{"id":31061,"date":"2024-01-27T11:26:28","date_gmt":"2022-12-27T01:23:38","guid":{"rendered":"https:\/\/www.silicloud.com\/zh\/blog\/%e4%bd%bf%e7%94%a8java%e4%b8%ad%e7%9a%84stream%e6%93%8d%e4%bd%9c\/"},"modified":"2025-08-12T22:07:19","modified_gmt":"2025-08-12T14:07:19","slug":"%e4%bd%bf%e7%94%a8java%e4%b8%ad%e7%9a%84stream%e6%93%8d%e4%bd%9c","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/zh\/blog\/%e4%bd%bf%e7%94%a8java%e4%b8%ad%e7%9a%84stream%e6%93%8d%e4%bd%9c\/","title":{"rendered":"\u4f7f\u7528Java\u4e2d\u7684Stream\u64cd\u4f5c"},"content":{"rendered":"

\u5c06\u5176\u8f6c\u6362\u4e3a\u6570\u7ec4<\/p>\n
Stream<\/span><<\/span>String<\/span>><\/span> streamString<\/span> =<\/span> Stream<\/span>.<\/span>of<\/span>(<\/span>\"a\"<\/span>,<\/span> \"b\"<\/span>,<\/span> \"c\"<\/span>);<\/span>\r\nString<\/span>[]<\/span> stringArray<\/span> =<\/span> streamString<\/span>.<\/span>toArray<\/span>(<\/span>String<\/span>[]::<\/span>new<\/span>);<\/span>\r\n<\/code><\/pre>\n
Stream\u4e4b\u95f4\u7684\u8fde\u63a5<\/p>\n
Stream<\/span>.<\/span>concat<\/span>(<\/span>stream1<\/span>,<\/span> stream2<\/span>,<\/span> ...)<\/span>\r\n\r\n\/\/ \uff12\u3064\u306eStream\u3092\u7d50\u5408\u3059\u308b\u4f8b<\/span>\r\nList<\/span><<\/span>String<\/span>><\/span> values<\/span> =<\/span> Stream<\/span>.<\/span>concat<\/span>(<\/span>\r\n        Stream<\/span>.<\/span>of<\/span>(<\/span>\"a\"<\/span>,<\/span> \"b\"<\/span>,<\/span> \"c\"<\/span>),<\/span>\r\n        Stream<\/span>.<\/span>of<\/span>(<\/span>\"d\"<\/span>,<\/span> \"e\"<\/span>))<\/span>\r\n        .<\/span>collect<\/span>(<\/span>Collectors<\/span>.<\/span>toList<\/span>());<\/span>\r\nSystem<\/span>.<\/span>out<\/span>.<\/span>println<\/span>(<\/span>values<\/span>);<\/span> \/\/ -> [a, b, c, d, e]<\/span>\r\n<\/code><\/pre>\n
\u7528IntStream\u8fed\u4ee3\u6570\u503c\u7684\u8303\u56f4<\/p>\n
\/\/ for\u3092\u5229\u7528\u30571\u301c9\u307e\u3067\u30eb\u30fc\u30d7<\/span>\r\nList<\/span><<\/span>String<\/span>><\/span> values<\/span> =<\/span> new<\/span> ArrayList<\/span><>();<\/span>\r\nfor<\/span> (<\/span>int<\/span> i<\/span> =<\/span> 1<\/span>;<\/span> i<\/span> <<\/span> 10<\/span>;<\/span> i<\/span>++)<\/span> {<\/span>\r\n    values<\/span>.<\/span>add<\/span>(<\/span>\"value:\"<\/span> +<\/span> i<\/span>);<\/span>\r\n}<\/span>\r\nSystem<\/span>.<\/span>out<\/span>.<\/span>println<\/span>(<\/span>values<\/span>);<\/span> \/\/ -> [value:1, value:2, value:3, value:4, value:5, value:6, value:7, value:8, value:9]<\/span>\r\n\r\n\/\/ IntStream\u30671\u301c9\u307e\u3067\u306eStream\u3092\u751f\u6210<\/span>\r\nList<\/span><<\/span>String<\/span>><\/span> values<\/span> =<\/span> IntStream<\/span>.<\/span>range<\/span>(<\/span>1<\/span>,<\/span> 10<\/span>)<\/span>\r\n        .<\/span>boxed<\/span>()<\/span>\r\n        .<\/span>map<\/span>(<\/span>value<\/span> -><\/span> \"value:\"<\/span> +<\/span> value<\/span>)<\/span>\r\n        .<\/span>collect<\/span>(<\/span>Collectors<\/span>.<\/span>toList<\/span>());<\/span>\r\nSystem<\/span>.<\/span>out<\/span>.<\/span>println<\/span>(<\/span>values<\/span>);<\/span> \/\/ -> [value:1, value:2, value:3, value:4, value:5, value:6, value:7, value:8, value:9]<\/span>\r\n<\/code><\/pre>\n
\u81ea\u5b9a\u4e49\u6536\u85cf\u5bb6<\/p>\n
Stream<\/span><<\/span>String<\/span>><\/span> stream<\/span> =<\/span> Stream<\/span>.<\/span>of<\/span>(<\/span>\"apple\"<\/span>,<\/span> \"banana\"<\/span>,<\/span> \"cherry\"<\/span>);<\/span>\r\nString<\/span> result<\/span> =<\/span> stream<\/span>.<\/span>collect<\/span>(<\/span>\r\n    Collector<\/span>.<\/span>of<\/span>(<\/span>\r\n        StringBuilder:<\/span>:<\/span>new<\/span>,<\/span>\r\n        StringBuilder:<\/span>:<\/span>append<\/span>,<\/span>\r\n        StringBuilder:<\/span>:<\/span>append<\/span>,<\/span>\r\n        StringBuilder:<\/span>:<\/span>toString<\/span>\r\n    )<\/span>\r\n);<\/span>\r\n\r\nSystem<\/span>.<\/span>out<\/span>.<\/span>println<\/span>(<\/span>result<\/span>);<\/span> \/\/ -> applebananacherry<\/span>\r\n<\/code><\/pre>\n
\u5d4c\u5957\u6536\u85cf\u5668\u7684\u793a\u4f8b<\/p>\n
record<\/span> Person<\/span>(<\/span>String<\/span> name<\/span>,<\/span> int<\/span> age<\/span>,<\/span> String<\/span> city<\/span>)<\/span> {<\/span>\r\n}<\/span>\r\n\r\nList<\/span><<\/span>Person<\/span>><\/span> people<\/span> =<\/span> Arrays<\/span>.<\/span>asList<\/span>(<\/span>\r\n    new<\/span> Person<\/span>(<\/span>\"Alice\"<\/span>,<\/span> 23<\/span>,<\/span> \"London\"<\/span>),<\/span>\r\n    new<\/span> Person<\/span>(<\/span>\"Bob\"<\/span>,<\/span> 28<\/span>,<\/span> \"New York\"<\/span>),<\/span>\r\n    new<\/span> Person<\/span>(<\/span>\"Charlie\"<\/span>,<\/span> 33<\/span>,<\/span> \"London\"<\/span>),<\/span>\r\n    new<\/span> Person<\/span>(<\/span>\"Diana\"<\/span>,<\/span> 40<\/span>,<\/span> \"New York\"<\/span>),<\/span>\r\n    new<\/span> Person<\/span>(<\/span>\"Eve\"<\/span>,<\/span> 28<\/span>,<\/span> \"London\"<\/span>),<\/span>\r\n    new<\/span> Person<\/span>(<\/span>\"Frank\"<\/span>,<\/span> 33<\/span>,<\/span> \"New York\"<\/span>)<\/span>\r\n);<\/span>\r\n\r\nMap<\/span><<\/span>String<\/span>,<\/span> Map<\/span><<\/span>Integer<\/span>,<\/span> List<\/span><<\/span>String<\/span>>>><\/span> groupedByCityAgeAndNames<\/span> =<\/span> people<\/span>.<\/span>stream<\/span>()<\/span>\r\n    .<\/span>collect<\/span>(<\/span>\r\n        Collectors<\/span>.<\/span>groupingBy<\/span>(<\/span>\r\n            Person:<\/span>:<\/span>city<\/span>,<\/span> Collectors<\/span>.<\/span>groupingBy<\/span>(<\/span>\r\n                Person:<\/span>:<\/span>age<\/span>,<\/span> Collectors<\/span>.<\/span>mapping<\/span>(<\/span>\r\n                    Person:<\/span>:<\/span>name<\/span>,<\/span> Collectors<\/span>.<\/span>toList<\/span>()<\/span>\r\n                )<\/span>\r\n            )<\/span>\r\n        )<\/span>\r\n    );<\/span>\r\n\r\nSystem<\/span>.<\/span>out<\/span>.<\/span>println<\/span>(<\/span>groupedByCityAgeAndNames<\/span>);<\/span> \/\/ -> {New York={33=[Frank], 40=[Diana], 28=[Bob]}, London={33=[Charlie], 23=[Alice], 28=[Eve]}}<\/span>\r\n<\/code><\/pre>\n","protected":false},"excerpt":{"rendered":"
\u5c06\u5176\u8f6c\u6362\u4e3a\u6570\u7ec4 Stream<String> streamString = Stream.of(” […]<\/p>\n","protected":false},"author":8,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[227],"class_list":["post-31061","post","type-post","status-publish","format-standard","hentry","category-uncategorized","tag-227"],"yoast_head":"\n\u4f7f\u7528Java\u4e2d\u7684Stream\u64cd\u4f5c - Blog - Silicon Cloud<\/title>\n<meta name=\"description\" content=\"\u5173\u4e8e\u4f7f\u7528Java\u4e2d\u7684Stream\u64cd\u4f5c\u7684\u6280\u672f\u6587\u7ae0\" \/>\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\/\u4f7f\u7528java\u4e2d\u7684stream\u64cd\u4f5c\/\" \/>\n<meta property=\"og:locale\" content=\"zh_CN\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"\u4f7f\u7528Java\u4e2d\u7684Stream\u64cd\u4f5c\" \/>\n<meta property=\"og:description\" content=\"\u5173\u4e8e\u4f7f\u7528Java\u4e2d\u7684Stream\u64cd\u4f5c\u7684\u6280\u672f\u6587\u7ae0\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.silicloud.com\/zh\/blog\/\u4f7f\u7528java\u4e2d\u7684stream\u64cd\u4f5c\/\" \/>\n<meta property=\"og:site_name\" content=\"Blog - Silicon Cloud\" \/>\n<meta property=\"article:published_time\" content=\"2022-12-27T01:23:38+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2025-08-12T14:07:19+00:00\" \/>\n<meta name=\"author\" content=\"\u96c5, \u609f\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"\u4f5c\u8005\" \/>\n\t<meta name=\"twitter:data1\" content=\"\u96c5, \u609f\" \/>\n\t<meta name=\"twitter:label2\" content=\"\u9884\u8ba1\u9605\u8bfb\u65f6\u95f4\" \/>\n\t<meta name=\"twitter:data2\" content=\"1 \u5206\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"WebPage\",\"@id\":\"https:\/\/www.silicloud.com\/zh\/blog\/%e4%bd%bf%e7%94%a8java%e4%b8%ad%e7%9a%84stream%e6%93%8d%e4%bd%9c\/\",\"url\":\"https:\/\/www.silicloud.com\/zh\/blog\/%e4%bd%bf%e7%94%a8java%e4%b8%ad%e7%9a%84stream%e6%93%8d%e4%bd%9c\/\",\"name\":\"\u4f7f\u7528Java\u4e2d\u7684Stream\u64cd\u4f5c - Blog - Silicon Cloud\",\"isPartOf\":{\"@id\":\"https:\/\/www.silicloud.com\/zh\/blog\/#website\"},\"datePublished\":\"2022-12-27T01:23:38+00:00\",\"dateModified\":\"2025-08-12T14:07:19+00:00\",\"author\":{\"@id\":\"https:\/\/www.silicloud.com\/zh\/blog\/#\/schema\/person\/f044a4b7fa4ee2701702942002419ca6\"},\"description\":\"\u5173\u4e8e\u4f7f\u7528Java\u4e2d\u7684Stream\u64cd\u4f5c\u7684\u6280\u672f\u6587\u7ae0\",\"breadcrumb\":{\"@id\":\"https:\/\/www.silicloud.com\/zh\/blog\/%e4%bd%bf%e7%94%a8java%e4%b8%ad%e7%9a%84stream%e6%93%8d%e4%bd%9c\/#breadcrumb\"},\"inLanguage\":\"zh-Hans\",\"potentialAction\":[{\"@type\":\"ReadAction\",\"target\":[\"https:\/\/www.silicloud.com\/zh\/blog\/%e4%bd%bf%e7%94%a8java%e4%b8%ad%e7%9a%84stream%e6%93%8d%e4%bd%9c\/\"]}]},{\"@type\":\"BreadcrumbList\",\"@id\":\"https:\/\/www.silicloud.com\/zh\/blog\/%e4%bd%bf%e7%94%a8java%e4%b8%ad%e7%9a%84stream%e6%93%8d%e4%bd%9c\/#breadcrumb\",\"itemListElement\":[{\"@type\":\"ListItem\",\"position\":1,\"name\":\"\u9996\u9875\",\"item\":\"https:\/\/www.silicloud.com\/zh\/blog\/\"},{\"@type\":\"ListItem\",\"position\":2,\"name\":\"\u4f7f\u7528Java\u4e2d\u7684Stream\u64cd\u4f5c\"}]},{\"@type\":\"WebSite\",\"@id\":\"https:\/\/www.silicloud.com\/zh\/blog\/#website\",\"url\":\"https:\/\/www.silicloud.com\/zh\/blog\/\",\"name\":\"Blog - Silicon Cloud\",\"description\":\"\",\"inLanguage\":\"zh-Hans\"},{\"@type\":\"Person\",\"@id\":\"https:\/\/www.silicloud.com\/zh\/blog\/#\/schema\/person\/f044a4b7fa4ee2701702942002419ca6\",\"name\":\"\u96c5, \u609f\",\"image\":{\"@type\":\"ImageObject\",\"inLanguage\":\"zh-Hans\",\"@id\":\"https:\/\/www.silicloud.com\/zh\/blog\/#\/schema\/person\/image\/\",\"url\":\"https:\/\/secure.gravatar.com\/avatar\/e71a913e914f1aad1efc391f92084294bac54bc782acd289638580134cf667a6?s=96&d=mm&r=g\",\"contentUrl\":\"https:\/\/secure.gravatar.com\/avatar\/e71a913e914f1aad1efc391f92084294bac54bc782acd289638580134cf667a6?s=96&d=mm&r=g\",\"caption\":\"\u96c5, \u609f\"},\"url\":\"https:\/\/www.silicloud.com\/zh\/blog\/author\/yawu\/\"},{\"@type\":\"ImageObject\",\"inLanguage\":\"zh-Hans\",\"@id\":\"https:\/\/www.silicloud.com\/zh\/blog\/%e4%bd%bf%e7%94%a8java%e4%b8%ad%e7%9a%84stream%e6%93%8d%e4%bd%9c\/#local-main-organization-logo\",\"url\":\"\",\"contentUrl\":\"\",\"caption\":\"Blog - Silicon Cloud\"}]}<\/script>\n<!-- \/ Yoast SEO Premium plugin. -->","yoast_head_json":{"title":"\u4f7f\u7528Java\u4e2d\u7684Stream\u64cd\u4f5c - Blog - Silicon Cloud","description":"\u5173\u4e8e\u4f7f\u7528Java\u4e2d\u7684Stream\u64cd\u4f5c\u7684\u6280\u672f\u6587\u7ae0","robots":{"index":"index","follow":"follow","max-snippet":"max-snippet:-1","max-image-preview":"max-image-preview:large","max-video-preview":"max-video-preview:-1"},"canonical":"https:\/\/www.silicloud.com\/zh\/blog\/\u4f7f\u7528java\u4e2d\u7684stream\u64cd\u4f5c\/","og_locale":"zh_CN","og_type":"article","og_title":"\u4f7f\u7528Java\u4e2d\u7684Stream\u64cd\u4f5c","og_description":"\u5173\u4e8e\u4f7f\u7528Java\u4e2d\u7684Stream\u64cd\u4f5c\u7684\u6280\u672f\u6587\u7ae0","og_url":"https:\/\/www.silicloud.com\/zh\/blog\/\u4f7f\u7528java\u4e2d\u7684stream\u64cd\u4f5c\/","og_site_name":"Blog - Silicon Cloud","article_published_time":"2022-12-27T01:23:38+00:00","article_modified_time":"2025-08-12T14:07:19+00:00","author":"\u96c5, \u609f","twitter_card":"summary_large_image","twitter_misc":{"\u4f5c\u8005":"\u96c5, \u609f","\u9884\u8ba1\u9605\u8bfb\u65f6\u95f4":"1 \u5206"},"schema":{"@context":"https:\/\/schema.org","@graph":[{"@type":"WebPage","@id":"https:\/\/www.silicloud.com\/zh\/blog\/%e4%bd%bf%e7%94%a8java%e4%b8%ad%e7%9a%84stream%e6%93%8d%e4%bd%9c\/","url":"https:\/\/www.silicloud.com\/zh\/blog\/%e4%bd%bf%e7%94%a8java%e4%b8%ad%e7%9a%84stream%e6%93%8d%e4%bd%9c\/","name":"\u4f7f\u7528Java\u4e2d\u7684Stream\u64cd\u4f5c - Blog - Silicon Cloud","isPartOf":{"@id":"https:\/\/www.silicloud.com\/zh\/blog\/#website"},"datePublished":"2022-12-27T01:23:38+00:00","dateModified":"2025-08-12T14:07:19+00:00","author":{"@id":"https:\/\/www.silicloud.com\/zh\/blog\/#\/schema\/person\/f044a4b7fa4ee2701702942002419ca6"},"description":"\u5173\u4e8e\u4f7f\u7528Java\u4e2d\u7684Stream\u64cd\u4f5c\u7684\u6280\u672f\u6587\u7ae0","breadcrumb":{"@id":"https:\/\/www.silicloud.com\/zh\/blog\/%e4%bd%bf%e7%94%a8java%e4%b8%ad%e7%9a%84stream%e6%93%8d%e4%bd%9c\/#breadcrumb"},"inLanguage":"zh-Hans","potentialAction":[{"@type":"ReadAction","target":["https:\/\/www.silicloud.com\/zh\/blog\/%e4%bd%bf%e7%94%a8java%e4%b8%ad%e7%9a%84stream%e6%93%8d%e4%bd%9c\/"]}]},{"@type":"BreadcrumbList","@id":"https:\/\/www.silicloud.com\/zh\/blog\/%e4%bd%bf%e7%94%a8java%e4%b8%ad%e7%9a%84stream%e6%93%8d%e4%bd%9c\/#breadcrumb","itemListElement":[{"@type":"ListItem","position":1,"name":"\u9996\u9875","item":"https:\/\/www.silicloud.com\/zh\/blog\/"},{"@type":"ListItem","position":2,"name":"\u4f7f\u7528Java\u4e2d\u7684Stream\u64cd\u4f5c"}]},{"@type":"WebSite","@id":"https:\/\/www.silicloud.com\/zh\/blog\/#website","url":"https:\/\/www.silicloud.com\/zh\/blog\/","name":"Blog - Silicon Cloud","description":"","inLanguage":"zh-Hans"},{"@type":"Person","@id":"https:\/\/www.silicloud.com\/zh\/blog\/#\/schema\/person\/f044a4b7fa4ee2701702942002419ca6","name":"\u96c5, \u609f","image":{"@type":"ImageObject","inLanguage":"zh-Hans","@id":"https:\/\/www.silicloud.com\/zh\/blog\/#\/schema\/person\/image\/","url":"https:\/\/secure.gravatar.com\/avatar\/e71a913e914f1aad1efc391f92084294bac54bc782acd289638580134cf667a6?s=96&d=mm&r=g","contentUrl":"https:\/\/secure.gravatar.com\/avatar\/e71a913e914f1aad1efc391f92084294bac54bc782acd289638580134cf667a6?s=96&d=mm&r=g","caption":"\u96c5, \u609f"},"url":"https:\/\/www.silicloud.com\/zh\/blog\/author\/yawu\/"},{"@type":"ImageObject","inLanguage":"zh-Hans","@id":"https:\/\/www.silicloud.com\/zh\/blog\/%e4%bd%bf%e7%94%a8java%e4%b8%ad%e7%9a%84stream%e6%93%8d%e4%bd%9c\/#local-main-organization-logo","url":"","contentUrl":"","caption":"Blog - Silicon Cloud"}]}},"_links":{"self":[{"href":"https:\/\/www.silicloud.com\/zh\/blog\/wp-json\/wp\/v2\/posts\/31061","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.silicloud.com\/zh\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.silicloud.com\/zh\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.silicloud.com\/zh\/blog\/wp-json\/wp\/v2\/users\/8"}],"replies":[{"embeddable":true,"href":"https:\/\/www.silicloud.com\/zh\/blog\/wp-json\/wp\/v2\/comments?post=31061"}],"version-history":[{"count":2,"href":"https:\/\/www.silicloud.com\/zh\/blog\/wp-json\/wp\/v2\/posts\/31061\/revisions"}],"predecessor-version":[{"id":111855,"href":"https:\/\/www.silicloud.com\/zh\/blog\/wp-json\/wp\/v2\/posts\/31061\/revisions\/111855"}],"wp:attachment":[{"href":"https:\/\/www.silicloud.com\/zh\/blog\/wp-json\/wp\/v2\/media?parent=31061"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.silicloud.com\/zh\/blog\/wp-json\/wp\/v2\/categories?post=31061"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.silicloud.com\/zh\/blog\/wp-json\/wp\/v2\/tags?post=31061"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}