{"id":31064,"date":"2023-03-31T12:55:49","date_gmt":"2023-08-12T13:14:57","guid":{"rendered":"https:\/\/www.silicloud.com\/zh\/blog\/%e5%85%b3%e4%ba%8ejava%e7%9a%84stream-api\/"},"modified":"2025-08-12T22:08:24","modified_gmt":"2025-08-12T14:08:24","slug":"%e5%85%b3%e4%ba%8ejava%e7%9a%84stream-api","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/zh\/blog\/%e5%85%b3%e4%ba%8ejava%e7%9a%84stream-api\/","title":{"rendered":"\u5173\u4e8eJava\u7684Stream API"},"content":{"rendered":"

\u9996\u5148\u8fd9\u662f\u4e00\u7bc7\u9762\u5411StreamAPI\u521d\u5b66\u8005\u7684\u6587\u7ae0\u3002
\n\u8be5\u6587\u7ae0\u4e0d\u6d89\u53caStreamAPI\u4e2d\u4f7f\u7528\u7684Lambda\u8868\u8fbe\u5f0f\u3002\uff08\u8bf7\u53c2\u8003\u8fd9\u7bc7\u6587\u7ae0\uff09<\/p>\n

StreamAPI\u662f\u4ec0\u9ebcStreamAPI\u662f\u4eceJava SE8\u5f00\u59cb\u6dfb\u52a0\u7684\u4e00\u79cd\u529f\u80fd\uff0c\u53ef\u4ee5\u5f88\u597d\u5730\u5904\u7406\u96c6\u5408\u7684\u64cd\u4f5c\u3002\u57fa\u672c\u4e0a\uff0c\u5b83\u9075\u5faa\u4ee5\u4e0b\u6b65\u9aa4\u8fdb\u884c\u5904\u7406\u3002<\/p>\n
    \n
  1. \n
      \u83b7\u53d6Stream<\/ol>\n<\/li>\n<\/ol>\n

       <\/p>\n

        \n
      1. \n
          \u6267\u884c\u4e2d\u95f4\u64cd\u4f5c\u5bf9Stream\u7684\u5143\u7d20\u8fdb\u884c\u64cd\u4f5c<\/ol>\n<\/li>\n<\/ol>\n

           <\/p>\n

            \u6267\u884c\u7ec8\u7aef\u64cd\u4f5c\u83b7\u53d6\u7ed3\u679c<\/ol>\n

            \u76f8\u5173\u7684\u7c7b\u88ab\u6574\u7406\u5728java.util.stream\u5305\u4e2d\u3002<\/p>\n

            \u4f7f\u7528\u65b9\u6cd5<\/p>\n

            \u6d41\u5a92\u4f53\u7684\u7c7b\u522b\u4e3b\u8981\u7684Stream\u5bf9\u8c61\u5305\u62ec\u4ee5\u4e0b\u5185\u5bb9\u3002
            \n\u901a\u5e38\u7684Stream\u53ea\u80fd\u5904\u7406\u5f15\u7528\u7c7b\u578b\u7684\u503c\uff0c\u56e0\u6b64\u8fd8\u4e13\u95e8\u63d0\u4f9b\u4e86\u5904\u7406\u539f\u59cb\u7c7b\u578b\u7684Stream\u3002<\/p>\n
            \n
            Stream\u6271\u3046\u578bStream\u53c2\u7167\u578bIntStreamint\u578bLongStreamlong\u578bDoubleStreamdouble\u578b<\/p>\n

            \u83b7\u53d6\u6d41\u7684\u65b9\u6cd5\u53ef\u4ee5\u901a\u8fc7\u4ee5\u4e0b\u6a21\u5f0f\u83b7\u5f97Stream\u3002<\/p>\n
            \/\/ List\u304b\u3089Stream\u3092\u53d6\u5f97<\/span>\r\nList<\/span><<\/span>String<\/span>><\/span> list<\/span> =<\/span> List<\/span>.<\/span>of<\/span>(<\/span>\"twitter\"<\/span>,<\/span> \"instagram\"<\/span>,<\/span> \"facebook\"<\/span>);<\/span>\r\nStream<\/span><<\/span>String<\/span>><\/span> stream<\/span> =<\/span> list<\/span>.<\/span>stream<\/span>();<\/span>\r\n\r\n\/\/ \u914d\u5217\u304b\u3089Stream\u3092\u53d6\u5f97<\/span>\r\nString<\/span>[]<\/span> strArraly<\/span> =<\/span> {<\/span>\"twitter\"<\/span>,<\/span> \"instagram\"<\/span>,<\/span> \"facebook\"<\/span>};<\/span>\r\nStream<\/span><<\/span>String<\/span>><\/span> stream<\/span> =<\/span> Stream<\/span>.<\/span>of<\/span>(<\/span>strArraly<\/span>);<\/span>\r\n\r\n\/\/ \u30d7\u30ea\u30df\u30c6\u30a3\u30d6\u578b\u3092\u6271\u3046Stream\u3092\u53d6\u5f97<\/span>\r\nIntStream<\/span> stream<\/span> =<\/span> IntStream<\/span>.<\/span>of<\/span>({<\/span>1<\/span>,<\/span> 2<\/span>,<\/span> 3<\/span>,<\/span> 4<\/span>,<\/span> 5<\/span>});<\/span>\r\n\r\n\/\/ Stream.of()\u3060\u3068Integer\u578b\u3092\u6271\u3046Stream\u304c\u53d6\u5f97\u3055\u308c\u308b<\/span>\r\nStream<\/span><<\/span>Integer<\/span>><\/span> stream<\/span> =<\/span> Stream<\/span>.<\/span>of<\/span>({<\/span>1<\/span>,<\/span> 2<\/span>,<\/span> 3<\/span>,<\/span> 4<\/span>,<\/span> 5<\/span>});<\/span>\r\n\r\n\/\/ \u8981\u7d20\u6570\u304c\u7121\u9650<\/span>\r\nStream<\/span><<\/span>Integer<\/span>><\/span> stream<\/span> =<\/span> Stream<\/span>.<\/span>generate<\/span>(()<\/span> -><\/span> new<\/span> Random<\/span>().<\/span>nextInt<\/span>());<\/span>\r\n<\/code><\/pre>\n
            \u5bf9\u4e8e”\u4e2d\u9593\u64cd\u4f5c”\uff0c\u53ea\u9700\u8981\u4e00\u4e2a\u4e2d\u6587\u7ffb\u8bd1\u9009\u9879\uff1a\u5bf9Stream\u4e2d\u7684\u5143\u7d20\u8fdb\u884c\u64cd\u4f5c\u5e76\u8fd4\u56de\u4e00\u4e2a\u65b0\u7684Stream\u7684\u64cd\u4f5c\u3002
            \n\u53ef\u4ee5\u901a\u8fc7\u4f7f\u7528\u65b9\u6cd5\u94fe\u5c06\u8fd4\u56de\u65b0\u7684Stream\uff0c\u6765\u8fdb\u884c\u63cf\u8ff0\u3002<\/p>\n
            \u4e2d\u95f4\u64cd\u4f5c\u5217\u8868\uff08\u90e8\u5206\uff09<\/p>\n
            \n
            \u30e1\u30bd\u30c3\u30c9\u5185\u5bb9\u5f15\u6570filter\u6761\u4ef6\u306b\u4e00\u81f4\u3059\u308b\u8981\u7d20\u306e\u307f\u306eStream\u3092\u8fd4\u3059Predicatemap\u5225\u306e\u578b\u3092\u6271\u3046Stream\u3092\u8fd4\u3059FunctionmapToIntintStream\u3092\u8fd4\u3059Functiondistinct\u8981\u7d20\u306e\u91cd\u8907\u3092\u6392\u9664\u3057\u305fStream\u3092\u8fd4\u3059
            \n\u203bequals\u30e1\u30bd\u30c3\u30c9\u3067true\u3092\u8fd4\u3059\u3082\u306e\u306a\u3057limit\u6307\u5b9a\u3055\u308c\u305f\u8981\u7d20\u6570\u306eStream\u3092\u8fd4\u3059intskip\u6307\u5b9a\u3055\u308c\u305f\u6570\u5206\u306e\u8981\u7d20\u3092\u98db\u3070\u3057\u305fStream\u3092\u8fd4\u3059intsorted\u5f15\u6570\u3067\u6307\u5b9a\u3057\u305f\u9806\u5e8f\u306b\u5f93\u3063\u3066\u30bd\u30fc\u30c8\u3055\u308c\u305fStream\u3092\u8fd4\u3059
            \n\u203b\u5f15\u6570\u306a\u3057\u306e\u5834\u5408\u306f\u81ea\u7136\u9806\u5e8f\u306b\u5f93\u3046Comparatorpeek\u73fe\u5728\u306e\u8981\u7d20\u306b\u5bfe\u3057\u3066\u95a2\u6570\u3092\u9069\u7528\u3057\u3001Stream\u3092\u8fd4\u3059Consumer
            \n\u4f7f\u7528\u793a\u4f8b<\/p>\n
            \/\/ t\u3092\u542b\u3080\u8981\u7d20\u306e\u307f\u3092\u6271\u3046Stream\u306b\u5909\u63db<\/span>\r\nStream<\/span><<\/span>String<\/span>><\/span> stream<\/span> =<\/span> List<\/span>.<\/span>of<\/span>(<\/span>\"twitter\"<\/span>,<\/span> \"instagram\"<\/span>,<\/span> \"facebook\"<\/span>).<\/span>stream<\/span>().<\/span>filter<\/span>(<\/span>str<\/span> -><\/span> str<\/span>.<\/span>contains<\/span>(<\/span>\"t\"<\/span>));<\/span> \r\n\/\/ \"twitter\", \"instagram\" \u3092\u6271\u3046Stream<String>\u3092\u8fd4\u3059<\/span>\r\n\r\n\/\/ \u6587\u5b57\u5217\u306e\u6587\u5b57\u6570\u3092\u6271\u3046Stream\u306b\u5909\u63db<\/span>\r\nStream<\/span><<\/span>Integer<\/span>><\/span> stream<\/span> =<\/span> List<\/span>.<\/span>of<\/span>(<\/span>\"twitter\"<\/span>,<\/span> \"instagram\"<\/span>,<\/span> \"facebook\"<\/span>).<\/span>stream<\/span>().<\/span>map<\/span>(<\/span>str<\/span> -><\/span> str<\/span>.<\/span>length<\/span>());<\/span>\r\n\/\/ 7, 9, 8\u3092\u6271\u3046Stream<Integer>\u3092\u8fd4\u3059<\/span>\r\n\r\n\/\/ IntStream\u578b\u306eStream\u306b\u5909\u63db<\/span>\r\nIntStream<\/span> stream<\/span> =<\/span> List<\/span>.<\/span>of<\/span>(<\/span>\"twitter\"<\/span>,<\/span> \"instagram\"<\/span>,<\/span> \"facebook\"<\/span>).<\/span>stream<\/span>().<\/span>mapToInt<\/span>(<\/span>str<\/span> -><\/span> str<\/span>.<\/span>length<\/span>());<\/span>\r\n\/\/ 7, 9, 8\u3092\u6271\u3046IntStream\u3092\u8fd4\u3059<\/span>\r\n\r\n\/\/ \u91cd\u8907\u3092\u6392\u9664<\/span>\r\nStream<\/span><<\/span>String<\/span>><\/span> stream<\/span> =<\/span> List<\/span>.<\/span>of<\/span>(<\/span>\"twitter\"<\/span>,<\/span> \"instagram\"<\/span>,<\/span> \"facebook\"<\/span>,<\/span> \"twitter\"<\/span>).<\/span>stream<\/span>().<\/span>distinct<\/span>();<\/span>\r\n\/\/ \"twitter\", \"instagram\", \"facebook\"\u3092\u6271\u3046Stream<String>\u3092\u8fd4\u3059<\/span>\r\n\r\n\/\/ \u8981\u7d20\u6570\u3092\u9650\u5b9a\u3059\u308b<\/span>\r\nStream<\/span><<\/span>String<\/span>><\/span> stream<\/span> =<\/span> Stream<\/span>.<\/span>generate<\/span>(()<\/span> -><\/span> new<\/span> Random<\/span>().<\/span>nextInt<\/span>()).<\/span>limit<\/span>(<\/span>5<\/span>);<\/span>\r\n\/\/ 5\u3064\u306e\u4e71\u6570\u3092\u6271\u3046Stream<Integer>\u3092\u8fd4\u3059<\/span>\r\n\r\n\/\/ \u6700\u521d\u306e\u8981\u7d20\u3092\u6307\u5b9a\u5206\u30b9\u30ad\u30c3\u30d7\u3059\u308b<\/span>\r\nStream<\/span><<\/span>String<\/span>><\/span> stream<\/span> =<\/span> List<\/span>.<\/span>of<\/span>(<\/span>\"twitter\"<\/span>,<\/span> \"instagram\"<\/span>,<\/span> \"facebook\"<\/span>).<\/span>stream<\/span>().<\/span>skip<\/span>(<\/span>1<\/span>);<\/span>\r\n\/\/ \"instagram\", \"facebook\"\u3092\u6271\u3046Stream<String>\u3092\u8fd4\u3059<\/span>\r\n\r\n\/\/ \u8981\u7d20\u306e\u9806\u756a\u3092\u4e26\u3073\u66ff\u3048\u308b<\/span>\r\nStream<\/span><<\/span>String<\/span>><\/span> stream<\/span> =<\/span> List<\/span>.<\/span>of<\/span>(<\/span>\"twitter\"<\/span>,<\/span> \"instagram\"<\/span>,<\/span> \"facebook\"<\/span>).<\/span>stream<\/span>().<\/span>sorted<\/span>();<\/span>\r\n\/\/ \"facebook\", \"instagram\", \"twitter\"\u3092\u6271\u3046Stream<String>\u3092\u8fd4\u3059<\/span>\r\n\r\n\/\/ \u8981\u7d20\u306e\u72b6\u614b\u3092\u8868\u793a\u3059\u308b<\/span>\r\nStream<\/span><<\/span>String<\/span>><\/span> stream<\/span> =<\/span> List<\/span>.<\/span>of<\/span>(<\/span>\"twitter\"<\/span>,<\/span> \"instagram\"<\/span>,<\/span> \"facebook\"<\/span>).<\/span>stream<\/span>().<\/span>peek<\/span>(<\/span>str<\/span> -><\/span> System<\/span>.<\/span>out<\/span>.<\/span>print<\/span>(<\/span>str<\/span> +<\/span> \" \"<\/span>));<\/span>\r\n\/\/ \u30b3\u30f3\u30bd\u30fc\u30eb\u306b twitter instagram facebook\u3068\u8868\u793a\u3057\u3001\"twitter\", \"instagram\", \"facebook\"\u3092\u6271\u3046Stream<String>\u3092\u8fd4\u3059<\/span>\r\n\r\n\/\/ \u30e1\u30bd\u30c3\u30c9\u30c1\u30a7\u30fc\u30f3<\/span>\r\nList<\/span>.<\/span>of<\/span>(<\/span>\"twitter\"<\/span>,<\/span> \"instagram\"<\/span>,<\/span> \"facebook\"<\/span>).<\/span>stream<\/span>().<\/span>map<\/span>(<\/span>str<\/span> -><\/span> str<\/span>.<\/span>length<\/span>()).<\/span>filter<\/span>(<\/span>len<\/span> -><\/span> len<\/span> ><\/span> 7<\/span>);<\/span>\r\n\/\/ 7, 9, 8\u3092\u6271\u3046Stream<Integer>\u306b\u5909\u63db\u3057\u30019, 8\u3092\u6271\u3046Stream<Integer>\u3092\u8fd4\u3059<\/span>\r\n<\/code><\/pre>\n
            \u7ec8\u7aef\u64cd\u4f5c
            \n\u8fd9\u662f\u7528\u4e8e\u6700\u7ec8\u5904\u7406Stream\u5bf9\u8c61\u7684\u64cd\u4f5c\u3002
            \n\u6bcf\u4e2aStream\u5bf9\u8c61\u53ea\u80fd\u8c03\u7528\u4e00\u6b21\u3002<\/p>\n
            \u4ee5\u4e0b\u7684\u793a\u4f8b\u5c06\u5728\u8fd0\u884c\u65f6\u5f15\u53d1\u5f02\u5e38\u3002<\/p>\n
            Stream<\/span><<\/span>String<\/span>><\/span> stream<\/span> =<\/span> List<\/span>.<\/span>of<\/span>(<\/span>\"twitter\"<\/span>,<\/span> \"instagram\"<\/span>,<\/span> \"facebook\"<\/span>).<\/span>stream<\/span>();<\/span>\r\nstream<\/span>.<\/span>forEach<\/span>(<\/span>str<\/span> -><\/span> System<\/span>.<\/span>out<\/span>.<\/span>println<\/span>(<\/span>str<\/span>));<\/span>\r\nstream<\/span>.<\/span>forEach<\/span>(<\/span>str<\/span> -><\/span> System<\/span>.<\/span>out<\/span>.<\/span>println<\/span>(<\/span>str<\/span>));<\/span> \/\/ IllegalStateException\u304c\u30b9\u30ed\u30fc\u3055\u308c\u308b<\/span>\r\n<\/code><\/pre>\n
            \u7ec8\u7aef\u64cd\u4f5c\u6982\u89c8<\/p>\n
            \n
            \u30e1\u30bd\u30c3\u30c9\u5185\u5bb9\u5f15\u6570\u623b\u308a\u5024forEachStream\u306e\u8981\u7d20\u4e00\u3064\u4e00\u3064\u306b\u51e6\u7406\u3092\u884c\u3046ConsumervoidcountStream\u306e\u8981\u7d20\u6570\u3092\u8fd4\u3059\u306a\u3057intcollectStream\u306e\u8981\u7d20\u3092\u6301\u3064\u30b3\u30ec\u30af\u30b7\u30e7\u30f3\u3092\u8fd4\u3059Collector
            \nSupplier, BiConsumer, BiConsumerCollector\u3067\u6307\u5b9a\u3057\u305f\u578breduceStream\u306e\u8981\u7d20\u3092\u7d50\u5408\u3057\u3066\u8fd4\u3059BinaryOparator
            \nT\uff08\u521d\u671f\u5024\uff09, BinaryOperatorOptional<T>
            \nT
            \n\u8bf7\u53c2\u8003Java Stream\u4e2d\u7684Collectors\u7684\u6ce8\u91ca\uff0c\u56e0\u4e3acollect\u65b9\u6cd5\u7684\u53c2\u6570Collector\u5f88\u6df1\u5965\u3002<\/p>\n
            \/\/ stream\u8981\u7d20<\/span>\r\nStream<\/span><<\/span>String<\/span>><\/span> stream<\/span> =<\/span> List<\/span>.<\/span>of<\/span>(<\/span>\"twitter\"<\/span>,<\/span> \"instagram\"<\/span>,<\/span> \"facebook\"<\/span>,<\/span> \"twitter\"<\/span>).<\/span>stream<\/span>();<\/span>\r\n\r\n\/\/ \u8981\u7d20\u30921\u3064\u305a\u3064\u30b3\u30f3\u30bd\u30fc\u30eb\u306b\u51fa\u529b<\/span>\r\nstream<\/span>.<\/span>forEach<\/span>(<\/span>str<\/span> -><\/span> System<\/span>.<\/span>out<\/span>.<\/span>println<\/span>(<\/span>str<\/span>));<\/span>\r\n\r\n\/\/ \u8981\u7d20\u306e\u500b\u6570\u3092\u53d6\u5f97<\/span>\r\nlong<\/span> count<\/span> =<\/span> stream<\/span>.<\/span>count<\/span>();<\/span>\r\n\r\n\/\/ \u8981\u7d20\u3092\u30ea\u30b9\u30c8\u306b\u3057\u3066\u53d6\u5f97\uff08Collectors\u3092\u4f7f\u7528\u3059\u308b\uff09<\/span>\r\nList<\/span><<\/span>String<\/span>><\/span> list<\/span>  =<\/span> stream<\/span>.<\/span>map<\/span>(<\/span>str<\/span> -><\/span> str<\/span>.<\/span>toUpperCase<\/span>()).<\/span>collect<\/span>(<\/span>Collectors<\/span>.<\/span>toList<\/span>());<\/span>\r\n\r\n\/\/ \u8981\u7d20\u3092\u30ea\u30b9\u30c8\u306b\u3057\u3066\u53d6\u5f97(\u95a2\u6570\u578b\u30a4\u30f3\u30bf\u30d5\u30a7\u30fc\u30b9\u3092\u4f7f\u7528\u3059\u308b\u3002\u2191\u3068\u540c\u3058)<\/span>\r\nList<\/span><<\/span>String<\/span>><\/span> list<\/span> =<\/span> stream<\/span>.<\/span>collect<\/span>(()<\/span> -><\/span> new<\/span> ArrayList<\/span><>(),<\/span> \r\n    (<\/span>List<\/span><<\/span>String<\/span>><\/span> list<\/span>,<\/span> String<\/span> str<\/span>)<\/span> -><\/span> list<\/span>.<\/span>add<\/span>(<\/span>str<\/span>),<\/span>\r\n    (<\/span>List<\/span><<\/span>String<\/span>><\/span> left<\/span>,<\/span> List<\/span><<\/span>String<\/span>><\/span> right<\/span>)<\/span> -><\/span> left<\/span>.<\/span>addAll<\/span>(<\/span>right<\/span>)<\/span>\r\n);<\/span>\r\n\r\n\/\/ \u8981\u7d20\u306e\u6587\u5b57\u6570\u3092\u5408\u8a08\u3057\u3066\u53d6\u5f97<\/span>\r\nInteger<\/span> length<\/span> =<\/span> stream<\/span>.<\/span>map<\/span>(<\/span>str<\/span> -><\/span> str<\/span>.<\/span>length<\/span>()).<\/span>reduce<\/span>(<\/span>0<\/span>,<\/span> (<\/span>a<\/span>,<\/span> b<\/span>)<\/span> -><\/span> a<\/span> +<\/span> b<\/span>);<\/span>\r\n\r\n\/\/ \u521d\u671f\u5024\u3092\u6307\u5b9a\u3057\u306a\u304b\u3063\u305f\u5834\u5408\u306fOptional\u304c\u8fd4\u3055\u308c\u308b<\/span>\r\nOptional<\/span><<\/span>Integer<\/span>><\/span> length<\/span> =<\/span> stream<\/span>.<\/span>map<\/span>(<\/span>str<\/span> -><\/span> str<\/span>.<\/span>length<\/span>()).<\/span>reduce<\/span>((<\/span>a<\/span>,<\/span> b<\/span>)<\/span> -><\/span> a<\/span> +<\/span> b<\/span>);<\/span>\r\n<\/code><\/pre>\n","protected":false},"excerpt":{"rendered":"
            \u9996\u5148\u8fd9\u662f\u4e00\u7bc7\u9762\u5411StreamAPI\u521d\u5b66\u8005\u7684\u6587\u7ae0\u3002 \u8be5\u6587\u7ae0\u4e0d\u6d89\u53caStreamAPI\u4e2d\u4f7f\u7528\u7684Lambda\u8868\u8fbe\u5f0f\u3002\uff08 […]<\/p>\n","protected":false},"author":12,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[227],"class_list":["post-31064","post","type-post","status-publish","format-standard","hentry","category-uncategorized","tag-227"],"yoast_head":"\n\u5173\u4e8eJava\u7684Stream API - Blog - Silicon Cloud<\/title>\n<meta name=\"description\" content=\"\u5173\u4e8e\u5173\u4e8eJava\u7684Stream API\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\/\u5173\u4e8ejava\u7684stream-api\/\" \/>\n<meta property=\"og:locale\" content=\"zh_CN\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"\u5173\u4e8eJava\u7684Stream API\" \/>\n<meta property=\"og:description\" content=\"\u5173\u4e8e\u5173\u4e8eJava\u7684Stream API\u7684\u6280\u672f\u6587\u7ae0\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.silicloud.com\/zh\/blog\/\u5173\u4e8ejava\u7684stream-api\/\" \/>\n<meta property=\"og:site_name\" content=\"Blog - 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