{"id":79,"date":"2021-08-25T15:06:34","date_gmt":"2021-08-25T07:06:34","guid":{"rendered":"https:\/\/www.52dixiaowo.com\/javav2\/?p=79"},"modified":"2021-08-27T11:11:44","modified_gmt":"2021-08-27T03:11:44","slug":"java-lang-math","status":"publish","type":"post","link":"https:\/\/www.52dixiaowo.com\/javav2\/post-79.html","title":{"rendered":"java.lang.Math"},"content":{"rendered":"\n<p>Math\u7c7b\uff0c\u5c01\u88c5\u4e86\u4e00\u4e9b\u6570\u5b66\u8fd0\u7b97\u76f8\u5173\u7684\u9759\u6001\u5c5e\u6027\uff0c\u548c\u9759\u6001\u65b9\u6cd5<\/p>\n\n\n\n<p>\u5b98\u65b9\u6587\u6863\u4f20\u9001\u95e8\uff1a<a rel=\"noreferrer noopener\" href=\"https:\/\/java-api.52dixiaowo.com\/libs\/jdk-6-zh\/java\/lang\/Math.html\" target=\"_blank\">java.lang.Math<\/a><\/p>\n\n\n\n<h2>\u9759\u6001\u5b57\u6bb5<\/h2>\n\n\n\n<p>1.\u201d\u5706\u5468\u7387\u03a0\u201d \u7684\u503c<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>double PI = Math.PI; \/\/3.141592653589793<\/code><\/pre>\n\n\n\n<p>2.\u81ea\u7136\u5bf9\u6570\u7684\u5e95\u6570 e \u7684\u503c<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>double E = Math.E;  \/\/2.718281828459045<\/code><\/pre>\n\n\n\n<h2>\u9759\u6001\u65b9\u6cd5<\/h2>\n\n\n\n<p>1.\u83b7\u53d6\u7edd\u5bf9\u503c<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>double abs1 = Math.abs(-5);  \/\/5.0<\/code><\/pre>\n\n\n\n<p>2.\u53d6\u6574<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>double ceil = Math.ceil(5.5); \/\/ \u5411\u4e0a\u53d6\u6574 6.0 \ndouble floor = Math.floor(5.5);  \/\/\u5411\u4e0b\u53d6\u6574 5.0<\/code><\/pre>\n\n\n\n<p>3.\u56db\u820d\u4e94\u5165<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>long r1 = Math.round(3.4);   \/\/ 3\nlong r2 = Math.round(3.5);   \/\/ 4<\/code><\/pre>\n\n\n\n<p>4.\u53d6\u6700\u503c<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>int  max = Math.max(10, 20); \/\/20<\/code><\/pre>\n\n\n\n<p>5.\u53d6\u968f\u673a\u6570<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>double random = Math.random();  \/\/\u53d6\u503c\u8303\u56f4 &#91;0,1)<\/code><\/pre>\n\n\n\n<p>6.\u53d6\u6b21\u5e42<\/p>\n\n\n\n<p>\u53c2\u6570\u4e0e\u8fd4\u56de\u503c\u5747\u4e3a double \u7c7b\u578b<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>System.out.println(Math.pow(2,5));  \/\/ 2\u76845\u6b21\u5e42 32.0<\/code><\/pre>\n\n\n\n<p>7.\u6c42\u5e73\u65b9\u6839<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>System.out.println(Math.sqrt(4));  \/\/ 2.0 , \u7c7b\u578b\u4e3adouble<\/code><\/pre>\n","protected":false},"excerpt":{"rendered":"<p>Math\u7c7b\uff0c\u5c01\u88c5\u4e86\u4e00\u4e9b\u6570\u5b66\u8fd0\u7b97\u76f8\u5173\u7684\u9759\u6001\u5c5e\u6027\uff0c\u548c\u9759\u6001\u65b9\u6cd5 \u5b98\u65b9\u6587\u6863\u4f20\u9001\u95e8\uff1ajava.lang.Math \u9759\u6001\u5b57&hellip; <a href=\"https:\/\/www.52dixiaowo.com\/javav2\/post-79.html\" class=\"more-link\">\u7ee7\u7eed\u9605\u8bfb <span class=\"screen-reader-text\">java.lang.Math<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":[],"categories":[5],"tags":[],"_links":{"self":[{"href":"https:\/\/www.52dixiaowo.com\/javav2\/wp-json\/wp\/v2\/posts\/79"}],"collection":[{"href":"https:\/\/www.52dixiaowo.com\/javav2\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.52dixiaowo.com\/javav2\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.52dixiaowo.com\/javav2\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.52dixiaowo.com\/javav2\/wp-json\/wp\/v2\/comments?post=79"}],"version-history":[{"count":0,"href":"https:\/\/www.52dixiaowo.com\/javav2\/wp-json\/wp\/v2\/posts\/79\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.52dixiaowo.com\/javav2\/wp-json\/wp\/v2\/media?parent=79"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.52dixiaowo.com\/javav2\/wp-json\/wp\/v2\/categories?post=79"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.52dixiaowo.com\/javav2\/wp-json\/wp\/v2\/tags?post=79"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}