{"id":1561,"date":"2026-06-10T08:37:32","date_gmt":"2026-06-10T00:37:32","guid":{"rendered":"https:\/\/yunyanglib.cn\/?p=1561"},"modified":"2026-06-10T08:37:34","modified_gmt":"2026-06-10T00:37:34","slug":"%e3%80%90java%e3%80%91%e6%b7%b1%e5%85%a5%e6%b5%85%e5%87%ba-lambda-%e8%a1%a8%e8%be%be%e5%bc%8f%ef%bc%8c%e4%bb%8e%e5%85%a5%e9%97%a8%e5%88%b0%e5%ae%9e%e6%93%8d","status":"publish","type":"post","link":"https:\/\/yunyanglib.cn\/?p=1561","title":{"rendered":"\u3010Java\u3011\u6df1\u5165\u6d45\u51fa Lambda \u8868\u8fbe\u5f0f\uff0c\u4ece\u5165\u95e8\u5230\u5b9e\u64cd"},"content":{"rendered":"\n

\u54c8\u55bd\u5404\u4f4d\u5c0f\u4f19\u4f34\uff0c\u8fd1\u671f\u4e00\u76f4\u5728\u68b3\u7406 Java8 \u6838\u5fc3\u65b0\u7279\u6027\u5185\u5bb9\uff0c\u4eca\u5929\u5c31\u6765\u8be6\u7ec6\u804a\u804a Java8 \u6807\u5fd7\u6027\u8bed\u6cd5 \u2014\u2014Lambda \u8868\u8fbe\u5f0f<\/strong>\u3002Lambda \u662f\u51fd\u6570\u5f0f\u7f16\u7a0b\u843d\u5730 Java \u7684\u5173\u952e\uff0c\u7528\u597d\u5b83\u80fd\u5927\u5e45\u7cbe\u7b80\u5197\u4f59\u4ee3\u7801\uff0c\u5c24\u5176\u662f\u5728\u63a5\u53e3\u56de\u8c03\u3001\u96c6\u5408\u904d\u5386\u3001\u591a\u7ebf\u7a0b\u573a\u666f\u4e2d\u63d0\u5347\u7f16\u7801\u6548\u7387\u3002<\/p>\n\n\n\n

\u4e00\u3001\u521d\u8bc6 Lambda \u8868\u8fbe\u5f0f<\/h2>\n\n\n\n

Lambda \u662f Java8 \u65b0\u589e\u7684\u533f\u540d\u65b9\u6cd5\u8bed\u6cd5\uff0c\u6838\u5fc3\u4f5c\u7528\uff1a\u628a\u4e00\u6bb5\u4ee3\u7801\u5757\u5f53\u4f5c\u65b9\u6cd5\u53c2\u6570\u8fdb\u884c\u4f20\u9012\uff0c\u5ef6\u8fdf\u6267\u884c\u903b\u8f91<\/strong>\uff0c\u6446\u8131\u4f20\u7edf\u533f\u540d\u5185\u90e8\u7c7b\u7e41\u7410\u7684\u683c\u5f0f\u4e66\u5199\u3002<\/p>\n\n\n\n

\u57fa\u7840\u8bed\u6cd5\u683c\u5f0f<\/h3>\n\n\n\n
(\u53c2\u6570\u5217\u8868) -> \u65b9\u6cd5\u4f53\n<\/code><\/pre>\n\n\n\n
    \n
  • ()<\/code>\uff1a\u5b58\u653e\u65b9\u6cd5\u5165\u53c2\uff0c\u65e0\u53c2\u6570\u65f6\u7a7a\u62ec\u53f7\uff1b\u5355\u4e2a\u53c2\u6570\u53ef\u7701\u7565\u62ec\u53f7<\/li>\n\n\n\n
  • -><\/code>\uff1aLambda \u4e13\u5c5e\u7bad\u5934\u6807\u8bc6\u7b26\uff0c\u5206\u5272\u53c2\u6570\u548c\u65b9\u6cd5\u4f53<\/li>\n\n\n\n
  • \u65b9\u6cd5\u4f53\uff1a\u5355\u884c\u4ee3\u7801\u53ef\u7701\u7565\u5927\u62ec\u53f7\u4e0e return\uff0c\u591a\u884c\u5fc5\u987b\u7528{}<\/code>\u5305\u88f9<\/li>\n<\/ul>\n\n\n\n
    \u6700\u7b80\u793a\u4f8b\uff08\u65e0\u53c2 Lambda\uff09\uff1a<\/p>\n\n\n\n
    \/\/ \u65e0\u53c2\u6570\uff0c\u5355\u884c\u8f93\u51fa\n() -> System.out.println(\"\u4e91\u626c\");\n<\/code><\/pre>\n\n\n\n
    \u4e8c\u3001\u7ed3\u5408 Runnable \u63a5\u53e3\u7406\u89e3 Lambda<\/h2>\n\n\n\n
    Runnable<\/code>\u662f\u5178\u578b\u51fd\u6570\u5f0f\u63a5\u53e3<\/strong>\uff0c\u6e90\u7801\u88ab@FunctionalInterface<\/code>\u6ce8\u89e3\u4fee\u9970\uff0c\u89c4\u5b9a\u63a5\u53e3\u4e2d\u4ec5\u6709\u4e00\u4e2a\u62bd\u8c61\u65b9\u6cd5<\/strong>\uff0c\u53ea\u6709\u6ee1\u8db3\u8fd9\u4e2a\u6761\u4ef6\u7684\u63a5\u53e3\uff0c\u624d\u652f\u6301 Lambda \u5b9e\u73b0\u3002<\/p>\n\n\n\n
    1. Runnable \u63a5\u53e3\u6e90\u7801<\/h3>\n\n\n\n
    @FunctionalInterface\npublic interface Runnable {\n    void run();\n}\n<\/code><\/pre>\n\n\n\n
    @FunctionalInterface<\/code>\u6ce8\u89e3\u4f1a\u5728\u7f16\u8bd1\u671f\u6821\u9a8c\u63a5\u53e3\u62bd\u8c61\u65b9\u6cd5\u6570\u91cf\uff0c\u907f\u514d\u8bef\u6dfb\u52a0\u591a\u4e2a\u62bd\u8c61\u65b9\u6cd5\u5bfc\u81f4 Lambda \u65e0\u6cd5\u4f7f\u7528\u3002<\/p>\n\n\n\n
    2. Java8 \u4e4b\u524d\uff1a\u533f\u540d\u5185\u90e8\u7c7b\u521b\u5efa\u7ebf\u7a0b<\/h3>\n\n\n\n
    \u4f20\u7edf\u5199\u6cd5\u5197\u4f59\uff0c\u9700\u8981\u91cd\u5199\u5b8c\u6574\u63a5\u53e3\u65b9\u6cd5\uff0c\u4ee3\u7801\u81c3\u80bf\uff1a<\/p>\n\n\n\n
    public class LambdaDemo {\n    public static void main(String[] args) {\n        \/\/ \u533f\u540d\u5185\u90e8\u7c7b\u5199\u6cd5\n        new Thread(new Runnable() {\n            @Override\n            public void run() {\n                System.out.println(\"\u4f20\u7edf\u533f\u540d\u5185\u90e8\u7c7b\u542f\u52a8\u7ebf\u7a0b\");\n            }\n        }).start();\n    }\n}\n<\/code><\/pre>\n\n\n\n
    3. Lambda \u7b80\u5316\u5199\u6cd5<\/h3>\n\n\n\n
    \u501f\u52a9 Lambda \u7701\u7565\u63a5\u53e3\u5b9e\u73b0\u7c7b\uff0c\u4e00\u884c\u641e\u5b9a\u7ebf\u7a0b\u521b\u5efa\uff1a<\/p>\n\n\n\n
    public class LambdaDemo {\n    public static void main(String[] args) {\n        \/\/ Lambda\u7b80\u5316Runnable\u5b9e\u73b0\n        new Thread(() -> System.out.println(\"Lambda\u542f\u52a8\u7ebf\u7a0b\")).start();\n    }\n}\n<\/code><\/pre>\n\n\n\n
    \u5bf9\u6bd4\u80fd\u76f4\u89c2\u611f\u53d7\u5230 Lambda \u7cbe\u7b80\u4ee3\u7801\u7684\u4f18\u52bf\uff0c\u8fd9\u4e5f\u662f\u65e5\u5e38\u5f00\u53d1\u4e2d\u6700\u5e38\u7528\u7684\u573a\u666f\u4e4b\u4e00\u3002<\/p>\n\n\n\n
    \u4e09\u3001Lambda \u56db\u79cd\u5e38\u7528\u4f7f\u7528\u573a\u666f<\/h2>\n\n\n\n
    Lambda \u4e0d\u53ea\u662f\u7528\u6765\u521b\u5efa\u7ebf\u7a0b\uff0c\u65e5\u5e38\u5f00\u53d1\u4e2d\u53ef\u7528\u4e8e\u53d8\u91cf\u8d4b\u503c\u3001\u8fd4\u56de\u503c\u3001\u6570\u7ec4\u5143\u7d20\u3001\u65b9\u6cd5\u5165\u53c2<\/strong>\u56db\u79cd\u573a\u666f\u3002<\/p>\n\n\n\n
    public class LambdaUse {\n    public static void main(String[] args) {\n        \/\/ \u573a\u666f1\uff1a\u8d4b\u503c\u7ed9\u63a5\u53e3\u53d8\u91cf\n        Runnable run = () -> {\n            System.out.println(\"Lambda\u8d4b\u503c\u53d8\u91cf\");\n        };\n        run.run();\n\n        \/\/ \u573a\u666f2\uff1a\u4f5c\u4e3a\u65b9\u6cd5\u5165\u53c2\uff08\u524d\u9762\u7ebf\u7a0b\u793a\u4f8b\uff09\n        new Thread(() -> System.out.println(\"\u4f5c\u4e3a\u65b9\u6cd5\u53c2\u6570\")).start();\n\n        \/\/ \u573a\u666f3\uff1aLambda\u4f5c\u4e3a\u6570\u7ec4\u5143\u7d20\n        Runnable[] arr = {\n                () -> System.out.println(\"\u6570\u7ec4\u5143\u7d201\"),\n                () -> System.out.println(\"\u6570\u7ec4\u5143\u7d202\")\n        };\n        arr[0].run();\n    }\n\n    \/\/ \u573a\u666f4\uff1a\u65b9\u6cd5\u8fd4\u56deLambda\u8868\u8fbe\u5f0f\n    public static Runnable getRun() {\n        return () -> System.out.println(\"Lambda\u4f5c\u4e3a\u8fd4\u56de\u503c\");\n    }\n}\n<\/code><\/pre>\n\n\n\n
    \u56db\u3001Lambda \u53d8\u91cf\u4f5c\u7528\u57df\u7ec6\u8282<\/h2>\n\n\n\n
    1. \u5916\u90e8\u53d8\u91cf\u9650\u5236\uff1afinal\/effectively final<\/h3>\n\n\n\n
    Lambda\u4e0d\u4f1a\u5f00\u8f9f\u72ec\u7acb\u4f5c\u7528\u57df<\/strong>\uff0c\u5185\u90e8\u5f15\u7528\u5c40\u90e8\u53d8\u91cf\u65f6\uff0c\u53d8\u91cf\u5fc5\u987b\u662ffinal<\/code>\u6216\u8005\u7b49\u6548 final\uff08\u53ea\u8d4b\u503c\u4e00\u6b21\uff0c\u9690\u6027 final\uff09<\/strong>\uff0c\u4e0d\u5141\u8bb8\u76f4\u63a5\u5728 Lambda \u5185\u4fee\u6539\u57fa\u7840\u7c7b\u578b\u5c40\u90e8\u53d8\u91cf\u3002<\/p>\n\n\n\n
    \u9519\u8bef\u793a\u4f8b\uff1a<\/p>\n\n\n\n
    public class ScopeTest {\n    public static void main(String[] args) {\n        int num = 10;\n        Runnable r = () -> {\n            \/\/ \u7f16\u8bd1\u62a5\u9519\uff1anum\u975efinal\uff0c\u4e0d\u80fd\u4fee\u6539\n            num++;\n            System.out.println(num);\n        };\n    }\n}\n<\/code><\/pre>\n\n\n\n
    2. \u4e09\u79cd\u7a81\u7834\u53d8\u91cf\u4fee\u6539\u9650\u5236\u7684\u65b9\u6848<\/h3>\n\n\n\n
    \u5b9e\u9645\u5f00\u53d1\u4e2d\u9700\u8981\u5728 Lambda \u4fee\u6539\u6570\u503c\uff0c\u63a8\u8350\u4e09\u79cd\u89e3\u51b3\u65b9\u5f0f\uff1a<\/p>\n\n\n\n
      \n
    1. \u9759\u6001 static \u53d8\u91cf<\/strong>\uff1a\u9759\u6001\u53d8\u91cf\u5b58\u653e\u5728\u65b9\u6cd5\u533a\uff0c\u4e0d\u53d7 final \u7ea6\u675f<\/li>\n<\/ol>\n\n\n\n
      public class VarDemo {\n    static int count = 0;\n    public static void main(String[] args) {\n        Runnable r = () -> {\n            count++;\n            System.out.println(count);\n        };\n        r.run();\n    }\n}\n<\/code><\/pre>\n\n\n\n
        \n
      1. AtomicInteger \u539f\u5b50\u7c7b\uff08\u63a8\u8350\uff0c\u591a\u7ebf\u7a0b\u5b89\u5168\uff09<\/strong>\uff1aJUC \u5e76\u53d1\u5305\u5de5\u5177\uff0c\u539f\u5b50\u81ea\u589e<\/li>\n<\/ol>\n\n\n\n
        import java.util.concurrent.atomic.AtomicInteger;\npublic class VarDemo {\n    public static void main(String[] args) {\n        AtomicInteger count = new AtomicInteger(0);\n        Runnable r = () -> {\n            count.incrementAndGet();\n            System.out.println(count.get());\n        };\n        r.run();\n    }\n}\n<\/code><\/pre>\n\n\n\n
          \n
        1. \u6570\u7ec4\u5305\u88c5<\/strong>\uff1a\u6570\u7ec4\u662f\u5f15\u7528\u7c7b\u578b\uff0c\u6570\u7ec4\u5730\u5740\u4e0d\u53d8\u5373\u53ef\u4fee\u6539\u5185\u90e8\u5143\u7d20<\/li>\n<\/ol>\n\n\n\n
          public class VarDemo {\n    public static void main(String[] args) {\n        int[] arr = {0};\n        Runnable r = () -> {\n            arr[0]++;\n            System.out.println(arr[0]);\n        };\n        r.run();\n    }\n}\n<\/code><\/pre>\n\n\n\n
          \u4e94\u3001Lambda \u4e2d this \u5173\u952e\u5b57<\/h2>\n\n\n\n
          \u518d\u6b21\u5f3a\u8c03\uff1aLambda \u6ca1\u6709\u72ec\u7acb\u4f5c\u7528\u57df\uff0cthis<\/code>\u6307\u5411\u5b9a\u4e49 Lambda \u7684\u5916\u90e8\u7c7b\u5b9e\u4f8b<\/strong>\uff0c\u548c\u533f\u540d\u5185\u90e8\u7c7b\u5b8c\u5168\u4e0d\u540c\uff08\u533f\u540d\u5185\u90e8\u7c7b this \u6307\u5411\u81ea\u8eab\u5185\u90e8\u7c7b\u5bf9\u8c61\uff09\u3002<\/p>\n\n\n\n
          public class ThisDemo {\n    public void test() {\n        \/\/ Lambda\u7684this = ThisDemo\u7c7b\u5b9e\u4f8b\n        Runnable r = () -> System.out.println(this);\n        r.run();\n    }\n\n    public static void main(String[] args) {\n        new ThisDemo().test();\n    }\n}\n<\/code><\/pre>\n\n\n\n
          \u516d\u3001\u6587\u672b\u5c0f\u7ed3<\/h2>\n\n\n\n
            \n
          1. Lambda \u4f9d\u6258 \u51fd\u6570\u5f0f\u63a5\u53e3\uff08@FunctionalInterface\uff09 \u4f7f\u7528\uff0c\u5355\u4e00\u62bd\u8c61\u65b9\u6cd5\u662f\u524d\u63d0\uff1b<\/li>\n\n\n\n
          2. \u6838\u5fc3\u4f5c\u7528\uff1a\u7b80\u5316\u533f\u540d\u5185\u90e8\u7c7b\uff0c\u5b9e\u73b0\u51fd\u6570\u5f0f\u7f16\u7a0b\uff0c\u4ee3\u7801\u8f7b\u91cf\u5316\uff1b<\/li>\n\n\n\n
          3. \u53d8\u91cf\u89c4\u5219\uff1a\u5c40\u90e8\u53d8\u91cf\u8981\u6c42 effectively final\uff0c\u9700\u8981\u4fee\u6539\u53ef\u7528\u539f\u5b50\u7c7b\u3001\u6570\u7ec4\u3001\u9759\u6001\u53d8\u91cf\uff1b<\/li>\n\n\n\n
          4. this \u6307\u5411\uff1a\u5916\u5c42\u5bbf\u4e3b\u5bf9\u8c61\uff0c\u65e0\u72ec\u7acb\u5185\u90e8\u7c7b this\u3002<\/li>\n<\/ol>\n\n\n\n
            <\/p>\n","protected":false},"excerpt":{"rendered":"
            \u54c8\u55bd\u5404\u4f4d\u5c0f\u4f19\u4f34\uff0c\u8fd1\u671f\u4e00\u76f4\u5728\u68b3\u7406 Java8 \u6838\u5fc3\u65b0\u7279\u6027\u5185\u5bb9\uff0c\u4eca\u5929\u5c31\u6765\u8be6\u7ec6\u804a\u804a Java8 \u6807\u5fd7\u6027\u8bed\u6cd5 \u2014\u2014La<\/p>\n
            \n\t\t\t\t Read More <\/span> <\/i><\/a>\n\t\t\t<\/div>\n","protected":false},"author":1,"featured_media":1563,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[20],"tags":[15],"class_list":["post-1561","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-java","tag-java"],"_links":{"self":[{"href":"https:\/\/yunyanglib.cn\/index.php?rest_route=\/wp\/v2\/posts\/1561","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/yunyanglib.cn\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/yunyanglib.cn\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/yunyanglib.cn\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/yunyanglib.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=1561"}],"version-history":[{"count":3,"href":"https:\/\/yunyanglib.cn\/index.php?rest_route=\/wp\/v2\/posts\/1561\/revisions"}],"predecessor-version":[{"id":1607,"href":"https:\/\/yunyanglib.cn\/index.php?rest_route=\/wp\/v2\/posts\/1561\/revisions\/1607"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/yunyanglib.cn\/index.php?rest_route=\/wp\/v2\/media\/1563"}],"wp:attachment":[{"href":"https:\/\/yunyanglib.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=1561"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/yunyanglib.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=1561"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/yunyanglib.cn\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=1561"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}