{"id":639,"date":"2025-02-11T15:56:03","date_gmt":"2025-02-11T07:56:03","guid":{"rendered":"http:\/\/xinsk.cn\/?p=639"},"modified":"2025-03-03T11:38:11","modified_gmt":"2025-03-03T03:38:11","slug":"java-stream-api%e4%b8%ad%e5%b8%b8%e7%94%a8%e7%9a%84%e5%87%bd%e6%95%b0%e5%8f%8a%e5%85%b6%e7%a4%ba%e4%be%8b","status":"publish","type":"post","link":"http:\/\/www.xinsk.cn\/?p=639","title":{"rendered":"Java Stream API\u4e2d\u5e38\u7528\u7684\u51fd\u6570\u53ca\u5176\u793a\u4f8b"},"content":{"rendered":"\n<p class=\"wp-block-paragraph\"><strong><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-luminous-vivid-orange-color\">1\u3001\u521b\u5efa\u6d41<\/mark><\/strong><\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>\/\/ \u4ece\u96c6\u5408\u521b\u5efa\u6d41\nList&lt;String&gt; list = Arrays.asList(\"apple\", \"banana\", \"cherry\");\nStream&lt;String&gt; streamFromList = list.stream();\n\n\/\/ \u4ece\u6570\u7ec4\u521b\u5efa\u6d41\nString&#91;] array = {\"apple\", \"banana\", \"cherry\"};\nStream&lt;String&gt; streamFromArray = Arrays.stream(array);<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\"><strong><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-luminous-vivid-orange-color\">2\u3001\u4e2d\u95f4\u64cd\u4f5c<\/mark><\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-vivid-cyan-blue-color\">\uff081\uff09<\/mark><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-black-color\"><code>filter(Predicate predicate)<\/code>\uff1a<\/mark><\/strong>\u7528\u4e8e\u8fc7\u6ee4\u6d41\u4e2d\u7684\u5143\u7d20\uff0c\u53ea\u4fdd\u7559\u6ee1\u8db3\u7ed9\u5b9a\u6761\u4ef6\u7684\u5143\u7d20\u3002<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>List&lt;Integer&gt; numbers = Arrays.asList(1, 2, 3, 4, 5);\nnumbers.stream().filter(n -&gt; n % 2 == 0).forEach(System.out::println); \/\/ \u8f93\u51fa\u5076\u6570<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\"><strong><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-vivid-cyan-blue-color\">\uff082\uff09<\/mark><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-black-color\"><code>map(Function mapper)<\/code>\uff1a<\/mark><\/strong>\u5c06\u6d41\u4e2d\u7684\u6bcf\u4e2a\u5143\u7d20\u6620\u5c04\u4e3a\u53e6\u4e00\u79cd\u5f62\u5f0f\uff0c\u4f8b\u5982\u7c7b\u578b\u8f6c\u6362\u6216\u63d0\u53d6\u4fe1\u606f\u3002<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>List&lt;String&gt; strings = Arrays.asList(\"apple\", \"banana\", \"cherry\");\nstrings.stream().map(String::length).forEach(System.out::println); \/\/ \u8f93\u51fa\u6bcf\u4e2a\u5b57\u7b26\u4e32\u7684\u957f\u5ea6<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\"><strong><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-vivid-cyan-blue-color\">\uff083\uff09<\/mark><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-black-color\"><code>sorted()<\/code>\uff1a<\/mark><\/strong>\u5bf9\u6d41\u4e2d\u7684\u5143\u7d20\u8fdb\u884c\u81ea\u7136\u6392\u5e8f\uff08\u5bf9\u4e8e\u6570\u503c\u578b\u662f\u5347\u5e8f\uff0c\u5bf9\u4e8e\u5b57\u7b26\u4e32\u662f\u5b57\u5178\u987a\u5e8f\uff09\u3002\u4e5f\u53ef\u4ee5\u63a5\u53d7\u4e00\u4e2aComparator\u6765\u6307\u5b9a\u6392\u5e8f\u89c4\u5219\u3002<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>List&lt;Integer&gt; numbers = Arrays.asList(5, 3, 4, 1, 2);\nnumbers.stream().sorted().forEach(System.out::println); \/\/ \u6309\u5347\u5e8f\u8f93\u51fa\u6570\u5b57<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\"><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-vivid-cyan-blue-color\"><strong>\uff084\uff09<\/strong><\/mark><strong><code><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-black-color\">distinct()\uff1a<\/mark><\/code><\/strong>\u53bb\u91cd<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>List&lt;Integer&gt; numbers = Arrays.asList(1, 2, 2, 3, 4, 4, 5);\nnumbers.stream().distinct().forEach(System.out::println); \/\/ \u53bb\u91cd\u540e\u8f93\u51fa<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\"><strong><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-vivid-cyan-blue-color\">\uff085\uff09<\/mark><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-black-color\"><code>limit(long maxSize)<\/code>\uff1a<\/mark><\/strong>\u622a\u53d6<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>List&lt;Integer&gt; numbers = Arrays.asList(1, 2, 3, 4, 5);\nnumbers.stream().limit(3).forEach(System.out::println); \/\/ \u8f93\u51fa\u524d\u4e09\u4e2a\u5143\u7d20<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\"><strong><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-vivid-cyan-blue-color\">\uff086\uff09<\/mark><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-black-color\"><code>skip(long n)<\/code>\uff1a<\/mark><\/strong>\u8df3\u8fc7<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>List&lt;Integer&gt; numbers = Arrays.asList(1, 2, 3, 4, 5);\nnumbers.stream().skip(2).forEach(System.out::println); \/\/ \u8df3\u8fc7\u524d\u4e24\u4e2a\u5143\u7d20\u540e\u8f93\u51fa\u5269\u4f59\u7684<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\"><strong><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-luminous-vivid-orange-color\">3\u3001\u7ec8\u7aef\u64cd\u4f5c<\/mark><\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-vivid-cyan-blue-color\">\uff081\uff09<\/mark><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-black-color\"><code>collect(Collector collector)<\/code>\uff1a<\/mark><\/strong>\u6536\u96c6\u6d41\u4e2d\u7684\u5143\u7d20\u5230\u4e0d\u540c\u7684\u5bb9\u5668\u4e2d\uff0c\u6bd4\u5982List\u3001Set\u7b49\u3002<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>List&lt;String&gt; strings = Arrays.asList(\"apple\", \"banana\", \"cherry\");\nList&lt;String&gt; filteredStrings = strings.stream().filter(s -&gt; s.startsWith(\"a\")).collect(Collectors.toList());\nSystem.out.println(filteredStrings); \/\/ \u8f93\u51fa\u4ee5'a'\u5f00\u5934\u7684\u5b57\u7b26\u4e32\u5217\u8868<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\"><strong><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-vivid-cyan-blue-color\">\uff082\uff09<\/mark><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-black-color\"><code>reduce(BinaryOperator accumulator)<\/code>\uff1a<\/mark><\/strong>\u901a\u8fc7\u7d2f\u52a0\u5668\u51fd\u6570\u5c06\u6d41\u4e2d\u7684\u5143\u7d20\u7ec4\u5408\u6210\u4e00\u4e2a\u5355\u4e00\u7684\u7ed3\u679c\u3002<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>List&lt;Integer&gt; numbers = Arrays.asList(1, 2, 3, 4, 5);\nint sum = numbers.stream().reduce(0, Integer::sum);\nSystem.out.println(sum); \/\/ \u8f93\u51fa\u603b\u548c\uff1a15<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\"><strong><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-vivid-cyan-blue-color\">\uff083\uff09<\/mark><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-black-color\"><code>forEach(Consumer action)<\/code>\uff1a<\/mark><\/strong>\u904d\u5386<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>List&lt;Integer&gt; numbers = Arrays.asList(1, 2, 3, 4, 5);\nnumbers.stream().forEach(System.out::println); \/\/ \u6253\u5370\u6240\u6709\u6570\u5b57<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\"><strong><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-vivid-cyan-blue-color\">\uff084\uff09<\/mark><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-black-color\"><code>count()<\/code>\uff1a<\/mark><\/strong>\u805a\u5408\u64cd\u4f5c\uff0c\u5f97\u51fa\u6570\u636e\u6570\u91cf<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>List&lt;Integer&gt; numbers = Arrays.asList(1, 2, 3, 4, 5);\nlong count = numbers.stream().count();\nSystem.out.println(count); \/\/ \u8f93\u51fa\u603b\u6570\uff1a5<\/code><\/pre>\n","protected":false},"excerpt":{"rendered":"<p>1\u3001\u521b\u5efa\u6d41 2\u3001\u4e2d\u95f4\u64cd\u4f5c \uff081\uff09filter(Predicate predicate)\uff1a\u7528\u4e8e\u8fc7\u6ee4\u6d41\u4e2d\u7684\u5143\u7d20\uff0c\u53ea [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":650,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-639","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-other"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.7 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Java Stream API\u4e2d\u5e38\u7528\u7684\u51fd\u6570\u53ca\u5176\u793a\u4f8b - YW<\/title>\n<meta name=\"description\" content=\"Java\u4e2dStream\u6d41\u5904\u7406\u5e38\u7528\u51fd\u6570\uff0c\u53ef\u5bf9\u6570\u636e\u6d41\u8fdb\u884c\u8fc7\u6ee4\uff0c\u805a\u5408\uff0c\u53bb\u91cd\u7b49\u64cd\u4f5c\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"http:\/\/www.xinsk.cn\/?p=639\" \/>\n<meta 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