仅Java 8的NumberFormat舍入问题

我可以将此问题归类到

java.text.DigitList

这种情况是，它认为十进制数字

6.0289

BigDecimal

6.208899…

5

5

HALF_DOWN

digit=='5'

digit>'5'

显然，这是一个错误，并且由于一个事实，即执行类似正确操作（仅针对另一个方向）的代码恰好位于损坏的错误代码的下面，因此这是一个奇怪的错误。

        case HALF_UP: if (digits[maximumDigits] >= '5') {     // We should not round up if the rounding digits position is     // exactly the last index and if digits were already rounded.     if ((maximumDigits == (count - 1)) &&         (alreadyRounded))         return false;     // Value was exactly at or was above tie. We must round up.     return true; } break;        case HALF_DOWN: if (digits[maximumDigits] > '5') {     return true; } else if (digits[maximumDigits] == '5' ) {     if (maximumDigits == (count - 1)) {         // The rounding position is exactly the last index.         if (allDecimalDigits || alreadyRounded)    return false;         else  // Value was above the tie, we must round up.  return true;     }     // We must round up if it gives a non null digit after '5'.     for (int i=maximumDigits+1; i<count; ++i) {         if (digits[i] != '0') {  return true;         }     } } break;

另一个数字没有发生这种情况的原因不是

6.2088

BigDecimal

6.208800…