{"id":202546,"date":"2025-05-22T08:52:45","date_gmt":"2025-05-22T00:52:45","guid":{"rendered":"https:\/\/server.hk\/cnblog\/202546\/"},"modified":"2025-05-22T08:52:45","modified_gmt":"2025-05-22T00:52:45","slug":"java-8-%e4%b8%ad%e7%9a%84%e5%87%bd%e6%95%b0%e5%bc%8f%e7%bc%96%e7%a8%8b%e7%89%b9%e6%80%a7","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/202546\/","title":{"rendered":"Java 8 \u4e2d\u7684\u51fd\u6570\u5f0f\u7f16\u7a0b\u7279\u6027"},"content":{"rendered":"

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

Java 8 \u4e2d\u7684\u51fd\u6570\u5f0f\u7f16\u7a0b\u7279\u6027<\/h1>\n

\u4eca\u65e5\u4e0d\u80af\u57cb\u5934\uff0c\u660e\u65e5\u4f55\u4ee5\u62ac\u5934\uff01\u6bcf\u65e5\u4e00\u53e5\u52aa\u529b\u81ea\u5df1\u7684\u8bdd\u54c8\u54c8~\u54c8\u55bd\uff0c\u4eca\u5929\u6211\u5c06\u7ed9\u5927\u5bb6\u5e26\u6765\u4e00\u7bc7\u300aJava 8 \u4e2d\u7684\u51fd\u6570\u5f0f\u7f16\u7a0b\u7279\u6027\u300b<\/span>\uff0c\u4e3b\u8981\u5185\u5bb9\u662f\u8bb2\u89e3<\/span>\u7b49\u7b49\uff0c\u611f\u5174\u8da3\u7684\u670b\u53cb\u53ef\u4ee5\u6536\u85cf\u6216\u8005\u6709\u66f4\u597d\u7684\u5efa\u8bae\u5728\u8bc4\u8bba\u63d0\u51fa\uff0c\u6211\u90fd\u4f1a\u8ba4\u771f\u770b\u7684\uff01\u5927\u5bb6\u4e00\u8d77\u8fdb\u6b65\uff0c\u4e00\u8d77\u5b66\u4e60\uff01<\/p>\n

Java 8 \u4e2d\u7684\u51fd\u6570\u5f0f\u7f16\u7a0b\u7279\u6027\u5305\u62ec\uff1a\u51fd\u6570\u5f0f\u63a5\u53e3\uff1a\u5141\u8bb8\u5c06\u884c\u4e3a\u4f5c\u4e3a\u53c2\u6570\u4f20\u9012\uff0c\u5c31\u50cf\u8bed\u8a00\u4e2d\u7684\u4e00\u7b49\u516c\u6c11\u4e00\u6837\u3002lambda \u8868\u8fbe\u5f0f\uff1a\u7b80\u77ed\u7684\u533f\u540d\u51fd\u6570\uff0c\u53ef\u4ee5\u4f20\u9012\u7ed9\u51fd\u6570\u5f0f\u63a5\u53e3\u4f5c\u4e3a\u53c2\u6570\u3002\u65b9\u6cd5\u5f15\u7528\uff1a\u7b80\u6d01\u7684 lambda \u8868\u8fbe\u5f0f\u8bed\u6cd5\uff0c\u5141\u8bb8\u5f15\u7528\u73b0\u6709\u7684\u65b9\u6cd5\u3002\u6d41 API\uff1a\u63d0\u4f9b\u4e00\u81f4\u4e14\u5f3a\u5927\u7684\u65b9\u5f0f\u6765\u5904\u7406\u96c6\u5408\u5143\u7d20\uff0c\u652f\u6301\u8f6c\u6362\u3001\u8fc7\u6ee4\u548c\u805a\u5408\u6570\u636e\u3002<\/p>\n

<\/p>\n

Java 8 \u4e2d\u7684\u51fd\u6570\u5f0f\u7f16\u7a0b\u7279\u6027<\/strong><\/p>\n

Java 8 \u5f15\u5165\u4e86\u8bb8\u591a\u51fd\u6570\u5f0f\u7f16\u7a0b\u7279\u6027\uff0c\u4f7f\u5176\u6210\u4e3a\u4e00\u79cd\u66f4\u52a0\u5f3a\u5927\u7684\u8bed\u8a00\uff0c\u53ef\u4ee5\u7f16\u5199\u66f4\u7b80\u6d01\u3001\u66f4\u58f0\u660e\u6027\u7684\u4ee3\u7801\u3002<\/p>\n

\u51fd\u6570\u5f0f\u63a5\u53e3<\/strong><\/p>\n

\u51fd\u6570\u5f0f\u63a5\u53e3\u662f\u4e00\u79cd\u53ea\u5305\u542b\u4e00\u4e2a\u62bd\u8c61\u65b9\u6cd5\u7684\u63a5\u53e3\u3002\u5b83\u5141\u8bb8\u5c06\u884c\u4e3a\u4f5c\u4e3a\u53c2\u6570\u4f20\u9012\uff0c\u5c31\u50cf Java \u4e2d\u7684\u4e00\u7b49\u516c\u6c11\u4e00\u6837\u3002\u4f8b\u5982\uff0cPredicate<\/code> \u63a5\u53e3\u8868\u793a\u4e00\u4e2a\u63a5\u53d7\u4e00\u4e2a\u53c2\u6570\u5e76\u8fd4\u56de boolean<\/strong> \u503c\u7684\u51fd\u6570\uff1a<\/p>\n

import java.util.List;\nimport java.util.function.Predicate;\n\npublic class FunctionInterfaceExample {\n\n    public static void main(String[] args) {\n        List<String> names = List.of(\"Alice\", \"Bob\", \"Eve\");\n\n        \/\/ \u4f7f\u7528\u533f\u540d\u5185\u90e8\u7c7b\u5b9e\u73b0 Predicate\n        Predicate<String> startsWithA = new Predicate<>() {\n            @Override\n            public boolean test(String s) {\n                return s.startsWith(\"A\");\n            }\n        };\n\n        \/\/ \u8fc7\u6ee4\u4ee5 A \u5f00\u5934\u7684\u540d\u79f0\n        List<String> filteredNames = filter(names, startsWithA);\n\n        \/\/ \u6253\u5370\u7ed3\u679c\n        System.out.println(filteredNames); \/\/ [Alice]\n    }\n\n    private static <T> List<T> filter(List<T> list, Predicate<T> predicate) {\n        List<T> result = new ArrayList<>();\n        for (T element : list) {\n            if (predicate.test(element)) {\n                result.add(element);\n            }\n        }\n        return result;\n    }\n}<\/pre>\n
lambda \u8868\u8fbe\u5f0f<\/strong><\/p>\n
lambda \u8868\u8fbe\u5f0f\u5141\u8bb8\u7f16\u5199\u7b80\u77ed\u7684\u533f\u540d\u51fd\u6570\uff0c\u53ef\u4ee5\u4f5c\u4e3a\u51fd\u6570\u5f0f\u63a5\u53e3\u7684\u53c2\u6570\u4f20\u9012\u3002\u4ee5\u4e0b\u4ee3\u7801\u5c55\u793a\u5982\u4f55\u4f7f\u7528 lambda \u8868\u8fbe\u5f0f\u5b9e\u73b0\u4e0a\u9762\u7684 startsWithA<\/code> Predicate\uff1a<\/p>\n
Predicate<String> startsWithA = s -> s.startsWith(\"A\");<\/pre>\n
\u65b9\u6cd5\u5f15\u7528<\/strong><\/p>\n
\u65b9\u6cd5\u5f15\u7528\u662f\u4e00\u79cd\u66f4\u7b80\u6d01\u7684 lambda \u8868\u8fbe\u5f0f\u8bed\u6cd5\uff0c\u5b83\u5141\u8bb8\u5f15\u7528\u73b0\u6709\u7684\u65b9\u6cd5\u3002\u4ee5\u4e0b\u4ee3\u7801\u5c55\u793a\u5982\u4f55\u4f7f\u7528\u65b9\u6cd5\u5f15\u7528\u5b9e\u73b0 startsWithA<\/code> Predicate\uff1a<\/p>\n
Predicate<String> startsWithA = String::startsWith;<\/pre>\n
\u6d41 API<\/strong><\/p>\n
\u6d41 API \u63d0\u4f9b\u4e86\u4e00\u4e2a\u4e00\u81f4\u4e14\u5f3a\u5927\u7684\u65b9\u5f0f\u6765\u5904\u7406\u96c6\u5408\u5143\u7d20\u3002\u6d41\u8868\u793a\u5143\u7d20\u7684\u5e8f\u5217\uff0c\u53ef\u4ee5\u8fdb\u884c\u5404\u79cd\u64cd\u4f5c\u6765\u8f6c\u6362\u3001\u8fc7\u6ee4\u548c\u805a\u5408\u6570\u636e\u3002\u4ee5\u4e0b\u4ee3\u7801\u5c55\u793a\u5982\u4f55\u4f7f\u7528\u6d41 API \u8fc7\u6ee4\u5e76\u6253\u5370\u4ee5 A \u5f00\u5934\u7684\u540d\u79f0\uff1a<\/p>\n
names.stream()\n        .filter(s -> s.startsWith(\"A\"))\n        .forEach(System.out::println);<\/pre>\n
\u7ed3\u8bba<\/strong><\/p>\n
Java 8 \u4e2d\u7684\u51fd\u6570\u5f0f\u7f16\u7a0b\u7279\u6027\u6781\u5927\u5730\u63d0\u9ad8\u4e86\u7f16\u5199\u7b80\u6d01\u3001\u58f0\u660e\u6027\u4ee3\u7801\u7684\u80fd\u529b\u3002\u51fd\u6570\u5f0f\u63a5\u53e3\u3001lambda \u8868\u8fbe\u5f0f\u3001\u65b9\u6cd5\u5f15\u7528\u548c\u6d41 API \u5141\u8bb8\u5f00\u53d1\u4eba\u5458\u4e13\u6ce8\u4e8e\u4e1a\u52a1\u903b\u8f91\uff0c\u800c\u4e0d\u662f\u4f4e\u7ea7\u7ec6\u8282\u3002<\/p>\n
\u597d\u4e86\uff0c\u672c\u6587\u5230\u6b64\u7ed3\u675f\uff0c\u5e26\u5927\u5bb6\u4e86\u89e3\u4e86\u300aJava 8 \u4e2d\u7684\u51fd\u6570\u5f0f\u7f16\u7a0b\u7279\u6027\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 8 \u4e2d\u7684\u51fd\u6570\u5f0f\u7f16\u7a0b\u7279\u6027...<\/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-202546","post","type-post","status-publish","format-standard","hentry","category-4925"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/202546","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=202546"}],"version-history":[{"count":0,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/202546\/revisions"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=202546"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=202546"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=202546"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}