{"id":202599,"date":"2025-05-22T09:32:33","date_gmt":"2025-05-22T01:32:33","guid":{"rendered":"https:\/\/server.hk\/cnblog\/202599\/"},"modified":"2025-05-22T09:32:33","modified_gmt":"2025-05-22T01:32:33","slug":"java%e5%87%bd%e6%95%b0%e5%bc%8f%e7%bc%96%e7%a8%8b%e5%b9%b6%e8%a1%8c%e6%9f%a5%e6%89%be%e6%93%8d%e4%bd%9c","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/202599\/","title":{"rendered":"Java\u51fd\u6570\u5f0f\u7f16\u7a0b\u5e76\u884c\u67e5\u627e\u64cd\u4f5c"},"content":{"rendered":"

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

Java\u51fd\u6570\u5f0f\u7f16\u7a0b\u5e76\u884c\u67e5\u627e\u64cd\u4f5c<\/h1>\n

\u4eca\u65e5\u4e0d\u80af\u57cb\u5934\uff0c\u660e\u65e5\u4f55\u4ee5\u62ac\u5934\uff01\u6bcf\u65e5\u4e00\u53e5\u52aa\u529b\u81ea\u5df1\u7684\u8bdd\u54c8\u54c8~\u54c8\u55bd\uff0c\u4eca\u5929\u6211\u5c06\u7ed9\u5927\u5bb6\u5e26\u6765\u4e00\u7bc7\u300aJava\u51fd\u6570\u5f0f\u7f16\u7a0b\u5e76\u884c\u67e5\u627e\u64cd\u4f5c\u300b<\/span>\uff0c\u4e3b\u8981\u5185\u5bb9\u662f\u8bb2\u89e3<\/span>\u7b49\u7b49\uff0c\u611f\u5174\u8da3\u7684\u670b\u53cb\u53ef\u4ee5\u6536\u85cf\u6216\u8005\u6709\u66f4\u597d\u7684\u5efa\u8bae\u5728\u8bc4\u8bba\u63d0\u51fa\uff0c\u6211\u90fd\u4f1a\u8ba4\u771f\u770b\u7684\uff01\u5927\u5bb6\u4e00\u8d77\u8fdb\u6b65\uff0c\u4e00\u8d77\u5b66\u4e60\uff01<\/p>\n

<\/p>\n

Java \u51fd\u6570\u5f0f\u7f16\u7a0b\uff1a\u5e76\u884c\u67e5\u627e\u64cd\u4f5c<\/strong><\/p>\n

\u7b80\u4ecb<\/strong><\/p>\n

Java 8 \u63a8\u51fa\u4e86 Java Stream API\uff0c\u5b83\u63d0\u4f9b\u4e86\u4e00\u7ec4\u5f3a\u5927\u4e14\u7075\u6d3b\u7684\u65b9\u6cd5\uff0c\u7528\u4e8e\u5bf9\u96c6\u5408\u8fdb\u884c\u5e76\u884c\u5904\u7406\u3002\u5176\u4e2d\u4e00\u4e2a\u6709\u7528\u7684\u65b9\u6cd5\u662f findAny<\/code>\uff0c\u5b83\u5e76\u884c\u641c\u7d22\u96c6\u5408\u4e2d\u7684\u4efb\u4f55\u5143\u7d20\u5e76\u5c06\u5176\u8fd4\u56de\u3002<\/p>\n

\u5e76\u884c findAny<\/code> \u64cd\u4f5c<\/strong><\/p>\n

findAny<\/code> \u65b9\u6cd5\u8fd4\u56de\u4e00\u4e2a Optional<\/code> \u5bf9\u8c61\uff0c\u5b83\u8868\u793a\u627e\u5230\u7684\u5143\u7d20\u6216\u7a7a\u503c\u3002\u5982\u679c\u5728\u96c6\u5408\u4e2d\u627e\u5230\u4efb\u4f55\u5143\u7d20\uff0cfindAny<\/code> \u5c31\u4f1a\u7acb\u5373\u505c\u6b62\u641c\u7d22\u5e76\u8fd4\u56de\u7b2c\u4e00\u4e2a\u5143\u7d20\u3002\u8be5\u65b9\u6cd5\u4f7f\u7528 Fork\/Join \u6846\u67b6\uff0c\u5b83\u5c06\u4efb\u52a1\u62c6\u5206\u4e3a\u8f83\u5c0f\u7684\u5b50\u4efb\u52a1\uff0c\u4ee5\u4fbf\u5728\u591a\u4e2a\u7ebf\u7a0b\u4e0a\u5e76\u884c\u6267\u884c\u3002<\/p>\n

\u8981\u6267\u884c\u5e76\u884c findAny<\/code> \u64cd\u4f5c\uff0c\u53ef\u4ee5\u4f7f\u7528\u4ee5\u4e0b\u8bed\u6cd5\uff1a<\/p>\n

Optional<?> result = collection.parallelStream().findAny();<\/pre>\n
\u5176\u4e2d\uff0ccollection<\/code> \u662f\u8981\u641c\u7d22\u7684\u96c6\u5408\u3002<\/p>\n
\u5b9e\u6218\u6848\u4f8b<\/strong><\/p>\n
\u5047\u8bbe\u6211\u4eec\u6709\u4e00\u4e2a\u5b57\u7b26\u4e32\u5217\u8868\uff0c\u6211\u4eec\u9700\u8981\u5bfb\u627e\u4ee5\u5b57\u6bcd “A” \u5f00\u5934\u7684\u4efb\u4f55\u5b57\u7b26\u4e32\uff1a<\/p>\n
List<String> names = Arrays.asList(\"Alice\", \"Bob\", \"Charlie\", \"Dave\");\n\nOptional<String> result = names.parallelStream()\n        .filter(s -> s.startsWith(\"A\"))\n        .findAny();\n\nif (result.isPresent()) {\n    System.out.println(\"Found name starting with 'A': \" + result.get());\n} else {\n    System.out.println(\"No name starting with 'A' found\");\n}<\/pre>\n
\u8f93\u51fa\uff1a<\/p>\n
Found name starting with 'A': Alice<\/pre>\n
\u4f18\u70b9<\/strong><\/p>\n
\u5e76\u884c findAny<\/code> \u64cd\u4f5c\u7684\u4f18\u70b9\u5305\u62ec\uff1a<\/p>\n
    \n
  • \u6027\u80fd\u63d0\u5347\uff1a<\/strong>\u5229\u7528\u591a\u7ebf\u7a0b\u5e76\u884c\u5316\u641c\u7d22\uff0c\u4ece\u800c\u63d0\u9ad8\u6027\u80fd\u3002<\/li>\n
  • \u53ef\u7528\u6027\uff1a<\/strong>\u5373\u4f7f\u5728\u5904\u7406\u5927\u578b\u96c6\u5408\u65f6\uff0c\u4e5f\u80fd\u5feb\u901f\u627e\u5230\u6240\u9700\u7684\u5143\u7d20\u3002<\/li>\n
  • \u7075\u6d3b\u6027\uff1a<\/strong>\u53ef\u4ee5\u4f7f\u7528 filter<\/code> \u548c\u5176\u4ed6\u4e2d\u95f4\u64cd\u4f5c\u5bf9\u641c\u7d22\u7ed3\u679c\u8fdb\u884c\u8fc7\u6ee4\u548c\u4fee\u6539\u3002<\/li>\n<\/ul>\n
    \u4ee5\u4e0a\u5c31\u662f\u300aJava\u51fd\u6570\u5f0f\u7f16\u7a0b\u5e76\u884c\u67e5\u627e\u64cd\u4f5c\u300b\u7684\u8be6\u7ec6\u5185\u5bb9\uff0c\u66f4\u591a\u5173\u4e8e\u51fd\u6570\u5f0f\u7f16\u7a0b,\u5e76\u884c\u7684\u8d44\u6599\u8bf7\u5173\u6ce8\u516c\u4f17\u53f7\uff01<\/p>\n","protected":false},"excerpt":{"rendered":"
    Java\u51fd\u6570\u5f0f\u7f16\u7a0b\u5e76\u884c\u67e5\u627e\u64cd\u4f5c ...<\/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-202599","post","type-post","status-publish","format-standard","hentry","category-4925"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/202599","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=202599"}],"version-history":[{"count":0,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/202599\/revisions"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=202599"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=202599"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=202599"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}