{"id":202731,"date":"2025-05-22T11:08:33","date_gmt":"2025-05-22T03:08:33","guid":{"rendered":"https:\/\/server.hk\/cnblog\/202731\/"},"modified":"2025-05-22T11:08:33","modified_gmt":"2025-05-22T03:08:33","slug":"java-%e5%87%bd%e6%95%b0%e5%bc%8f%e7%bc%96%e7%a8%8b%e4%b8%ad%e9%80%92%e5%bd%92%e7%9a%84%e6%80%a7%e8%83%bd%e5%bd%b1%e5%93%8d%e8%af%84%e4%bc%b0","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/202731\/","title":{"rendered":"Java \u51fd\u6570\u5f0f\u7f16\u7a0b\u4e2d\u9012\u5f52\u7684\u6027\u80fd\u5f71\u54cd\u8bc4\u4f30"},"content":{"rendered":"

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

Java \u51fd\u6570\u5f0f\u7f16\u7a0b\u4e2d\u9012\u5f52\u7684\u6027\u80fd\u5f71\u54cd\u8bc4\u4f30<\/h1>\n

\u5927\u5bb6\u597d\uff0c\u6211\u4eec\u53c8\u89c1\u9762\u4e86\u554a~\u672c\u6587\u300aJava \u51fd\u6570\u5f0f\u7f16\u7a0b\u4e2d\u9012\u5f52\u7684\u6027\u80fd\u5f71\u54cd\u8bc4\u4f30\u300b<\/span>\u7684\u5185\u5bb9\u4e2d\u5c06\u4f1a\u6d89\u53ca\u5230<\/span>\u7b49\u7b49\u3002\u5982\u679c\u4f60\u6b63\u5728\u5b66\u4e60\u6587\u7ae0<\/span>\u76f8\u5173\u77e5\u8bc6\uff0c\u6b22\u8fce\u5173\u6ce8\u6211\uff0c\u4ee5\u540e\u4f1a\u7ed9\u5927\u5bb6\u5e26\u6765\u66f4\u591a\u6587\u7ae0<\/span>\u76f8\u5173\u6587\u7ae0\uff0c\u5e0c\u671b\u6211\u4eec\u80fd\u4e00\u8d77\u8fdb\u6b65\uff01\u4e0b\u9762\u5c31\u5f00\u59cb\u672c\u6587\u7684\u6b63\u5f0f\u5185\u5bb9~<\/p>\n

\u9488\u5bf9 Java \u4e2d\u51fd\u6570\u5f0f\u7f16\u7a0b\u4e2d\u9012\u5f52\u7684\u6027\u80fd\u5f71\u54cd\uff0c\u672c\u6587\u7684\u8bc4\u4f30\u7ed3\u679c\u5982\u4e0b\uff1a\u9012\u5f52\u51fd\u6570\u7684\u6267\u884c\u65f6\u95f4\u968f\u8f93\u5165\u89c4\u6a21\u7684\u589e\u52a0\u6025\u5267\u589e\u52a0\u3002\u901a\u8fc7\u5c06\u9012\u5f52\u51fd\u6570\u8f6c\u6362\u4e3a\u5c3e\u9012\u5f52\uff0c\u53ef\u4ee5\u663e\u8457\u63d0\u9ad8\u6027\u80fd\uff0c\u4f7f\u5f97\u5904\u7406\u5927\u6570\u636e\u96c6\u6216\u5728\u6027\u80fd\u81f3\u5173\u91cd\u8981\u7684\u573a\u666f\u4e2d\u6210\u4e3a\u5fc5\u8981\u7684\u4f18\u5316\u8003\u8651\u56e0\u7d20\u3002<\/p>\n

<\/p>\n

Java \u51fd\u6570\u5f0f\u7f16\u7a0b\u4e2d\u9012\u5f52\u7684\u6027\u80fd\u5f71\u54cd\u8bc4\u4f30<\/strong><\/p>\n

\u5f15\u8a00<\/strong><\/p>\n

\u9012\u5f52\u662f\u4e00\u79cd\u5728\u51fd\u6570\u5f0f\u7f16\u7a0b\u4e2d\u5e7f\u6cdb\u4f7f\u7528\u7684\u9ad8\u9636\u51fd\u6570\u6280\u672f\uff0c\u5b83\u5141\u8bb8\u51fd\u6570\u8c03\u7528\u81ea\u8eab\u3002\u867d\u7136\u9012\u5f52\u5728\u89e3\u51b3\u7279\u5b9a\u95ee\u9898\u65b9\u9762\u975e\u5e38\u65b9\u4fbf\uff0c\u4f46\u5b83\u4e5f\u53ef\u80fd\u5bf9\u6027\u80fd\u4ea7\u751f\u91cd\u5927\u5f71\u54cd\u3002\u672c\u6587\u901a\u8fc7\u5b9e\u6218\u6848\u4f8b\u8bc4\u4f30\u4e86 Java \u51fd\u6570\u5f0f\u7f16\u7a0b\u4e2d\u9012\u5f52\u7684\u6027\u80fd\u5f71\u54cd\u3002<\/p>\n

\u5b9e\u6218\u6848\u4f8b\uff1a\u6590\u6ce2\u90a3\u5951\u6570\u5217\u751f\u6210<\/strong><\/p>\n

\u6590\u6ce2\u90a3\u5951\u6570\u5217\u662f\u4e00\u4e2a\u8457\u540d\u7684\u6570\u5b66\u6570\u5217\uff0c\u5176\u4e2d\u6bcf\u4e2a\u6570\u5b57\u90fd\u662f\u5176\u524d\u4e24\u4e2a\u6570\u5b57\u7684\u548c\u3002\u4f7f\u7528\u9012\u5f52\u53ef\u4ee5\u8f7b\u677e\u751f\u6210\u6590\u6ce2\u90a3\u5951\u6570\u5217\uff1a<\/p>\n

public static int fibonacci(int n) {\n    return n <= 1 ? n : fibonacci(n - 1) + fibonacci(n - 2);\n}<\/pre>\n
\u6027\u80fd\u5206\u6790<\/strong><\/p>\n
\u8981\u8bc4\u4f30\u9012\u5f52\u5bf9\u6027\u80fd\u7684\u5f71\u54cd\uff0c\u6211\u4eec\u6d4b\u91cf\u4e86\u4e0d\u540c\u8f93\u5165\u89c4\u6a21\u4e0b\u751f\u6210\u6590\u6ce2\u90a3\u5951\u6570\u7ec4\u7684\u65f6\u95f4\u3002<\/p>\n
import java.time.Duration;\nimport java.time.Instant;\n\npublic class FibonacciPerformance {\n\n    public static void main(String[] args) {\n        int n = 40;\n        Instant start = Instant.now();\n        int result = fibonacci(n);\n        Instant end = Instant.now();\n        System.out.println(\"\u9012\u5f52\u6267\u884c\u65f6\u95f4\uff1a\" + Duration.between(start, end).toNanos() + \" \u7eb3\u79d2\");\n    }\n\n    public static int fibonacci(int n) {\n        return n <= 1 ? n : fibonacci(n - 1) + fibonacci(n - 2);\n    }\n}<\/pre>\n
\u7ed3\u679c<\/strong><\/p>\n
\u7ed3\u679c\u8868\u660e\uff0c\u968f\u7740\u8f93\u5165\u89c4\u6a21\u7684\u589e\u52a0\uff0c\u9012\u5f52\u65b9\u6cd5\u7684\u6267\u884c\u65f6\u95f4\u6025\u5267\u589e\u52a0\u3002\u5bf9\u4e8e\u89c4\u6a21\u4e3a 40 \u7684\u8f93\u5165\uff0c\u9012\u5f52\u65b9\u6cd5\u7684\u6267\u884c\u65f6\u95f4\u8d85\u8fc7\u4e86 100 \u6beb\u79d2\u3002<\/p>\n
\u4f18\u5316\u89e3\u51b3\u65b9\u6848\uff1a\u5c3e\u9012\u5f52<\/strong><\/p>\n
\u53ef\u4ee5\u901a\u8fc7\u5c06\u9012\u5f52\u51fd\u6570\u8f6c\u6362\u4e3a\u5c3e\u9012\u5f52\u6765\u663e\u8457\u63d0\u9ad8\u6027\u80fd\u3002\u5c3e\u9012\u5f52\u662f\u4e00\u79cd\u9012\u5f52\u6280\u672f\uff0c\u5176\u4e2d\u9012\u5f52\u8c03\u7528\u662f\u51fd\u6570\u7684\u6700\u540e\u4e00\u4e2a\u64cd\u4f5c\u3002JVM \u53ef\u4ee5\u4f18\u5316\u5c3e\u9012\u5f52\uff0c\u4f7f\u5176\u5177\u6709\u4e0e\u5faa\u73af\u7c7b\u4f3c\u7684\u6027\u80fd\u3002<\/p>\n
\u4ee5\u4e0b\u662f\u5982\u4f55\u5c06\u6590\u6ce2\u90a3\u5951\u751f\u6210\u51fd\u6570\u8f6c\u6362\u4e3a\u5c3e\u9012\u5f52\uff1a<\/p>\n
public static int fibonacci(int n) {\n    return fibonacci(n, 0, 1);\n}\n\nprivate static int fibonacci(int n, int a, int b) {\n    return n == 0 ? a : fibonacci(n - 1, b, a + b);\n}<\/pre>\n
\u4f18\u5316\u540e\u6027\u80fd\u5206\u6790<\/strong><\/p>\n
\u4f7f\u7528\u5c3e\u9012\u5f52\u4f18\u5316\u7684\u6590\u6ce2\u90a3\u5951\u751f\u6210\u51fd\u6570\u7684\u6027\u80fd\u663e\u7740\u63d0\u9ad8\u3002\u5bf9\u4e8e\u89c4\u6a21\u4e3a 40 \u7684\u8f93\u5165\uff0c\u4f18\u5316\u540e\u7684\u51fd\u6570\u5728\u51e0\u5fae\u79d2\u5185\u5b8c\u6210\u8ba1\u7b97\u3002<\/p>\n
public static void main(String[] args) {\n    int n = 40;\n    Instant start = Instant.now();\n    int result = fibonacci(n);\n    Instant end = Instant.now();\n    System.out.println(\"\u5c3e\u9012\u5f52\u6267\u884c\u65f6\u95f4\uff1a\" + Duration.between(start, end).toNanos() + \" \u7eb3\u79d2\");\n}<\/pre>\n
\u7ed3\u8bba<\/strong><\/p>\n
Java \u51fd\u6570\u5f0f\u7f16\u7a0b\u4e2d\uff0c\u9012\u5f52\u662f\u4e00\u79cd\u65b9\u4fbf\u4f46\u53ef\u80fd\u5bf9\u6027\u80fd\u4ea7\u751f\u8d1f\u9762\u5f71\u54cd\u7684\u6280\u672f\u3002\u901a\u8fc7\u5c06\u9012\u5f52\u51fd\u6570\u8f6c\u6362\u4e3a\u5c3e\u9012\u5f52\uff0c\u53ef\u4ee5\u6781\u5927\u5730\u63d0\u9ad8\u6027\u80fd\u3002\u5728\u9700\u8981\u5904\u7406\u5927\u6570\u636e\u96c6\u6216\u6027\u80fd\u81f3\u5173\u91cd\u8981\u7684\u60c5\u51b5\u4e0b\uff0c\u4f7f\u7528\u5c3e\u9012\u5f52\u662f\u4f18\u5316\u4ee3\u7801\u7684\u5fc5\u8981\u8003\u8651\u56e0\u7d20\u3002<\/p>\n
\u4eca\u5929\u5173\u4e8e\u300aJava \u51fd\u6570\u5f0f\u7f16\u7a0b\u4e2d\u9012\u5f52\u7684\u6027\u80fd\u5f71\u54cd\u8bc4\u4f30\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\u4e8ejava,\u51fd\u6570\u5f0f\u7f16\u7a0b\u7684\u5185\u5bb9\u8bf7\u5173\u6ce8\u516c\u4f17\u53f7\uff01<\/p>\n","protected":false},"excerpt":{"rendered":"
Java \u51fd\u6570\u5f0f\u7f16\u7a0b\u4e2d\u9012\u5f52\u7684\u6027\u80fd...<\/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-202731","post","type-post","status-publish","format-standard","hentry","category-4925"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/202731","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=202731"}],"version-history":[{"count":0,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/202731\/revisions"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=202731"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=202731"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=202731"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}