java 浮点数加减乘除精度丢失问题解决方法

import java.math.BigDecimal;
 
public class testDouble {
    public static void main(String[] args) {
   
        double a = 1.3;
        double b = 32.123;
        System.out.println(Double.sum(a, b));//丢失精度
        System.out.println(a+b);
        BigDecimal bigDecimal = new BigDecimal(Double.toString(a));
        BigDecimal bigDecimalB = new BigDecimal(Double.toString(b));
        System.out.println(bigDecimal.add(bigDecimalB));//33.423
    }
}