MATH类

public class Mathclass {    public static void main(String[] args) {        //向上取整        System.out.println(Math.ceil(6.9));        //向下取整        System.out.println(Math.floor(6.9));        //四舍五入        System.out.println(Math.round(6.3));        //求次方        System.out.println(Math.pow(2,3));        //求最大        System.out.println(Math.max(6,9));        //随机数        System.out.println(Math.random());        //求最小        System.out.println(Math.min(6,9));    }