{"id":264,"date":"2023-12-11T19:51:31","date_gmt":"2023-12-11T11:51:31","guid":{"rendered":"http:\/\/ericw.top\/?p=264"},"modified":"2023-12-11T19:51:31","modified_gmt":"2023-12-11T11:51:31","slug":"lambda","status":"publish","type":"post","link":"http:\/\/ericw.top\/?p=264","title":{"rendered":"Lambda"},"content":{"rendered":"

Lambda\u8868\u8fbe\u5f0f<\/h1>\n

Lambda\u8868\u8fbe\u5f0f\u662fJava\u7f16\u7a0b\u8bed\u8a00\u4e2d\u5f15\u5165\u7684\u4e00\u4e2a\u5f3a\u5927\u7684\u7279\u6027\uff0c\u5b83\u4f7f\u5f97\u7f16\u5199\u66f4\u52a0\u7b80\u6d01\u3001\u53ef\u8bfb\u6027\u66f4\u5f3a\u7684\u4ee3\u7801\u53d8\u5f97\u66f4\u5bb9\u6613\u3002<\/p>\n

\u4ec0\u4e48\u662fLambda\u8868\u8fbe\u5f0f\uff1f<\/h2>\n

Lambda\u8868\u8fbe\u5f0f\uff0c\u4e5f\u79f0\u4e3a\u95ed\u5305\uff0c\u662f\u4e00\u79cd\u533f\u540d\u51fd\u6570\uff0c\u5b83\u53ef\u4ee5\u4f20\u9012\u5230\u65b9\u6cd5\u4f5c\u4e3a\u53c2\u6570\uff0c\u5e76\u4e14\u53ef\u4ee5\u5728\u65b9\u6cd5\u4e2d\u4f7f\u7528\u3002\u5b83\u662fJava 8\u5f15\u5165\u7684\u4e00\u4e2a\u65b0\u7279\u6027\uff0c\u7528\u4e8e\u7b80\u5316\u4ee3\u7801\u7684\u7f16\u5199\uff0c\u7279\u522b\u662f\u5728\u4f7f\u7528\u51fd\u6570\u5f0f\u63a5\u53e3\u65f6\u3002<\/p>\n

Lambda\u8868\u8fbe\u5f0f\u7684\u4e3b\u8981\u7279\u70b9\u5305\u62ec\uff1a<\/p>\n

\u533f\u540d\u6027\uff1aLambda\u8868\u8fbe\u5f0f\u6ca1\u6709\u663e\u5f0f\u7684\u540d\u79f0\uff0c\u56e0\u6b64\u53ef\u4ee5\u88ab\u5f53\u505a\u4e00\u79cd\u533f\u540d\u51fd\u6570\u4f7f\u7528\u3002<\/strong>
\n\u7b80\u6d01\u6027\uff1aLambda\u8868\u8fbe\u5f0f\u53ef\u4ee5\u5927\u5927\u51cf\u5c11\u4ee3\u7801\u7684\u5197\u4f59\uff0c\u4f7f\u4ee3\u7801\u66f4\u52a0\u7b80\u6d01\u3002<\/strong>
\n\u4f20\u9012\u6027\uff1aLambda\u8868\u8fbe\u5f0f\u53ef\u4ee5\u4f5c\u4e3a\u53c2\u6570\u4f20\u9012\u7ed9\u65b9\u6cd5\uff0c\u4ece\u800c\u5b9e\u73b0\u66f4\u7075\u6d3b\u7684\u4ee3\u7801\u7ec4\u7ec7\u3002<\/strong><\/p>\n

Lambda\u8868\u8fbe\u5f0f\u7684\u8bed\u6cd5<\/h2>\n
(parameter1, parameter2, ...) -> expression<\/code><\/pre>\n
    \n
  • parameter1, parameter2, \u2026\uff1a\u662fLambda\u8868\u8fbe\u5f0f\u7684\u53c2\u6570\u5217\u8868\u3002<\/li>\n
  • ->\uff1a\u662fLambda\u8fd0\u7b97\u7b26\uff0c\u7528\u4e8e\u5206\u9694\u53c2\u6570\u5217\u8868\u548c\u8868\u8fbe\u5f0f\u3002<\/li>\n
  • expression\uff1a\u662fLambda\u8868\u8fbe\u5f0f\u7684\u4e3b\u4f53\uff0c\u5305\u542b\u4e86Lambda\u8868\u8fbe\u5f0f\u7684\u5177\u4f53\u529f\u80fd\u3002<\/li>\n<\/ul>\n
    Lambda\u8868\u8fbe\u5f0f\u53ef\u4ee5\u5177\u6709\u96f6\u4e2a\u3001\u4e00\u4e2a\u6216\u591a\u4e2a\u53c2\u6570\uff0c\u751a\u81f3\u53ef\u4ee5\u4e0d\u5305\u542b\u53c2\u6570\u3002<\/strong><\/p>\n
    \u4e0b\u9762\u662f\u4e00\u4e9bLambda\u8868\u8fbe\u5f0f\uff1a<\/p>\n
    \u65e0\u53c2\u6570\u7684Lambda\u8868\u8fbe\u5f0f\uff1a<\/p>\n
    () -> System.out.println("Hello, Lambda!");<\/code><\/pre>\n
    \u5e26\u4e00\u4e2a\u53c2\u6570\u7684Lambda\u8868\u8fbe\u5f0f\uff1a<\/p>\n
    (name) -> System.out.println("Hello, " + name);<\/code><\/pre>\n
    \u5e26\u6709\u591a\u4e2a\u53c2\u6570\u7684Lambda\u5f0f\uff1a<\/p>\n
    (x, y) -> x + y<\/code><\/pre>\n
    Lambda\u8868\u8fbe\u5f0f\u4e0e\u51fd\u6570\u5f0f\u63a5\u53e3<\/h3>\n
    Lambda\u8868\u8fbe\u5f0f\u901a\u5e38\u4e0e\u51fd\u6570\u5f0f\u63a5\u53e3\uff08Functional Interface\uff09\u4e00\u8d77\u4f7f\u7528\u3002\u51fd\u6570\u5f0f\u63a5\u53e3\u662f\u4e00\u4e2a\u53ea\u5305\u542b\u4e00\u4e2a\u62bd\u8c61\u65b9\u6cd5\u7684\u63a5\u53e3\u3002Lambda\u8868\u8fbe\u5f0f\u53ef\u4ee5\u4f7f\u7528\u8fd9\u4e2a\u62bd\u8c61\u65b9\u6cd5\u7684\u7b7e\u540d\u6765\u5b9e\u73b0\u8be5\u63a5\u53e3\uff0c\u4ece\u800c\u7b80\u5316\u4ee3\u7801\u3002<\/p>\n
    \u4f8b\u5982\uff0cJava\u6807\u51c6\u5e93\u4e2d\u7684java.lang.Runnable\u5c31\u662f\u4e00\u4e2a\u51fd\u6570\u5f0f\u63a5\u53e3\uff0c\u5b83\u53ea\u5305\u542b\u4e00\u4e2avoid run()\u65b9\u6cd5\u3002\u6211\u4eec\u53ef\u4ee5\u4f7f\u7528Lambda\u8868\u8fbe\u5f0f\u6765\u521b\u5efaRunnable\u5bf9\u8c61\uff1a<\/p>\n
    Runnable runnable = () -> System.out.println("Hello from Runnable!");<\/code><\/pre>\n
    Lambda\u8868\u8fbe\u5f0f\u7684\u5e94\u7528\u573a\u666f<\/h3>\n
    Lambda\u8868\u8fbe\u5f0f\u5728Java\u7f16\u7a0b\u4e2d\u6709\u8bb8\u591a\u5e94\u7528\u573a\u666f\uff0c\u5305\u62ec\u4f46\u4e0d\u9650\u4e8e\u4ee5\u4e0b\u51e0\u4e2a\u65b9\u9762\uff1a<\/p>\n
      \n
    1. \u7b80\u5316\u96c6\u5408\u64cd\u4f5c
      \nLambda\u8868\u8fbe\u5f0f\u53ef\u4ee5\u7528\u4e8e\u7b80\u5316\u96c6\u5408\u7684\u64cd\u4f5c\uff0c\u4f8b\u5982\u4f7f\u7528forEach\u65b9\u6cd5\u904d\u5386\u96c6\u5408\u5143\u7d20\uff1a<\/li>\n<\/ol>\n
      List<String> names = Arrays.asList("Alice", "Bob", "Charlie");\nnames.forEach(name -> System.out.println("Hello, " + name));<\/code><\/pre>\n
        \n
      1. \u7ebf\u7a0b\u4e0e\u5e76\u53d1\u7f16\u7a0b
        \nLambda\u8868\u8fbe\u5f0f\u53ef\u4ee5\u7528\u4e8e\u521b\u5efa\u7ebf\u7a0b\u548c\u5e76\u53d1\u7f16\u7a0b\u4e2d\u7684\u5404\u79cd\u4efb\u52a1\uff1a<\/li>\n<\/ol>\n
        \/\/ \u521b\u5efa\u4e00\u4e2a\u65b0\u7ebf\u7a0b\nThread thread = new Thread(() -> System.out.println("Hello from Lambda Thread!"));\nthread.start();<\/code><\/pre>\n
          \n
        1. \u4e8b\u4ef6\u5904\u7406
          \nLambda\u8868\u8fbe\u5f0f\u53ef\u7528\u4e8e\u4e8b\u4ef6\u5904\u7406\uff0c\u4f8b\u5982Swing\u5e94\u7528\u7a0b\u5e8f\u4e2d\u7684\u6309\u94ae\u70b9\u51fb\u4e8b\u4ef6\uff1a<\/li>\n<\/ol>\n
          button.addActionListener(e -> System.out.println("Button clicked!"));<\/code><\/pre>\n
            \n
          1. \u51fd\u6570\u5f0f\u7f16\u7a0b
            \nLambda\u8868\u8fbe\u5f0f\u4f7fJava\u66f4\u52a0\u652f\u6301\u51fd\u6570\u5f0f\u7f16\u7a0b\uff0c\u53ef\u4ee5\u7f16\u5199\u66f4\u51fd\u6570\u5f0f\u98ce\u683c\u7684\u4ee3\u7801\uff0c\u5982\u4f7f\u7528`Stream`\u8fdb\u884c\u6570\u636e\u5904\u7406\uff1a<\/li>\n<\/ol>\n
            List<Integer> numbers = Arrays.asList(1, 2, 3, 4, 5);\nint sum = numbers.stream().reduce(0, (a, b) -> a + b);<\/code><\/pre>\n
            Lambda\u8868\u8fbe\u5f0f\u7684\u6ce8\u610f\u4e8b\u9879<\/h3>\n
            \u5728\u4f7f\u7528Lambda\u8868\u8fbe\u5f0f\u65f6\uff0c\u9700\u8981\u6ce8\u610f\u4ee5\u4e0b\u51e0\u70b9\uff1a<\/p>\n
              \n
            • \n
              \u53c2\u6570\u7c7b\u578b\u63a8\u65ad\uff1aLambda\u8868\u8fbe\u5f0f\u7684\u53c2\u6570\u7c7b\u578b\u53ef\u4ee5\u6839\u636e\u4e0a\u4e0b\u6587\u8fdb\u884c\u63a8\u65ad\uff0c\u901a\u5e38\u4e0d\u9700\u8981\u663e\u5f0f\u58f0\u660e\u53c2\u6570\u7c7b\u578b\u3002<\/p>\n<\/li>\n
            • \n
              \u5c40\u90e8\u53d8\u91cf\u9650\u5236\uff1aLambda\u8868\u8fbe\u5f0f\u53ef\u4ee5\u8bbf\u95ee\u5916\u90e8\u7684\u5c40\u90e8\u53d8\u91cf\uff0c\u4f46\u8fd9\u4e9b\u53d8\u91cf\u5fc5\u987b\u662f\u6700\u7ec8\uff08final\uff09\u6216\u4e8b\u5b9e\u4e0a\u6700\u7ec8\uff08effectively final\uff09\u7684\u3002<\/p>\n<\/li>\n
            • \n
              \u65b9\u6cd5\u5f15\u7528\uff1aLambda\u8868\u8fbe\u5f0f\u901a\u5e38\u7528\u4e8e\u7b80\u5355\u7684\u529f\u80fd\uff0c\u5982\u679c\u529f\u80fd\u8f83\u590d\u6742\uff0c\u53ef\u4ee5\u8003\u8651\u4f7f\u7528\u65b9\u6cd5\u5f15\u7528\u3002<\/p>\n<\/li>\n<\/ul>\n
              Lambda\u8868\u8fbe\u5f0f\u7684\u5e94\u7528\u975e\u5e38\u5e7f\u6cdb\uff0c\u5b83\u53ef\u4ee5\u7528\u4e8e\u7b80\u5316\u4ee3\u7801\u3001\u5b9e\u73b0\u51fd\u6570\u5f0f\u7f16\u7a0b\u3001\u5904\u7406\u96c6\u5408\u3001\u5904\u7406\u4e8b\u4ef6\u3001\u5e76\u53d1\u7f16\u7a0b\u7b49\u591a\u4e2a\u65b9\u9762\u3002\u6839\u636e\u4e0d\u540c\u7684\u573a\u666f\u548c\u9700\u6c42\uff0c\u53ef\u4ee5\u9009\u62e9\u5408\u9002\u7684\u51fd\u6570\u5f0f\u63a5\u53e3\u548cLambda\u8868\u8fbe\u5f0f\u6765\u5b9e\u73b0\u76f8\u5e94\u7684\u529f\u80fd\u3002<\/strong><\/p>\n","protected":false},"excerpt":{"rendered":"
              Lambda\u8868\u8fbe\u5f0f Lambda\u8868\u8fbe\u5f0f\u662fJava\u7f16\u7a0b\u8bed\u8a00\u4e2d\u5f15\u5165\u7684\u4e00\u4e2a\u5f3a\u5927\u7684\u7279\u6027\uff0c\u5b83\u4f7f\u5f97\u7f16\u5199\u66f4\u52a0\u7b80\u6d01\u3001\u53ef\u8bfb\u6027\u66f4\u5f3a […]<\/p>\n","protected":false},"author":1,"featured_media":265,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[7,5],"tags":[],"_links":{"self":[{"href":"http:\/\/ericw.top\/index.php?rest_route=\/wp\/v2\/posts\/264"}],"collection":[{"href":"http:\/\/ericw.top\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/ericw.top\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/ericw.top\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"http:\/\/ericw.top\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=264"}],"version-history":[{"count":1,"href":"http:\/\/ericw.top\/index.php?rest_route=\/wp\/v2\/posts\/264\/revisions"}],"predecessor-version":[{"id":266,"href":"http:\/\/ericw.top\/index.php?rest_route=\/wp\/v2\/posts\/264\/revisions\/266"}],"wp:featuredmedia":[{"embeddable":true,"href":"http:\/\/ericw.top\/index.php?rest_route=\/wp\/v2\/media\/265"}],"wp:attachment":[{"href":"http:\/\/ericw.top\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=264"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/ericw.top\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=264"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/ericw.top\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=264"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}