在下面的程序中，您可以看到.5除以外的每個值都略小于四舍五入的值0.5。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);}版畫10.5 rounded is 1110.499999999999998 rounded is 109.5 rounded is 109.499999999999998 rounded is 98.5 rounded is 98.499999999999998 rounded is 87.5 rounded is 87.499999999999999 rounded is 76.5 rounded is 76.499999999999999 rounded is 65.5 rounded is 65.499999999999999 rounded is 54.5 rounded is 54.499999999999999 rounded is 43.5 rounded is 43.4999999999999996 rounded is 32.5 rounded is 32.4999999999999996 rounded is 21.5 rounded is 21.4999999999999998 rounded is 10.5 rounded is 10.49999999999999994 rounded is 10.4999999999999999 rounded is 0我正在使用Java 6 update 31。