{"id":1561,"date":"2020-11-14T09:42:33","date_gmt":"2020-11-14T01:42:33","guid":{"rendered":"https:\/\/www.yusian.com\/blog\/?p=1561"},"modified":"2020-11-17T17:41:34","modified_gmt":"2020-11-17T09:41:34","slug":"java%e5%9f%ba%e6%9c%ac%e8%af%ad%e6%b3%95%e7%9a%84%e5%87%a0%e4%b8%aa%e7%ac%94%e8%ae%b0","status":"publish","type":"post","link":"https:\/\/www.yusian.com\/blog\/java\/2020\/11\/14\/0942331561.html","title":{"rendered":"Java\u57fa\u672c\u8bed\u6cd5\u7684\u51e0\u4e2a\u7b14\u8bb0"},"content":{"rendered":"

1 \u9700\u8981\u6ce8\u610f\u7684\u70b9<\/h1>\n

1.1 \u8fd0\u7b97\u8d4b\u503c\u64cd\u4f5c<\/h2>\n
    \n
  1. \u590d\u5408\u8d4b\u503c\u8fd0\u7b97\u4e2d(\u5982\uff1a+=\u3001-=\u7b49)\uff0c\u9690\u542b\u4e86\u7c7b\u578b\u5f3a\u5236\u8f6c\u6362\u3002\u5982\uff1a\n
    byte b = 126;\n\/\/ \u6309\u5e38\u74062\u662fint\u578b\uff0cbyte + int \u7ed3\u679c\u5e94\u8be5\u662fint\uff0c\u4f46\u8fd9\u91cc\u4f1a\u5f3a\u8f6c\u4e3abyte\nb += 2;  \/\/ \u7ed3\u679c\u4f1a\u6ea2\u51fa\nSystem.out.println(b); \/\/ -128\n<\/code><\/pre>\n<\/li>\n
  2. \u4e09\u76ee\u8fd0\u7b97\u4e0d\u80fd\u5355\u72ec\u5b58\u5728\uff0c\u8fd0\u7b97\u7ed3\u679c\u5fc5\u987b\u8981\u6709\u201c\u63a5\u6536\u65b9\u201d\n
    OperationDemo.java:10: \u9519\u8bef: \u4e0d\u662f\u8bed\u53e5\n               a > b ? a : b;\n                     ^\n1 \u4e2a\u9519\u8bef\n<\/code><\/pre>\n<\/li>\n
  3. \u6574\u6570\u7c7b\u578b\u4e2dbyte\u3001short\u3001int\u3001long\u56db\u79cd\u7684\u524d\u4e09\u79cd\u5728\u8fd0\u7b97\u65f6\u90fd\u4f1a\u5148\u8f6c\u6362\u4e3aint\u7c7b\u578b\uff1b\n
    byte a = 10;\nbyte b = 20;\n\/\/ \u4e8b\u5b9e\u4e0a\u662fbyte = int + int\uff0c\u6240\u4ee5\u7f16\u8bd1\u65f6\u4f1a\u62a5\u9519\nbyte ret = a + b;\n<\/code><\/pre>\n
    OperationDemo.java:5: \u9519\u8bef: \u4e0d\u517c\u5bb9\u7684\u7c7b\u578b: \u4eceint\u8f6c\u6362\u5230byte\u53ef\u80fd\u4f1a\u6709\u635f\u5931\n               byte ret = a + b;\n                            ^\n1 \u4e2a\u9519\u8bef\n<\/code><\/pre>\n<\/li>\n
  4. \u5982\u679c\u8868\u8fbe\u5f0f\u7684\u53f3\u8fb9\u4e3a\u5e38\u91cf\uff0c\u7f16\u8bd1\u65f6\u4f1a\u5148\u5c06\u8868\u8fbe\u7684\u8fdb\u884c\u8ba1\u7b97\uff0c\u7528\u7ed3\u679c\u66ff\u6362\u539f\u6765\u7684\u8868\u8fbe\u5f0f\uff0c\u5982\uff1a\n
    \/\/ \u4e0a\u8ff0\u793a\u4f8b\u4e2dret = a + b\uff0c\u8868\u8fbe\u5f0f\u53f3\u8fb9\u662fint\u578b\uff0c\u5de6\u8fb9\u662fbyte\uff0c\u6709\u8f6c\u6362\u5931\u771f\u7684\u98ce\u9669\u6240\u4ee5\u7f16\u8bd1\u4f1a\u62a5\u9519\uff1b\n\/\/ \u4f46\u5982\u679c\u53f3\u8fb9\u662f\u5e38\u91cf\u5219\u4e0d\u4f1a\uff0cbyte ret = 10 + 20\u7c7b\u4f3c\u76f4\u63a5\u5199byte ret = 30;\nbyte ret = 10 + 20;\n<\/code><\/pre>\n<\/li>\n<\/ol>\n
    1.2 \u51fd\u6570\u4e0e\u65b9\u6cd5<\/h2>\n
      \n
    1. \u65b9\u6cd5\u91cd\u8f7d\u4e2d\u5982\u679c\u8fd4\u56de\u503c\u7c7b\u578b\u4e0d\u4e00\u6837\uff0c\u4e0d\u6784\u6210\u65b9\u6cd5\u91cd\u8f7d\u3002(\u60f3\u60f3\u770b\uff0c\u8fd4\u56de\u503c\u662f\u53ef\u4ee5\u5f3a\u5236\u7c7b\u578b\u8f6c\u6362\u7684\uff0c\u90a3\u4e48\u7f16\u8bd1\u5668\u5230\u5e95\u8be5\u7ed9\u54ea\u4e2a\u65b9\u6cd5\u5462\uff1f\u6240\u4ee5\u6b64\u5904\u6709\u6b67\u5f02)\n
      public static int sum(int a, int b) {\n   return a + b;\n}\n\/\/ \u7f16\u8bd1\u62a5\u9519\uff0c\u65b9\u6cd5\u91cd\u540d\u4e86\uff0c\u4ec5\u8fd4\u56de\u503c\u7c7b\u578b\u4e0d\u540c\u4e0d\u6784\u6210\u65b9\u6cd5\u91cd\u8f7d\npublic static float sum(int a, int b) {\n   return (float) (a + b);\n}\n<\/code><\/pre>\n<\/li>\n<\/ol>\n
      1.3 \u6570\u7ec4<\/h2>\n
        \n
      1. \u6570\u7ec4\u521d\u59cb\u5316\u7684\u51e0\u79cd\u65b9\u5f0f\uff0c\u4e3b\u8981\u6709\u9759\u6001\u521d\u59cb\u5316(\u6307\u5b9a\u503c)\u4e0e\u52a8\u6001\u521d\u59cb\u5316(\u6307\u5b9a\u957f\u5ea6)\uff1b<\/li>\n<\/ol>\n
          \n
        • \u6240\u8c13\u7684\u9759\u6001\u4e0e\u52a8\u6001\u533a\u522b\u662f\u5373\u65f6\u6307\u5b9a\u957f\u5ea6\u8fd8\u662f\u76f4\u63a5\u8d4b\u503c\uff1b<\/li>\n
        • Java\u4e2d\u6307\u5b9a\u503c\u6709\u4e24\u79cd\u65b9\u5f0f\uff0c\u4e00\u79cd\u662f\u7c7b\u578b\u524d\u7f00\uff0c\u4e00\u79cd\u4e0d\u52a0(\u6240\u8c13\u7684\u6807\u51c6\u683c\u5f0f\u4e0e\u7701\u7565\u683c\u5f0f)\uff1b<\/li>\n
        • \u5728\u5176\u4ed6\u9ad8\u7ea7\u8bed\u8a00\u4e2d\u5982C++\uff0c\u9759\u6001\u521d\u59cb\u5316\u4e0d\u80fd\u62c6\u5f00\u5199(\u5373\u7701\u7565\u683c\u5f0f)\uff0c\u4f46Java\u6807\u51c6\u683c\u5f0f\u53ef\u4ee5\uff1b<\/li>\n
        • \u52a8\u6001\u521d\u59cb\u5316\u6570\u7ec4\u65f6\uff0c\u5185\u5b58\u4e2d\u5168\u90e8\u51990<\/code>\uff0c\u5373int\u4e3a0<\/code>\u3001float\u4e3a0.0<\/code>\u3001\u5bf9\u8c61\u4e3anull<\/code>\u3001char\u4e3a\\u0000<\/code>\uff1b\n
          \/\/ \u52a8\u6001\u521d\u59cb\u5316\uff0c\u5728\u521b\u5efa\u6570\u7ec4\u65f6\u6307\u5b9a\u6570\u7ec4\u957f\u5ea6\nint[] array1 = new int[10];\nSystem.out.println(array1);\nint[] array2 = new int[10];\nSystem.out.println(array2);\n\n\/\/ \u9759\u6001\u521d\u59cb\u5316\uff0c\u521b\u5efa\u6570\u7ec4\u65f6\u76f4\u63a5\u4ee5\u6570\u636e\u957f\u5ea6\u4e3a\u51c6\nint[] array3 = new int[] {1, 2, 3, 4};\nSystem.out.println(array3);\nint[] array4 = {1, 2, 3, 4};\nSystem.out.println(array4);\n\n\/\/ \u521d\u59cb\u5316\u53ef\u4ee5\u5148\u5b9a\u4e49\u53d8\u91cf\u518d\u8d4b\u503c\uff0c\u4f46\u6709\u4e00\u79cd\u60c5\u51b5\u4f8b\u5916\nint[] array5;\narray5 = new int[10];\nint[] array6;\narray6 = new int[] {1, 2, 3, 4};\nint[] array7;\narray7 = {1, 2, 3, 4}; \/\/ \u6ce8\u610f\uff1a\u8fd9\u79cd\u60c5\u51b5\u662f\u975e\u6cd5\u7684\uff0c\u7f16\u8bd1\u62a5\u9519\n<\/code><\/pre>\n<\/li>\n<\/ul>\n
          2 \u76f8\u5173\u603b\u7ed3<\/h1>\n
          2.1 \u7c7b\u4e0e\u5bf9\u8c61<\/h2>\n
          <\/p>\n
          \n  \u5c40\u90e8\u53d8\u91cf\u4e0e\u6210\u5458\u53d8\u91cf\u7684\u533a\u522b\n<\/p><\/blockquote>\n
            \n
          1. \u5b9a\u4e49\u7684\u4f4d\u7f6e\u4e0d\u4e00\u6837\n
              \n
            • \u5c40\u90e8\u53d8\u91cf\uff1a\u5728\u65b9\u6cd5\u7684\u5185\u90e8<\/li>\n
            • \u6210\u5458\u53d8\u91cf\uff1a\u5728\u65b9\u6cd5\u7684\u5916\u90e8\uff0c\u76f4\u63a5\u5199\u5728\u7c7b\u4e2d<\/li>\n<\/ul>\n<\/li>\n
            • \u4f5c\u7528\u8303\u56f4\u4e0d\u4e00\u6837\n
                \n
              • \u5c40\u90e8\u53d8\u91cf\uff1a\u53ea\u6709\u5728\u5f53\u524d\u65b9\u6cd5\u4e2d\u624d\u53ef\u4ee5\u4f7f\u7528\uff0c\u51fa\u4e86\u65b9\u6cd5\u5219\u4e0d\u53ef\u7528<\/li>\n
              • \u6210\u5458\u53d8\u91cf\uff1a\u6574\u4e2a\u7c7b\u4e2d\u90fd\u53ef\u4ee5\u4f7f\u7528<\/li>\n<\/ul>\n<\/li>\n
              • \u9ed8\u8ba4\u503c\u4e0d\u4e00\u6837\n
                  \n
                • \u5c40\u90e8\u53d8\u91cf\uff1a\u6ca1\u6709\u9ed8\u8ba4\u503c\uff0c\u4f7f\u7528\u524d\u5fc5\u987b\u8d4b\u521d\u59cb\u503c<\/li>\n
                • \u6210\u5458\u53d8\u91cf\uff1a\u7f16\u8bd1\u5668\u4f1a\u81ea\u52a8\u8d4b\u9ed8\u8ba4\u503c<\/li>\n<\/ul>\n<\/li>\n
                • \u5185\u5b58\u4f4d\u7f6e\u4e0d\u4e00\u6837\n
                    \n
                  • \u5c40\u90e8\u53d8\u91cf\uff1a\u4f4d\u4e8e\u6808\u5185\u5b58<\/li>\n
                  • \u6210\u5458\u53d8\u91cf\uff1a\u4f4d\u4e8e\u5806\u5185\u5b58<\/li>\n<\/ul>\n<\/li>\n
                  • \u751f\u547d\u5468\u671f\u4e0d\u4e00\u6837\n
                      \n
                    • \u5c40\u90e8\u53d8\u91cf\uff1a\u968f\u7740\u65b9\u6cd5\u8fdb\u6808\u800c\u751f\uff0c\u968f\u7740\u65b9\u6cd5\u51fa\u6808\u800c\u4ea1<\/li>\n
                    • \u6210\u5458\u53d8\u91cf\uff1a\u968f\u7740\u5bf9\u8c61\u7684\u521b\u5efa\u800c\u8bde\u751f\uff0c\u968f\u7740\u5bf9\u8c61\u88ab\u5783\u573e\u56de\u6536\u800c\u6d88\u5931<\/li>\n<\/ul>\n<\/li>\n<\/ol>\n
                      2.2 \u5b57\u7b26\u4e32<\/h2>\n
                      \u521b\u5efa\u5b57\u7b26\u4e32\u5e38\u7528\u7684\uff14\u79cd\u65b9\u6cd5\uff083\u79cd\u6784\u9020\u51fd\u6570\u65b9\u6cd5+1\u79cd\u5b57\u9762\u91cf\u76f4\u63a5\u521b\u5efa\uff09<\/strong><\/p>\n
                        \n
                      1. \u6784\u9020\u51fd\u6570String()<\/code>\n
                        String str = new String();   \/\/ \n<\/code><\/pre>\n<\/li>\n
                      2. \u6784\u9020\u51fd\u6570String(char[] charArray)<\/code>\n
                        char[] charArray = {'A', 'B', 'C'};\nString str = new String(charArray);  \/\/ ABC\n<\/code><\/pre>\n<\/li>\n
                      3. \u6784\u9020\u51fd\u6570String(byte[] byteArray)<\/code>\n
                        byte[] byteArray = {97, 98, 99};\nString str = new String(byteArray); \/\/ abc\n<\/code><\/pre>\n<\/li>\n
                      4. \u5b57\u9762\u91cf\n
                        String str = \"string\";   \/\/ string\n<\/code><\/pre>\n<\/li>\n<\/ol>\n
                        \u5b57\u7b26\u4e32\u5728\u5185\u5b58\u7684\u8868\u73b0\u5f62\u5f0f<\/strong><\/p>\n
                          \n
                        1. \u4e0d\u7ba1\u901a\u8fc7\u4ec0\u4e48\u65b9\u5f0f\u521b\u5efa\u7684\u5b57\u7b26\u4e32\uff0c\u6240\u6709\u7684\u5b57\u7b26\u4e32\u90fd\u662f\u5bf9\u8c61\uff1b<\/li>\n
                        2. \u901a\u8fc7\u5b57\u9762\u91cf\u7684\u5f62\u5f0f\u521b\u5efa\u7684\u5b57\u7b26\u4e32\uff0c\u6307\u5411\u7684\u5806\u7a7a\u95f4\u7684\u4e00\u4e2a\u5b57\u7b26\u4e32\u5e38\u91cf\u6c60(\u5171\u7528\u5b57\u7b26\u4e32\u5bf9\u8c61)\uff1b<\/li>\n
                        3. \u901a\u8fc7\u5bf9\u8c61\u901a\u8fc7\u5b57\u7b26\u4e32\u7684\u6784\u9020\u65b9\u6cd5\u521b\u5efa\u7684\u5b57\u7b26\u4e32\uff0c\u5148\u8f6c\u6362\u6210char\u6570\u7ec4\uff0c\u518d\u5728\u5806\u4e2d\u751f\u6210\u5bf9\u8c61\u6307\u5b9a\u8fd9\u4e2a\u6570\u7ec4\uff1b<\/li>\n<\/ol>\n
                          public class StringDemo {\n    public static void main(String[] args) {\n        String str1 = \"abc\";\n        String str2 = \"abc\";\n        char[] charArray = {'a', 'b', 'c'};\n        String str3 = new String(charArray);\n        \/**\n         * \u5f15\u7528\u7c7b\u578b\u901a\u8fc7\u201c==\u201d\u6bd4\u8f83\u7684\u662f\u5730\u5740\n         * \u901a\u8fc7\u5b57\u9762\u91cf\u76f4\u63a5\u521b\u5efa\u7684\u5b57\u7b26\u4e32\uff0c\u6307\u5411\u7684\u662f\u5806\u4e2d\u7684\u201c\u5b57\u7b26\u4e32\u5e38\u91cf\u6c60\u201d\n         * \u901a\u8fc7char\u6570\u7ec4\u521b\u5efa\u7684\u5b57\u7b26\u4e32\uff0c\u5728\u5806\u4e2d\u6307\u5411char\u6570\u7ec4\u8f6c\u6362\u540e\u7684\u53e6\u4e00\u7247\u5730\u5740\u7a7a\u95f4str->\u58061->\u58062\n         *\/\n        System.out.println(str1 == str2);   \/\/ true\n        System.out.println(str2 == str3);   \/\/ false\n        System.out.println(str3 == str1);   \/\/ false\n    }\n}\n<\/code><\/pre>\n
                          2.3 \u63a5\u53e3\u7684\u57fa\u672c\u4f7f\u7528<\/h2>\n
                          \u62bd\u8c61\u65b9\u6cd5\u7684\u5b9a\u4e49<\/strong> public abstract \u8fd4\u56de\u7c7b\u578b \u65b9\u6cd5\u540d(\u53c2\u6570\u5217\u8868);<\/code> \u5b9e\u73b0\u7c7b\u4e2d\u5fc5\u987b\u5b9e\u73b0\u63a5\u53e3\u4e2d\u7684\u6240\u6709\u62bd\u8c61\u65b9\u6cd5\uff0c\u9664\u975e\u662f\u62bd\u8c61\u7c7b\u3002<\/p>\n
                          public abstract void abstractMethod1();\n\npublic abstract void abstractMethod2();\n\npublic abstract void abstractMethod3();\n\npublic abstract void abstractMethod4();\n<\/code><\/pre>\n
                          \u9ed8\u8ba4\u65b9\u6cd5\u7684\u5b9a\u4e49<\/strong> public default \u8fd4\u56de\u503c\u7c7b\u578b \u65b9\u6cd5\u540d(\u53c2\u6570\u5217\u8868){}<\/code> \u63a5\u53e3\u7684\u5b9e\u73b0\u7c7b\u4e2d\u53ef\u4ee5\u9009\u62e9\u6027\u5730\u5b9e\u73b0\u8be5\u65b9\u6cd5\uff0cSDK8.0<\/strong>\u53ca\u4ee5\u4e0a\u652f\u6301\u3002<\/p>\n
                          \/**\n * \u9ed8\u8ba4\u65b9\u6cd5(\u89e3\u51b3\u5347\u7ea7\u7684\u95ee\u9898)\n * \u8be5\u65b9\u6cd5\u5b9e\u73b0\u7c7b\u4e2d\u53ef\u4ee5\u88ab\u91cd\u5199\uff0c\u4e5f\u53ef\u4ee5\u7701\u7565\uff0c\u56e0\u4e3a\u8fd9\u91cc\u6709\u5b9e\u73b0\u4f53\n *\/\npublic default void defaultMethod() {\n    System.out.println(\"\u63a5\u53e3\u7c7b\u7684\u9ed8\u8ba4\u65b9\u6cd5...\");\n}\n<\/code><\/pre>\n
                          \u9759\u6001\u65b9\u6cd5<\/strong> public static \u8fd4\u56de\u7c7b\u578b \u65b9\u6cd5\u540d(\u53c2\u6570\u5217\u8868){}<\/code>  \u8be5\u7279\u6027\u4eceSDK8.0<\/strong>\u53ca\u4ee5\u540e\u624d\u652f\u6301<\/p>\n
                          public static void show() {\n    System.out.println(\"MyInterfaceAbstract static method..\");\n}\n<\/code><\/pre>\n
                          \u79c1\u6709\u65b9\u6cd5\u7684\u5b9a\u4e49<\/strong> privat \u8fd4\u56de\u503c\u7c7b\u578b \u65b9\u6cd5\u540d(\u53c2\u6570\u5217\u8868){}<\/code>\uff0c\u8fd9\u79cd\u65b9\u6cd5\u7684\u5b9a\u4e49\u5728SDK9.0<\/strong>\u53ca\u4ee5\u540e\u7684\u7248\u672c\u624d\u652f\u6301\uff0c\u89e3\u51b3\u9ed8\u8ba4\u65b9\u6cd5\u4e2d\u529f\u80fd\u7684\u62bd\u8c61\uff0c\u5206\u4e3a\u666e\u901a\u65b9\u6cd5\u4e0e\u9759\u6001\u65b9\u6cd5\uff0c\u9759\u6001\u65b9\u6cd5\u53ea\u80fd\u901a\u8fc7\u63a5\u53e3\u540d\u8c03\u7528<\/strong>\u3002<\/p>\n
                          \/\/ \u666e\u901a\u79c1\u6709\u65b9\u6cd5\nprivate void commonMethod() {\n    System.out.println(\"common method...\");\n}\n\/\/ \u9759\u6001\u79c1\u6709\u65b9\u6cd5\nprivate static void staticMethod() {\n    \/\/ coding...\n}\n<\/code><\/pre>\n
                          \u9759\u6001\u5e38\u91cf<\/strong> public static final \u6570\u636e\u7c7b\u578b \u5e38\u91cf\u540d = \u503c<\/code> \u9700\u8981\u6ce8\u610f\u7684\u662f\uff1a\u5e38\u91cf\u547d\u540d\u4f7f\u7528\u5927\u5199\uff1bpublic static final \u53ef\u4ee5\u7701\u7565\u4f46\u6548\u679c\u4e00\u6837\u3002<\/p>\n
                          public static final int NAME_LENGTH = 10;\n<\/code><\/pre>\n
                          \u9700\u8981\u6ce8\u610f\u7684\u662f\uff1a<\/strong><\/p>\n
                            \n
                          • \u63a5\u53e3\u4e2d\u4e0d\u80fd\u6709\u9759\u6001\u4ee3\u7801\u5757static {}<\/code><\/li>\n
                          • \u63a5\u53e3\u5b9e\u73b0\u7c7b\u53ef\u4ee5\u540c\u65f6\u5b9e\u73b0\u591a\u4e2a\u63a5\u53e3 implements intA, intB<\/code><\/li>\n
                          • \u5982\u679c\u591a\u4e2a\u63a5\u53e3\u4e2d\u62bd\u8c61\u65b9\u6cd5\u91cd\u540d\uff0c\u53ea\u9700\u8981\u5b9e\u73b0\u4e00\u6b21\u5373\u53ef\uff0c\u5982\u679c\u662f\u9ed8\u8ba4\u65b9\u6cd5\u5219\u5fc5\u987b\u91cd\u5199<\/li>\n
                          • \u5982\u679c\u6ca1\u6709\u5b9e\u73b0\u63a5\u53e3\u7684\u6240\u6709\u65b9\u6cd5\uff0c\u53ea\u80fd\u662f\u62bd\u8c61\u7c7b<\/li>\n
                          • \u5982\u679c\u7ee7\u627f\u7684\u65b9\u6cd5\u4e0e\u63a5\u53e3\u7684\u65b9\u6cd5\u51b2\u7a81\uff0c\u5219\u7ee7\u627f\u7684\u65b9\u6cd5\u4f18\u5148\u7ea7\u8f83\u9ad8<\/li>\n
                          • \u7c7b\u53ea\u80fd\u5355\u7ee7\u627f\uff0c\u4f46\u63a5\u53e3\u53ef\u4ee5\u591a\u7ee7\u627f<\/strong>\u3002<\/li>\n<\/ul>\n
                            2.4 \u5305\u88c5\u7c7b\u7684\u4f7f\u7528<\/h2>\n
                            int<\/code>\u3001Integer<\/code>\u3001String<\/code> \u4e4b\u95f4\u7684\u76f8\u4e92\u8f6c\u6362<\/strong>\uff0c\u5176\u5b83\u57fa\u672c\u6570\u636e\u7c7b\u578b\u4ee5\u6b64\u7c7b\u63a8<\/p>\n
                            \/\/ int --> Integer\n\/\/ Integer i = new Integer(1);\nInteger a = Integer.valueOf(1);\nInteger a1 = 1;\n\n\/\/ Integer --> int\nint b = a.intValue();\nint b1 = a;\n\n\/\/ String --> Integer\nInteger c = Integer.valueOf(\"1\");\n\n\/\/ String --> int\nint d = Integer.parseInt(\"1\");\n\n\/\/ Integer --> String\nString e = c.toString();\n\n\/\/ int --> String\nString f = String.valueOf(1);\n<\/code><\/pre>\n","protected":false},"excerpt":{"rendered":"
                            1 \u9700\u8981\u6ce8\u610f\u7684\u70b9 1.1 \u8fd0\u7b97\u8d4b\u503c\u64cd\u4f5c \u590d\u5408\u8d4b\u503c\u8fd0\u7b97\u4e2d(\u5982\uff1a+=\u3001-=\u7b49)\uff0c\u9690\u542b\u4e86\u7c7b\u578b\u5f3a\u5236\u8f6c\u6362\u3002\u5982\uff1a byte b = 126; \/\/ \u6309\u5e38\u74062\u662fint\u578b\uff0cbyte + int \u7ed3\u679c\u5e94\u8be5\u662fint\uff0c\u4f46\u8fd9\u91cc\u4f1a\u5f3a\u8f6c\u4e3abyte b += 2; \/\/ \u7ed3\u679c\u4f1a\u6ea2\u51fa System.out.println(b); \/\/ -128 \u4e09\u76ee\u8fd0\u7b97\u4e0d\u80fd\u5355\u72ec\u5b58\u5728\uff0c\u8fd0\u7b97\u7ed3\u679c\u5fc5\u987b\u8981\u6709\u201c\u63a5\u6536\u65b9\u201d OperationDemo.java:10: \u9519\u8bef: \u4e0d\u662f\u8bed\u53e5 a > b ? a : b; ^ 1 \u4e2a\u9519\u8bef \u6574\u6570\u7c7b\u578b\u4e2dbyte\u3001short\u3001int\u3001long\u56db\u79cd\u7684\u524d\u4e09\u79cd\u5728\u8fd0\u7b97\u65f6\u90fd\u4f1a\u5148\u8f6c\u6362\u4e3aint\u7c7b\u578b\uff1b byte a = 10; byte b = 20; \/\/ \u4e8b\u5b9e\u4e0a\u662fbyte = int + int\uff0c\u6240\u4ee5\u7f16\u8bd1\u65f6\u4f1a\u62a5\u9519 byte ret = a […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[35],"tags":[34,91,246],"class_list":["post-1561","post","type-post","status-publish","format-standard","hentry","category-java","tag-java","tag-91","tag-246"],"_links":{"self":[{"href":"https:\/\/www.yusian.com\/blog\/wp-json\/wp\/v2\/posts\/1561","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.yusian.com\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.yusian.com\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.yusian.com\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.yusian.com\/blog\/wp-json\/wp\/v2\/comments?post=1561"}],"version-history":[{"count":0,"href":"https:\/\/www.yusian.com\/blog\/wp-json\/wp\/v2\/posts\/1561\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.yusian.com\/blog\/wp-json\/wp\/v2\/media?parent=1561"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.yusian.com\/blog\/wp-json\/wp\/v2\/categories?post=1561"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.yusian.com\/blog\/wp-json\/wp\/v2\/tags?post=1561"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}