1 package cn.mantishell.day08.demo04;
2
3 /**
4 * java.util.Math类是数学相关的工具类，里面提供类大量的静态方法，完成与数学运算相关的操作
5 *
6 * public static double abs(double num);获取绝对值
7 * public static double ceil(double num);向上取整
8 * public static double floor(double num);向下取整
9 * public static long round(double num);四舍五入
10 */
11 public class Demo03Math {
12 public static void main(String[] args) {
13 //获取绝对值
14 System.out.println(Math.abs(-2.5));//2.5
15 //向上取整
16 System.out.println(Math.ceil(3.9));//4.0
17 System.out.println(Math.ceil(3.1));//4.0
18 System.out.println(Math.ceil(3.0));//3.0
19
20 System.out.println(Math.floor(10.9));
21
22 System.out.println(Math.round(2.6));
23 }
24 }
