{"id":31447,"date":"2023-10-17T01:30:53","date_gmt":"2023-03-10T02:02:06","guid":{"rendered":"https:\/\/www.silicloud.com\/zh\/blog\/java-%e6%83%b0%e6%80%a7%e8%af%84%e4%bc%b0\/"},"modified":"2024-05-04T04:37:31","modified_gmt":"2024-05-03T20:37:31","slug":"java-%e6%83%b0%e6%80%a7%e8%af%84%e4%bc%b0","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/zh\/blog\/java-%e6%83%b0%e6%80%a7%e8%af%84%e4%bc%b0\/","title":{"rendered":"Java \u60f0\u6027\u8bc4\u4f30"},"content":{"rendered":"

\u8fd9\u662f2021\u5e74Java\u65e5\u5386 | Advent Calendar\u7b2c16\u5929\u7684\u6587\u7ae0\u3002<\/p>\n

\u6211\u4f1a\u6c38\u8fdc\u9009\u62e9\u4e00\u4e2a\u61d2\u4eba\u6765\u505a\u4e00\u4e2a\u56f0\u96be\u7684\u5de5\u4f5c\uff0c\u56e0\u4e3a\u4ed6\u4f1a\u627e\u5230\u4e00\u4e2a\u7b80\u5355\u7684\u65b9\u6cd5\u6765\u5b8c\u6210\u5b83 – \u6bd4\u5c14\u00b7\u76d6\u8328<\/p>\n

\u203b \u56e0\u4e3a\u61d2\u60f0\u7684\u4eba\u80fd\u627e\u5230\u66f4\u7b80\u4fbf\u7684\u65b9\u5f0f\uff0c\u6240\u4ee5\u6211\u603b\u662f\u628a\u56f0\u96be\u7684\u5de5\u4f5c\u4ea4\u7ed9\u4ed6\u4eec\u3002- \u6bd4\u5c14\u00b7\u76d6\u8328<\/p>\n

\u603b\u7ed3<\/h1>\n

\u6211\u4eec\u6765\u770b\u4e00\u4e0b\u901a\u8fc7Stream API\u6267\u884cJava\u7684\u5ef6\u8fdf\u8bc4\u4f30\uff08lazy evaluation\uff09\u7684\u6027\u80fd\u3002<\/p>\n

\u5982\u540c\u4f7f\u7528Java Stream\u8fdb\u884c\u9a8c\u8bc1\u4e00\u6837\uff0c\u6211\u4eec\u5c06\u5c1d\u8bd5\u5904\u74061000\u4e2a\u4ee5\u4e0a\u7684\u5bf9\u8c61\u3002<\/p>\n

\u6211\u7684\u89c2\u611f\u662f\uff0c\u603b\u7684\u6765\u8bf4\uff0c\u7ed3\u679c\u8868\u660e\u4f7f\u7528 Stream API \u53ef\u4ee5\u4f7f\u5806\u5185\u5b58\u548c\u5904\u7406\u901f\u5ea6\u63d0\u5347\u5341\u500d\u4ee5\u4e0a\u3002<\/p>\n

\u5f53\u88ab\u79f0\u4e3aStream API\u7684fliter\uff08Predicate\uff09\u88ab\u8ba4\u4e3a\u4e0d\u5c5e\u4e8e\u5ef6\u8fdf\u8bc4\u4f30\u65f6…<\/div>\n

\u76f8\u6bd4\u8f83\u7684\u4ee3\u7801<\/h1>\n

\u4ee3\u7801\u662f\u4ece\u5305\u542b1000\u4e2a\uff08\uff0c1\u4e07\u4e2a\uff0c10\u4e07\u4e2a\uff09\u9002\u5f53\u5bf9\u8c61\u7684\u5217\u8868\u4e2d\u63d0\u53d6\u6ee1\u8db3\u67d0\u4e2a\u6761\u4ef6\uff08\u672c\u4f8b\u4e2d\u4e3a\u5e74\u9f84\u5927\u4e8e\u7b49\u4e8e30\u5c81\uff09\u7684\u4e1c\u897f\u3002<\/p>\n

\u5728Stream API\u7684\u60c5\u51b5\u4e0b<\/h2>\n
    void<\/span> useStream<\/span>()<\/span> {<\/span>\r\n        l<\/span>.<\/span>stream<\/span>().<\/span>filter<\/span>(<\/span>p<\/span> -><\/span> p<\/span>.<\/span>age<\/span> >=<\/span> 30<\/span>).<\/span>collect<\/span>(<\/span>Collectors<\/span>.<\/span>toList<\/span>());<\/span>\r\n    }<\/span>\r\n<\/code><\/pre>\n
\u5982\u679c\u5728 Stream API \u4e2d\u52a0\u4e0a parallel \u6807\u5fd7<\/h2>\n
    void<\/span> useStreamWithParallel<\/span>()<\/span> {<\/span>\r\n        l<\/span>.<\/span>stream<\/span>().<\/span>filter<\/span>(<\/span>p<\/span> -><\/span> p<\/span>.<\/span>age<\/span> >=<\/span> 30<\/span>).<\/span>parallel<\/span>().<\/span>collect<\/span>(<\/span>Collectors<\/span>.<\/span>toList<\/span>());<\/span>\r\n    }<\/span>\r\n<\/code><\/pre>\n
\u4f7f\u7528\u5217\u8868\u7684\u60c5\u51b5\u4e0b<\/h2>\n
    void<\/span> useList<\/span>()<\/span> {<\/span>\r\n        List<\/span><<\/span>Parson<\/span>><\/span> res<\/span> =<\/span> new<\/span> ArrayList<\/span><>();<\/span>\r\n        for<\/span> (<\/span>var<\/span> p<\/span> :<\/span> l<\/span>)<\/span> {<\/span>\r\n            if<\/span> (<\/span>p<\/span>.<\/span>age<\/span> <<\/span> 30<\/span>)<\/span> {<\/span>\r\n                continue<\/span>;<\/span>\r\n            }<\/span>\r\n            res<\/span>.<\/span>add<\/span>(<\/span>create<\/span>());<\/span>\r\n        }<\/span>\r\n    }<\/span>\r\n<\/code><\/pre>\n
\u6d4b\u91cf\u7ed3\u679c<\/h1>\n
\u5728\u6b64\u6b21\u6d4b\u8bd5\u4e2d\uff0c\u6211\u4eec\u4f7f\u7528\u4e86\u4e4b\u524d\u5728\u201cJava\u3067\u30d2\u30fc\u30d7\u30b5\u30a4\u30ba\u6e2c\u5b9a JUnit5\u7de8\u201d\u4e2d\u4ecb\u7ecd\u7684quickperf\u548c\u5728\u201cJava\u3067\u30d9\u30f3\u30c1\u30de\u30fc\u30af(\u6027\u80fd\u6e2c\u5b9a) JUnit5\u7de8\u201d\u4e2d\u4ecb\u7ecd\u7684jmh\u3002<\/p>\n
\u6211\u60f3\u63a8\u8350\u4f7f\u7528Stream API\u7684parallel\u529f\u80fd\uff0c\u4f46\u7531\u4e8e\u7ed3\u679c\u8fdf\u8fdf\u4e0d\u51fa\u6765\uff0c\u6240\u4ee5\u8fd9\u6b21\u6211\u8d2a\u5fc3\u5730\u8fdb\u884c\u4e861\u4e07\u6761\u548c10\u4e07\u6761\u7684\u9a8c\u8bc1\u3002
\n\u76f8\u6bd4\u6ca1\u6709parallel\u7684Stream API\uff0c\u5f97\u5206\u57281\u4e07\u6761\u65f6\u7a0d\u900a\u4e00\u7b79\uff0c\u4f46\u572810\u4e07\u6761\u65f6\u5374\u53cd\u8d85\u4e86\u3002<\/p>\n
JVM \u7684\u5806\u5927\u5c0f<\/h2>\n
\u4e00\u5343\u4ef6<\/h3>\n
[QUICK PERF] Measured heap allocation (test method thread): 21.44 Kilo bytes (21 952 bytes) \u2190 Stream API\r\n[QUICK PERF] Measured heap allocation (test method thread): 50.95 Kilo bytes (52 176 bytes) \u2190 Stream API (parallel)\r\n[QUICK PERF] Measured heap allocation (test method thread): 264.87 Kilo bytes (271 224 bytes) \u2190 List\r\n<\/code><\/pre>\n
\u4e00\u842c\u4ef6 (y\u012b<\/h3>\n
[QUICK PERF] Measured heap allocation (test method thread): 121.70 Kilo bytes (124 616 bytes) \u2190 Stream API\r\n[QUICK PERF] Measured heap allocation (test method thread): 160.49 Kilo bytes (164 344 bytes) \u2190 Stream API (parallel)\r\n[QUICK PERF] Measured heap allocation (test method thread): 2.45 Mega bytes (2 573 952 bytes) \u2190 List (\u5358\u4f4d\u304c\u9055\u3046)\r\n<\/code><\/pre>\n
\u4e00\u4e07\u4ef6<\/h3>\n
[QUICK PERF] Measured heap allocation (test method thread): 845.55 Kilo bytes (865 848 bytes) \u2190 Stream API\r\n[QUICK PERF] Measured heap allocation (test method thread): 823.67 Kilo bytes (843 440 bytes) \u2190 Stream API (parallel)\r\n[QUICK PERF] Measured heap allocation (test method thread): 24.67 Mega bytes (25 870 512 bytes) \u2190 List (\u5358\u4f4d\u304c\u9055\u3046)\r\n<\/code><\/pre>\n
\u57fa\u51c6\u6d4b\u8bd5<\/h2>\n
\u4e00\u5343\u4ef6<\/h3>\n
Benchmark                                        Mode  Cnt       Score      Error  Units\r\nStreamVsListLazyPerfTest.useList                thrpt    5    1171.093 \u00b1   22.063  ops\/s\r\nStreamVsListLazyPerfTest.useStream              thrpt    5  218394.756 \u00b1 4049.119  ops\/s\r\nStreamVsListLazyPerfTest.useStreamWithParallel  thrpt    5   68465.691 \u00b1 1838.747  ops\/s\r\n<\/code><\/pre>\n
\u4e00\u4e07\u4ef6<\/h3>\n
Benchmark                                        Mode  Cnt      Score      Error  Units\r\nStreamVsListLazyPerfTest.useList                thrpt    5    118.407 \u00b1    3.344  ops\/s\r\nStreamVsListLazyPerfTest.useStream              thrpt    5  21036.060 \u00b1  379.085  ops\/s\r\nStreamVsListLazyPerfTest.useStreamWithParallel  thrpt    5  18515.519 \u00b1 3244.870  ops\/s\r\n<\/code><\/pre>\n
10\u4e07\u4ef6<\/h3>\n
Benchmark                                        Mode  Cnt     Score    Error  Units\r\nStreamVsListLazyPerfTest.useList                thrpt    5    10.984 \u00b1  0.102  ops\/s\r\nStreamVsListLazyPerfTest.useStream              thrpt    5   813.617 \u00b1 86.894  ops\/s\r\nStreamVsListLazyPerfTest.useStreamWithParallel  thrpt    5  2140.738 \u00b1 79.030  ops\/s\r\n<\/code><\/pre>\n
\u8ffd\u52a0\u6587\u4ef6<\/h1>\n
\u7528\u4e8e\u5806\u6d4b\u91cf\u7684\u6d4b\u8bd5\u4ee3\u7801<\/h2>\n
@QuickPerfTest<\/span>\r\npublic<\/span> class<\/span> StreamVsListLazyTest<\/span> {<\/span>\r\n\r\n    List<\/span><<\/span>Parson<\/span>><\/span> l<\/span> =<\/span> new<\/span> ArrayList<\/span><>();<\/span>\r\n\r\n    @BeforeEach<\/span>\r\n    void<\/span> beforeAll<\/span>()<\/span> {<\/span>\r\n        for<\/span> (<\/span>int<\/span> i<\/span> =<\/span> 0<\/span>;<\/span> i<\/span> <<\/span> 10000<\/span>;<\/span> i<\/span>++)<\/span> {<\/span>\r\n            l<\/span>.<\/span>add<\/span>(<\/span>create<\/span>());<\/span>\r\n        }<\/span>\r\n    }<\/span>\r\n\r\n    @MeasureHeapAllocation<\/span>\r\n    @Test<\/span>\r\n    void<\/span> useStream<\/span>()<\/span> {<\/span>\r\n        l<\/span>.<\/span>stream<\/span>().<\/span>filter<\/span>(<\/span>p<\/span> -><\/span> p<\/span>.<\/span>age<\/span> >=<\/span> 30<\/span>).<\/span>collect<\/span>(<\/span>Collectors<\/span>.<\/span>toList<\/span>());<\/span>\r\n    }<\/span>\r\n\r\n    @MeasureHeapAllocation<\/span>\r\n    @Test<\/span>\r\n    void<\/span> useStreamWithParallel<\/span>()<\/span> {<\/span>\r\n        l<\/span>.<\/span>stream<\/span>().<\/span>filter<\/span>(<\/span>p<\/span> -><\/span> p<\/span>.<\/span>age<\/span> >=<\/span> 30<\/span>).<\/span>parallel<\/span>().<\/span>collect<\/span>(<\/span>Collectors<\/span>.<\/span>toList<\/span>());<\/span>\r\n    }<\/span>\r\n\r\n    @MeasureHeapAllocation<\/span>\r\n    @Test<\/span>\r\n    void<\/span> useList<\/span>()<\/span> {<\/span>\r\n        List<\/span><<\/span>Parson<\/span>><\/span> res<\/span> =<\/span> new<\/span> ArrayList<\/span><>();<\/span>\r\n        for<\/span> (<\/span>var<\/span> p<\/span> :<\/span> l<\/span>)<\/span> {<\/span>\r\n            if<\/span> (<\/span>p<\/span>.<\/span>age<\/span> <<\/span> 30<\/span>)<\/span> {<\/span>\r\n                continue<\/span>;<\/span>\r\n            }<\/span>\r\n            res<\/span>.<\/span>add<\/span>(<\/span>create<\/span>());<\/span>\r\n        }<\/span>\r\n    }<\/span>\r\n\r\n    @AllArgsConstructor<\/span>\r\n    @Data<\/span>\r\n    class<\/span> Parson<\/span> {<\/span>\r\n        private<\/span> String<\/span> name<\/span>;<\/span>\r\n        private<\/span> int<\/span> age<\/span>;<\/span>\r\n        private<\/span> String<\/span> addr<\/span>;<\/span>\r\n        private<\/span> String<\/span> addr2<\/span>;<\/span>\r\n    }<\/span>\r\n\r\n    Parson<\/span> create<\/span>()<\/span> {<\/span>\r\n        return<\/span> new<\/span> Parson<\/span>(<\/span>RandomStringUtils<\/span>.<\/span>randomAlphabetic<\/span>(<\/span>10<\/span>),<\/span> new<\/span> Random<\/span>().<\/span>nextInt<\/span>(<\/span>100<\/span>),<\/span> RandomStringUtils<\/span>.<\/span>randomAlphabetic<\/span>(<\/span>20<\/span>),<\/span> RandomStringUtils<\/span>.<\/span>randomAlphabetic<\/span>(<\/span>20<\/span>));<\/span>\r\n    }<\/span>\r\n\r\n}<\/span>\r\n<\/code><\/pre>\n
\u7528\u4e8e\u83b7\u53d6\u57fa\u51c6\u6d4b\u8bd5\u7684\u6d4b\u8bd5\u4ee3\u7801<\/h2>\n
@State<\/span>(<\/span>value<\/span> =<\/span> Scope<\/span>.<\/span>Benchmark<\/span>)<\/span>\r\npublic<\/span> class<\/span> StreamVsListLazyPerfTest<\/span> {<\/span>\r\n\r\n    List<\/span><<\/span>Parson<\/span>><\/span> l<\/span> =<\/span> new<\/span> ArrayList<\/span><>();<\/span>\r\n\r\n    @Setup<\/span>\r\n    public<\/span> void<\/span> setup<\/span>()<\/span> {<\/span>\r\n        for<\/span> (<\/span>int<\/span> i<\/span> =<\/span> 0<\/span>;<\/span> i<\/span> <<\/span> 10000<\/span>;<\/span> i<\/span>++)<\/span> {<\/span>\r\n            l<\/span>.<\/span>add<\/span>(<\/span>create<\/span>());<\/span>\r\n        }<\/span>\r\n    }<\/span>\r\n\r\n    @Benchmark<\/span>\r\n    public<\/span> void<\/span> useStream<\/span>()<\/span> {<\/span>\r\n        l<\/span>.<\/span>stream<\/span>().<\/span>filter<\/span>(<\/span>p<\/span> -><\/span> p<\/span>.<\/span>age<\/span> >=<\/span> 30<\/span>).<\/span>collect<\/span>(<\/span>Collectors<\/span>.<\/span>toList<\/span>());<\/span>\r\n    }<\/span>\r\n\r\n    @Benchmark<\/span>\r\n    public<\/span> void<\/span> useStreamWithParallel<\/span>()<\/span> {<\/span>\r\n        l<\/span>.<\/span>stream<\/span>().<\/span>filter<\/span>(<\/span>p<\/span> -><\/span> p<\/span>.<\/span>age<\/span> >=<\/span> 30<\/span>).<\/span>parallel<\/span>().<\/span>collect<\/span>(<\/span>Collectors<\/span>.<\/span>toList<\/span>());<\/span>\r\n    }<\/span>\r\n\r\n    @Benchmark<\/span>\r\n    public<\/span> void<\/span> useList<\/span>()<\/span> {<\/span>\r\n        List<\/span><<\/span>Parson<\/span>><\/span> res<\/span> =<\/span> new<\/span> ArrayList<\/span><>();<\/span>\r\n        for<\/span> (<\/span>var<\/span> p<\/span> :<\/span> l<\/span>)<\/span> {<\/span>\r\n            if<\/span> (<\/span>p<\/span>.<\/span>age<\/span> <<\/span> 30<\/span>)<\/span> {<\/span>\r\n                continue<\/span>;<\/span>\r\n            }<\/span>\r\n            res<\/span>.<\/span>add<\/span>(<\/span>create<\/span>());<\/span>\r\n        }<\/span>\r\n    }<\/span>\r\n\r\n    \/\/ Junit \u306e\u30c6\u30b9\u30c8\u30a2\u30ce\u30c6\u30fc\u30b7\u30e7\u30f3\u3067 Runner \u3092\u8a2d\u5b9a\u3059\u308b<\/span>\r\n    @Test<\/span>\r\n    void<\/span> benchMark<\/span>()<\/span> throws<\/span> RunnerException<\/span> {<\/span>\r\n        Options<\/span> opt<\/span> =<\/span> new<\/span> OptionsBuilder<\/span>()<\/span>\r\n                .<\/span>include<\/span>(<\/span>StreamVsListLazyPerfTest<\/span>.<\/span>class<\/span>.<\/span>getSimpleName<\/span>())<\/span>\r\n                .<\/span>forks<\/span>(<\/span>1<\/span>)<\/span> \/\/ 1\u56de\u5b9f\u884c<\/span>\r\n                .<\/span>warmupIterations<\/span>(<\/span>1<\/span>)<\/span> \/\/ 1\u56de\u7e70\u308a\u8fd4\u3057<\/span>\r\n                .<\/span>build<\/span>();<\/span>\r\n        new<\/span> Runner<\/span>(<\/span>opt<\/span>).<\/span>run<\/span>();<\/span>\r\n    }<\/span>\r\n\r\n    @AllArgsConstructor<\/span>\r\n    @Data<\/span>\r\n    class<\/span> Parson<\/span> {<\/span>\r\n        private<\/span> String<\/span> name<\/span>;<\/span>\r\n        private<\/span> int<\/span> age<\/span>;<\/span>\r\n        private<\/span> String<\/span> addr<\/span>;<\/span>\r\n        private<\/span> String<\/span> addr2<\/span>;<\/span>\r\n    }<\/span>\r\n\r\n    Parson<\/span> create<\/span>()<\/span> {<\/span>\r\n        return<\/span> new<\/span> Parson<\/span>(<\/span>RandomStringUtils<\/span>.<\/span>randomAlphabetic<\/span>(<\/span>10<\/span>),<\/span> new<\/span> Random<\/span>().<\/span>nextInt<\/span>(<\/span>100<\/span>),<\/span> RandomStringUtils<\/span>.<\/span>randomAlphabetic<\/span>(<\/span>20<\/span>),<\/span> RandomStringUtils<\/span>.<\/span>randomAlphabetic<\/span>(<\/span>20<\/span>));<\/span>\r\n    }<\/span>\r\n\r\n}<\/span>\r\n<\/code><\/pre>\n","protected":false},"excerpt":{"rendered":"
\u8fd9\u662f2021\u5e74Java\u65e5\u5386 | Advent Calendar\u7b2c16\u5929\u7684\u6587\u7ae0\u3002 \u6211\u4f1a\u6c38\u8fdc\u9009\u62e9\u4e00\u4e2a\u61d2\u4eba\u6765\u505a\u4e00\u4e2a\u56f0 […]<\/p>\n","protected":false},"author":12,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-31447","post","type-post","status-publish","format-standard","hentry","category-uncategorized"],"yoast_head":"\nJava \u60f0\u6027\u8bc4\u4f30 - 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-\u60f0\u6027\u8bc4\u4f30\/\" \/>\n<meta property=\"og:locale\" content=\"zh_CN\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Java \u60f0\u6027\u8bc4\u4f30\" \/>\n<meta property=\"og:description\" content=\"\u8fd9\u662f2021\u5e74Java\u65e5\u5386 | Advent Calendar\u7b2c16\u5929\u7684\u6587\u7ae0\u3002 \u6211\u4f1a\u6c38\u8fdc\u9009\u62e9\u4e00\u4e2a\u61d2\u4eba\u6765\u505a\u4e00\u4e2a\u56f0 […]\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.silicloud.com\/zh\/blog\/java-\u60f0\u6027\u8bc4\u4f30\/\" \/>\n<meta property=\"og:site_name\" content=\"Blog - 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