{"id":46819,"date":"2024-12-02T10:10:48","date_gmt":"2024-12-02T02:10:48","guid":{"rendered":"https:\/\/fwq.ai\/blog\/46819\/"},"modified":"2024-12-02T10:10:48","modified_gmt":"2024-12-02T02:10:48","slug":"java-%e5%87%bd%e6%95%b0%e5%86%85%e5%ad%98%e4%bc%98%e5%8c%96%e7%9a%84%e6%9c%80%e4%bd%b3%e5%ae%9e%e8%b7%b5","status":"publish","type":"post","link":"https:\/\/fwq.ai\/blog\/46819\/","title":{"rendered":"Java \u51fd\u6570\u5185\u5b58\u4f18\u5316\u7684\u6700\u4f73\u5b9e\u8df5"},"content":{"rendered":"

<\/b> <\/p>\n

Java \u51fd\u6570\u5185\u5b58\u4f18\u5316\u7684\u6700\u4f73\u5b9e\u8df5<\/h1>\n

\u7c73\u4e91\u4eca\u5929\u5c06\u7ed9\u5927\u5bb6\u5e26\u6765\u300aJava \u51fd\u6570\u5185\u5b58\u4f18\u5316\u7684\u6700\u4f73\u5b9e\u8df5\u300b<\/span>\uff0c\u611f\u5174\u8da3\u7684\u670b\u53cb\u8bf7\u7ee7\u7eed\u770b\u4e0b\u53bb\u5427\uff01\u4ee5\u4e0b\u5185\u5bb9\u5c06\u4f1a\u6d89\u53ca\u5230<\/span>\u7b49\u7b49\u77e5\u8bc6\u70b9\uff0c\u5982\u679c\u4f60\u662f\u6b63\u5728\u5b66\u4e60\u6587\u7ae0<\/span>\u6216\u8005\u5df2\u7ecf\u662f\u5927\u4f6c\u7ea7\u522b\u4e86\uff0c\u90fd\u975e\u5e38\u6b22\u8fce\u4e5f\u5e0c\u671b\u5927\u5bb6\u90fd\u80fd\u7ed9\u6211\u5efa\u8bae\u8bc4\u8bba\u54c8~\u5e0c\u671b\u80fd\u5e2e\u52a9\u5230\u5927\u5bb6\uff01<\/p>\n

\u5982\u4f55\u4f18\u5316 Java \u51fd\u6570\u5185\u5b58\u4f7f\u7528\uff1f\u4f7f\u7528\u539f\u59cb\u7c7b\u578b\u4ee5\u8282\u7701\u5185\u5b58\u3002\u907f\u514d\u5bf9\u8c61\u521b\u5efa\u4ee5\u51cf\u5c11\u5185\u5b58\u5f00\u9500\u3002\u4f7f\u7528 final \u5173\u952e\u8bcd\u9632\u6b62\u91cd\u65b0\u5206\u914d\uff0c\u63d0\u9ad8\u6027\u80fd\u3002\u4f18\u5316\u5faa\u73af\u4ee5\u907f\u514d\u4e34\u65f6\u53d8\u91cf\u5e76\u9884\u5206\u914d\u6570\u636e\u5b58\u50a8\u3002\u91ca\u653e\u672a\u4f7f\u7528\u7684\u8d44\u6e90\u4ee5\u91ca\u653e\u5185\u5b58\u3002\u4f7f\u7528\u5f15\u7528\u8ba1\u6570\u7ba1\u7406\u4ee5\u5c06\u5bf9\u8c61\u6807\u8bb0\u4e3a\u53ef\u968f\u65f6\u5783\u573e\u56de\u6536\u3002<\/p>\n

\"Java<\/p>\n

Java \u51fd\u6570\u5185\u5b58\u4f18\u5316\u7684\u6700\u4f73\u5b9e\u8df5<\/strong><\/p>\n

\u5728\u5927\u578b Java \u5e94\u7528\u7a0b\u5e8f\u4e2d\uff0c\u5185\u5b58\u7ba1\u7406\u5bf9\u4e8e\u786e\u4fdd\u6700\u4f73\u6027\u80fd\u548c\u907f\u514d\u5185\u5b58\u6cc4\u6f0f\u81f3\u5173\u91cd\u8981\u3002\u4ee5\u4e0b\u662f\u4e00\u4e9b\u6700\u4f73\u5b9e\u8df5\uff0c\u53ef\u5e2e\u52a9\u60a8\u4f18\u5316 Java \u51fd\u6570\u7684\u5185\u5b58\u4f7f\u7528\uff1a<\/p>\n

\u4f7f\u7528\u539f\u59cb\u7c7b\u578b<\/strong><\/p>\n

\u539f\u59cb\u6570\u636e\u7c7b\u578b\uff08\u5982 int\u3001long \u548c double\uff09\u6bd4\u5b83\u4eec\u7684\u5305\u88c5\u5668\u7c7b\uff08\u5982 Integer\u3001Long \u548c Double\uff09\u66f4\u8282\u7701\u5185\u5b58\u3002\u5728\u4e0d\u5f71\u54cd\u4ee3\u7801\u53ef\u8bfb\u6027\u548c\u53ef\u7ef4\u62a4\u6027\u7684\u60c5\u51b5\u4e0b\uff0c\u8bf7\u4f18\u5148\u4f7f\u7528\u5b83\u4eec\u3002<\/p>\n

\u907f\u514d\u5bf9\u8c61\u521b\u5efa<\/strong><\/p>\n

\u5c3d\u53ef\u80fd\u907f\u514d\u521b\u5efa\u5bf9\u8c61\u3002\u5728\u5faa\u73af\u6216\u65b9\u6cd5\u4e2d\u91cd\u590d\u521b\u5efa\u5bf9\u8c61\u4f1a\u4ea7\u751f\u5927\u91cf\u5185\u5b58\u5f00\u9500\u3002\u76f8\u53cd\uff0c\u53ef\u4ee5\u8003\u8651\u4f7f\u7528\u6c60\u6216\u5bf9\u8c61\u7f13\u5b58\u6765\u91cd\u7528\u5bf9\u8c61\u3002<\/p>\n

\u4f7f\u7528 final<\/code> \u5173\u952e\u8bcd<\/strong><\/p>\n

\u5c06\u53d8\u91cf\u58f0\u660e\u4e3a final<\/code> \u53ef\u4ee5\u9632\u6b62\u91cd\u65b0\u5206\u914d\uff0c\u4ece\u800c\u8282\u7701\u5185\u5b58\u5e76\u63d0\u9ad8\u6027\u80fd\u3002\u53ea\u6709\u5f53\u786e\u5b9a\u53d8\u91cf\u5728\u51fd\u6570\u6267\u884c\u8fc7\u7a0b\u4e2d\u4e0d\u4f1a\u66f4\u6539\u65f6\u624d\u4f7f\u7528 final<\/code>\u3002<\/p>\n

\u4f18\u5316\u5faa\u73af<\/strong><\/p>\n

\u5faa\u73af\u662f Java \u5e94\u7528\u7a0b\u5e8f\u4e2d\u5e38\u89c1\u7684\u6f5c\u5728\u5185\u5b58\u6cc4\u6f0f\u6765\u6e90\u3002\u907f\u514d\u5728\u5faa\u73af\u4e2d\u4f7f\u7528\u4e34\u65f6\u53d8\u91cf\uff0c\u56e0\u4e3a\u8fd9\u4f1a\u5728\u6bcf\u6b21\u8fed\u4ee3\u65f6\u521b\u5efa\u65b0\u5bf9\u8c61\u3002\u76f8\u53cd\uff0c\u8003\u8651\u9884\u5206\u914d\u6570\u7ec4\u6216\u96c6\u5408\u4ee5\u5b58\u50a8\u4e2d\u95f4\u6570\u636e\u3002<\/p>\n

\u91ca\u653e\u672a\u4f7f\u7528\u7684\u8d44\u6e90<\/strong><\/p>\n

\u5728\u4e0d\u518d\u9700\u8981\u5b83\u4eec\u65f6\u91ca\u653e\u5185\u5b58\u8d44\u6e90\u975e\u5e38\u91cd\u8981\u3002\u5728 Java \u4e2d\uff0c\u53ef\u4ee5\u4f7f\u7528 AutoCloseable<\/code> \u63a5\u53e3\u548c try-with-resources<\/code> \u8bed\u53e5\u6765\u7ba1\u7406\u6587\u4ef6\u3001\u6d41\u548c\u5176\u4ed6\u8d44\u6e90\u3002\u901a\u8fc7\u8fd9\u6837\u505a\uff0cJava \u865a\u62df\u673a (JVM) \u5728\u8bed\u53e5\u5757\u7ed3\u675f\u65f6\u4f1a\u81ea\u52a8\u5173\u95ed\u8d44\u6e90\u5e76\u91ca\u653e\u5185\u5b58\u3002<\/p>\n

\u4f7f\u7528\u5f15\u7528\u8ba1\u6570\u7ba1\u7406<\/strong><\/p>\n

Java 8 \u5f15\u5165\u4e86 java.lang.ref<\/code> \u5305\uff0c\u63d0\u4f9b\u5bf9\u5f15\u7528\u8ba1\u6570\u7684\u4f4e\u7ea7\u8bbf\u95ee\u3002\u901a\u8fc7\u4f7f\u7528\u5f31\u5f15\u7528\u6216\u8f6f\u5f15\u7528\uff0c\u53ef\u4ee5\u5c06\u5bf9\u8c61\u89c6\u4e3a\u53ef\u968f\u65f6\u5783\u573e\u56de\u6536\uff0c\u5373\u4f7f\u5b83\u4eec\u4ecd\u88ab\u5176\u4ed6\u5bf9\u8c61\u5f15\u7528\u4e5f\u5982\u6b64\u3002<\/p>\n

\u5b9e\u6218\u6848\u4f8b<\/strong><\/p>\n

\u8003\u8651\u4e00\u4e2a\u51fd\u6570\uff0c\u5b83\u8ba1\u7b97\u7ed9\u5b9a\u5b57\u7b26\u4e32\u5217\u8868\u4e2d\u7684\u5b57\u7b26\u603b\u6570\u3002\u4ee5\u4e0b\u662f\u91c7\u7528\u4e00\u4e9b\u6700\u4f73\u5b9e\u8df5\u540e\u7684\u4f18\u5316\u7248\u672c\uff1a<\/p>\n

public static int countCharsOptimized(List<String> strings) {\n    \/\/ \u4f7f\u7528\u539f\u59cb\u7c7b\u578b\uff0c\u907f\u514d\u88c5\u7bb1\/\u62c6\u7bb1\n    int count = 0;\n    \n    \/\/ \u4f7f\u7528\u9ad8\u6548\u7684\u6d41\u5f0f\u5904\u7406\u907f\u514d\u4e2d\u95f4\u53d8\u91cf\n    for (String s : strings) {\n        count += s.length();\n    }\n    \n    return count;\n}<\/pre>\n
\u901a\u8fc7\u5e94\u7528\u8fd9\u4e9b\u6280\u672f\uff0c\u60a8\u53ef\u4ee5\u663e\u8457\u964d\u4f4e Java \u51fd\u6570\u7684\u5185\u5b58\u5f00\u9500\uff0c\u5e76\u786e\u4fdd\u5e94\u7528\u7a0b\u5e8f\u7684\u5e73\u7a33\u8fd0\u884c\u548c\u6700\u4f73\u6027\u80fd\u3002<\/p>\n
\u7406\u8bba\u8981\u638c\u63e1\uff0c\u5b9e\u64cd\u4e0d\u80fd\u843d\uff01\u4ee5\u4e0a\u5173\u4e8e\u300aJava \u51fd\u6570\u5185\u5b58\u4f18\u5316\u7684\u6700\u4f73\u5b9e\u8df5\u300b\u7684\u8be6\u7ec6\u4ecb\u7ecd\uff0c\u5927\u5bb6\u90fd\u638c\u63e1\u4e86\u5427\uff01\u5982\u679c\u60f3\u8981\u7ee7\u7eed\u63d0\u5347\u81ea\u5df1\u7684\u80fd\u529b\uff0c\u90a3\u4e48\u5c31\u6765\u5173\u6ce8\u7c73\u4e91\u516c\u4f17\u53f7\u5427\uff01<\/p>\n","protected":false},"excerpt":{"rendered":"
Java \u51fd\u6570\u5185\u5b58\u4f18\u5316\u7684\u6700\u4f73\u5b9e\u8df5 \u7c73\u4e91\u4eca\u5929\u5c06\u7ed9\u5927\u5bb6\u5e26\u6765\u300aJava \u51fd\u6570\u5185\u5b58\u4f18\u5316\u7684\u6700\u4f73\u5b9e\u8df5\u300b\uff0c\u611f\u5174\u8da3\u7684\u670b\u53cb\u8bf7\u7ee7\u7eed\u770b\u4e0b\u53bb\u5427\uff01\u4ee5\u4e0b\u5185\u5bb9\u5c06\u4f1a\u6d89\u53ca\u5230\u7b49\u7b49\u77e5\u8bc6\u70b9\uff0c\u5982\u679c\u4f60\u662f\u6b63\u5728\u5b66\u4e60\u6587\u7ae0\u6216\u8005\u5df2\u7ecf\u662f\u5927\u4f6c\u7ea7\u522b\u4e86\uff0c\u90fd\u975e\u5e38\u6b22\u8fce\u4e5f\u5e0c\u671b\u5927\u5bb6\u90fd\u80fd\u7ed9\u6211\u5efa\u8bae\u8bc4\u8bba\u54c8~\u5e0c\u671b\u80fd\u5e2e\u52a9\u5230\u5927\u5bb6\uff01 \u5982\u4f55\u4f18\u5316 Java \u51fd\u6570\u5185\u5b58\u4f7f\u7528\uff1f\u4f7f\u7528\u539f\u59cb\u7c7b\u578b\u4ee5\u8282\u7701\u5185\u5b58\u3002\u907f\u514d\u5bf9\u8c61\u521b\u5efa\u4ee5\u51cf\u5c11\u5185\u5b58\u5f00\u9500\u3002\u4f7f\u7528 final \u5173\u952e\u8bcd\u9632\u6b62\u91cd\u65b0\u5206\u914d\uff0c\u63d0\u9ad8\u6027\u80fd\u3002\u4f18\u5316\u5faa\u73af\u4ee5\u907f\u514d\u4e34\u65f6\u53d8\u91cf\u5e76\u9884\u5206\u914d\u6570\u636e\u5b58\u50a8\u3002\u91ca\u653e\u672a\u4f7f\u7528\u7684\u8d44\u6e90\u4ee5\u91ca\u653e\u5185\u5b58\u3002\u4f7f\u7528\u5f15\u7528\u8ba1\u6570\u7ba1\u7406\u4ee5\u5c06\u5bf9\u8c61\u6807\u8bb0\u4e3a\u53ef\u968f\u65f6\u5783\u573e\u56de\u6536\u3002 Java \u51fd\u6570\u5185\u5b58\u4f18\u5316\u7684\u6700\u4f73\u5b9e\u8df5 \u5728\u5927\u578b Java \u5e94\u7528\u7a0b\u5e8f\u4e2d\uff0c\u5185\u5b58\u7ba1\u7406\u5bf9\u4e8e\u786e\u4fdd\u6700\u4f73\u6027\u80fd\u548c\u907f\u514d\u5185\u5b58\u6cc4\u6f0f\u81f3\u5173\u91cd\u8981\u3002\u4ee5\u4e0b\u662f\u4e00\u4e9b\u6700\u4f73\u5b9e\u8df5\uff0c\u53ef\u5e2e\u52a9\u60a8\u4f18\u5316 Java \u51fd\u6570\u7684\u5185\u5b58\u4f7f\u7528\uff1a \u4f7f\u7528\u539f\u59cb\u7c7b\u578b \u539f\u59cb\u6570\u636e\u7c7b\u578b\uff08\u5982 int\u3001long \u548c double\uff09\u6bd4\u5b83\u4eec\u7684\u5305\u88c5\u5668\u7c7b\uff08\u5982 Integer\u3001Long \u548c Double\uff09\u66f4\u8282\u7701\u5185\u5b58\u3002\u5728\u4e0d\u5f71\u54cd\u4ee3\u7801\u53ef\u8bfb\u6027\u548c\u53ef\u7ef4\u62a4\u6027\u7684\u60c5\u51b5\u4e0b\uff0c\u8bf7\u4f18\u5148\u4f7f\u7528\u5b83\u4eec\u3002 \u907f\u514d\u5bf9\u8c61\u521b\u5efa \u5c3d\u53ef\u80fd\u907f\u514d\u521b\u5efa\u5bf9\u8c61\u3002\u5728\u5faa\u73af\u6216\u65b9\u6cd5\u4e2d\u91cd\u590d\u521b\u5efa\u5bf9\u8c61\u4f1a\u4ea7\u751f\u5927\u91cf\u5185\u5b58\u5f00\u9500\u3002\u76f8\u53cd\uff0c\u53ef\u4ee5\u8003\u8651\u4f7f\u7528\u6c60\u6216\u5bf9\u8c61\u7f13\u5b58\u6765\u91cd\u7528\u5bf9\u8c61\u3002 \u4f7f\u7528 final \u5173\u952e\u8bcd \u5c06\u53d8\u91cf\u58f0\u660e\u4e3a final \u53ef\u4ee5\u9632\u6b62\u91cd\u65b0\u5206\u914d\uff0c\u4ece\u800c\u8282\u7701\u5185\u5b58\u5e76\u63d0\u9ad8\u6027\u80fd\u3002\u53ea\u6709\u5f53\u786e\u5b9a\u53d8\u91cf\u5728\u51fd\u6570\u6267\u884c\u8fc7\u7a0b\u4e2d\u4e0d\u4f1a\u66f4\u6539\u65f6\u624d\u4f7f\u7528 final\u3002 \u4f18\u5316\u5faa\u73af \u5faa\u73af\u662f Java \u5e94\u7528\u7a0b\u5e8f\u4e2d\u5e38\u89c1\u7684\u6f5c\u5728\u5185\u5b58\u6cc4\u6f0f\u6765\u6e90\u3002\u907f\u514d\u5728\u5faa\u73af\u4e2d\u4f7f\u7528\u4e34\u65f6\u53d8\u91cf\uff0c\u56e0\u4e3a\u8fd9\u4f1a\u5728\u6bcf\u6b21\u8fed\u4ee3\u65f6\u521b\u5efa\u65b0\u5bf9\u8c61\u3002\u76f8\u53cd\uff0c\u8003\u8651\u9884\u5206\u914d\u6570\u7ec4\u6216\u96c6\u5408\u4ee5\u5b58\u50a8\u4e2d\u95f4\u6570\u636e\u3002 \u91ca\u653e\u672a\u4f7f\u7528\u7684\u8d44\u6e90 \u5728\u4e0d\u518d\u9700\u8981\u5b83\u4eec\u65f6\u91ca\u653e\u5185\u5b58\u8d44\u6e90\u975e\u5e38\u91cd\u8981\u3002\u5728 Java \u4e2d\uff0c\u53ef\u4ee5\u4f7f\u7528 AutoCloseable \u63a5\u53e3\u548c try-with-resources \u8bed\u53e5\u6765\u7ba1\u7406\u6587\u4ef6\u3001\u6d41\u548c\u5176\u4ed6\u8d44\u6e90\u3002\u901a\u8fc7\u8fd9\u6837\u505a\uff0cJava \u865a\u62df\u673a (JVM) \u5728\u8bed\u53e5\u5757\u7ed3\u675f\u65f6\u4f1a\u81ea\u52a8\u5173\u95ed\u8d44\u6e90\u5e76\u91ca\u653e\u5185\u5b58\u3002 \u4f7f\u7528\u5f15\u7528\u8ba1\u6570\u7ba1\u7406 Java 8 \u5f15\u5165\u4e86 java.lang.ref \u5305\uff0c\u63d0\u4f9b\u5bf9\u5f15\u7528\u8ba1\u6570\u7684\u4f4e\u7ea7\u8bbf\u95ee\u3002\u901a\u8fc7\u4f7f\u7528\u5f31\u5f15\u7528\u6216\u8f6f\u5f15\u7528\uff0c\u53ef\u4ee5\u5c06\u5bf9\u8c61\u89c6\u4e3a\u53ef\u968f\u65f6\u5783\u573e\u56de\u6536\uff0c\u5373\u4f7f\u5b83\u4eec\u4ecd\u88ab\u5176\u4ed6\u5bf9\u8c61\u5f15\u7528\u4e5f\u5982\u6b64\u3002 \u5b9e\u6218\u6848\u4f8b 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