{"id":203646,"date":"2025-05-22T11:16:18","date_gmt":"2025-05-22T03:16:18","guid":{"rendered":"https:\/\/server.hk\/cnblog\/203646\/"},"modified":"2025-05-22T11:16:18","modified_gmt":"2025-05-22T03:16:18","slug":"java-%e4%b8%ad%e7%9a%84-lambda-%e5%87%bd%e6%95%b0%e6%98%af%e4%bb%80%e4%b9%88%e4%bb%a5%e5%8f%8a%e7%a4%ba%e4%be%8b","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/203646\/","title":{"rendered":"Java \u4e2d\u7684 Lambda \u51fd\u6570\u662f\u4ec0\u4e48\u4ee5\u53ca\u793a\u4f8b"},"content":{"rendered":"

<\/b> <\/p>\n

Java \u4e2d\u7684 Lambda \u51fd\u6570\u662f\u4ec0\u4e48\u4ee5\u53ca\u793a\u4f8b<\/h1>\n

<\/i>\u6536\u85cf<\/span> <\/p>\n

\u4eca\u5929\u7ed9\u5927\u5bb6\u5e26\u6765\u4e86\u300aJava \u4e2d\u7684 Lambda \u51fd\u6570\u662f\u4ec0\u4e48\u4ee5\u53ca\u793a\u4f8b\u300b<\/span>\uff0c\u5176\u4e2d\u6d89\u53ca\u5230\u7684\u77e5\u8bc6\u70b9\u5305\u62ec<\/span>\u7b49\u7b49\uff0c\u65e0\u8bba\u4f60\u662f\u5c0f\u767d\u8fd8\u662f\u8001\u624b\uff0c\u90fd\u9002\u5408\u770b\u4e00\u770b\u54e6~\u6709\u597d\u7684\u5efa\u8bae\u4e5f\u6b22\u8fce\u5927\u5bb6\u5728\u8bc4\u8bba\u7559\u8a00\uff0c\u82e5\u662f\u770b\u5b8c\u6709\u6240\u6536\u83b7\uff0c\u4e5f\u5e0c\u671b\u5927\u5bb6\u80fd\u591a\u591a\u70b9\u8d5e\u652f\u6301\u5440\uff01\u4e00\u8d77\u52a0\u6cb9\u5b66\u4e60~<\/p>\n

<\/p>\n

1. \u4e86\u89e3 lambda \u51fd\u6570 <\/h2>\n

lambda \u51fd\u6570\u6216 lambda \u8868\u8fbe\u5f0f\u662f\u4e00\u79cd\u4e3a\u5728 java \u4e2d\u7f16\u5199\u533f\u540d\u65b9\u6cd5\u63d0\u4f9b\u6e05\u6670\u7b80\u6d01\u7684\u8bed\u6cd5\u7684\u65b9\u6cd5\u3002\u5b83\u4eec\u4f7f\u60a8\u80fd\u591f\u4ee5\u66f4\u5177\u53ef\u8bfb\u6027\u548c\u8868\u73b0\u529b\u7684\u65b9\u5f0f\u7f16\u5199\u529f\u80fd\u63a5\u53e3\u7684\u5b9e\u73b0\u3002 <\/p>\n

1.1 \u4ec0\u4e48\u662f lambda \u51fd\u6570\uff1f <\/h3>\n

java \u4e2d\u7684 lambda \u51fd\u6570\u662f\u4e00\u5c0f\u6bb5\u4ee3\u7801\uff0c\u5b83\u63a5\u53d7\u53c2\u6570\u5e76\u8fd4\u56de\u4e00\u4e2a\u503c\u3002\u5b83\u672c\u8d28\u4e0a\u662f\u4e00\u4e2a\u6ca1\u6709\u540d\u79f0\u7684\u65b9\u6cd5\uff0c\u5141\u8bb8\u60a8\u5c06\u529f\u80fd\u4f5c\u4e3a\u53c2\u6570\u4f20\u9012\u7ed9\u65b9\u6cd5\u6216\u5c06\u5176\u5b58\u50a8\u4e3a\u53d8\u91cf\u3002 <\/p>\n

\u8bed\u6cd5<\/strong><\/p>\n

lambda \u51fd\u6570\u7684\u57fa\u672c\u8bed\u6cd5\u5982\u4e0b\uff1a<\/p>\n

(parameters) -> expression\n<\/pre>\n
\u6216\u8005\uff0c\u5982\u679c\u60a8\u6709\u591a\u4e2a\u8bed\u53e5\uff1a<\/p>\n
(parameters) -> {\n    \/\/ multiple statements\n}\n<\/pre>\n
 1.2 \u529f\u80fd\u63a5\u53e3 <\/h3>\n
\u8981\u4f7f\u7528 lambda \u8868\u8fbe\u5f0f\uff0c\u60a8\u9700\u8981\u4e00\u4e2a\u51fd\u6570\u5f0f\u63a5\u53e3\u3002\u51fd\u6570\u5f0f\u63a5\u53e3\u662f\u4e00\u79cd\u53ea\u6709\u4e00\u4e2a\u62bd\u8c61\u65b9\u6cd5\u7684\u63a5\u53e3\u3002\u793a\u4f8b\u5305\u62ec\u5177\u6709\u5355\u4e2a\u62bd\u8c61\u65b9\u6cd5\u7684 runnable\u3001callable \u548c\u81ea\u5b9a\u4e49\u63a5\u53e3\u3002 <\/p>\n
 1.3 lambda \u51fd\u6570\u7684\u4f18\u70b9 <\/h3>\n
    \n
  •  \u7b80\u6d01<\/strong>\uff1alambda \u8868\u8fbe\u5f0f\u6709\u52a9\u4e8e\u51cf\u5c11\u6837\u677f\u4ee3\u7801\u3002<\/li>\n
  •  \u53ef\u8bfb\u6027<\/strong>\uff1a\u5b83\u4eec\u4f7f\u4ee3\u7801\u66f4\u5177\u53ef\u8bfb\u6027\u548c\u8868\u73b0\u529b\u3002<\/li>\n
  •  \u6613\u4e8e\u4f7f\u7528<\/strong>\uff1a\u5728\u6d41\u64cd\u4f5c\u548c\u4e8b\u4ef6\u5904\u7406\u7b49\u573a\u666f\u4e2d\u5f88\u6709\u7528\u3002<\/li>\n<\/ul>\n
     2. \u5728 java \u4e2d\u4f7f\u7528 lambda \u51fd\u6570 <\/h2>\n
     2.1 \u57fa\u672c\u793a\u4f8b <\/h3>\n
    \u8ba9\u6211\u4eec\u4ece java \u4e2d lambda \u51fd\u6570\u7684\u4e00\u4e2a\u7b80\u5355\u793a\u4f8b\u5f00\u59cb\u3002\u6211\u4eec\u5c06\u4f7f\u7528 runnable \u63a5\u53e3\u6765\u6f14\u793a\uff1a<\/p>\n
    public class lambdaexample {\n    public static void main(string[] args) {\n        \/\/ traditional way\n        runnable oldrunnable = new runnable() {\n            @override\n            public void run() {\n                system.out.println(\"running in a thread!\");\n            }\n        };\n        new thread(oldrunnable).start();\n\n        \/\/ using lambda expression\n        runnable lambdarunnable = () -> system.out.println(\"running in a thread with lambda!\");\n        new thread(lambdarunnable).start();\n    }\n}\n<\/pre>\n
    \u8f93\u51fa<\/strong><\/p>\n
    running in a thread!\nrunning in a thread with lambda!\n<\/pre>\n
     2.2 \u9ad8\u7ea7\u793a\u4f8b\uff1a\u5c06 lambda \u4e0e\u96c6\u5408\u7ed3\u5408\u4f7f\u7528 <\/h3>\n
    lambda \u51fd\u6570\u5728\u5904\u7406\u96c6\u5408\u65f6\u7279\u522b\u6709\u7528\u3002\u4e0b\u9762\u662f\u4e00\u4e2a\u6f14\u793a\u4f7f\u7528 lambda \u8868\u8fbe\u5f0f\u5bf9\u5b57\u7b26\u4e32\u5217\u8868\u8fdb\u884c\u6392\u5e8f\u7684\u793a\u4f8b\uff1a<\/p>\n
    import java.util.arrays;\nimport java.util.list;\n\npublic class lambdalistexample {\n    public static void main(string[] args) {\n        list<string> names = arrays.aslist(\"john\", \"jane\", \"paul\", \"alice\");\n\n        \/\/ using lambda to sort the list\n        names.sort((name1, name2) -> name1.compareto(name2));\n\n        \/\/ printing sorted names\n        names.foreach(name -> system.out.println(name));\n    }\n}\n<\/pre>\n
    \u8f93\u51fa<\/strong><\/p>\n
    alice\njane\njohn\npaul\n<\/pre>\n
     2.3 \u5b9e\u9645\u6f14\u793a\uff1a\u4f7f\u7528\u6d41\u8fdb\u884c\u8fc7\u6ee4 <\/h3>\n
    lambda \u8868\u8fbe\u5f0f\u4e0e java streams \u7ed3\u5408\u4f7f\u7528\u4ee5\u8fdb\u884c\u8fc7\u6ee4\u548c\u6620\u5c04\u7b49\u64cd\u4f5c\u65f6\u4f1a\u5927\u653e\u5f02\u5f69\u3002\u4ee5\u4e0b\u662f\u5982\u4f55\u4f7f\u7528 lambda \u8fc7\u6ee4\u548c\u5904\u7406\u6574\u6570\u5217\u8868\uff1a<\/p>\n
    import java.util.arrays;\nimport java.util.list;\nimport java.util.stream.collectors;\n\npublic class lambdastreamexample {\n    public static void main(string[] args) {\n        list<integer> numbers = arrays.aslist(1, 2, 3, 4, 5, 6, 7, 8, 9, 10);\n\n        \/\/ filtering even numbers and squaring them\n        list<integer> squaredevens = numbers.stream()\n            .filter(n -> n % 2 == 0)\n            .map(n -> n * n)\n            .collect(collectors.tolist());\n\n        \/\/ printing the result\n        squaredevens.foreach(system.out::println);\n    }\n}\n<\/pre>\n
    \u8f93\u51fa<\/strong><\/p>\n
    4\n16\n36\n64\n100\n<\/pre>\n
     \u4e09\u3001\u7ed3\u8bba <\/h2>\n
    java \u4e2d\u7684 lambda \u51fd\u6570\u63d0\u4f9b\u4e86\u4e00\u79cd\u66f4\u7d27\u51d1\u3001\u66f4\u5177\u8868\u73b0\u529b\u7684\u65b9\u5f0f\u6765\u5904\u7406\u533f\u540d\u65b9\u6cd5\u548c\u51fd\u6570\u5f0f\u63a5\u53e3\u3002\u5b83\u4eec\u53ef\u4ee5\u6781\u5927\u5730\u7b80\u5316\u60a8\u7684\u4ee3\u7801\u5e76\u63d0\u9ad8\u5176\u53ef\u8bfb\u6027\uff0c\u7279\u522b\u662f\u5728\u5904\u7406\u96c6\u5408\u548c\u6d41\u64cd\u4f5c\u65f6\u3002 <\/p>\n
    \u5982\u679c\u60a8\u6709\u4efb\u4f55\u7591\u95ee\u6216\u9700\u8981\u8fdb\u4e00\u6b65\u8bf4\u660e\uff0c\u8bf7\u968f\u65f6\u5728\u4e0b\u9762\u53d1\u8868\u8bc4\u8bba\uff01 <\/p>\n
    \u9605\u8bfb\u66f4\u591a\u6587\u7ae0<\/strong>\uff1a\u4ec0\u4e48\u662f java \u4e2d\u7684 lambda \u51fd\u6570\u548c\u793a\u4f8b\u3002<\/p>\n
    \u4eca\u5929\u5173\u4e8e\u300aJava \u4e2d\u7684 Lambda \u51fd\u6570\u662f\u4ec0\u4e48\u4ee5\u53ca\u793a\u4f8b\u300b\u7684\u5185\u5bb9\u5c31\u4ecb\u7ecd\u5230\u8fd9\u91cc\u4e86\uff0c\u662f\u4e0d\u662f\u5b66\u8d77\u6765\u4e00\u76ee\u4e86\u7136\uff01\u60f3\u8981\u4e86\u89e3\u66f4\u591a\u5173\u4e8e\u7684\u5185\u5bb9\u8bf7\u5173\u6ce8\u516c\u4f17\u53f7\uff01<\/p>\n
          \u7248\u672c\u58f0\u660e \u672c\u6587\u8f6c\u8f7d\u4e8e\uff1adev.to \u5982\u6709\u4fb5\u72af\uff0c\u8bf7\u8054\u7cfb\u5220\u9664<\/p>\n","protected":false},"excerpt":{"rendered":"
    Java \u4e2d\u7684 Lambda \u51fd...<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[4925],"tags":[],"class_list":["post-203646","post","type-post","status-publish","format-standard","hentry","category-4925"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/203646","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/comments?post=203646"}],"version-history":[{"count":0,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/203646\/revisions"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=203646"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=203646"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=203646"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}