JAVA基础 之 Math

package com.cxy.e;

public class MathTest
{
	/**
	 * 数学类
	 */
	public static void main(String[] args)
	{
		//返回大于或等于参数的最小整数值
		System.out.println(Math.ceil(12.1));
		System.out.println("============================");
		
		
		//返回小于或等于参数的最小整数值
		System.out.println(Math.floor(12.9));
		System.out.println("============================");
		
		//四舍五入
		System.out.println(Math.round(12.4));
		System.out.println(Math.round(12.5));
		System.out.println("============================");
		
		
		//绝对值
		System.out.println(Math.abs(-100));
		System.out.println("============================");
		
		
		//平方根
		System.out.println(Math.sqrt(9));
		System.out.println("============================");
		
		//a的b次方
		System.out.println(Math.pow(2, 3));
		System.out.println("============================");
		
		
		//取大
		System.out.println(Math.max(123.234, 123.2341));
		System.out.println("============================");
		
		//取小
		System.out.println(Math.min(123.234, 123.2341));
		System.out.println("============================");
		
		//随机数
		System.out.println(Math.random());
		System.out.println("============================");
	}
}