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九肽荷尔蒙

浅尝辄止,贪得无厌
2021-08-24

Java math.round四舍五入方法

Java math.round四舍五入方法
public class Test7 { public static void main(String[] args) { /** * 数学里面 四舍五入是不看负号的。 * Math.round方法里面是每次都自动+0.5 然后向下取整。 * 所以Math.round(-1.5)结果是-1, Math.round(-1.6)结果是-2 */ long d1 = Math.round(-1.5); //结果是 -1 long d2 = Math.round(-1.6); //结果是 -2 long d3 = Math.round(-2.5); //结果是 -2! long d4 = Math.round(2.5); //结果是 3 System.out.println(d1); System.out.println(d2); System.out.println(d3); System.out.println(d4); }}
九肽荷尔蒙
2021-08-24

JavaSE

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2021年08月24日
41 阅读
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2021-08-16

Properties类

Properties类
Properties类概述Properties 继承于 Hashtable。表示一个持久的属性集,属性列表以key-value的形式存在,key和value都是字符串。主要用于配置文件。常用方法写入public static void main(String[] args) throws IOException { Properties properties = new Properties(); OutputStream output = null; try { output = new FileOutputStream("src/main/resources/config.properties"); properties.setProperty("username", "root"); properties.setProperty("password", "123456"); // 保存键值对到文件中 properties.store(...
九肽荷尔蒙
2021-08-16

JavaSE

45 阅读
0 评论
2021年08月16日
45 阅读
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