Java 十进制格式问题零 (0.00)

Question

格式化程序有问题，当我给出 0.00 return +0,00 E 但我想要 0,00 E.

String PATTERN = "###,##0.00\u00a0\u00A4";
DecimalFormatSymbols SYMBOLS = DecimalFormatSymbols.getInstance(Locale.FRANCE);
DecimalFormat FORMATTER_SIGN = new DecimalFormat(PATTERN, SYMBOLS);
FORMATTER_SIGN.setNegativePrefix("-\u00a0");
FORMATTER_SIGN.setPositivePrefix("+\u00a0");
FORMATTER_SIGN.format("0.00") // this

Answer 1

当我删除行时我可以去掉“+”

FORMATTER_SIGN.setPositivePrefix("+\u00a0");

或改为

FORMATTER_SIGN.setPositivePrefix("");

导致

0,00 €

PS：你的format电话对我不起作用，我需要做这样的事情：

FORMATTER_SIGN.format(Double.valueOf("0.00")); // this

Answer 2

您可以创建自己的识别零的 DecimalFormat（简化示例）：

class ZeroAwareDecimalFormat extends DecimalFormat {
    private final DecimalFormat zeroFormat;

    public ZeroAwareDecimalFormat(String posNegPattern, String zeroPattern) {
        super(posNegPattern);
        zeroFormat = new DecimalFormat(zeroPattern);
    }

    @Override
    public StringBuffer format(long number, StringBuffer result, FieldPosition fieldPosition) {
        if (number == 0L) {
            return zeroFormat.format(number, result, fieldPosition);
        } else {
            return super.format(number, result, fieldPosition);
        }
    }

    // Override the other methods accordingly.
    // set... methods should be propagated to super and zeroFormat.
}

Java 十进制格式问题零 (0.00)

Java Decimal Format issue zero (0.00)

java

decimalformat