{"id":202636,"date":"2025-05-22T10:20:36","date_gmt":"2025-05-22T02:20:36","guid":{"rendered":"https:\/\/server.hk\/cnblog\/202636\/"},"modified":"2025-05-22T10:20:36","modified_gmt":"2025-05-22T02:20:36","slug":"java%e5%87%bd%e6%95%b0%e5%bc%8f%e6%8e%a5%e5%8f%a3%e7%9a%84-stream-api","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/202636\/","title":{"rendered":"Java\u51fd\u6570\u5f0f\u63a5\u53e3\u7684 Stream API"},"content":{"rendered":"<p><b><\/b>     <\/p>\n<h1>Java\u51fd\u6570\u5f0f\u63a5\u53e3\u7684 Stream API<\/h1>\n<p>\u672c\u7bc7\u6587\u7ae0\u7ed9\u5927\u5bb6\u5206\u4eab\u300aJava\u51fd\u6570\u5f0f\u63a5\u53e3\u7684 Stream API\u300b\uff0c\u8986\u76d6\u4e86\u6587\u7ae0\u7684\u5e38\u89c1\u57fa\u7840\u77e5\u8bc6\uff0c\u5176\u5b9e\u4e00\u4e2a\u8bed\u8a00\u7684\u5168\u90e8\u77e5\u8bc6\u70b9\u4e00\u7bc7\u6587\u7ae0\u662f\u4e0d\u53ef\u80fd\u8bf4\u5b8c\u7684\uff0c\u4f46\u5e0c\u671b\u901a\u8fc7\u8fd9\u4e9b\u95ee\u9898\uff0c\u8ba9\u8bfb\u8005\u5bf9\u81ea\u5df1\u7684\u638c\u63e1\u7a0b\u5ea6\u6709\u4e00\u5b9a\u7684\u8ba4\u8bc6(B \u6570)\uff0c\u4ece\u800c\u5f25\u8865\u81ea\u5df1\u7684\u4e0d\u8db3\uff0c\u66f4\u597d\u7684\u638c\u63e1\u5b83\u3002<\/p>\n<p>\u7b54\u6848\uff1aJava Stream API \u5141\u8bb8\u901a\u8fc7\u51fd\u6570\u5f0f\u63a5\u53e3\u4ee5\u58f0\u660e\u5f0f\u65b9\u5f0f\u5904\u7406\u6570\u636e\u96c6\u5408\u3002\u8be6\u7ec6\u63cf\u8ff0\uff1a\u51fd\u6570\u5f0f\u63a5\u53e3\u5177\u6709\u4e00\u4e2a\u62bd\u8c61\u65b9\u6cd5\uff0c\u7528\u4e8e Stream API \u4e2d\u7684\u64cd\u4f5c\u3002Stream API \u64cd\u4f5c\u5305\u62ec\u7b5b\u9009\u3001\u6620\u5c04\u3001\u5f52\u7ea6\u548c\u6536\u96c6\u5143\u7d20\u3002Stream API \u7684\u4f18\u70b9\u5305\u62ec\u7b80\u5316\u7684\u6570\u636e\u5904\u7406\u3001\u58f0\u660e\u5f0f\u7f16\u7a0b\u3001\u63d0\u9ad8\u6027\u80fd\u3001\u4ee3\u7801\u53ef\u91cd\u7528\u6027\u548c\u53ef\u8bfb\u6027\u3002<\/p>\n<p><img decoding=\"async\" src=\"https:\/\/www.17golang.com\/uploads\/20241026\/1729926164671c9414a50fa.jpg\" class=\"aligncenter\"><\/p>\n<p><strong>Java \u51fd\u6570\u5f0f\u63a5\u53e3\u7684 Stream API<\/strong><\/p>\n<p>Java \u7684 Stream API \u63d0\u4f9b\u4e86\u4e00\u4e2a\u5f3a\u5927\u7684\u5de5\u5177\u96c6\uff0c\u7528\u4e8e\u5904\u7406\u96c6\u5408\u4e2d\u7684\u6570\u636e\u5143\u7d20\u3002\u5b83\u57fa\u4e8e\u51fd\u6570\u5f0f\u63a5\u53e3\uff0c\u5141\u8bb8\u60a8\u4ee5\u58f0\u660e\u5f0f\u65b9\u5f0f\u5bf9\u6570\u636e\u6d41\u8fdb\u884c\u5404\u79cd\u64cd\u4f5c\u3002<\/p>\n<p><strong>\u51fd\u6570\u5f0f\u63a5\u53e3<\/strong><\/p>\n<p>\u51fd\u6570\u5f0f\u63a5\u53e3\u5177\u6709\u4e00\u4e2a\u4e14\u4ec5\u4e00\u4e2a\u62bd\u8c61\u65b9\u6cd5\u3002Stream API \u4f7f\u7528\u4e86\u8bb8\u591a\u4e0d\u540c\u7684\u51fd\u6570\u5f0f\u63a5\u53e3\uff0c\u5305\u62ec\uff1a<\/p>\n<ul>\n<li>Predicate\uff1a\u6d4b\u8bd5\u8c13\u8bcd<\/li>\n<li>Function\uff1a\u5c06\u4e00\u4e2a\u5143\u7d20\u6620\u5c04\u5230\u53e6\u4e00\u4e2a\u5143\u7d20<\/li>\n<li>Consumer\uff1a\u6d88\u8017\u5143\u7d20<\/li>\n<li>Supplier\uff1a\u751f\u6210\u5143\u7d20<\/li>\n<\/ul>\n<p><strong>Stream API<\/strong><\/p>\n<p>Stream API \u63d0\u4f9b\u4e86\u8bb8\u591a\u64cd\u4f5c\uff0c\u5305\u62ec\uff1a<\/p>\n<ul>\n<li>filter\uff1a\u6839\u636e\u8c13\u8bcd\u7b5b\u9009\u5143\u7d20<\/li>\n<li>map\uff1a\u5c06\u5143\u7d20\u6620\u5c04\u5230\u53e6\u4e00\u4e2a\u5143\u7d20<\/li>\n<li>reduce\uff1a\u5c06\u5143\u7d20\u5f52\u7ea6\u4e3a\u4e00\u4e2a\u503c<\/li>\n<li>collect\uff1a\u5c06\u5143\u7d20\u6536\u96c6\u5230\u96c6\u5408\u4e2d<\/li>\n<\/ul>\n<p><strong>\u5b9e\u6218\u6848\u4f8b\uff1a<\/strong><\/p>\n<p>\u8ba9\u6211\u4eec\u8003\u8651\u4ee5\u4e0b\u4ee3\u7801\uff0c\u4f7f\u7528 Stream API \u8fc7\u6ee4\u4e00\u4e2a\u6574\u6570\u5217\u8868\u5e76\u8ba1\u7b97\u5176\u548c\uff1a<\/p>\n<pre>List&lt;Integer&gt; numbers = List.of(1, 2, 3, 4, 5, 6, 7, 8, 9, 10);\n\nint sum = numbers.stream()\n                .filter(n -&gt; n % 2 == 0) \/\/ \u8fc7\u6ee4\u5076\u6570\n                .reduce(0, (acc, n) -&gt; acc + n); \/\/ \u8ba1\u7b97\u603b\u548c\n\nSystem.out.println(sum); \/\/ \u8f93\u51fa\uff1a30<\/pre>\n<p>\u5728\u8fd9\u4e2a\u4f8b\u5b50\u4e2d\uff0c\u6211\u4eec\u9996\u5148\u521b\u5efa\u4e86\u4e00\u4e2a\u6574\u6570\u5217\u8868\u3002\u7136\u540e\uff0c\u6211\u4eec\u4f7f\u7528 <code>filter<\/code> \u65b9\u6cd5\u8fc7\u6ee4\u51fa\u5076\u6570\uff0c\u5e76\u4f7f\u7528 <code>reduce<\/code> \u65b9\u6cd5\u5c06\u5076\u6570\u7d2f\u52a0\u8d77\u6765\u3002\u6700\u540e\uff0c\u6211\u4eec\u6253\u5370\u51fa\u603b\u548c\u3002<\/p>\n<p><strong>\u4f18\u52bf<\/strong><\/p>\n<p>\u4f7f\u7528 Stream API \u7684\u4f18\u52bf\u5305\u62ec\uff1a<\/p>\n<ul>\n<li>\u7b80\u5316\u6570\u636e\u5904\u7406<\/li>\n<li>\u58f0\u660e\u5f0f\u7f16\u7a0b<\/li>\n<li>\u63d0\u9ad8\u6027\u80fd\uff08\u901a\u8fc7\u5e76\u884c\u5904\u7406\uff09<\/li>\n<li>\u53ef\u91cd\u7528\u4ee3\u7801<\/li>\n<li>\u53ef\u8bfb\u6027\u66f4\u4f73<\/li>\n<\/ul>\n<p>\u6587\u4e2d\u5173\u4e8ejava,\u51fd\u6570\u5f0f\u63a5\u53e3\u7684\u77e5\u8bc6\u4ecb\u7ecd\uff0c\u5e0c\u671b\u5bf9\u4f60\u7684\u5b66\u4e60\u6709\u6240\u5e2e\u52a9\uff01\u82e5\u662f\u53d7\u76ca\u532a\u6d45\uff0c\u90a3\u5c31\u52a8\u52a8\u9f20\u6807\u6536\u85cf\u8fd9\u7bc7\u300aJava\u51fd\u6570\u5f0f\u63a5\u53e3\u7684 Stream API\u300b\u6587\u7ae0\u5427\uff0c\u4e5f\u53ef\u5173\u6ce8\u516c\u4f17\u53f7\u4e86\u89e3\u76f8\u5173\u6280\u672f\u6587\u7ae0\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Java\u51fd\u6570\u5f0f\u63a5\u53e3\u7684 Strea&#46;&#46;&#46;<\/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-202636","post","type-post","status-publish","format-standard","hentry","category-4925"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/202636","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=202636"}],"version-history":[{"count":0,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/202636\/revisions"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=202636"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=202636"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=202636"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}