package test;
import java.math.BigDecimal;public class Test { public static void main(String[] args) { //double 只适合做科学运算,如果要进行精确运算,是不能用double来做的 double a = 0.1; double b = 0.006; System.out.println(a+b);//0.10600000000000001 //要向精确运算就要用BigDecimal BigDecimal a1 = new BigDecimal("0.1"); BigDecimal b1 = new BigDecimal("0.006"); //+ System.out.println(a1.add(b1).toString());//0.106 //* System.out.println(a1.multiply(b1).toString()); //除 要写保留的小数点位数 System.out.println(a1.divide(b1,5,BigDecimal.ROUND_HALF_UP).toString()); }}