{"id":203028,"date":"2025-05-22T10:48:30","date_gmt":"2025-05-22T02:48:30","guid":{"rendered":"https:\/\/server.hk\/cnblog\/203028\/"},"modified":"2025-05-22T10:48:30","modified_gmt":"2025-05-22T02:48:30","slug":"%e5%a6%82%e4%bd%95%e5%9c%a8java%e4%b8%ad%e4%bd%bf%e7%94%a8lambda%e8%a1%a8%e8%be%be%e5%bc%8f%e8%bf%9b%e8%a1%8c%e5%b9%b6%e8%a1%8c%e7%bc%96%e7%a8%8b%ef%bc%9f","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/203028\/","title":{"rendered":"\u5982\u4f55\u5728Java\u4e2d\u4f7f\u7528Lambda\u8868\u8fbe\u5f0f\u8fdb\u884c\u5e76\u884c\u7f16\u7a0b\uff1f"},"content":{"rendered":"

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

\u5982\u4f55\u5728Java\u4e2d\u4f7f\u7528Lambda\u8868\u8fbe\u5f0f\u8fdb\u884c\u5e76\u884c\u7f16\u7a0b\uff1f<\/h1>\n

\u4e00\u5206\u8015\u8018\uff0c\u4e00\u5206\u6536\u83b7\uff01\u65e2\u7136\u6253\u5f00\u4e86\u8fd9\u7bc7\u6587\u7ae0\u300a\u5982\u4f55\u5728Java\u4e2d\u4f7f\u7528Lambda\u8868\u8fbe\u5f0f\u8fdb\u884c\u5e76\u884c\u7f16\u7a0b\uff1f\u300b<\/span>\uff0c\u5c31\u575a\u6301\u770b\u4e0b\u53bb\u5427\uff01\u6587\u4e2d\u5185\u5bb9\u5305\u542b<\/span>\u7b49\u7b49\u77e5\u8bc6\u70b9…\u5e0c\u671b\u4f60\u80fd\u5728\u9605\u8bfb\u672c\u6587\u540e\uff0c\u80fd\u771f\u771f\u5b9e\u5b9e\u5b66\u5230\u77e5\u8bc6\u6216\u8005\u5e2e\u4f60\u89e3\u51b3\u5fc3\u4e2d\u7684\u7591\u60d1\uff0c\u4e5f\u6b22\u8fce\u5927\u4f6c\u6216\u8005\u65b0\u4eba\u670b\u53cb\u4eec\u591a\u7559\u8a00\u8bc4\u8bba\uff0c\u591a\u7ed9\u5efa\u8bae\uff01\u8c22\u8c22\uff01<\/p>\n

<\/p>\n

\u5982\u4f55\u5728 Java \u4e2d\u4f7f\u7528 Lambda \u8868\u8fbe\u5f0f\u8fdb\u884c\u5e76\u884c\u7f16\u7a0b<\/strong><\/p>\n

Lambda \u8868\u8fbe\u5f0f\u4e3a Java 8 \u53ca\u66f4\u9ad8\u7248\u672c\u63d0\u4f9b\u4e86\u7b80\u5316\u548c\u7f16\u5199\u5e76\u884c\u4ee3\u7801\u7684\u5f3a\u5927\u65b9\u6cd5\u3002\u5b83\u5141\u8bb8\u5728\u4e0d\u521b\u5efa\u5355\u72ec\u7ebf\u7a0b\u7684\u60c5\u51b5\u4e0b\u5bf9\u96c6\u5408\u8fdb\u884c\u591a\u7ebf\u7a0b\u64cd\u4f5c\u3002<\/p>\n

1. Stream API<\/strong><\/p>\n

Java \u4e2d\u7684 Stream API \u63d0\u4f9b\u4e86\u8bb8\u591a\u7528\u4e8e\u5bf9\u96c6\u5408\u8fdb\u884c\u5e76\u884c\u64cd\u4f5c\u7684\u65b9\u6cd5\u3002\u8981\u542f\u7528\u5e76\u884c\u5316\uff0c\u60a8\u9700\u8981\u4f7f\u7528 parallel()<\/code> \u65b9\u6cd5\uff0c\u5982\u4e0b\u6240\u793a\uff1a<\/p>\n

List<Integer> numbers = Arrays.asList(1, 2, 3, 4, 5, 6, 7, 8, 9, 10);\n\n\/\/ \u5e76\u884c\u5904\u7406\u5217\u8868\nnumbers.parallelStream()\n    .forEach(System.out::println);<\/pre>\n
2. Fork\/Join Framework<\/strong><\/p>\n
Fork\/Join \u6846\u67b6\u53ef\u7528\u4e8e\u89e3\u51b3\u66f4\u590d\u6742\u7684\u4efb\u52a1\uff0c\u4f8b\u5982\u5206\u800c\u6cbb\u4e4b\u7b97\u6cd5\u3002\u5b83\u63d0\u4f9b\u4e86\u4e00\u4e2a ForkJoinPool<\/code> \u7c7b\uff0c\u5141\u8bb8\u591a\u7ebf\u7a0b\u6267\u884c\u4efb\u52a1\uff1a<\/p>\n
\/\/ \u521b\u5efa\u4efb\u52a1\u6765\u8ba1\u7b97\u6bcf\u4e2a\u6570\u5b57\u7684\u5e73\u65b9\nList<Integer> numbers = Arrays.asList(1, 2, 3, 4, 5, 6, 7, 8, 9, 10);\nFunction<Integer, Integer> squareFunc = (n) -> n * n;\n\n\/\/ \u63d0\u4ea4\u4efb\u52a1\u5230 Fork\/Join \u6c60\nForkJoinPool pool = new ForkJoinPool();\nList<Integer> squaredNumbers = pool.invokeAll(numbers.stream()\n    .map(squareFunc)\n    .toList());<\/pre>\n
\u5b9e\u6218\u6848\u4f8b\uff1a\u5e76\u884c\u8ba1\u7b97\u6587\u4ef6\u54c8\u5e0c\u503c<\/strong><\/p>\n
\u5047\u8bbe\u60a8\u6709\u4e00\u4e2a\u5305\u542b\u591a\u4e2a\u6587\u4ef6\u7684\u5927\u578b\u6587\u4ef6\u5939\uff0c\u5e76\u4e14\u9700\u8981\u5feb\u901f\u8ba1\u7b97\u5b83\u4eec\u7684\u54c8\u5e0c\u503c\u3002\u60a8\u53ef\u4ee5\u5e76\u884c\u5316\u6b64\u8fc7\u7a0b\u4ee5\u663e\u7740\u63d0\u9ad8\u6027\u80fd\uff1a<\/p>\n
import java.io.File;\nimport java.nio.file.Files;\nimport java.nio.file.Path;\nimport java.nio.file.Paths;\nimport java.security.MessageDigest;\n\npublic class FileHashing {\n\n    public static void main(String[] args) throws Exception {\n        \/\/ \u83b7\u53d6\u6587\u4ef6\u5939\u4e2d\u6240\u6709\u6587\u4ef6\n        File folder = new File(\".\");\n        File[] files = folder.listFiles();\n\n        \/\/ \u5e76\u884c\u8ba1\u7b97\u6587\u4ef6\u7684\u54c8\u5e0c\u503c\n        Path rootPath = Paths.get(\"\");\n        String[] hashes = Arrays.parallelStream(files)\n            .map(File::toPath)\n            .map(path -> {\n                try {\n                    byte[] fileContent = Files.readAllBytes(path);\n                    MessageDigest md5 = MessageDigest.getInstance(\"MD5\");\n                    return ByteUtils.bytesToHex(md5.digest(fileContent));\n                } catch (Exception e) {\n                    return e.getMessage();\n                }\n            })\n            .toArray(String[]::new);\n\n        \/\/ \u6253\u5370\u54c8\u5e0c\u503c\n        for (String hash : hashes) {\n            System.out.println(hash);\n        }\n    }\n}<\/pre>\n
\u4ee5\u4e0a\u5c31\u662f\u672c\u6587\u7684\u5168\u90e8\u5185\u5bb9\u4e86\uff0c\u662f\u5426\u6709\u987a\u5229\u5e2e\u52a9\u4f60\u89e3\u51b3\u95ee\u9898\uff1f\u82e5\u662f\u80fd\u7ed9\u4f60\u5e26\u6765\u5b66\u4e60\u4e0a\u7684\u5e2e\u52a9\uff0c\u8bf7\u5927\u5bb6\u591a\u591a\u652f\u6301\uff01\u66f4\u591a\u5173\u4e8e\u6587\u7ae0\u7684\u76f8\u5173\u77e5\u8bc6\uff0c\u4e5f\u53ef\u5173\u6ce8\u516c\u4f17\u53f7\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"
\u5982\u4f55\u5728Java\u4e2d\u4f7f\u7528Lambda...<\/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-203028","post","type-post","status-publish","format-standard","hentry","category-4925"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/203028","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=203028"}],"version-history":[{"count":0,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/203028\/revisions"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=203028"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=203028"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=203028"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}