问为什么Math.round（0.49999999999999994）返回1？

for (int i = 10; i >= 0; i--) {

    long l = Double.doubleToLongBits(i + 0.5);

    double x;

    do {

        x = Double.longBitsToDouble(l);

        System.out.println(x + " rounded is " + Math.round(x));

        l--;

    } while (Math.round(x) > i);

}

10.5 rounded is 11

10.499999999999998 rounded is 10

9.5 rounded is 10

9.499999999999998 rounded is 9

8.5 rounded is 9

8.499999999999998 rounded is 8

7.5 rounded is 8

7.499999999999999 rounded is 7

6.5 rounded is 7

6.499999999999999 rounded is 6

5.5 rounded is 6

5.499999999999999 rounded is 5

4.5 rounded is 5

4.499999999999999 rounded is 4

3.5 rounded is 4

3.4999999999999996 rounded is 3

2.5 rounded is 3

2.4999999999999996 rounded is 2

1.5 rounded is 2

1.4999999999999998 rounded is 1

0.5 rounded is 1

0.49999999999999994 rounded is 1

0.4999999999999999 rounded is 0