{"id":238,"date":"2026-09-13T15:59:55","date_gmt":"2026-09-13T07:59:55","guid":{"rendered":"http:\/\/117.72.184.201\/?p=238"},"modified":"2026-09-13T15:59:56","modified_gmt":"2026-09-13T07:59:56","slug":"java%e5%9f%ba%e7%a1%80%e5%b0%8f%e6%a8%a1%e5%9d%97-%e5%85%b3%e9%94%ae%e5%ad%97","status":"publish","type":"post","link":"https:\/\/jinrunshan.cn\/index.php\/2026\/09\/13\/java%e5%9f%ba%e7%a1%80%e5%b0%8f%e6%a8%a1%e5%9d%97-%e5%85%b3%e9%94%ae%e5%ad%97\/","title":{"rendered":"java\u57fa\u7840\u5c0f\u6a21\u5757\u2014\u2014\u5173\u952e\u5b57"},"content":{"rendered":"\n

\n## Java \u5173\u952e\u5b57\uff08Keyword\uff09\u6982\u5ff5\u62c6\u89e3\n\n### \u4ec0\u4e48\u662f\u5173\u952e\u5b57\n\n\u5173\u952e\u5b57\u662f Java \u8bed\u8a00**\u9884\u5148\u5b9a\u4e49**\u3001\u5177\u6709**\u56fa\u5b9a\u7279\u6b8a\u542b\u4e49**\u7684\u82f1\u6587\u5355\u8bcd\uff0c\u5168\u90e8\u7531**\u5c0f\u5199\u5b57\u6bcd**\u7ec4\u6210\u3002\u7f16\u8bd1\u5668\u9047\u5230\u5b83\u4eec\u65f6\uff0c\u4f1a\u8bc6\u522b\u4e3a\u7279\u5b9a\u8bed\u6cd5\u7ed3\u6784\u7684\u4e00\u90e8\u5206\uff0c\u800c\u4e0d\u4f1a\u5f53\u4f5c\u666e\u901a\u7684\u53d8\u91cf\u540d\u6216\u65b9\u6cd5\u540d\u6765\u5904\u7406\u3002\n\n\u5173\u952e\u5b57\u6709\u4e09\u5927\u7279\u5f81\uff1a\n\n1. **\u5c0f\u5199**\u2014\u2014`class` \u662f\u5173\u952e\u5b57\uff0c\u800c `Class` \u4e0d\u662f\uff08\u5b83\u662f\u7c7b\u540d\uff0c\u9996\u5b57\u6bcd\u5927\u5199\uff09\u3002\n2. **\u4e0d\u80fd\u7528\u4f5c\u6807\u8bc6\u7b26**\u2014\u2014\u4f60\u65e0\u6cd5\u7ed9\u53d8\u91cf\u3001\u65b9\u6cd5\u6216\u7c7b\u8d77\u540d\u4e3a `int`\u3001`void`\u3001`for` \u7b49\uff0c\u5426\u5219\u7f16\u8bd1\u76f4\u63a5\u62a5\u9519\u3002\n3. **\u542b\u4e49\u56fa\u5b9a**\u2014\u2014\u6bcf\u4e2a\u5173\u952e\u5b57\u7684\u610f\u4e49\u7531\u8bed\u8a00\u89c4\u8303\u51b3\u5b9a\uff0c\u65e0\u6cd5\u91cd\u5b9a\u4e49\u6216\u8986\u76d6\u3002\n\n\u7528\u6d41\u7a0b\u56fe\u6982\u62ec\u5173\u952e\u5b57\u5728 Java \u8bed\u6cd5\u4f53\u7cfb\u4e2d\u7684\u4f4d\u7f6e\uff1a\n\n```mermaid\nflowchart LR\n    A[Java \u6e90\u7a0b\u5e8f] --> B[\u5173\u952e\u5b57 Keyword]\n    A --> C[\u6807\u8bc6\u7b26 Identifier]\n    A --> D[\u5b57\u9762\u91cf Literal]\n    A --> E[\u8fd0\u7b97\u7b26 Operator]\n    B --> F[\u6784\u6210\u8bed\u6cd5\u7ed3\u6784\u9aa8\u67b6]\n    C --> F\n    D --> F\n    E --> F\n    F --> G[\u7f16\u8bd1\u5668\u89e3\u6790\u5e76\u751f\u6210\u5b57\u8282\u7801]\n```\n\n<\/pre>\n\n\n\n
\u4e00\u3001class\uff1a\u7c7b\u7684\u58f0\u660e\u5173\u952e\u5b57<\/h3>\n\n\n\n
\u4e3b\u9898\u5185\u5bb9<\/h4>\n\n\n\n
class<\/code> \u662f Java \u4e2d\u6700\u6838\u5fc3\u7684\u5173\u952e\u5b57\uff0c\u7528\u4e8e\u58f0\u660e\u4e00\u4e2a\u7c7b<\/strong>\u3002\u7c7b\u662f Java \u7a0b\u5e8f\u7684\u57fa\u672c\u7ec4\u7ec7\u5355\u4f4d\uff0c\u6240\u6709\u4ee3\u7801\u90fd\u5fc5\u987b\u5199\u5728\u67d0\u4e2a\u7c7b\u5f53\u4e2d\u3002<\/p>\n\n\n\n
\u6838\u5fc3\u6982\u5ff5<\/h4>\n\n\n\n
    \n
  • \u8bed\u6cd5\uff1a[\u4fee\u9970\u7b26] class \u7c7b\u540d { \u7c7b\u4f53 }<\/code><\/li>\n\n\n\n
  • \u7c7b\u540d\u4e0e\u6587\u4ef6\u540d\uff1a\u7528 public<\/code> \u4fee\u9970\u7684\u7c7b\uff0c\u5176\u7c7b\u540d\u5fc5\u987b\u4e0e\u6e90\u6587\u4ef6\u540d\u5b8c\u5168\u4e00\u81f4\uff08\u5982 HelloWorld.java<\/code> \u4e2d\u53ea\u80fd\u6709\u4e00\u4e2a public class HelloWorld<\/code>\uff09\u3002<\/li>\n<\/ul>\n\n\n\n
    \u5de5\u4f5c\u539f\u7406<\/h4>\n\n\n\n
      \n
    • class<\/code> \u544a\u8bc9\u7f16\u8bd1\u5668”\u8fd9\u662f\u4e00\u4e2a\u7c7b\u7684\u5b9a\u4e49”\u3002<\/li>\n\n\n\n
    • \u7f16\u8bd1\u540e\uff0c\u4e00\u4e2a .java<\/code> \u6587\u4ef6\u4e2d\u7684\u7c7b\u4f1a\u751f\u6210\u5bf9\u5e94\u7684 .class<\/code> \u5b57\u8282\u7801\u6587\u4ef6\uff08\u5185\u90e8\u7c7b\u4f1a\u751f\u6210\u989d\u5916\u7684 .class<\/code> \u6587\u4ef6\uff09\u3002<\/li>\n\n\n\n
    • JVM \u901a\u8fc7\u7c7b\u540d\u52a0\u8f7d\u5b57\u8282\u7801\u5e76\u6267\u884c\u5176\u4e2d\u7684 main<\/code> \u65b9\u6cd5\u4f5c\u4e3a\u7a0b\u5e8f\u5165\u53e3\u3002<\/li>\n<\/ul>\n\n\n\n
      \u793a\u4f8b<\/h4>\n\n\n\n
      \/\/ public \u4fee\u9970\u7684\u7c7b\uff0c\u7c7b\u540d\u5fc5\u987b\u4e0e\u6587\u4ef6\u540d\u4e00\u81f4\uff08HelloWorld.java\uff09
      public class HelloWorld {
          \/\/ \u7a0b\u5e8f\u5165\u53e3\u65b9\u6cd5
          public static void main(String[] args) {
              System.out.println(\"HelloWorld\");
          }
      }<\/pre>\n\n\n\n
      \n
      \u26a0\ufe0f \u6ce8\u610f\u4e8b\u9879\uff1a\u4e00\u4e2a .java<\/code> \u6587\u4ef6\u91cc\u53ef\u4ee5\u6709\u591a\u4e2a\u7c7b\uff0c\u4f46\u53ea\u80fd\u6709\u4e00\u4e2a public<\/code> \u4fee\u9970\u7684\u7c7b<\/strong>\uff0c\u4e14\u5b83\u5fc5\u987b\u4e0e\u6587\u4ef6\u540d\u540c\u540d\u3002<\/p>\n<\/blockquote>\n\n\n\n
      \n\n\n\n
      \u4e8c\u3001\u4fee\u9970\u7c7b\u4e0e\u6210\u5458\u7684\u5173\u952e\u5b57<\/h3>\n\n\n\n
      public \/ protected \/ private\uff08\u8bbf\u95ee\u63a7\u5236\uff09<\/h4>\n\n\n\n
      \u5173\u952e\u5b57<\/th>\u8bbf\u95ee\u8303\u56f4<\/th>\u5e38\u89c1\u7528\u9014<\/th><\/tr><\/thead>
      public<\/code><\/td>\u4efb\u4f55\u4f4d\u7f6e\u5747\u53ef\u8bbf\u95ee<\/td>\u7c7b\u3001\u65b9\u6cd5\u3001\u5b57\u6bb5\u5bf9\u5916\u516c\u5f00<\/td><\/tr>
      protected<\/code><\/td>\u540c\u5305 + \u5b50\u7c7b\u53ef\u8bbf\u95ee<\/td>\u4f9b\u7ee7\u627f\u4f53\u7cfb\u5185\u90e8\u4f7f\u7528<\/td><\/tr>
      private<\/code><\/td>\u4ec5\u672c\u7c7b\u5185\u90e8\u53ef\u8bbf\u95ee<\/td>\u5c01\u88c5\u5b57\u6bb5\u3001\u79c1\u6709\u65b9\u6cd5<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n
      static\uff08\u9759\u6001\uff09<\/h4>\n\n\n\n
      static<\/code> \u4fee\u9970\u7684\u6210\u5458\u5c5e\u4e8e\u7c7b\u672c\u8eab<\/strong>\uff0c\u800c\u975e\u67d0\u4e2a\u5177\u4f53\u5bf9\u8c61\uff0c\u901a\u8fc7 \u7c7b\u540d.\u6210\u5458<\/code> \u8bbf\u95ee\uff0c\u65e0\u9700\u521b\u5efa\u5b9e\u4f8b\u3002<\/p>\n\n\n\n
      public class Counter {
          public static int count = 0;   \/\/ \u9759\u6001\u53d8\u91cf\uff0c\u6240\u6709\u5b9e\u4f8b\u5171\u4eab
          public static void reset() {   \/\/ \u9759\u6001\u65b9\u6cd5
              count = 0;
          }
      }<\/pre>\n\n\n\n
      final\uff08\u6700\u7ec8\uff09<\/h4>\n\n\n\n
        \n
      • \u4fee\u9970\u53d8\u91cf\uff1a\u5e38\u91cf\uff0c\u8d4b\u503c\u540e\u4e0d\u53ef\u66f4\u6539\u3002<\/li>\n\n\n\n
      • \u4fee\u9970\u65b9\u6cd5\uff1a\u4e0d\u53ef\u88ab\u5b50\u7c7b\u91cd\u5199\u3002<\/li>\n\n\n\n
      • \u4fee\u9970\u7c7b\uff1a\u4e0d\u53ef\u88ab\u7ee7\u627f\u3002<\/li>\n<\/ul>\n\n\n\n
        abstract\uff08\u62bd\u8c61\uff09<\/h4>\n\n\n\n
          \n
        • \u4fee\u9970\u7c7b\uff1a\u62bd\u8c61\u7c7b\uff0c\u4e0d\u80fd\u5b9e\u4f8b\u5316\uff0c\u53ea\u80fd\u88ab\u7ee7\u627f\u3002<\/li>\n\n\n\n
        • \u4fee\u9970\u65b9\u6cd5\uff1a\u62bd\u8c61\u65b9\u6cd5\uff0c\u53ea\u6709\u58f0\u660e\u6ca1\u6709\u65b9\u6cd5\u4f53\uff0c\u7531\u5b50\u7c7b\u5b9e\u73b0\u3002<\/li>\n<\/ul>\n\n\n\n
          \n\n\n\n
          \u4e09\u3001\u65b9\u6cd5\u76f8\u5173\u5173\u952e\u5b57<\/h3>\n\n\n\n
          void<\/code> \u662f\u65b9\u6cd5\u8fd4\u56de\u7c7b\u578b\u5173\u952e\u5b57\uff0c\u8868\u793a\u8be5\u65b9\u6cd5\u4e0d\u8fd4\u56de\u4efb\u4f55\u503c<\/strong>\u3002\u4e0e\u4e4b\u76f8\u5bf9\u7684\uff0c\u65b9\u6cd5\u53ef\u8fd4\u56de int<\/code>\u3001double<\/code>\u3001String<\/code> \u7b49\u5177\u4f53\u7c7b\u578b\u3002<\/p>\n\n\n\n
          public class Example {
              public static void printHello() {   \/\/ \u65e0\u8fd4\u56de\u503c
                  System.out.println(\"Hello\");
              }
          \u200b
              public static int add(int a, int b) {  \/\/ \u8fd4\u56de int \u7c7b\u578b
                  return a + b;                       \/\/ return \u5173\u952e\u5b57\u7528\u4e8e\u8fd4\u56de\u7ed3\u679c
              }
          }<\/pre>\n\n\n\n
          return<\/code> \u7684\u4f5c\u7528\u6709\u4e24\u5c42\uff1a\u8fd4\u56de\u7ed3\u679c\uff0c\u5e76\u7acb\u5373\u7ed3\u675f\u65b9\u6cd5\u6267\u884c<\/strong>\u3002<\/p>\n\n\n\n
          \n\n\n\n
          \u56db\u3001\u57fa\u672c\u6570\u636e\u7c7b\u578b\u5173\u952e\u5b57<\/h3>\n\n\n\n
          Java \u7684\u516b\u79cd\u57fa\u672c\u6570\u636e\u7c7b\u578b\uff0c\u5176”\u7c7b\u578b\u540d”\u672c\u8eab\u5c31\u662f\u5173\u952e\u5b57\uff1a<\/p>\n\n\n\n
          \u7c7b\u578b<\/th>\u5173\u952e\u5b57<\/th>\u9ed8\u8ba4\u503c<\/th>\u8bf4\u660e<\/th><\/tr><\/thead>
          \u6574\u578b<\/td>byte<\/code> \/ short<\/code> \/ int<\/code> \/ long<\/code><\/td>0<\/td>\u5206\u522b\u5360 1\/2\/4\/8 \u5b57\u8282<\/td><\/tr>
          \u6d6e\u70b9\u578b<\/td>float<\/code> \/ double<\/code><\/td>0.0<\/td>\u5355\u7cbe\u5ea6 \/ \u53cc\u7cbe\u5ea6<\/td><\/tr>
          \u5b57\u7b26\u578b<\/td>char<\/code><\/td>\\u0000<\/code><\/td>\u5355\u4e2a\u5b57\u7b26<\/td><\/tr>
          \u5e03\u5c14\u578b<\/td>boolean<\/code><\/td>false<\/td>\u53ea\u6709 true \/ false<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n
          \n
          \u26a0\ufe0f \u6ce8\u610f\uff1atrue<\/code>\u3001false<\/code>\u3001null<\/code> \u4e25\u683c\u6765\u8bf4\u4e0d\u662f\u5173\u952e\u5b57\uff0c\u800c\u662f\u5b57\u9762\u91cf\uff08literal\uff09<\/strong>\uff0c\u4f46\u5b83\u4eec\u540c\u6837\u4e0d\u80fd\u7528\u4f5c\u6807\u8bc6\u7b26<\/strong>\uff08\u53d8\u91cf\u540d\u3001\u7c7b\u540d\u7b49\uff09\uff0c\u521d\u5b66\u8005\u5e38\u5728\u6b64\u6df7\u6dc6\u3002<\/p>\n<\/blockquote>\n\n\n\n
          \n\n\n\n
          \u4e94\u3001\u6d41\u7a0b\u63a7\u5236\u5173\u952e\u5b57<\/h3>\n\n\n\n
          \u7528\u4e8e\u63a7\u5236\u7a0b\u5e8f\u6267\u884c\u987a\u5e8f\uff0c\u662f\u903b\u8f91\u7ed3\u6784\u7684\u57fa\u7840\uff1a<\/p>\n\n\n\n
          \u5206\u7c7b<\/th>\u5173\u952e\u5b57<\/th><\/tr><\/thead>
          \u6761\u4ef6\u5224\u65ad<\/td>if<\/code>\u3001else<\/code>\u3001switch<\/code>\u3001case<\/code>\u3001default<\/code><\/td><\/tr>
          \u5faa\u73af<\/td>for<\/code>\u3001while<\/code>\u3001do<\/code><\/td><\/tr>
          \u8df3\u8f6c<\/td>break<\/code>\u3001continue<\/code>\u3001return<\/code><\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n
          for (int i = 0; i < 5; i++) {
              if (i == 2) {
                  continue;   \/\/ \u8df3\u8fc7\u672c\u6b21\u5faa\u73af
              }
              if (i == 4) {
                  break;      \/\/ \u7ec8\u6b62\u6574\u4e2a\u5faa\u73af
              }
              System.out.println(i);
          }<\/pre>\n\n\n\n
          \n\n\n\n
          \u516d\u3001\u5176\u4ed6\u5e38\u7528\u5173\u952e\u5b57\u901f\u89c8<\/h3>\n\n\n\n
          \u5173\u952e\u5b57<\/th>\u4f5c\u7528<\/th><\/tr><\/thead>
          new<\/code><\/td>\u521b\u5efa\u5bf9\u8c61\u5b9e\u4f8b<\/td><\/tr>
          this<\/code><\/td>\u5f15\u7528\u5f53\u524d\u5bf9\u8c61<\/td><\/tr>
          super<\/code><\/td>\u5f15\u7528\u7236\u7c7b\u6210\u5458<\/td><\/tr>
          package<\/code><\/td>\u58f0\u660e\u5305\uff08\u547d\u540d\u7a7a\u95f4\uff09<\/td><\/tr>
          import<\/code><\/td>\u5bfc\u5165\u5176\u4ed6\u5305\u4e2d\u7684\u7c7b<\/td><\/tr>
          extends<\/code><\/td>\u7c7b\u7684\u7ee7\u627f<\/td><\/tr>
          implements<\/code><\/td>\u63a5\u53e3\u7684\u5b9e\u73b0<\/td><\/tr>
          interface<\/code><\/td>\u58f0\u660e\u63a5\u53e3<\/td><\/tr>
          try<\/code> \/ catch<\/code> \/ finally<\/code><\/td>\u5f02\u5e38\u5904\u7406<\/td><\/tr>
          throw<\/code> \/ throws<\/code><\/td>\u629b\u51fa \/ \u58f0\u660e\u5f02\u5e38<\/td><\/tr>
          instanceof<\/code><\/td>\u5224\u65ad\u5bf9\u8c61\u662f\u5426\u5c5e\u4e8e\u67d0\u7c7b\u578b<\/td><\/tr>
          enum<\/code><\/td>\u58f0\u660e\u679a\u4e3e<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n
          \n\n\n\n
          \u603b\u7ed3<\/h2>\n\n\n\n
          \u5173\u952e\u5b57\u5173\u7cfb\u56fe<\/h3>\n\n\n\n
          \"\"<\/div><\/figure>\n\n\n\n
          \u6838\u5fc3\u8981\u70b9\u901f\u8bb0<\/h3>\n\n\n\n
          \u6982\u5ff5<\/th>\u4e00\u53e5\u8bdd\u603b\u7ed3<\/th><\/tr><\/thead>
          \u5173\u952e\u5b57<\/td>Java \u9884\u5b9a\u4e49\u3001\u5c0f\u5199\u3001\u6709\u56fa\u5b9a\u542b\u4e49\u3001\u4e0d\u80fd\u4f5c\u6807\u8bc6\u7b26<\/td><\/tr>
          class<\/code><\/td>\u58f0\u660e\u7c7b\uff0cpublic<\/code> \u7c7b\u7684\u7c7b\u540d\u5fc5\u987b\u4e0e\u6587\u4ef6\u540d\u4e00\u81f4<\/td><\/tr>
          public<\/code><\/td>\u6700\u5927\u8bbf\u95ee\u6743\u9650\uff0c\u4efb\u4f55\u4f4d\u7f6e\u53ef\u89c1<\/td><\/tr>
          static<\/code><\/td>\u6210\u5458\u5c5e\u4e8e\u7c7b\u672c\u8eab\uff0c\u901a\u8fc7\u7c7b\u540d\u76f4\u63a5\u8bbf\u95ee<\/td><\/tr>
          void<\/code><\/td>\u65b9\u6cd5\u65e0\u8fd4\u56de\u503c<\/td><\/tr>
          final<\/code><\/td>\u8868\u793a”\u6700\u7ec8”\uff0c\u4fee\u9970\u53d8\u91cf\/\u65b9\u6cd5\/\u7c7b<\/td><\/tr>
          abstract<\/code><\/td>\u62bd\u8c61\uff0c\u9700\u5b50\u7c7b\u5b9e\u73b0<\/td><\/tr>
          \u57fa\u672c\u7c7b\u578b\u5173\u952e\u5b57<\/td>int\u3001double\u3001char\u3001boolean \u7b49\u516b\u4e2a\u7c7b\u578b\u540d<\/td><\/tr>
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