{"id":202849,"date":"2025-05-22T10:04:03","date_gmt":"2025-05-22T02:04:03","guid":{"rendered":"https:\/\/server.hk\/cnblog\/202849\/"},"modified":"2025-05-22T10:04:03","modified_gmt":"2025-05-22T02:04:03","slug":"java%e5%87%bd%e6%95%b0%e5%bc%8f%e7%bc%96%e7%a8%8b%e5%b9%b6%e8%a1%8c%e5%88%86%e5%8c%ba%e6%93%8d%e4%bd%9c","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/202849\/","title":{"rendered":"Java\u51fd\u6570\u5f0f\u7f16\u7a0b\u5e76\u884c\u5206\u533a\u64cd\u4f5c"},"content":{"rendered":"

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

Java\u51fd\u6570\u5f0f\u7f16\u7a0b\u5e76\u884c\u5206\u533a\u64cd\u4f5c<\/h1>\n

\u77e5\u8bc6\u70b9\u638c\u63e1\u4e86\uff0c\u8fd8\u9700\u8981\u4e0d\u65ad\u7ec3\u4e60\u624d\u80fd\u719f\u7ec3\u8fd0\u7528\u3002\u4e0b\u9762\u7ed9\u5927\u5bb6\u5e26\u6765\u4e00\u4e2a\u6587\u7ae0\u5f00\u53d1\u5b9e\u6218\uff0c\u624b\u628a\u624b\u6559\u5927\u5bb6\u5b66\u4e60\u300aJava\u51fd\u6570\u5f0f\u7f16\u7a0b\u5e76\u884c\u5206\u533a\u64cd\u4f5c\u300b\uff0c\u5728\u5b9e\u73b0\u529f\u80fd\u7684\u8fc7\u7a0b\u4e2d\u4e5f\u5e26\u5927\u5bb6\u91cd\u65b0\u6e29\u4e60\u76f8\u5173\u77e5\u8bc6\u70b9\uff0c\u6e29\u6545\u800c\u77e5\u65b0\uff0c\u56de\u5934\u770b\u770b\u8bf4\u4e0d\u5b9a\u53c8\u6709\u4e0d\u4e00\u6837\u7684\u611f\u609f\uff01<\/p>\n

<\/p>\n

Java \u51fd\u6570\u5f0f\u7f16\u7a0b\u5e76\u884c\u5206\u533a\u64cd\u4f5c<\/strong><\/p>\n

\u51fd\u6570\u5f0f\u7f16\u7a0b\u63d0\u4f9b\u4e86\u5206\u533a\u64cd\u4f5c\uff0c\u53ef\u4ee5\u5c06\u96c6\u5408\u5206\u6210\u7b26\u5408\u7279\u5b9a\u8c13\u8bcd\u7684\u5143\u7d20\u3002\u5728 Java \u4e2d\uff0c\u53ef\u4ee5\u4f7f\u7528 Collectors.partitioningBy()<\/code> \u65b9\u6cd5\u6267\u884c\u5e76\u884c\u5206\u533a\u3002<\/p>\n

\u8bed\u6cd5\uff1a<\/strong><\/p>\n

Map<Boolean, List<T>> partitioningBy(Predicate<? super T> predicate)<\/pre>\n
\u53c2\u6570\uff1a<\/strong><\/p>\n
    \n
  • predicate<\/code>\uff1a\u8fd4\u56de true<\/code> \u6216 false<\/code> \u7684\u8c13\u8bcd\uff0c\u7528\u4e8e\u5c06\u5143\u7d20\u5206\u4e3a\u4e0d\u540c\u7684\u7ec4\u3002<\/li>\n<\/ul>\n
    \u5b9e\u6218\u6848\u4f8b\uff1a<\/strong><\/p>\n
    \u5047\u8bbe\u6211\u4eec\u6709\u4e00\u4e2a\u6c34\u679c\u5217\u8868\uff0c\u9700\u8981\u6839\u636e\u5b83\u4eec\u7684\u989c\u8272\u5c06\u5176\u5206\u7ec4\u5230\u4e0d\u540c\u7684\u96c6\u5408\u4e2d\uff1a<\/p>\n
    List<String> fruits = Arrays.asList(\"\u82f9\u679c\", \"\u9999\u8549\", \"\u6a58\u5b50\", \"\u8461\u8404\", \"\u8292\u679c\");\n\n\/\/ \u6839\u636e\u6c34\u679c\u989c\u8272\u8fdb\u884c\u5206\u533a\nMap<Boolean, List<String>> partitionedFruits = \n    fruits.stream()\n          .collect(Collectors.partitioningBy(fruit -> fruit.equals(\"\u7eff\u8272\")));\n\n\/\/ \u6253\u5370\u5206\u533a\u7ed3\u679c\npartitionedFruits.forEach((isGreen, fruitsInColor) -> {\n    System.out.println(\"\u662f\u5426\u7eff\u8272\uff1a\" + isGreen);\n    System.out.println(\"\u6c34\u679c\uff1a\" + fruitsInColor);\n});<\/pre>\n
    \u4ee5\u4e0a\u4ee3\u7801\u5c06 fruits<\/code> \u5217\u8868\u4e2d\u7eff\u8272\u7684\u6c34\u679c\u4e0e\u5176\u4ed6\u989c\u8272\u7684\u6c34\u679c\u5206\u5f00\u3002\u8f93\u51fa\u7ed3\u679c\u5982\u4e0b\uff1a<\/p>\n
    \u662f\u5426\u7eff\u8272\uff1atrue\n\u6c34\u679c\uff1a[\u8461\u8404]\n\u662f\u5426\u7eff\u8272\uff1afalse\n\u6c34\u679c\uff1a[\u82f9\u679c, \u9999\u8549, \u6a58\u5b50, \u8292\u679c]<\/pre>\n
    \u9700\u8981\u6ce8\u610f\u7684\u662f\uff0c\u5e76\u884c\u5206\u533a\u64cd\u4f5c\u5229\u7528\u591a\u6838\u5904\u7406\u5668\u6765\u63d0\u9ad8\u5904\u7406\u901f\u5ea6\u3002\u5b83\u5c06\u96c6\u5408\u5206\u6210\u591a\u4e2a\u5757\uff0c\u5e76\u884c\u5904\u7406\u6bcf\u4e2a\u5757\uff0c\u6700\u540e\u5c06\u7ed3\u679c\u7ec4\u5408\u5728\u4e00\u8d77\u3002<\/p>\n
    \u597d\u4e86\uff0c\u672c\u6587\u5230\u6b64\u7ed3\u675f\uff0c\u5e26\u5927\u5bb6\u4e86\u89e3\u4e86\u300aJava\u51fd\u6570\u5f0f\u7f16\u7a0b\u5e76\u884c\u5206\u533a\u64cd\u4f5c\u300b\uff0c\u5e0c\u671b\u672c\u6587\u5bf9\u4f60\u6709\u6240\u5e2e\u52a9\uff01\u5173\u6ce8\u516c\u4f17\u53f7\uff0c\u7ed9\u5927\u5bb6\u5206\u4eab\u66f4\u591a\u6587\u7ae0\u77e5\u8bc6\uff01<\/p>\n","protected":false},"excerpt":{"rendered":"
    Java\u51fd\u6570\u5f0f\u7f16\u7a0b\u5e76\u884c\u5206\u533a\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-202849","post","type-post","status-publish","format-standard","hentry","category-4925"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/202849","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=202849"}],"version-history":[{"count":0,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/202849\/revisions"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=202849"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=202849"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=202849"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}