@Test

    public void test1(){

        System.out.print(0.05+0.01);

    }

    @Test

    public void test2(){

        BigDecimal b1 = new BigDecimal(0.01);

        BigDecimal b2 = new BigDecimal(0.05);

        System.out.print(b1.add(b2));

    }

    @Test

    public void test3(){

        BigDecimal b1 = new BigDecimal("0.01");

        BigDecimal b2 = new BigDecimal("0.05");

        System.out.print(b1.add(b2));

    }

package com.mmall.util;

import java.math.BigDecimal;

public class BigDecimalUtil {

    private BigDecimalUtil(){

    }

    public static BigDecimal add(double v1,double v2){

        BigDecimal b1 = new BigDecimal(Double.toString(v1));

        BigDecimal b2 = new BigDecimal(Double.toString(v2));

        return b1.add(b2);

    }

    public static BigDecimal sub(double v1,double v2){

        BigDecimal b1 = new BigDecimal(Double.toString(v1));

        BigDecimal b2 = new BigDecimal(Double.toString(v2));

        return b1.subtract(b2);

    }

    public static BigDecimal mul(double v1,double v2){

        BigDecimal b1 = new BigDecimal(Double.toString(v1));

        BigDecimal b2 = new BigDecimal(Double.toString(v2));

        return b1.multiply(b2);

    }

    public static BigDecimal div(double v1,double v2){

        BigDecimal b1 = new BigDecimal(Double.toString(v1));

        BigDecimal b2 = new BigDecimal(Double.toString(v2));

        return b1.divide(b2,2,BigDecimal.ROUND_HALF_UP);//四舍五入,保留两位小数

    }

}