关于JAVA浮点数除法的高精度计算

针对普通除法无法得到精确值，引入精确除法运算

import java.util.*;
import java.lang.*;
import java.io.*;
import java.math.*;
/* Name of the class has to be "Main" only if the class is public. */
class Codechef
{
// 	public static void main (String[] args) throws java.lang.Exception
// 	{
// 		// your code goes here
// 		double num2 = 8.1 / 3;
// 		System.out.println(num2);
// 	}
    public static void main(String[] args) {
 
        BigDecimal b1 = new BigDecimal("8.1");
        BigDecimal b2 = new BigDecimal("3");
        BigDecimal divide = b1.divide(b2, 10, RoundingMode.HALF_UP);
        System.out.println(divide);
 
    }
}