{"id":54126,"date":"2023-09-18T20:03:00","date_gmt":"2023-09-18T12:03:00","guid":{"rendered":"https:\/\/docs.pingcode.com\/?p=54126"},"modified":"2023-09-18T20:03:02","modified_gmt":"2023-09-18T12:03:02","slug":"java%e6%ba%90%e7%a0%81%e7%94%a8%e7%b1%bb%e4%bc%bca-b0%e7%9a%84%e5%86%99%e6%b3%95%ef%bc%8c%e5%92%8cab%e6%9c%89%e4%bb%80%e4%b9%88%e5%8c%ba%e5%88%ab","status":"publish","type":"post","link":"https:\/\/docs.pingcode.com\/ask\/54126.html","title":{"rendered":"java\u6e90\u7801\u7528\u7c7b\u4f3ca-b&gt;0\u7684\u5199\u6cd5\uff0c\u548ca&gt;b\u6709\u4ec0\u4e48\u533a\u522b"},"content":{"rendered":"\n<blockquote class=\"wp-block-quote\">\n<p>Java\u6e90\u7801\u4e2d\u7ecf\u5e38\u770b\u5230\u7c7b\u4f3ca-b&gt;0\u8fd9\u6837\u7684\u5199\u6cd5\uff0c\u800c\u4e0d\u662f\u76f4\u63a5\u4f7f\u7528a&gt;b\u3002\u8fd9\u79cd\u5199\u6cd5\u4e0e\u76f4\u63a5\u7684\u6bd4\u8f83\u6709\u5176\u7279\u5b9a\u7684\u7528\u5904\u548c\u5dee\u5f02\uff0c\u4e3b\u8981\u6d89\u53ca\uff1a1\u3001\u6570\u503c\u7684\u8fb9\u754c\u548c\u6ea2\u51fa\u5904\u7406\uff1b2\u3001\u4ee3\u7801\u7684\u53ef\u8bfb\u6027\u548c\u6e05\u6670\u6027\uff1b3\u3001\u4e0eJava\u6807\u51c6\u5e93\u7684\u4e00\u81f4\u6027\uff1b4\u3001\u6027\u80fd\u548c\u4f18\u5316\u3002<\/p>\n<\/blockquote>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-full\"><img fetchpriority=\"high\" decoding=\"async\" width=\"680\" height=\"421\" src=\"https:\/\/cdn-docs.pingcode.com\/wp-content\/uploads\/2023\/09\/680-59.jpg?x-oss-process=image\/auto-orient,1\/format,webp\" alt=\"\" class=\"wp-image-54127\" \/><\/figure><\/div>\n\n\n<h2 class=\"wp-block-heading\">1\u3001\u6570\u503c\u7684\u8fb9\u754c\u548c\u6ea2\u51fa\u5904\u7406<\/h2>\n\n\n\n<ul>\n<li>\u5728\u8fdb\u884c\u6574\u6570\u8ba1\u7b97\u65f6\uff0c\u7279\u522b\u662f\u6d89\u53ca\u5927\u6574\u6570\uff0c\u76f4\u63a5\u8fdb\u884c\u51cf\u6cd5\u64cd\u4f5c\u53ef\u80fd\u4f1a\u5bfc\u81f4\u6ea2\u51fa\u3002\u4f7f\u7528a-b&gt;0\u7684\u5199\u6cd5\u53ef\u4ee5\u5e2e\u52a9\u5f00\u53d1\u8005\u66f4\u6e05\u6670\u5730\u7406\u89e3\u548c\u5904\u7406\u8fd9\u79cd\u60c5\u51b5\u3002<\/li>\n\n\n\n<li>\u4f8b\u5982\uff0c\u8003\u8651Integer.MAX_VALUE\u548cInteger.MIN_VALUE\uff0c\u4f7f\u7528a&gt;b\u53ef\u80fd\u4e0d\u4f1a\u76f4\u63a5\u53cd\u6620\u51fa\u6574\u6570\u8fb9\u754c\u95ee\u9898\uff0c\u800ca-b\u7684\u5199\u6cd5\u4f1a\u66f4\u52a0\u660e\u786e\u3002<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">2\u3001\u4ee3\u7801\u7684\u53ef\u8bfb\u6027\u548c\u6e05\u6670\u6027<\/h2>\n\n\n\n<ul>\n<li>\u5bf9\u4e8e\u67d0\u4e9b\u590d\u6742\u7684\u903b\u8f91\u6216\u7b97\u6cd5\uff0c\u4f7f\u7528a-b&gt;0\u7684\u5199\u6cd5\u53ef\u4ee5\u63d0\u9ad8\u4ee3\u7801\u7684\u6e05\u6670\u5ea6\u548c\u53ef\u8bfb\u6027\u3002<\/li>\n\n\n\n<li>\u8fd9\u79cd\u5199\u6cd5\u4e5f\u53ef\u4ee5\u4f7f\u4ee3\u7801\u66f4\u5177\u63cf\u8ff0\u6027\uff0c\u6bd4\u5982\u5728\u6bd4\u8f83\u4e24\u4e2a\u65e5\u671f\u65f6\uff0ca-b\u53ef\u80fd\u8868\u793a\u4e24\u4e2a\u65e5\u671f\u4e4b\u95f4\u7684\u5929\u6570\u5dee\u3002<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">3\u3001\u4e0eJava\u6807\u51c6\u5e93\u7684\u4e00\u81f4\u6027<\/h2>\n\n\n\n<ul>\n<li>Java\u6807\u51c6\u5e93\u4e2d\uff0c\u5982<code>Comparator<\/code>\u63a5\u53e3\uff0c\u7ecf\u5e38\u4f7f\u7528a-b\u7684\u5f62\u5f0f\u8fdb\u884c\u6bd4\u8f83\u3002\u8fd9\u6837\u505a\u53ef\u4ee5\u786e\u4fdd\u4e0e\u5e93\u7684\u5176\u4ed6\u90e8\u5206\u4fdd\u6301\u4e00\u81f4\u6027\u3002<\/li>\n\n\n\n<li>\u8fd9\u79cd\u65b9\u6cd5\u53ef\u4ee5\u8fd4\u56de\u4e09\u79cd\u503c\uff1a\u8d1f\u6570\u3001\u96f6\u548c\u6b63\u6570\uff0c\u5206\u522b\u8868\u793a\u5c0f\u4e8e\u3001\u7b49\u4e8e\u548c\u5927\u4e8e\uff0c\u8fd9\u6bd4\u7b80\u5355\u7684true\/false\u63d0\u4f9b\u4e86\u66f4\u591a\u7684\u4fe1\u606f\u3002<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">4\u3001\u6027\u80fd\u548c\u4f18\u5316<\/h2>\n\n\n\n<ul>\n<li>\u5728\u67d0\u4e9b\u60c5\u51b5\u4e0b\uff0c\u4f7f\u7528a-b\u7684\u5199\u6cd5\u53ef\u80fd\u6bd4\u76f4\u63a5\u6bd4\u8f83a\u548cb\u66f4\u5feb\uff0c\u56e0\u4e3aJVM\u548c\u786c\u4ef6\u53ef\u80fd\u5bf9\u8fd9\u79cd\u64cd\u4f5c\u8fdb\u884c\u4e86\u4f18\u5316\u3002<\/li>\n\n\n\n<li>\u4f46\u8fd9\u5e76\u4e0d\u662f\u7edd\u5bf9\u7684\uff0c\u5b9e\u9645\u7684\u6027\u80fd\u4f1a\u6839\u636e\u5177\u4f53\u7684JVM\u5b9e\u73b0\u548c\u786c\u4ef6\u73af\u5883\u800c\u5f02\u3002<\/li>\n<\/ul>\n\n\n\n<p>\u7ed3\u8bba\uff1a\u4f7f\u7528a-b&gt;0\u7684\u5199\u6cd5\u5728Java\u4e2d\u5e76\u4e0d\u662f\u65e0\u7f18\u65e0\u6545\u7684\u3002\u5b83\u53ef\u4ee5\u63d0\u4f9b\u66f4\u597d\u7684\u6570\u503c\u8fb9\u754c\u5904\u7406\uff0c\u589e\u5f3a\u4ee3\u7801\u7684\u53ef\u8bfb\u6027\u548c\u4e00\u81f4\u6027\uff0c\u5e76\u53ef\u80fd\u5e26\u6765\u6027\u80fd\u4e0a\u7684\u4f18\u52bf\u3002\u7136\u800c\uff0c\u5f00\u53d1\u8005\u5728\u4f7f\u7528\u65f6\u4ecd\u9700\u8981\u6743\u8861\u8fd9\u79cd\u5199\u6cd5\u4e0e\u76f4\u63a5\u6bd4\u8f83\u7684\u5dee\u5f02\uff0c\u5e76\u6839\u636e\u5b9e\u9645\u60c5\u51b5\u505a\u51fa\u9009\u62e9\u3002<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity is-style-wide\" \/>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>\u5e38\u89c1\u95ee\u7b54<\/strong><\/h2>\n\n\n\n<div class=\"wp-block-group is-vertical is-layout-flex wp-container-core-group-layout-1 wp-block-group-is-layout-flex\">\n<p><strong>Q1: \u5728Java\u4e2d\uff0c\u4e3a\u4ec0\u4e48\u6211\u4f1a\u770b\u5230\u50cfa-b&gt;0\u8fd9\u6837\u7684\u5199\u6cd5\uff0c\u800c\u4e0d\u662f\u7b80\u5355\u7684a&gt;b\uff1f<\/strong><\/p>\n\n\n\n<p><strong>A1:<\/strong> \u8fd9\u79cd\u5199\u6cd5\u6709\u591a\u4e2a\u76ee\u7684\u3002\u9996\u5148\uff0c\u5b83\u53ef\u4ee5\u63d0\u4f9b\u66f4\u597d\u7684\u6570\u503c\u8fb9\u754c\u5904\u7406\uff0c\u5c24\u5176\u662f\u5f53\u6d89\u53ca\u5230\u53ef\u80fd\u7684\u6574\u6570\u6ea2\u51fa\u65f6\u3002\u5176\u6b21\uff0c\u8fd9\u79cd\u5199\u6cd5\u5728\u67d0\u4e9b\u4e0a\u4e0b\u6587\u4e2d\u53ef\u4ee5\u63d0\u9ad8\u4ee3\u7801\u7684\u53ef\u8bfb\u6027\u3002\u6b64\u5916\uff0cJava\u6807\u51c6\u5e93\u4e2d\uff0c\u5982<code>Comparator<\/code>\u63a5\u53e3\uff0c\u7ecf\u5e38\u4f7f\u7528\u6b64\u79cd\u5f62\u5f0f\uff0c\u8fd9\u6709\u52a9\u4e8e\u4e0e\u6807\u51c6\u5e93\u7684\u5176\u4ed6\u90e8\u5206\u4fdd\u6301\u4e00\u81f4\u6027\u3002<\/p>\n<\/div>\n\n\n\n<div class=\"wp-block-group is-vertical is-layout-flex wp-container-core-group-layout-2 wp-block-group-is-layout-flex\">\n<p><strong>Q2: a-b&gt;0\u548ca&gt;b\u5728\u6027\u80fd\u4e0a\u6709\u4ec0\u4e48\u533a\u522b\uff1f<\/strong><\/p>\n\n\n\n<p><strong>A2:<\/strong> \u5728\u5927\u591a\u6570\u60c5\u51b5\u4e0b\uff0c\u8fd9\u4e24\u79cd\u5199\u6cd5\u5728\u6027\u80fd\u4e0a\u7684\u5dee\u5f02\u53ef\u4ee5\u5ffd\u7565\u4e0d\u8ba1\u3002\u4f46\u5728\u67d0\u4e9b\u7279\u5b9a\u7684JVM\u5b9e\u73b0\u6216\u786c\u4ef6\u4e0a\uff0c\u4e00\u79cd\u5199\u6cd5\u53ef\u80fd\u6bd4\u53e6\u4e00\u79cd\u5feb\u3002\u6700\u597d\u7684\u65b9\u6cd5\u662f\u6839\u636e\u5b9e\u9645\u7684\u8fd0\u884c\u73af\u5883\u8fdb\u884c\u57fa\u51c6\u6d4b\u8bd5\u3002<\/p>\n<\/div>\n\n\n\n<div class=\"wp-block-group is-vertical is-layout-flex wp-container-core-group-layout-3 wp-block-group-is-layout-flex\">\n<p><strong>Q3: \u6211\u662f\u5426\u5e94\u8be5\u5728\u6211\u7684\u4ee3\u7801\u4e2d\u4f7f\u7528a-b&gt;0\u7684\u5199\u6cd5\uff1f<\/strong><\/p>\n\n\n\n<p><strong>A3:<\/strong> \u8fd9\u53d6\u51b3\u4e8e\u4f60\u7684\u5177\u4f53\u9700\u6c42\u3002\u5982\u679c\u4f60\u5e0c\u671b\u4ee3\u7801\u4e0eJava\u6807\u51c6\u5e93\u7684\u98ce\u683c\u4fdd\u6301\u4e00\u81f4\uff0c\u6216\u8005\u4f60\u6b63\u5728\u5904\u7406\u53ef\u80fd\u5bfc\u81f4\u6574\u6570\u6ea2\u51fa\u7684\u6570\u503c\uff0c\u90a3\u4e48\u4f7f\u7528a-b&gt;0\u53ef\u80fd\u662f\u4e00\u4e2a\u597d\u9009\u62e9\u3002\u4f46\u5982\u679c\u4f60\u7684\u76ee\u6807\u662f\u786e\u4fdd\u4ee3\u7801\u7684\u7b80\u6d01\u6027\u548c\u76f4\u89c2\u6027\uff0c\u76f4\u63a5\u4f7f\u7528a&gt;b\u4e5f\u662f\u53ef\u4ee5\u7684\u3002<\/p>\n<\/div>\n\n\n\n<div class=\"wp-block-group is-vertical is-layout-flex wp-container-core-group-layout-4 wp-block-group-is-layout-flex\">\n<p><strong>Q4: a-b&gt;0\u8fd9\u79cd\u5199\u6cd5\u4e0e\u6d6e\u70b9\u6570\u6709\u5173\u5417\uff1f<\/strong><\/p>\n\n\n\n<p><strong>A4:<\/strong> \u901a\u5e38\u60c5\u51b5\u4e0b\uff0c\u8fd9\u79cd\u5199\u6cd5\u4e3b\u8981\u7528\u4e8e\u6574\u6570\u6bd4\u8f83\u3002\u5bf9\u4e8e\u6d6e\u70b9\u6570\uff0c\u7531\u4e8e\u7cbe\u5ea6\u95ee\u9898\u548c\u8868\u793a\u65b9\u5f0f\u7684\u7279\u70b9\uff0c\u76f4\u63a5\u4f7f\u7528\u51cf\u6cd5\u53ef\u80fd\u4f1a\u4ea7\u751f\u4e0d\u51c6\u786e\u7684\u7ed3\u679c\u3002\u5f53\u6bd4\u8f83\u6d6e\u70b9\u6570\u65f6\uff0c\u901a\u5e38\u4f7f\u7528\u7279\u5b9a\u7684\u5bb9\u5dee\u503c\u6765\u786e\u5b9a\u4e24\u4e2a\u6d6e\u70b9\u6570\u662f\u5426\u201c\u8db3\u591f\u63a5\u8fd1\u201d\u3002<\/p>\n<\/div>\n","protected":false},"excerpt":{"rendered":"Java\u6e90\u7801\u4e2d\u7ecf\u5e38\u770b\u5230\u7c7b\u4f3ca-b&gt;0\u8fd9\u6837\u7684\u5199\u6cd5\uff0c\u800c\u4e0d\u662f\u76f4\u63a5\u4f7f\u7528a&gt;b\u3002\u8fd9\u79cd\u5199\u6cd5\u4e0e\u76f4\u63a5\u7684\u6bd4\u8f83\u6709\u5176\u7279\u5b9a [&hellip;]","protected":false},"author":7,"featured_media":54128,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[37],"tags":[],"acf":[],"_links":{"self":[{"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/posts\/54126"}],"collection":[{"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/users\/7"}],"replies":[{"embeddable":true,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/comments?post=54126"}],"version-history":[{"count":0,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/posts\/54126\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/media\/54128"}],"wp:attachment":[{"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/media?parent=54126"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/categories?post=54126"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/tags?post=54126"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}