{"id":202587,"date":"2025-05-22T09:40:23","date_gmt":"2025-05-22T01:40:23","guid":{"rendered":"https:\/\/server.hk\/cnblog\/202587\/"},"modified":"2025-05-22T09:40:23","modified_gmt":"2025-05-22T01:40:23","slug":"%e5%9c%a8%e9%ab%98%e6%80%a7%e8%83%bd-java-%e5%ba%94%e7%94%a8%e7%a8%8b%e5%ba%8f%e4%b8%ad%e5%ba%94%e7%94%a8%e5%87%bd%e6%95%b0%e5%bc%8f%e7%bc%96%e7%a8%8b","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/202587\/","title":{"rendered":"\u5728\u9ad8\u6027\u80fd Java \u5e94\u7528\u7a0b\u5e8f\u4e2d\u5e94\u7528\u51fd\u6570\u5f0f\u7f16\u7a0b"},"content":{"rendered":"

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

\u5728\u9ad8\u6027\u80fd Java \u5e94\u7528\u7a0b\u5e8f\u4e2d\u5e94\u7528\u51fd\u6570\u5f0f\u7f16\u7a0b<\/h1>\n

\u6b22\u8fce\u5404\u4f4d\u5c0f\u4f19\u4f34\u6765\u5230\uff0c\u76f8\u805a\u4e8e\u6b64\u90fd\u662f\u7f18\u54c8\u54c8\u54c8\uff01\u4eca\u5929\u6211\u7ed9\u5927\u5bb6\u5e26\u6765\u300a\u5728\u9ad8\u6027\u80fd Java \u5e94\u7528\u7a0b\u5e8f\u4e2d\u5e94\u7528\u51fd\u6570\u5f0f\u7f16\u7a0b\u300b<\/span>\uff0c\u8fd9\u7bc7\u6587\u7ae0\u4e3b\u8981\u8bb2\u5230<\/span>\u7b49\u7b49\u77e5\u8bc6\uff0c\u5982\u679c\u4f60\u5bf9\u6587\u7ae0<\/span>\u76f8\u5173\u7684\u77e5\u8bc6\u975e\u5e38\u611f\u5174\u8da3\u6216\u8005\u6b63\u5728\u81ea\u5b66\uff0c\u90fd\u53ef\u4ee5\u5173\u6ce8\u6211\uff0c\u6211\u4f1a\u6301\u7eed\u66f4\u65b0\u76f8\u5173\u6587\u7ae0\uff01\u5f53\u7136\uff0c\u6709\u4ec0\u4e48\u5efa\u8bae\u4e5f\u6b22\u8fce\u5728\u8bc4\u8bba\u7559\u8a00\u63d0\u51fa\uff01\u4e00\u8d77\u5b66\u4e60\uff01<\/p>\n

\u5728\u9ad8\u6027\u80fd Java \u5e94\u7528\u7a0b\u5e8f\u4e2d\u5e94\u7528\u51fd\u6570\u5f0f\u7f16\u7a0b\u53ef\u4ee5\u663e\u8457\u63d0\u9ad8\u6027\u80fd\u548c\u53ef\u7ef4\u62a4\u6027\uff0c\u5177\u4f53\u65b9\u6cd5\u5982\u4e0b\uff1a\u4f7f\u7528\u4e0d\u53ef\u53d8\u6570\u636e\uff0c\u901a\u8fc7\u4f7f\u7528\u6700\u7ec8\u5b57\u6bb5\u6216\u4e0d\u53ef\u53d8\u6570\u636e\u7ed3\u6784\u6765\u9632\u6b62\u6570\u636e\u66f4\u6539\u3002\u4f7f\u7528\u7eaf\u51fd\u6570\uff0c\u5373\u59cb\u7ec8\u4ea7\u751f\u76f8\u540c\u8f93\u51fa\u4e14\u6ca1\u6709\u526f\u4f5c\u7528\u7684\u51fd\u6570\u3002\u501f\u52a9 Java 8 \u51fd\u6570\u5f0f\u7f16\u7a0b API\uff0c\u5229\u7528 lambda \u8868\u8fbe\u5f0f\u3001\u6d41\u548c\u51fd\u6570\u5f0f\u63a5\u53e3\u4ee5\u7b80\u6d01\u4e14\u58f0\u660e\u6027\u7684\u65b9\u5f0f\u7f16\u5199\u4ee3\u7801\u3002<\/p>\n

<\/p>\n

\u5728\u9ad8\u6027\u80fd Java \u5e94\u7528\u7a0b\u5e8f\u4e2d\u5e94\u7528\u51fd\u6570\u5f0f\u7f16\u7a0b<\/strong><\/p>\n

\u51fd\u6570\u5f0f\u7f16\u7a0b\u662f\u4e00\u79cd\u7f16\u7a0b\u8303\u4f8b\uff0c\u5b83\u5f3a\u8c03\u4f7f\u7528\u4e0d\u53ef\u53d8\u6570\u636e\u548c\u7eaf\u51fd\u6570\uff0c\u8fd9\u53ef\u4ee5\u663e\u8457\u63d0\u9ad8\u4ee3\u7801\u7684\u6027\u80fd\u548c\u53ef\u7ef4\u62a4\u6027\u3002\u5728 Java \u4e2d\uff0c\u51fd\u6570\u5f0f\u7f16\u7a0b\u6280\u672f\u5df2\u88ab\u5e7f\u6cdb\u5e94\u7528\uff0c\u4ee5\u4f18\u5316\u9ad8\u6027\u80fd\u5e94\u7528\u7a0b\u5e8f\u3002<\/p>\n

\u4e0d\u53ef\u53d8\u6570\u636e<\/strong><\/p>\n

\u4e0d\u53ef\u53d8\u6570\u636e\u662f\u6307\u5728\u521b\u5efa\u540e\u65e0\u6cd5\u66f4\u6539\u5176\u503c\u7684\u6570\u636e\u3002\u8fd9\u53ef\u4ee5\u901a\u8fc7\u4f7f\u7528\u6700\u7ec8\u5b57\u6bb5\u6216\u4f7f\u7528\u4e0d\u53ef\u53d8\u6570\u636e\u7ed3\u6784\uff08\u4f8b\u5982\u4e0d\u53ef\u53d8\u5217\u8868\u548c\u6620\u5c04\uff09\u6765\u5b9e\u73b0\u3002<\/p>\n

final int i = 10; \/\/ \u4e0d\u53ef\u53d8\u7684\u6574\u578b\u5b57\u6bb5\nfinal List<String> names = List.of(\"Alice\", \"Bob\", \"Carol\"); \/\/ \u4e0d\u53ef\u53d8\u5217\u8868<\/pre>\n
\u7eaf\u51fd\u6570<\/strong><\/p>\n
\u7eaf\u51fd\u6570\u662f\u6307\u7531\u7ed9\u5b9a\u7684\u8f93\u5165\u59cb\u7ec8\u4ea7\u751f\u76f8\u540c\u8f93\u51fa\u7684\u51fd\u6570\uff0c\u5e76\u4e14\u4e0d\u5177\u6709\u526f\u4f5c\u7528\u3002\u8fd9\u901a\u8fc7\u907f\u514d\u4f7f\u7528\u5168\u5c40\u53d8\u91cf\u6216\u5bf9\u53ef\u53d8\u6570\u636e\u8fdb\u884c\u5199\u64cd\u4f5c\u6765\u5b9e\u73b0\u3002<\/p>\n
int add(int a, int b) {\n    return a + b; \/\/ \u7eaf\u51fd\u6570\uff0c\u65e0\u526f\u4f5c\u7528\n}<\/pre>\n
Java 8 \u51fd\u6570\u5f0f\u7f16\u7a0b API<\/strong><\/p>\n
Java 8 \u5f15\u5165\u4e86\u51fd\u6570\u5f0f\u7f16\u7a0b API\uff0c\u5305\u62ec lambda \u8868\u8fbe\u5f0f\u3001\u6d41\u548c\u51fd\u6570\u5f0f\u63a5\u53e3\u3002\u8fd9\u4e9b API \u5141\u8bb8\u5f00\u53d1\u4eba\u5458\u4ee5\u66f4\u52a0\u7b80\u6d01\u548c\u58f0\u660e\u6027\u7684\u65b9\u5f0f\u7f16\u5199\u51fd\u6570\u5f0f\u4ee3\u7801\u3002<\/p>\n
\u793a\u4f8b\uff1a\u4f7f\u7528\u51fd\u6570\u5f0f\u7f16\u7a0b\u4f18\u5316\u5b57\u7b26\u4e32\u5904\u7406<\/strong><\/p>\n
\u8003\u8651\u4ee5\u4e0b\u4f20\u7edf\u7684\u5b57\u7b26\u4e32\u5904\u7406\u4ee3\u7801\uff1a<\/p>\n
String result = \"\";\nfor (String name : names) {\n    result += name + \", \";\n}<\/pre>\n
\u6211\u4eec\u53ef\u4ee5\u4f7f\u7528 Java 8 \u7684\u6d41 API \u5c06\u6b64\u4ee3\u7801\u91cd\u6784\u4e3a\u66f4\u7b80\u6d01\u4e14\u53ef\u80fd\u66f4\u9ad8\u6548\u7684\u51fd\u6570\u5f0f\u7248\u672c\uff1a<\/p>\n
String result = names.stream()\n    .reduce((a, b) -> a + b + \", \")\n    .get();<\/pre>\n
\u5b9e\u6218\u6848\u4f8b\uff1a\u4f7f\u7528\u51fd\u6570\u5f0f\u7f16\u7a0b\u4f18\u5316\u591a\u7ebf\u7a0b\u4efb\u52a1<\/strong><\/p>\n
\u5728\u591a\u7ebf\u7a0b\u73af\u5883\u4e2d\uff0c\u51fd\u6570\u5f0f\u7f16\u7a0b\u53ef\u4ee5\u5e2e\u52a9\u51cf\u5c11\u540c\u6b65\u5f00\u9500\u5e76\u63d0\u9ad8\u4ee3\u7801\u53ef\u8bfb\u6027\u3002\u8003\u8651\u4ee5\u4e0b\u793a\u4f8b\uff0c\u5176\u4e2d\u4f7f\u7528\u4f20\u7edf\u7684\u9501\u6765\u4fdd\u62a4\u5171\u4eab\u6570\u636e\uff1a<\/p>\n
private final Object lock = new Object();\npublic void add(int value) {\n    synchronized(lock) {\n        count += value;\n    }\n}<\/pre>\n
\u6211\u4eec\u53ef\u4ee5\u4f7f\u7528 Java 8 \u7684 AtomicInteger \u6765\u5b9e\u73b0\u76f8\u540c\u7684\u4efb\u52a1\uff0c\u8be5\u4efb\u52a1\u63d0\u4f9b\u4e86\u975e\u963b\u585e\u7684\u7ebf\u7a0b\u5b89\u5168\u8ba1\u6570\u5668\uff1a<\/p>\n
private final AtomicInteger count = new AtomicInteger();\npublic void add(int value) {\n    count.addAndGet(value);\n}<\/pre>\n
 conclusion<\/strong><\/p>\n
\u51fd\u6570\u5f0f\u7f16\u7a0b\u5728\u9ad8\u6027\u80fd Java \u5e94\u7528\u7a0b\u5e8f\u4e2d\u626e\u6f14\u7740\u81f3\u5173\u91cd\u8981\u7684\u89d2\u8272\u3002\u901a\u8fc7\u5229\u7528\u4e0d\u53ef\u53d8\u6570\u636e\u548c\u7eaf\u51fd\u6570\uff0c\u5f00\u53d1\u4eba\u5458\u53ef\u4ee5\u7f16\u5199\u6027\u80fd\u66f4\u9ad8\u3001\u53ef\u7ef4\u62a4\u6027\u66f4\u597d\u7684\u4ee3\u7801\u3002Java 8 \u7684\u51fd\u6570\u5f0f\u7f16\u7a0b API \u63d0\u4f9b\u4e86\u4e00\u7cfb\u5217\u5f3a\u5927\u7684\u5de5\u5177\uff0c\u53ef\u4ee5\u8f7b\u677e\u5c06\u51fd\u6570\u5f0f\u7f16\u7a0b\u6280\u672f\u96c6\u6210\u5230 Java \u5e94\u7528\u7a0b\u5e8f\u4e2d\u3002<\/p>\n
\u4eca\u5929\u5173\u4e8e\u300a\u5728\u9ad8\u6027\u80fd Java \u5e94\u7528\u7a0b\u5e8f\u4e2d\u5e94\u7528\u51fd\u6570\u5f0f\u7f16\u7a0b\u300b\u7684\u5185\u5bb9\u5c31\u4ecb\u7ecd\u5230\u8fd9\u91cc\u4e86\uff0c\u662f\u4e0d\u662f\u5b66\u8d77\u6765\u4e00\u76ee\u4e86\u7136\uff01\u60f3\u8981\u4e86\u89e3\u66f4\u591a\u5173\u4e8ejava,\u51fd\u6570\u5f0f\u7f16\u7a0b\u7684\u5185\u5bb9\u8bf7\u5173\u6ce8\u516c\u4f17\u53f7\uff01<\/p>\n","protected":false},"excerpt":{"rendered":"
\u5728\u9ad8\u6027\u80fd Java \u5e94\u7528\u7a0b\u5e8f\u4e2d\u5e94...<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[4925],"tags":[],"class_list":["post-202587","post","type-post","status-publish","format-standard","hentry","category-4925"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/202587","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/comments?post=202587"}],"version-history":[{"count":0,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/202587\/revisions"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=202587"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=202587"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=202587"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}