java进阶 - Math -abs取绝对值 -ceil向上取整 -ceil向下取整 -四舍五入round -max返回最大值 -max返回最小值 -random随机数39

package com.cyjt97.M;

public class mathM {
    public static void main(String[] args) {
//        abs取绝对值
        System.out.println(Math.abs(-123));//123
        System.out.println(Math.abs(-12.3));//12.3
        System.out.println("--------------------------------");
//        ceil向上取整
        System.out.println(Math.ceil(12.3));//13.0
        System.out.println(Math.ceil(12.9));//13.0
        System.out.println(Math.ceil(12.1));//13.0
        System.out.println("--------------------------------");
        //        ceil向下取整
        System.out.println(Math.floor(12.3));//12.0
        System.out.println(Math.floor(12.9));//12.0
        System.out.println(Math.floor(12.1));//12.0
        System.out.println("--------------------------------");
//        四舍五入round
        System.out.println(Math.round(3.4));//3
        System.out.println(Math.round(3.5));//4
        System.out.println(Math.round(3.6));//4
        System.out.println("--------------------------------");
//        max返回最大值
        System.out.println(Math.max(10, 30));//30
        System.out.println(Math.max(10, 20));//20
        System.out.println("--------------------------------");
//        max返回最小值
        System.out.println(Math.min(10, 20));//10
        System.out.println("--------------------------------");
//        pow返回a的b次幂
        System.out.println(Math.pow(10, 10));
        System.out.println("--------------------------------");
//        random随机数
        System.out.println(Math.random());

    }
}