{"id":202789,"date":"2025-05-22T10:56:30","date_gmt":"2025-05-22T02:56:30","guid":{"rendered":"https:\/\/server.hk\/cnblog\/202789\/"},"modified":"2025-05-22T10:56:30","modified_gmt":"2025-05-22T02:56:30","slug":"java-%e5%87%bd%e6%95%b0%e5%92%8c-java-%e6%96%b9%e6%b3%95%e5%9c%a8-lambda-%e8%a1%a8%e8%be%be%e5%bc%8f%e4%b8%ad%e7%9a%84%e5%ba%94%e7%94%a8","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/202789\/","title":{"rendered":"Java \u51fd\u6570\u548c Java \u65b9\u6cd5\u5728 Lambda \u8868\u8fbe\u5f0f\u4e2d\u7684\u5e94\u7528"},"content":{"rendered":"

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

Java \u51fd\u6570\u548c Java \u65b9\u6cd5\u5728 Lambda \u8868\u8fbe\u5f0f\u4e2d\u7684\u5e94\u7528<\/h1>\n

\u7f16\u7a0b\u5e76\u4e0d\u662f\u4e00\u4e2a\u673a\u68b0\u6027\u7684\u5de5\u4f5c\uff0c\u800c\u662f\u9700\u8981\u6709\u601d\u8003\uff0c\u6709\u521b\u65b0\u7684\u5de5\u4f5c\uff0c\u8bed\u6cd5\u662f\u56fa\u5b9a\u7684\uff0c\u4f46\u89e3\u51b3\u95ee\u9898\u7684\u601d\u8def\u5219\u662f\u4f9d\u9760\u4eba\u7684\u601d\u7ef4\uff0c\u8fd9\u5c31\u9700\u8981\u6211\u4eec\u575a\u6301\u5b66\u4e60\u548c\u66f4\u65b0\u81ea\u5df1\u7684\u77e5\u8bc6\u3002\u4eca\u5929\u5c31\u6574\u7406\u5206\u4eab\u300aJava \u51fd\u6570\u548c Java \u65b9\u6cd5\u5728 Lambda \u8868\u8fbe\u5f0f\u4e2d\u7684\u5e94\u7528\u300b\uff0c\u6587\u7ae0\u8bb2\u89e3\u7684\u77e5\u8bc6\u70b9\u4e3b\u8981\u5305\u62ec\uff0c\u5982\u679c\u4f60\u5bf9\u6587\u7ae0\u65b9\u9762\u7684\u77e5\u8bc6\u70b9\u611f\u5174\u8da3\uff0c\u5c31\u4e0d\u8981\u9519\u8fc7\uff0c\u5728\u8fd9\u53ef\u4ee5\u5bf9\u5927\u5bb6\u7684\u77e5\u8bc6\u79ef\u7d2f\u6709\u6240\u5e2e\u52a9\uff0c\u52a9\u529b\u5f00\u53d1\u80fd\u529b\u7684\u63d0\u5347\u3002<\/p>\n

Java Lambda \u8868\u8fbe\u5f0f\u53ef\u4f7f\u7528\u51fd\u6570\u548c\u65b9\u6cd5\u4f5c\u4e3a\u53c2\u6570\uff0c\u7b80\u5316\u4ee3\u7801\u3002\u51fd\u6570\u548c\u65b9\u6cd5\u5747\u63a5\u53d7\u8f93\u5165\u5e76\u4ea7\u751f\u8f93\u51fa\uff0c\u53ef\u4f20\u9012\u7ed9 Lambda \u8868\u8fbe\u5f0f\uff0c\u5b9e\u73b0\u7b80\u6d01\u548c\u53ef\u8bfb\u7684\u4ee3\u7801\u3002<\/p>\n

<\/p>\n

Java \u51fd\u6570\u548c\u65b9\u6cd5\u5728 Lambda \u8868\u8fbe\u5f0f\u4e2d\u7684\u5e94\u7528<\/strong><\/p>\n

Lambda \u8868\u8fbe\u5f0f\u662f\u4e00\u79cd\u7b80\u5316 Java \u4ee3\u7801\u7684\u65b9\u5f0f\uff0c\u5141\u8bb8\u5c06\u51fd\u6570\u4f5c\u4e3a\u53c2\u6570\u4f20\u9012\u3002\u5728 Lambda \u8868\u8fbe\u5f0f\u4e2d\u4f7f\u7528 Java \u51fd\u6570\u548c\u65b9\u6cd5\u53ef\u4ee5\u8fdb\u4e00\u6b65\u589e\u5f3a\u4ee3\u7801\u7684\u7b80\u6d01\u6027\u548c\u53ef\u8bfb\u6027\u3002<\/p>\n

\u51fd\u6570<\/strong><\/p>\n

Java \u51fd\u6570\u662f\u63a5\u53d7\u8f93\u5165\u5e76\u4ea7\u751f\u8f93\u51fa\u7684\u65e0\u72b6\u6001\u64cd\u4f5c\u3002\u5b83\u4eec\u53ef\u4ee5\u4f5c\u4e3a Lambda \u8868\u8fbe\u5f0f\u4e2d\u7684\u53c2\u6570\u4f20\u9012\u3002\u4f8b\u5982\uff1a<\/p>\n

\/\/ \u5b9a\u4e49\u4e00\u4e2a\u63a5\u53d7\u6574\u6570\u5e76\u8fd4\u56de\u5176\u5e73\u65b9\u503c\u7684\u51fd\u6570\nFunction<Integer, Integer> square = x -> x * x;\n\n\/\/ Lambda \u8868\u8fbe\u5f0f\u4f7f\u7528\u51fd\u6570 square\nList<Integer> numbers = List.of(1, 2, 3, 4, 5);\nList<Integer> squares = numbers.stream()\n    .map(square)\n    .toList();<\/pre>\n
\u65b9\u6cd5<\/strong><\/p>\n
Java \u65b9\u6cd5\u53ef\u4ee5\u50cf\u51fd\u6570\u4e00\u6837\u5728 Lambda \u8868\u8fbe\u5f0f\u4e2d\u4f7f\u7528\u3002\u4e3a\u4e86\u4f7f\u65b9\u6cd5\u6210\u4e3a\u51fd\u6570\u5f0f\u63a5\u53e3\uff0c\u9700\u8981\u4f7f\u7528 @FunctionalInterface<\/code> \u6ce8\u89e3\uff1a<\/p>\n
@FunctionalInterface\ninterface SquareFunction {\n    int apply(int x);\n}<\/pre>\n
\u73b0\u5728\uff0c\u6211\u4eec\u53ef\u4ee5\u5c06\u65b9\u6cd5\u4f5c\u4e3a Lambda \u8868\u8fbe\u5f0f\u4e2d\u7684\u53c2\u6570\u4f20\u9012\uff1a<\/p>\n
\/\/ \u5b9a\u4e49\u4e00\u4e2a\u65b9\u6cd5\u6765\u8ba1\u7b97\u6574\u6570\u5e73\u65b9\u503c\nSquareFunction squareMethod = Integer::square;\n\n\/\/ Lambda \u8868\u8fbe\u5f0f\u4f7f\u7528\u65b9\u6cd5 squareMethod\nList<Integer> squares = numbers.stream()\n    .map(squareMethod)\n    .toList();<\/pre>\n
\u5b9e\u6218\u6848\u4f8b<\/strong><\/p>\n
\u8003\u8651\u4e00\u4e2a\u9700\u8981\u5bf9\u5b57\u7b26\u4e32\u5217\u8868\u6267\u884c\u5404\u79cd\u64cd\u4f5c\u7684\u5e94\u7528\u7a0b\u5e8f\u3002\u6211\u4eec\u53ef\u4ee5\u4f7f\u7528 Lambda \u8868\u8fbe\u5f0f\u5c06\u8fd9\u4e9b\u64cd\u4f5c\u4f20\u9012\u4e3a\u51fd\u6570\u6216\u65b9\u6cd5\u3002<\/p>\n
List<String> strings = List.of(\"apple\", \"banana\", \"cherry\", \"dog\", \"elephant\");\n\n\/\/ \u4f7f\u7528\u51fd\u6570\u5c06\u5b57\u7b26\u4e32\u8f6c\u6362\u4e3a\u5927\u5199\u5b57\u6bcd\nList<String> upperCaseStrings = strings.stream()\n    .map(String::toUpperCase)\n    .toList();\n\n\/\/ \u4f7f\u7528\u65b9\u6cd5\u5c06\u5b57\u7b26\u4e32\u6309\u957f\u5ea6\u6392\u5e8f\nList<String> sortedByLengthStrings = strings.stream()\n    .sorted(Comparator.comparing(String::length)) \/\/ \u4f7f\u7528\u65b9\u6cd5\u6392\u5e8f\n    .toList();\n\n\/\/ \u4f7f\u7528\u51fd\u6570\u8fc7\u6ee4\u51fa\u5305\u542b\u5b57\u6bcd \"e\" \u7684\u5b57\u7b26\u4e32\nList<String> stringsWithE = strings.stream()\n    .filter(s -> s.contains(\"e\")) \/\/ \u4f7f\u7528\u51fd\u6570\u8fc7\u6ee4\n    .toList();<\/pre>\n
\u603b\u4e4b\uff0c\u5728 Lambda \u8868\u8fbe\u5f0f\u4e2d\u4f7f\u7528 Java \u51fd\u6570\u548c\u65b9\u6cd5\u63d0\u4f9b\u4e86\u7b80\u6d01\u3001\u53ef\u8bfb\u548c\u53ef\u6269\u5c55\u7684\u65b9\u5f0f\u6765\u5904\u7406\u6570\u636e\u3002\u901a\u8fc7\u4f20\u9012\u51fd\u6570\u6216\u65b9\u6cd5\uff0c\u6211\u4eec\u53ef\u4ee5\u5c06\u590d\u6742\u64cd\u4f5c\u7f29\u51cf\u4e3a\u4e00\u884c\u4ee3\u7801\uff0c\u4ece\u800c\u63d0\u9ad8\u4ee3\u7801\u7ef4\u62a4\u6027\u548c\u53ef\u91cd\u7528\u6027\u3002<\/p>\n
\u597d\u4e86\uff0c\u672c\u6587\u5230\u6b64\u7ed3\u675f\uff0c\u5e26\u5927\u5bb6\u4e86\u89e3\u4e86\u300aJava \u51fd\u6570\u548c Java \u65b9\u6cd5\u5728 Lambda \u8868\u8fbe\u5f0f\u4e2d\u7684\u5e94\u7528\u300b\uff0c\u5e0c\u671b\u672c\u6587\u5bf9\u4f60\u6709\u6240\u5e2e\u52a9\uff01\u5173\u6ce8\u516c\u4f17\u53f7\uff0c\u7ed9\u5927\u5bb6\u5206\u4eab\u66f4\u591a\u6587\u7ae0\u77e5\u8bc6\uff01<\/p>\n","protected":false},"excerpt":{"rendered":"
Java \u51fd\u6570\u548c Java \u65b9\u6cd5...<\/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-202789","post","type-post","status-publish","format-standard","hentry","category-4925"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/202789","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=202789"}],"version-history":[{"count":0,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/202789\/revisions"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=202789"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=202789"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=202789"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}