double类型小数的二进制转换

 public class Float
{
 public static void main(String[] args)
 {
 System.out.println(1.0-0.9);                    //结果为0.09999999999999998
 System.out.println(1.0-0.1-0.1-0.1);  //二进制小数之间的转换。结果为0.7000000000000001
 }
}