{"id":31552,"date":"2023-07-05T14:00:21","date_gmt":"2023-09-20T21:46:38","guid":{"rendered":"https:\/\/www.silicloud.com\/zh\/blog\/java%e7%9a%84stream-api\/"},"modified":"2024-04-30T12:07:26","modified_gmt":"2024-04-30T04:07:26","slug":"java%e7%9a%84stream-api","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/zh\/blog\/java%e7%9a%84stream-api\/","title":{"rendered":"Java\u7684Stream API"},"content":{"rendered":"<h1>\u9996\u5148<\/h1>\n<p>\u5927\u5bb6\u597d\uff0c\u4f60\u4eec\u90fd\u5728\u7528Java\u5417\uff01\u6700\u8fd1\u6211\u5199\u7684\u4e1c\u897f\u5f88\u591a\uff0c\u4f46\u662f\u81ea\u4ece\u5b9e\u73b0\u4e86Stream API\u4e4b\u540e\uff0c\u611f\u89c9\u53d8\u5f97\u975e\u5e38\u65b9\u4fbf\u3002<br \/>\n\u867d\u7136\u6211\u80fd\u8fc5\u901f\u60f3\u5230Stream.forEach\u548cStream.filter\u8fd9\u6837\u7684\u5e38\u89c1\u7528\u6cd5\uff0c<br \/>\n\u4f46\u4e5f\u6709\u4e00\u4e9b\u4e0d\u5e38\u7528\u7684\u7528\u6cd5\u6211\u60f3\u4e0d\u8d77\u6765\uff0c\u6240\u4ee5\u6211\u6253\u7b97\u7559\u4e0b\u5907\u5fd8\u5f55\u3002<\/p>\n<h1>\u6d41\u751f\u6210<\/h1>\n<p>\u521b\u5efa\u4e00\u4e2a\u65e0\u5e8f\u7684\u65e0\u9650\u6d41\u3002<br \/>\n\u8fd9\u5728\u751f\u6210\u968f\u673a\u6570\u7b49\u65e0\u5173\u7d27\u8981\u503c\u65f6\u975e\u5e38\u65b9\u4fbf\u3002<\/p>\n<p>\u6587\u4ef6\uff1a\u6587\u6863<\/p>\n<h2>\u4ee3\u7801<\/h2>\n<pre class=\"post-pre\"><code>    <span class=\"kd\">public<\/span> <span class=\"kd\">static<\/span> <span class=\"kt\">void<\/span> <span class=\"nf\">main<\/span><span class=\"o\">(<\/span><span class=\"nc\">String<\/span><span class=\"o\">[]<\/span> <span class=\"n\">args<\/span><span class=\"o\">)<\/span> <span class=\"o\">{<\/span>\r\n        <span class=\"nc\">Stream<\/span><span class=\"o\">&lt;<\/span><span class=\"nc\">Double<\/span><span class=\"o\">&gt;<\/span> <span class=\"n\">stream<\/span> <span class=\"o\">=<\/span> <span class=\"nc\">Stream<\/span><span class=\"o\">.<\/span><span class=\"na\">generate<\/span><span class=\"o\">(()<\/span> <span class=\"o\">-&gt;<\/span> <span class=\"nc\">Math<\/span><span class=\"o\">.<\/span><span class=\"na\">random<\/span><span class=\"o\">());<\/span>\r\n        <span class=\"n\">stream<\/span><span class=\"o\">.<\/span><span class=\"na\">limit<\/span><span class=\"o\">(<\/span><span class=\"mi\">5<\/span><span class=\"o\">).<\/span><span class=\"na\">forEach<\/span><span class=\"o\">(<\/span><span class=\"nc\">System<\/span><span class=\"o\">.<\/span><span class=\"na\">out<\/span><span class=\"o\">::<\/span><span class=\"n\">println<\/span><span class=\"o\">);<\/span>\r\n    <span class=\"o\">}<\/span>\r\n<\/code><\/pre>\n<h2>\u7ed3\u679c (ji\u00e9 gu\u01d2)<\/h2>\n<pre class=\"post-pre\"><code><span class=\"mf\">0.022804976867977667<\/span>\r\n<span class=\"mf\">0.06422820749702451<\/span>\r\n<span class=\"mf\">0.7240936837411123<\/span>\r\n<span class=\"mf\">0.9070898332933144<\/span>\r\n<span class=\"mf\">0.6724389714182997<\/span>\r\n<\/code><\/pre>\n<h1>\u6d41.anyMatch<\/h1>\n<p>\u5982\u679c\u6709\u4e00\u4e2a\u8c13\u8bcd\uff08Predicate\uff09\u4f5c\u4e3a\u53c2\u6570\uff0c\u53ea\u8981\u5b58\u5728\u4e00\u4e2a\u7b26\u5408\u6761\u4ef6\u7684\u503c\uff0c\u5c31\u4f1a\u8fd4\u56detrue\u3002<\/p>\n<p>\u6587\u4ef6\uff1a\u6587\u6863<\/p>\n<h2>\u4ee3\u78bc<\/h2>\n<pre class=\"post-pre\"><code>    <span class=\"kd\">public<\/span> <span class=\"kd\">static<\/span> <span class=\"kt\">void<\/span> <span class=\"nf\">main<\/span><span class=\"o\">(<\/span><span class=\"nc\">String<\/span><span class=\"o\">[]<\/span> <span class=\"n\">args<\/span><span class=\"o\">)<\/span> <span class=\"o\">{<\/span>\r\n        <span class=\"nc\">List<\/span><span class=\"o\">&lt;<\/span><span class=\"nc\">String<\/span><span class=\"o\">&gt;<\/span> <span class=\"n\">strList<\/span> <span class=\"o\">=<\/span> <span class=\"nc\">Arrays<\/span><span class=\"o\">.<\/span><span class=\"na\">asList<\/span><span class=\"o\">(<\/span><span class=\"s\">\"dog\"<\/span><span class=\"o\">,<\/span> <span class=\"s\">\"cat\"<\/span><span class=\"o\">,<\/span> <span class=\"s\">\"bird\"<\/span><span class=\"o\">);<\/span>\r\n        <span class=\"kt\">boolean<\/span> <span class=\"n\">match<\/span> <span class=\"o\">=<\/span> <span class=\"n\">strList<\/span><span class=\"o\">.<\/span><span class=\"na\">stream<\/span><span class=\"o\">().<\/span><span class=\"na\">anyMatch<\/span><span class=\"o\">(<\/span><span class=\"n\">e<\/span> <span class=\"o\">-&gt;<\/span> <span class=\"n\">e<\/span><span class=\"o\">.<\/span><span class=\"na\">equals<\/span><span class=\"o\">(<\/span><span class=\"s\">\"dog\"<\/span><span class=\"o\">));<\/span>\r\n        <span class=\"nc\">System<\/span><span class=\"o\">.<\/span><span class=\"na\">out<\/span><span class=\"o\">.<\/span><span class=\"na\">println<\/span><span class=\"o\">(<\/span><span class=\"n\">match<\/span><span class=\"o\">);<\/span>\r\n    <span class=\"o\">}<\/span>\r\n<\/code><\/pre>\n<h2>\u7ed3\u679c (ji\u00e9 gu\u01d2)<\/h2>\n<pre class=\"post-pre\"><code><span class=\"kc\">true<\/span>\r\n<\/code><\/pre>\n<h1>Stream.allMatch \u68c0\u67e5\u6d41\u4e2d\u7684\u6240\u6709\u5143\u7d20\u662f\u5426\u90fd\u6ee1\u8db3\u7ed9\u5b9a\u7684\u6761\u4ef6\u3002<\/h1>\n<p>\u5982\u679c\u6240\u6709\u6761\u4ef6\u5339\u914d\uff0c\u90a3\u4e48\u5c06 Predicate \u4f5c\u4e3a\u53c2\u6570\u7684\u503c\u8fd4\u56de\u4e3a true\u3002<\/p>\n<p>\u6587\u4ef6\uff1a\u6587\u6863<\/p>\n<h2>\u4ee3\u7801 (Mandarin Chinese translation)<\/h2>\n<pre class=\"post-pre\"><code>    <span class=\"kd\">public<\/span> <span class=\"kd\">static<\/span> <span class=\"kt\">void<\/span> <span class=\"nf\">main<\/span><span class=\"o\">(<\/span><span class=\"nc\">String<\/span><span class=\"o\">[]<\/span> <span class=\"n\">args<\/span><span class=\"o\">)<\/span> <span class=\"o\">{<\/span>\r\n        <span class=\"nc\">List<\/span><span class=\"o\">&lt;<\/span><span class=\"nc\">String<\/span><span class=\"o\">&gt;<\/span> <span class=\"n\">strList<\/span> <span class=\"o\">=<\/span> <span class=\"nc\">Arrays<\/span><span class=\"o\">.<\/span><span class=\"na\">asList<\/span><span class=\"o\">(<\/span><span class=\"s\">\"dog\"<\/span><span class=\"o\">,<\/span> <span class=\"s\">\"cat\"<\/span><span class=\"o\">,<\/span> <span class=\"s\">\"bird\"<\/span><span class=\"o\">);<\/span>\r\n        <span class=\"kt\">boolean<\/span> <span class=\"n\">match<\/span> <span class=\"o\">=<\/span> <span class=\"n\">strList<\/span><span class=\"o\">.<\/span><span class=\"na\">stream<\/span><span class=\"o\">().<\/span><span class=\"na\">allMatch<\/span><span class=\"o\">(<\/span><span class=\"n\">e<\/span> <span class=\"o\">-&gt;<\/span> <span class=\"n\">e<\/span><span class=\"o\">.<\/span><span class=\"na\">equals<\/span><span class=\"o\">(<\/span><span class=\"s\">\"dog\"<\/span><span class=\"o\">));<\/span>\r\n        <span class=\"nc\">System<\/span><span class=\"o\">.<\/span><span class=\"na\">out<\/span><span class=\"o\">.<\/span><span class=\"na\">println<\/span><span class=\"o\">(<\/span><span class=\"n\">match<\/span><span class=\"o\">);<\/span>\r\n    <span class=\"o\">}<\/span>\r\n<\/code><\/pre>\n<h2>\u7ed3\u5c40<\/h2>\n<pre class=\"post-pre\"><code><span class=\"kc\">false<\/span>\r\n<\/code><\/pre>\n<h1>Stream.noneMatch &#8211; \u6d41.noneMatch<\/h1>\n<p>\u5982\u679c\u6ca1\u6709\u7b26\u5408\u6761\u4ef6\u7684\u503c\uff0c\u5c06 Predicate \u4f5c\u4e3a\u53c2\u6570\uff0c\u8fd4\u56de true\u3002<\/p>\n<p>\u6587\u4ef6\uff1a\u6587\u6863<\/p>\n<h2>\u7ffb\u8bd1\u6210\u4e2d\u6587:<br \/>\n\u7a0b\u5f0f\u7801<\/h2>\n<pre class=\"post-pre\"><code>    <span class=\"kd\">public<\/span> <span class=\"kd\">static<\/span> <span class=\"kt\">void<\/span> <span class=\"nf\">main<\/span><span class=\"o\">(<\/span><span class=\"nc\">String<\/span><span class=\"o\">[]<\/span> <span class=\"n\">args<\/span><span class=\"o\">)<\/span> <span class=\"o\">{<\/span>\r\n        <span class=\"nc\">List<\/span><span class=\"o\">&lt;<\/span><span class=\"nc\">String<\/span><span class=\"o\">&gt;<\/span> <span class=\"n\">strList<\/span> <span class=\"o\">=<\/span> <span class=\"nc\">Arrays<\/span><span class=\"o\">.<\/span><span class=\"na\">asList<\/span><span class=\"o\">(<\/span><span class=\"s\">\"dog\"<\/span><span class=\"o\">,<\/span> <span class=\"s\">\"cat\"<\/span><span class=\"o\">,<\/span> <span class=\"s\">\"bird\"<\/span><span class=\"o\">);<\/span>\r\n        <span class=\"kt\">boolean<\/span> <span class=\"n\">match<\/span> <span class=\"o\">=<\/span> <span class=\"n\">strList<\/span><span class=\"o\">.<\/span><span class=\"na\">stream<\/span><span class=\"o\">().<\/span><span class=\"na\">noneMatch<\/span><span class=\"o\">(<\/span><span class=\"n\">e<\/span> <span class=\"o\">-&gt;<\/span> <span class=\"n\">e<\/span><span class=\"o\">.<\/span><span class=\"na\">equals<\/span><span class=\"o\">(<\/span><span class=\"s\">\"fish\"<\/span><span class=\"o\">));<\/span>\r\n        <span class=\"nc\">System<\/span><span class=\"o\">.<\/span><span class=\"na\">out<\/span><span class=\"o\">.<\/span><span class=\"na\">println<\/span><span class=\"o\">(<\/span><span class=\"n\">match<\/span><span class=\"o\">);<\/span>\r\n    <span class=\"o\">}<\/span>\r\n<\/code><\/pre>\n<h2>\u7ed3\u679c (ji\u00e9 gu\u01d2)<\/h2>\n<pre class=\"post-pre\"><code><span class=\"kc\">true<\/span>\r\n<\/code><\/pre>\n<h1>\u6d41.\u53d6\u524dN\u4e2a<\/h1>\n<p>\u4f5c\u4e3a\u53c2\u6570\u4f20\u5165 Predicate\uff0c\u8fd4\u56de\u7b26\u5408\u6761\u4ef6\u7684\u503c\uff0c\u4f8b\u5982\u4e0b\u4f8b\u4e2d\u8fd4\u56de\u5c0f\u4e8e0\u7684\u6570\u5b57\u3002<\/p>\n<p>\u6587\u4ef6\uff1a\u6587\u6863<\/p>\n<h2>\u4ee3\u7801 m\u01ce)<\/h2>\n<pre class=\"post-pre\"><code>    <span class=\"kd\">public<\/span> <span class=\"kd\">static<\/span> <span class=\"kt\">void<\/span> <span class=\"nf\">main<\/span><span class=\"o\">(<\/span><span class=\"nc\">String<\/span><span class=\"o\">[]<\/span> <span class=\"n\">args<\/span><span class=\"o\">)<\/span> <span class=\"o\">{<\/span>\r\n        <span class=\"nc\">List<\/span><span class=\"o\">&lt;<\/span><span class=\"nc\">Integer<\/span><span class=\"o\">&gt;<\/span> <span class=\"n\">numList<\/span> <span class=\"o\">=<\/span> <span class=\"nc\">Arrays<\/span><span class=\"o\">.<\/span><span class=\"na\">asList<\/span><span class=\"o\">(<\/span>\r\n                <span class=\"o\">-<\/span><span class=\"mi\">5<\/span><span class=\"o\">,<\/span> <span class=\"o\">-<\/span><span class=\"mi\">4<\/span><span class=\"o\">,<\/span> <span class=\"o\">-<\/span><span class=\"mi\">3<\/span><span class=\"o\">,<\/span> <span class=\"o\">-<\/span><span class=\"mi\">2<\/span><span class=\"o\">,<\/span> <span class=\"o\">-<\/span><span class=\"mi\">1<\/span><span class=\"o\">,<\/span> <span class=\"mi\">0<\/span><span class=\"o\">,<\/span> <span class=\"mi\">1<\/span><span class=\"o\">,<\/span> <span class=\"mi\">2<\/span><span class=\"o\">,<\/span> <span class=\"mi\">3<\/span><span class=\"o\">,<\/span> <span class=\"mi\">4<\/span><span class=\"o\">,<\/span> <span class=\"mi\">5<\/span>\r\n        <span class=\"o\">);<\/span>\r\n        <span class=\"n\">numList<\/span><span class=\"o\">.<\/span><span class=\"na\">stream<\/span><span class=\"o\">().<\/span><span class=\"na\">takeWhile<\/span><span class=\"o\">(<\/span><span class=\"n\">x<\/span> <span class=\"o\">-&gt;<\/span> <span class=\"n\">x<\/span> <span class=\"o\">&lt;<\/span> <span class=\"mi\">0<\/span><span class=\"o\">).<\/span><span class=\"na\">forEach<\/span><span class=\"o\">(<\/span><span class=\"nc\">System<\/span><span class=\"o\">.<\/span><span class=\"na\">out<\/span><span class=\"o\">::<\/span><span class=\"n\">println<\/span><span class=\"o\">);<\/span>\r\n    <span class=\"o\">}<\/span>\r\n<\/code><\/pre>\n<h2>\u7ed3\u679c (ji\u00e9 gu\u01d2) &#8211; result<\/h2>\n<pre class=\"post-pre\"><code><span class=\"o\">-<\/span><span class=\"mi\">5<\/span>\r\n<span class=\"o\">-<\/span><span class=\"mi\">4<\/span>\r\n<span class=\"o\">-<\/span><span class=\"mi\">3<\/span>\r\n<span class=\"o\">-<\/span><span class=\"mi\">2<\/span>\r\n<span class=\"o\">-<\/span><span class=\"mi\">1<\/span>\r\n<\/code><\/pre>\n<h1>\u6d41.\u4e22\u5f03\u5f53 (li\u00fa.<\/h1>\n<p>\u5c06 Predicate \u4f5c\u4e3a\u53c2\u6570\uff0c\u8fd4\u56de\u4e0d\u6ee1\u8db3\u6761\u4ef6\u7684\u503c\u3002<br \/>\n\u4ee5\u4e0b\u793a\u4f8b\u4e2d\u5c06\u8fd4\u56de\u5927\u4e8e\u7b49\u4e8e0\u7684\u6570\u5b57\u3002<\/p>\n<p>\u6587\u4ef6\uff1a\u6587\u6863<\/p>\n<h2>\u9898\u76ee\u8981\u6c42\u5c06&#8221;\u30b3\u30fc\u30c9&#8221;\u4ee5\u4e2d\u6587\u6bcd\u8bed\u65b9\u5f0f\u8fdb\u884c\u6539\u5199\u3002<\/h2>\n<pre class=\"post-pre\"><code>    <span class=\"kd\">public<\/span> <span class=\"kd\">static<\/span> <span class=\"kt\">void<\/span> <span class=\"nf\">main<\/span><span class=\"o\">(<\/span><span class=\"nc\">String<\/span><span class=\"o\">[]<\/span> <span class=\"n\">args<\/span><span class=\"o\">)<\/span> <span class=\"o\">{<\/span>\r\n        <span class=\"nc\">List<\/span><span class=\"o\">&lt;<\/span><span class=\"nc\">Integer<\/span><span class=\"o\">&gt;<\/span> <span class=\"n\">numList<\/span> <span class=\"o\">=<\/span> <span class=\"nc\">Arrays<\/span><span class=\"o\">.<\/span><span class=\"na\">asList<\/span><span class=\"o\">(<\/span>\r\n                <span class=\"o\">-<\/span><span class=\"mi\">5<\/span><span class=\"o\">,<\/span> <span class=\"o\">-<\/span><span class=\"mi\">4<\/span><span class=\"o\">,<\/span> <span class=\"o\">-<\/span><span class=\"mi\">3<\/span><span class=\"o\">,<\/span> <span class=\"o\">-<\/span><span class=\"mi\">2<\/span><span class=\"o\">,<\/span> <span class=\"o\">-<\/span><span class=\"mi\">1<\/span><span class=\"o\">,<\/span> <span class=\"mi\">0<\/span><span class=\"o\">,<\/span> <span class=\"mi\">1<\/span><span class=\"o\">,<\/span> <span class=\"mi\">2<\/span><span class=\"o\">,<\/span> <span class=\"mi\">3<\/span><span class=\"o\">,<\/span> <span class=\"mi\">4<\/span><span class=\"o\">,<\/span> <span class=\"mi\">5<\/span>\r\n        <span class=\"o\">);<\/span>\r\n        <span class=\"n\">numList<\/span><span class=\"o\">.<\/span><span class=\"na\">stream<\/span><span class=\"o\">().<\/span><span class=\"na\">dropWhile<\/span><span class=\"o\">(<\/span><span class=\"n\">x<\/span> <span class=\"o\">-&gt;<\/span> <span class=\"n\">x<\/span> <span class=\"o\">&lt;<\/span> <span class=\"mi\">0<\/span><span class=\"o\">).<\/span><span class=\"na\">forEach<\/span><span class=\"o\">(<\/span><span class=\"nc\">System<\/span><span class=\"o\">.<\/span><span class=\"na\">out<\/span><span class=\"o\">::<\/span><span class=\"n\">println<\/span><span class=\"o\">);<\/span>\r\n    <span class=\"o\">}<\/span>\r\n<\/code><\/pre>\n<h2>\u7ed3\u679c<\/h2>\n<pre class=\"post-pre\"><code><span class=\"mi\">0<\/span>\r\n<span class=\"mi\">1<\/span>\r\n<span class=\"mi\">2<\/span>\r\n<span class=\"mi\">3<\/span>\r\n<span class=\"mi\">4<\/span>\r\n<span class=\"mi\">5<\/span>\r\n<\/code><\/pre>\n<h1>\u6700\u5f8c\uff0c\u6700\u540e\u7684<\/h1>\n<p>StreamAPI\u975e\u5e38\u65b9\u4fbf\uff0c\u662f\u5427\u3002<br \/>\n\u6211\u4eec\u5e94\u8be5\u79ef\u6781\u4f7f\u7528\u5b83\uff0c\u671d\u7740\u80fd\u591f\u76f4\u89c2\u7406\u89e3\u7684\u4ee3\u7801\u76ee\u6807\u524d\u8fdb\u3002<br \/>\n\u867d\u7136\u7b80\u77ed\uff0c\u4f46\u5c31\u662f\u8fd9\u6837\u4e86\u3002\u975e\u5e38\u611f\u8c22\uff01<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u9996\u5148 \u5927\u5bb6\u597d\uff0c\u4f60\u4eec\u90fd\u5728\u7528Java\u5417\uff01\u6700\u8fd1\u6211\u5199\u7684\u4e1c\u897f\u5f88\u591a\uff0c\u4f46\u662f\u81ea\u4ece\u5b9e\u73b0\u4e86Stream API\u4e4b\u540e\uff0c\u611f\u89c9\u53d8\u5f97\u975e\u5e38\u65b9 [&hellip;]<\/p>\n","protected":false},"author":4,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-31552","post","type-post","status-publish","format-standard","hentry","category-uncategorized"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v21.5 (Yoast SEO v21.5) - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Java\u7684Stream API - Blog - Silicon Cloud<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.silicloud.com\/zh\/blog\/java\u7684stream-api\/\" 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