java保留2位小数 java 四舍五入使java保留2位小数示例讲解

/*
 * 测试四舍五入
 */
package com.icer.test;

/**
 *
 * @author Hanbin
 */
public class MyRound {
    public static void main(String[] args) {
        double num = 3.23562;
        double number = 0;
        number = new MyRound().myRound(num,2);
        System.out.println("after:" + number);
    }

    private double myRound(double number,int index){
        double result = 0;
        double temp = Math.pow(10, index);
        result = Math.round(number*temp)/temp;
        return result;
    }
}