java常用类之Math

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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               }   }