java常用类之Math

package com.Lucky.OftenClass;
/*
   Math1类：

 */
public class MathCalss {

    public static void main(String[] args) {

        System.out.println(Math.PI);
        System.out.println(Math.max(1,5));        //最大值
        System.out.println(Math.min(2,9));      //最小值
        System.out.println(Math.pow(2,2));      //平方
        System.out.println(Math.abs(-5));       //绝对值
        System.out.println(Math.ceil(4.5));    //向上取整
        System.out.println(Math.floor(4.5));   //向下取整
        System.out.println(Math.round(4.5));   //四舍五入
        System.out.println(Math.signum(14.5));    //正数返回1
        System.out.println(Math.signum(-14.5));  //负数返回-1
        System.out.println(Math.signum(0));   //0
        System.out.println(Math.sqrt(25));   //开平方





    }

}