{"id":65642,"date":"2026-01-25T14:08:31","date_gmt":"2026-01-25T06:08:31","guid":{"rendered":"https:\/\/www.wsisp.com\/helps\/65642.html"},"modified":"2026-01-25T14:08:31","modified_gmt":"2026-01-25T06:08:31","slug":"02%e3%80%81java-%e5%9f%ba%e7%a1%80%e7%a1%ac%e6%a0%b8%e5%a4%8d%e4%b9%a0%ef%bc%9a%e5%8f%98%e9%87%8f%e4%b8%8e%e8%bf%90%e7%ae%97%e7%ac%a6%e7%9a%84%e9%81%bf%e5%9d%91%e6%8c%87%e5%8d%97","status":"publish","type":"post","link":"https:\/\/www.wsisp.com\/helps\/65642.html","title":{"rendered":"02\u3001Java \u57fa\u7840\u786c\u6838\u590d\u4e60\uff1a\u53d8\u91cf\u4e0e\u8fd0\u7b97\u7b26\u7684\u201c\u907f\u5751\u201d\u6307\u5357"},"content":{"rendered":"

02\u3001Java \u57fa\u7840\u786c\u6838\u590d\u4e60：\u53d8\u91cf\u4e0e\u8fd0\u7b97\u7b26\u7684\u201c\u907f\u5751\u201d\u6307\u5357<\/h2>\n

\u7b2c\u4e00\u90e8\u5206：\u6838\u5fc3\u57fa\u7840\u77e5\u8bc6\u4f53\u7cfb<\/h3>\n

1. Java \u7684 8 \u5927\u57fa\u672c\u6570\u636e\u7c7b\u578b<\/h4>\n

Java \u662f\u5f3a\u7c7b\u578b\u8bed\u8a00，\u7262\u8bb0\u8fd9 8 \u79cd\u7c7b\u578b\u53ca\u5176\u5360\u7528\u7684\u5185\u5b58\u7a7a\u95f4\u662f\u57fa\u672c\u529f：<\/p>\n\n\u5206\u7c7b\u7c7b\u578b\u5b57\u8282\u9ed8\u8ba4\u503c\u6ce8\u610f\u70b9<\/tr>\n\n\n\n\n\n\n\n\n\n
\u6574\u578b<\/td>\nbyte<\/td>\n1<\/td>\n0<\/td>\n\u53c2\u4e0e\u8fd0\u7b97\u65f6\u4f1a\u81ea\u52a8\u63d0\u5347\u4e3a int<\/td>\n<\/tr>\n
<\/td>\nshort<\/td>\n2<\/td>\n0<\/td>\n\u540c\u4e0a<\/td>\n<\/tr>\n
<\/td>\nint<\/td>\n4<\/td>\n0<\/td>\n\u6574\u6570\u9ed8\u8ba4\u7c7b\u578b<\/td>\n<\/tr>\n
<\/td>\nlong<\/td>\n8<\/td>\n0L<\/td>\n\u5b9a\u4e49\u65f6\u5fc5\u987b\u52a0\u540e\u7f00 L (\u5982 100L)<\/td>\n<\/tr>\n
\u6d6e\u70b9\u578b<\/td>\nfloat<\/td>\n4<\/td>\n0.0f<\/td>\n\u5b9a\u4e49\u65f6\u5fc5\u987b\u52a0\u540e\u7f00 F (\u5982 3.14F)<\/td>\n<\/tr>\n
<\/td>\ndouble<\/td>\n8<\/td>\n0.0d<\/td>\n\u5c0f\u6570\u9ed8\u8ba4\u7c7b\u578b，\u7cbe\u5ea6\u6bd4 float \u9ad8<\/td>\n<\/tr>\n
\u5b57\u7b26\u578b<\/td>\nchar<\/td>\n2<\/td>\n\u2018\\\\u0000\u2019<\/td>\n\u91c7\u7528 Unicode \u7f16\u7801，\u53ef\u4ee5\u5b58\u4e00\u4e2a\u6c49\u5b57<\/td>\n<\/tr>\n
\u5e03\u5c14\u578b<\/td>\nboolean<\/td>\n1\u4f4d*<\/td>\nfalse<\/td>\n\u53ea\u6709 true \u548c false<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

\u6ce8：boolean \u5728\u5185\u5b58\u4e2d\u7684\u5927\u5c0f\u5e76\u672a\u660e\u786e\u5b9a\u4e49，\u4f9d\u8d56\u4e8e JVM \u5b9e\u73b0，\u901a\u5e38\u5355\u72ec\u4f7f\u7528\u65f6\u5360 4 \u5b57\u8282（\u5f53\u4f5c int \u5904\u7406），\u6570\u7ec4\u65f6\u5360 1 \u5b57\u8282\u3002<\/p>\n

2. \u7c7b\u578b\u8f6c\u6362\u89c4\u5219<\/h4>\n
    \n
  • \u81ea\u52a8\u63d0\u5347（\u9690\u5f0f\u8f6c\u6362）：\u5c0f\u8303\u56f4—–>\u5927\u8303\u56f4\u3002\n
      \n
    • \u89c4\u5219：byte\u3001short\u3001char \u5728\u53c2\u4e0e\u8fd0\u7b97\u65f6，\u4f1a\u76f4\u63a5\u63d0\u5347\u4e3a int\u3002<\/li>\n<\/ul>\n<\/li>\n
    • \u5f3a\u5236\u8f6c\u6362（\u663e\u5f0f\u8f6c\u6362）：\u5927\u8303\u56f4 —-> \u5c0f\u8303\u56f4\u3002\n
        \n
      • \u683c\u5f0f：(\u7c7b\u578b) \u53d8\u91cf\u540d\u3002<\/li>\n
      • \u98ce\u9669：\u53ef\u80fd\u4f1a\u5bfc\u81f4\u7cbe\u5ea6\u4e22\u5931\u6216\u6570\u636e\u6ea2\u51fa\u3002<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n
        \n

        \u7b2c\u4e8c\u90e8\u5206：\u8fd0\u7b97\u7b26\u7684\u9ad8\u6548\u4e0e\u903b\u8f91<\/h3>\n

        1. \u903b\u8f91\u8fd0\u7b97\u7b26：&& vs &<\/h4>\n
          \n
        • & (\u903b\u8f91\u4e0e)：\u4e24\u8fb9\u90fd\u4f1a\u6267\u884c\u3002<\/li>\n
        • && (\u77ed\u8def\u4e0e)：\u63a8\u8350\u4f7f\u7528\u3002\u5982\u679c\u5de6\u8fb9\u4e3a false，\u53f3\u8fb9\u4e0d\u518d\u6267\u884c，\u6548\u7387\u66f4\u9ad8，\u4e14\u80fd\u907f\u514d\u7a7a\u6307\u9488\u5f02\u5e38\u3002<\/li>\n
        • \u540c\u7406，|| (\u77ed\u8def\u6216) \u6bd4 | \u66f4\u5e38\u7528\u3002<\/li>\n<\/ul>\n

          2. \u4f4d\u8fd0\u7b97\u7b26：\u8ba1\u7b97\u673a\u7684\u201c\u539f\u751f\u8bed\u8a00\u201d<\/h4>\n

          \u4f4d\u8fd0\u7b97\u76f4\u63a5\u64cd\u4f5c\u4e8c\u8fdb\u5236\u4f4d，\u6548\u7387\u6781\u9ad8\u3002<\/p>\n

            \n
          • \u5de6\u79fb <<：\u76f8\u5f53\u4e8e\u4e58\u4ee5 2\u3002\u4f8b\u5982 2 << 3 \u7b49\u4e8e \n

            2<\/p>\n

            \u00d7<\/p>\n

            2<\/p>\n

            3<\/p>\n

            =<\/p>\n

            16<\/p>\n

            2 \\\\times 2^3 = 16<\/p>\n

            <\/span><\/span>2<\/span><\/span>\u00d7<\/span><\/span><\/span><\/span>2<\/span><\/span>3<\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span>=<\/span><\/span><\/span><\/span>16<\/span><\/span><\/span><\/span><\/span>\u3002\u8fd9\u662f\u8ba1\u7b97 2 * 8 \u6700\u5feb\u7684\u65b9\u5f0f\u3002<\/li>\n

          • \u53f3\u79fb >>：\u5e26\u7b26\u53f7\u53f3\u79fb（\u6b63\u88650，\u8d1f\u88651）\u3002\u76f8\u5f53\u4e8e\u9664\u4ee5 2\u3002<\/li>\n
          • \u65e0\u7b26\u53f7\u53f3\u79fb >>>：\u65e0\u8bba\u6b63\u8d1f，\u9ad8\u4f4d\u5168\u90e8\u8865 0\u3002\u5e38\u7528\u4e8e\u54c8\u5e0c\u7b97\u6cd5\u3002<\/li>\n
          • \u5f02\u6216 ^：\u76f8\u540c\u4e3a 0，\u4e0d\u540c\u4e3a 1\u3002\u6280\u5de7：\u53ef\u4ee5\u7528\u4e8e\u4e0d\u5f15\u5165\u7b2c\u4e09\u4e2a\u53d8\u91cf\u4ea4\u6362\u4e24\u4e2a\u6574\u6570\u7684\u503c\u3002<\/li>\n<\/ul>\n
            \n

            \u7b2c\u4e09\u90e8\u5206：\u9ad8\u9891\u9762\u8bd5\u201c\u9677\u9631\u201d (Deep Dive)<\/h3>\n

            \u8fd9\u90e8\u5206\u662f\u672c\u6587\u7684\u7cbe\u534e，\u4e13\u95e8\u89e3\u51b3\u90a3\u4e9b\u201c\u770b\u7740\u5bf9，\u8fd0\u884c\u9519\u201d\u7684\u4ee3\u7801\u3002<\/p>\n

            \u9677\u9631 1：i = i++ \u7684\u8be1\u5f02\u7ed3\u679c<\/h4>\n

            int<\/span> i =<\/span> 1<\/span>;<\/span>
            \ni =<\/span> i++<\/span>;<\/span>
            \nSystem<\/span>.<\/span>out.<\/span>println<\/span>(<\/span>i)<\/span>;<\/span> \/\/ \u7ed3\u679c\u662f 1，\u4e0d\u662f 2！<\/span><\/p>\n

            \u539f\u7406： JVM \u5728\u5904\u7406 i++ \u65f6，\u4f1a\u5148\u5c06 i \u7684\u5f53\u524d\u503c（1）\u538b\u5165\u64cd\u4f5c\u6570\u6808\u4f5c\u4e3a\u201c\u4e34\u65f6\u66ff\u8eab\u201d，\u7136\u540e i \u53d8\u91cf\u81ea\u589e\u53d8\u4e3a 2\u3002\u4f46\u6700\u540e\u4e00\u6b65\u8d4b\u503c\u64cd\u4f5c，\u662f\u5c06**\u64cd\u4f5c\u6570\u6808\u91cc\u7684\u66ff\u8eab（1）**\u91cd\u65b0\u8d4b\u7ed9\u4e86 i，\u5bfc\u81f4\u81ea\u589e\u65e0\u6548\u3002<\/p>\n

            \u9677\u9631 2：short \u7c7b\u578b\u7684\u8fd0\u7b97<\/h4>\n

            short<\/span> s =<\/span> 1<\/span>;<\/span>
            \ns =<\/span> s +<\/span> 1<\/span>;<\/span> \/\/ \u274c \u7f16\u8bd1\u62a5\u9519！1\u662fint，\u8fd0\u7b97\u7ed3\u679c\u662fint，\u4e0d\u80fd\u76f4\u63a5\u7ed9short<\/span>
            \ns +=<\/span> 1<\/span>;<\/span> \/\/ \u2705 \u6b63\u786e！<\/span><\/p>\n

            \u539f\u7406： \u6269\u5c55\u8d4b\u503c\u8fd0\u7b97\u7b26（+=, -=, *= \u7b49）\u5185\u90e8\u9690\u542b\u4e86\u5f3a\u5236\u7c7b\u578b\u8f6c\u6362\u3002s += 1 \u7b49\u4ef7\u4e8e s = (short)(s + 1)\u3002<\/p>\n

            \u9677\u9631 3：\u6d6e\u70b9\u6570\u7684\u201c\u859b\u5b9a\u8c14\u201d\u7cbe\u5ea6<\/h4>\n

            double<\/span> d =<\/span> 0.1<\/span> +<\/span> 0.2<\/span>;<\/span>
            \nSystem<\/span>.<\/span>out.<\/span>println<\/span>(<\/span>d ==<\/span> 0.3<\/span>)<\/span>;<\/span> \/\/ false<\/span>
            \n\/\/ \u8f93\u51fa：0.30000000000000004<\/span><\/p>\n

            \u539f\u7406： \u8ba1\u7b97\u673a\u7528\u4e8c\u8fdb\u5236\u5b58\u5c0f\u6570，\u65e0\u6cd5\u7cbe\u786e\u8868\u793a 0.1\u3002 \u89e3\u51b3\u65b9\u6848： \u5728\u91d1\u878d\u3001\u7535\u5546\u6d89\u53ca\u91d1\u989d\u8ba1\u7b97\u65f6，\u7981\u6b62\u4f7f\u7528 float\/double，\u5fc5\u987b\u4f7f\u7528 BigDecimal \u7c7b，\u4e14\u5fc5\u987b\u4f7f\u7528\u5b57\u7b26\u4e32\u6784\u9020\u5668 new BigDecimal("0.1")\u3002<\/p>\n

            \u9677\u9631 4：String \u62fc\u63a5\u7684\u987a\u5e8f<\/h4>\n

            System<\/span>.<\/span>out.<\/span>println<\/span>(<\/span>1<\/span> +<\/span> 2<\/span> +<\/span> "abc"<\/span>)<\/span>;<\/span> \/\/ \u8f93\u51fa "3abc"<\/span>
            \nSystem<\/span>.<\/span>out.<\/span>println<\/span>(<\/span>"abc"<\/span> +<\/span> 1<\/span> +<\/span> 2<\/span>)<\/span>;<\/span> \/\/ \u8f93\u51fa "abc12"<\/span><\/p>\n

            \u539f\u7406： \u8fd0\u7b97\u7b26\u4ece\u5de6\u5230\u53f3\u6267\u884c\u3002\u7b2c\u4e00\u884c\u5148\u505a\u52a0\u6cd5\u518d\u62fc\u63a5；\u7b2c\u4e8c\u884c\u4e00\u5f00\u59cb\u9047\u5230 String，+ \u5c31\u53d8\u6210\u4e86\u8fde\u63a5\u7b26，\u540e\u9762\u7684\u6570\u5b57\u901a\u901a\u88ab\u5f53\u6210\u5b57\u7b26\u4e32\u62fc\u63a5\u3002<\/p>\n

            \u9677\u9631 5：\u53d8\u91cf\u521d\u59cb\u5316<\/h4>\n

            public<\/span> void<\/span> test<\/span>(<\/span>)<\/span> {<\/span>
            \n int<\/span> a;<\/span>
            \n System<\/span>.<\/span>out.<\/span>println<\/span>(<\/span>a)<\/span>;<\/span> \/\/ \u274c \u7f16\u8bd1\u62a5\u9519<\/span>
            \n}<\/span><\/p>\n

            \u539f\u7406：<\/p>\n

            \u5c40\u90e8\u53d8\u91cf（\u65b9\u6cd5\u5185\u90e8）\u6ca1\u6709\u9ed8\u8ba4\u503c，\u5fc5\u987b\u624b\u52a8\u521d\u59cb\u5316\u624d\u80fd\u4f7f\u7528\u3002\u53ea\u6709\u6210\u5458\u53d8\u91cf（\u7c7b\u91cc）\u624d\u6709\u9ed8\u8ba4\u503c（\u5982 int \u4e3a 0）\u3002<\/p>\n

            \u603b\u7ed3<\/h3>\n

            \u53d8\u91cf\u4e0e\u8fd0\u7b97\u7b26\u662f Java \u7f16\u7a0b\u7684\u57fa\u77f3，\u770b\u4f3c\u7b80\u5355，\u5b9e\u5219\u6697\u85cf\u7384\u673a\u3002\u638c\u63e1\u8fd9\u4e9b\u7ec6\u8282，\u4e0d\u4ec5\u80fd\u8ba9\u4f60\u5728\u9762\u8bd5\u4e2d\u8131\u9896\u800c\u51fa，\u66f4\u80fd\u907f\u514d\u5728\u5b9e\u9645\u5f00\u53d1\u4e2d\u5199\u51fa\u9690\u85cf\u7684 Bug\u3002\u57fa\u7840\u4e0d\u7262，\u5730\u52a8\u5c71\u6447\u3002\u5e0c\u671b\u8fd9\u7bc7\u201c\u907f\u5751\u6307\u5357\u201d\u80fd\u52a9\u4f60\u4e00\u81c2\u4e4b\u529b！<\/p>\n","protected":false},"excerpt":{"rendered":"

            02\u3001Java \u57fa\u7840\u786c\u6838\u590d\u4e60：\u53d8\u91cf\u4e0e\u8fd0\u7b97\u7b26\u7684\u201c\u907f\u5751\u201d\u6307\u5357
            \n\u7b2c\u4e00\u90e8\u5206：\u6838\u5fc3\u57fa\u7840\u77e5\u8bc6\u4f53\u7cfb
            \n1. Java \u7684 8 \u5927\u57fa\u672c\u6570\u636e\u7c7b\u578b
            \nJava \u662f\u5f3a\u7c7b\u578b\u8bed\u8a00，\u7262\u8bb0\u8fd9 8 \u79cd\u7c7b\u578b\u53ca\u5176\u5360\u7528\u7684\u5185\u5b58\u7a7a\u95f4\u662f\u57fa\u672c\u529f：
            \n\u5206\u7c7b\u7c7b\u578b\u5b57\u8282\u9ed8\u8ba4\u503c\u6ce8\u610f\u70b9\u6574\u578bbyte10\u53c2\u4e0e\u8fd0\u7b97\u65f6\u4f1a\u81ea\u52a8\u63d0\u5347\u4e3a intshort20\u540c\u4e0aint40\u6574\u6570\u9ed8\u8ba4\u7c7b\u578blong80L\u5b9a\u4e49\u65f6\u5fc5\u987b\u52a0\u540e\u7f00 L (\u5982 100L)\u6d6e\u70b9\u578bfloat40.0f\u5b9a\u4e49\u65f6\u5fc5\u987b\u52a0\u540e\u7f00 F (\u5982 3<\/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":[99,81,190],"topic":[],"class_list":["post-65642","post","type-post","status-publish","format-standard","hentry","category-server","tag-java","tag-python","tag-190"],"yoast_head":"\n02\u3001Java \u57fa\u7840\u786c\u6838\u590d\u4e60\uff1a\u53d8\u91cf\u4e0e\u8fd0\u7b97\u7b26\u7684\u201c\u907f\u5751\u201d\u6307\u5357 - \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\/65642.html\" \/>\n<meta property=\"og:locale\" content=\"zh_CN\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"02\u3001Java \u57fa\u7840\u786c\u6838\u590d\u4e60\uff1a\u53d8\u91cf\u4e0e\u8fd0\u7b97\u7b26\u7684\u201c\u907f\u5751\u201d\u6307\u5357 - \u7f51\u7855\u4e92\u8054\u5e2e\u52a9\u4e2d\u5fc3\" \/>\n<meta property=\"og:description\" content=\"02\u3001Java \u57fa\u7840\u786c\u6838\u590d\u4e60：\u53d8\u91cf\u4e0e\u8fd0\u7b97\u7b26\u7684\u201c\u907f\u5751\u201d\u6307\u5357 \u7b2c\u4e00\u90e8\u5206：\u6838\u5fc3\u57fa\u7840\u77e5\u8bc6\u4f53\u7cfb 1. 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