d\u521b\u5efa\u4e24\u4e2a\u5305 com.example.calculator.operations \u548c com.example.calculator.utils\u3002\u628a\u52a0\u3001\u51cf\u3001\u4e58\u3001\u9664\u8fd0\u7b97\u5206\u522b\u653e\u5728 operations \u5305\u4e0b\u7684\u4e0d\u540c\u7c7b\u4e2d，\u628a\u8f93\u5165\u6821\u9a8c\u653e\u5728 utils \u5305\u4e2d\u3002\u7136\u540e\u5728 Main \u7c7b\u4e2d\u5bfc\u5165\u8fd9\u4e9b\u7c7b\u5e76\u4f7f\u7528\u3002<\/li>\n
                        • \u5c1d\u8bd5\u5199\u4e00\u4e2a import static java.lang.System.out;，\u7136\u540e\u76f4\u63a5\u5728\u4ee3\u7801\u4e2d\u7528 out.println(…) \u8f93\u51fa，\u611f\u53d7\u9759\u6001\u5bfc\u5165\u7684\u6548\u679c\u3002<\/li>\n
                        • \u5982\u679c\u540c\u65f6\u5bfc\u5165 java.util.Date \u548c java.sql.Date，\u5728\u4ee3\u7801\u4e2d\u5199 Date date = new Date(); \u4f1a\u62a5\u9519\u3002\u5c1d\u8bd5\u7528\u5168\u9650\u5b9a\u540d\u660e\u786e\u4f7f\u7528\u5176\u4e2d\u4e00\u4e2a，\u53e6\u4e00\u4e2a\u4e5f\u7528\u5168\u9650\u5b9a\u540d\u3002<\/li>\n
                        • （\u53ef\u9009）\u7814\u7a76\u4e00\u4e0b\u4f60\u9879\u76ee\u7684 src\/main\/java \u76ee\u5f55\u7ed3\u6784，\u770b\u770b\u4f60\u7684\u5305\u540d\u548c\u6587\u4ef6\u8def\u5f84\u662f\u5426\u5bf9\u5e94\u3002\u5c1d\u8bd5\u8c03\u6574\u5305\u540d，\u5e76\u4fee\u6539\u6587\u4ef6\u8def\u5f84，\u76f4\u5230\u4ee3\u7801\u80fd\u6b63\u5e38\u7f16\u8bd1\u3002<\/li>\n

                          \u4e0b\u4e00\u7bc7\u6587\u7ae0，\u6211\u4eec\u5c06\u8fdb\u5165\u4e00\u4e2a\u6bd4\u8f83\u7279\u522b\u7684\u8bdd\u9898\u2014\u2014\u9636\u6bb5\u6027\u5b9e\u6218：\u5b66\u751f\u7ba1\u7406\u7cfb\u7edf（OOP \u7248）\u3002\u6211\u4eec\u4f1a\u628a\u9762\u5411\u5bf9\u8c61\u7684\u4e09\u5927\u7279\u6027（\u5c01\u88c5\u3001\u7ee7\u627f\u3001\u591a\u6001）\u4ee5\u53ca\u6211\u4eec\u5b66\u8fc7\u7684\u5176\u4ed6\u77e5\u8bc6，\u5168\u90e8\u653e\u5230\u4e00\u4e2a\u5b8c\u6574\u9879\u76ee\u4e2d\u3002<\/p>\n

                          \u6211\u4eec\u4e0b\u4e00\u7bc7\u89c1\u3002😃<\/p>\n

                          📌 \u83b7\u53d6\u672c\u7cfb\u5217\u793a\u4f8b\u4ee3\u7801\u8bf7\u8bbf\u95ee GitCode\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"

                          \u6458\u8981： \u672c\u6587\u6df1\u5165\u89e3\u6790Java\u5305（Package）\u548c\u5bfc\u5165（Import）\u673a\u5236，\u4ece\u547d\u540d\u51b2\u7a81\u95ee\u9898\u51fa\u53d1，\u8be6\u7ec6\u8bb2\u89e3\u5305\u7684\u58f0\u660e\u89c4\u8303\u3001\u7269\u7406\u76ee\u5f55\u7ed3\u6784\u3001import\u8bed\u53e5\u7684\u4f7f\u7528\u6280\u5de7，\u5305\u62ec\u901a\u914d\u7b26\u5bfc\u5165\u548c\u9759\u6001\u5bfc\u5165\u3002\u540c\u65f6\u4ecb\u7ecdJDK 9\u5f15\u5165\u7684\u6a21\u5757\u5316\u7cfb\u7edf（JPMS），\u5e2e\u52a9\u521d\u5b66\u8005\u7406\u89e3Java\u4ee3\u7801\u7ec4\u7ec7\u7684\u57fa\u672c\u539f\u7406\u548c\u6700\u4f73\u5b9e\u8df5\u3002\u901a\u8fc7\u7efc\u5408\u793a\u4f8b\u6f14\u793a\u5305\u3001\u5bfc\u5165\u548c\u9759\u6001\u5bfc\u5165\u7684\u5b9e\u9645<\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[99,190],"topic":[],"class_list":["post-88892","post","type-post","status-publish","format-standard","hentry","category-server","tag-java","tag-190"],"yoast_head":"\n27. \u3010Java\u3011\u5305\u4e0e\u5bfc\u5165\uff1a\u7ec4\u7ec7\u4ee3\u7801\u7684\u201c\u6587\u4ef6\u5939\u201c - \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\/88892.html\" \/>\n<meta property=\"og:locale\" content=\"zh_CN\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"27. \u3010Java\u3011\u5305\u4e0e\u5bfc\u5165\uff1a\u7ec4\u7ec7\u4ee3\u7801\u7684\u201c\u6587\u4ef6\u5939\u201c - \u7f51\u7855\u4e92\u8054\u5e2e\u52a9\u4e2d\u5fc3\" \/>\n<meta property=\"og:description\" content=\"\u6458\u8981： \u672c\u6587\u6df1\u5165\u89e3\u6790Java\u5305（Package）\u548c\u5bfc\u5165（Import）\u673a\u5236，\u4ece\u547d\u540d\u51b2\u7a81\u95ee\u9898\u51fa\u53d1，\u8be6\u7ec6\u8bb2\u89e3\u5305\u7684\u58f0\u660e\u89c4\u8303\u3001\u7269\u7406\u76ee\u5f55\u7ed3\u6784\u3001import\u8bed\u53e5\u7684\u4f7f\u7528\u6280\u5de7，\u5305\u62ec\u901a\u914d\u7b26\u5bfc\u5165\u548c\u9759\u6001\u5bfc\u5165\u3002\u540c\u65f6\u4ecb\u7ecdJDK 9\u5f15\u5165\u7684\u6a21\u5757\u5316\u7cfb\u7edf（JPMS），\u5e2e\u52a9\u521d\u5b66\u8005\u7406\u89e3Java\u4ee3\u7801\u7ec4\u7ec7\u7684\u57fa\u672c\u539f\u7406\u548c\u6700\u4f73\u5b9e\u8df5\u3002\u901a\u8fc7\u7efc\u5408\u793a\u4f8b\u6f14\u793a\u5305\u3001\u5bfc\u5165\u548c\u9759\u6001\u5bfc\u5165\u7684\u5b9e\u9645\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.wsisp.com\/helps\/88892.html\" \/>\n<meta property=\"og:site_name\" content=\"\u7f51\u7855\u4e92\u8054\u5e2e\u52a9\u4e2d\u5fc3\" \/>\n<meta property=\"article:published_time\" content=\"2026-08-01T15:08:30+00:00\" \/>\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\/88892.html\",\"url\":\"https:\/\/www.wsisp.com\/helps\/88892.html\",\"name\":\"27. \u3010Java\u3011\u5305\u4e0e\u5bfc\u5165\uff1a\u7ec4\u7ec7\u4ee3\u7801\u7684\u201c\u6587\u4ef6\u5939\u201c - \u7f51\u7855\u4e92\u8054\u5e2e\u52a9\u4e2d\u5fc3\",\"isPartOf\":{\"@id\":\"https:\/\/www.wsisp.com\/helps\/#website\"},\"datePublished\":\"2026-08-01T15:08:30+00:00\",\"dateModified\":\"2026-08-01T15:08:30+00:00\",\"author\":{\"@id\":\"https:\/\/www.wsisp.com\/helps\/#\/schema\/person\/358e386c577a3ab51c4493330a20ad41\"},\"breadcrumb\":{\"@id\":\"https:\/\/www.wsisp.com\/helps\/88892.html#breadcrumb\"},\"inLanguage\":\"zh-Hans\",\"potentialAction\":[{\"@type\":\"ReadAction\",\"target\":[\"https:\/\/www.wsisp.com\/helps\/88892.html\"]}]},{\"@type\":\"BreadcrumbList\",\"@id\":\"https:\/\/www.wsisp.com\/helps\/88892.html#breadcrumb\",\"itemListElement\":[{\"@type\":\"ListItem\",\"position\":1,\"name\":\"\u9996\u9875\",\"item\":\"https:\/\/www.wsisp.com\/helps\"},{\"@type\":\"ListItem\",\"position\":2,\"name\":\"27. \u3010Java\u3011\u5305\u4e0e\u5bfc\u5165\uff1a\u7ec4\u7ec7\u4ee3\u7801\u7684\u201c\u6587\u4ef6\u5939\u201c\"}]},{\"@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":"27. \u3010Java\u3011\u5305\u4e0e\u5bfc\u5165\uff1a\u7ec4\u7ec7\u4ee3\u7801\u7684\u201c\u6587\u4ef6\u5939\u201c - \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\/88892.html","og_locale":"zh_CN","og_type":"article","og_title":"27. \u3010Java\u3011\u5305\u4e0e\u5bfc\u5165\uff1a\u7ec4\u7ec7\u4ee3\u7801\u7684\u201c\u6587\u4ef6\u5939\u201c - \u7f51\u7855\u4e92\u8054\u5e2e\u52a9\u4e2d\u5fc3","og_description":"\u6458\u8981： \u672c\u6587\u6df1\u5165\u89e3\u6790Java\u5305（Package）\u548c\u5bfc\u5165（Import）\u673a\u5236，\u4ece\u547d\u540d\u51b2\u7a81\u95ee\u9898\u51fa\u53d1，\u8be6\u7ec6\u8bb2\u89e3\u5305\u7684\u58f0\u660e\u89c4\u8303\u3001\u7269\u7406\u76ee\u5f55\u7ed3\u6784\u3001import\u8bed\u53e5\u7684\u4f7f\u7528\u6280\u5de7，\u5305\u62ec\u901a\u914d\u7b26\u5bfc\u5165\u548c\u9759\u6001\u5bfc\u5165\u3002\u540c\u65f6\u4ecb\u7ecdJDK 9\u5f15\u5165\u7684\u6a21\u5757\u5316\u7cfb\u7edf（JPMS），\u5e2e\u52a9\u521d\u5b66\u8005\u7406\u89e3Java\u4ee3\u7801\u7ec4\u7ec7\u7684\u57fa\u672c\u539f\u7406\u548c\u6700\u4f73\u5b9e\u8df5\u3002\u901a\u8fc7\u7efc\u5408\u793a\u4f8b\u6f14\u793a\u5305\u3001\u5bfc\u5165\u548c\u9759\u6001\u5bfc\u5165\u7684\u5b9e\u9645","og_url":"https:\/\/www.wsisp.com\/helps\/88892.html","og_site_name":"\u7f51\u7855\u4e92\u8054\u5e2e\u52a9\u4e2d\u5fc3","article_published_time":"2026-08-01T15:08:30+00:00","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\/88892.html","url":"https:\/\/www.wsisp.com\/helps\/88892.html","name":"27. \u3010Java\u3011\u5305\u4e0e\u5bfc\u5165\uff1a\u7ec4\u7ec7\u4ee3\u7801\u7684\u201c\u6587\u4ef6\u5939\u201c - \u7f51\u7855\u4e92\u8054\u5e2e\u52a9\u4e2d\u5fc3","isPartOf":{"@id":"https:\/\/www.wsisp.com\/helps\/#website"},"datePublished":"2026-08-01T15:08:30+00:00","dateModified":"2026-08-01T15:08:30+00:00","author":{"@id":"https:\/\/www.wsisp.com\/helps\/#\/schema\/person\/358e386c577a3ab51c4493330a20ad41"},"breadcrumb":{"@id":"https:\/\/www.wsisp.com\/helps\/88892.html#breadcrumb"},"inLanguage":"zh-Hans","potentialAction":[{"@type":"ReadAction","target":["https:\/\/www.wsisp.com\/helps\/88892.html"]}]},{"@type":"BreadcrumbList","@id":"https:\/\/www.wsisp.com\/helps\/88892.html#breadcrumb","itemListElement":[{"@type":"ListItem","position":1,"name":"\u9996\u9875","item":"https:\/\/www.wsisp.com\/helps"},{"@type":"ListItem","position":2,"name":"27. \u3010Java\u3011\u5305\u4e0e\u5bfc\u5165\uff1a\u7ec4\u7ec7\u4ee3\u7801\u7684\u201c\u6587\u4ef6\u5939\u201c"}]},{"@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\/88892","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=88892"}],"version-history":[{"count":0,"href":"https:\/\/www.wsisp.com\/helps\/wp-json\/wp\/v2\/posts\/88892\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.wsisp.com\/helps\/wp-json\/wp\/v2\/media?parent=88892"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.wsisp.com\/helps\/wp-json\/wp\/v2\/categories?post=88892"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.wsisp.com\/helps\/wp-json\/wp\/v2\/tags?post=88892"},{"taxonomy":"topic","embeddable":true,"href":"https:\/\/www.wsisp.com\/helps\/wp-json\/wp\/v2\/topic?post=88892"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}