在java中为零的负号 [英] Negative sign in case of zero in java

问题描述

当结果返回零时，是否有任何方法可以截断负号;使用十进制格式时？

Is there any way to truncate the negative sign when the result returns zero; while using decimal format?

DecimalFormat df = new DecimalFormat("#,##0.0");
df.setRoundingMode(RoundingMode.HALF_UP);
formattedValue = df.format("-0.023");

上面的代码返回-0.0。有没有办法只返回0.0？但是，当结果为负数时，我想保留负号。

The above code returns -0.0 . Is there any way by which it will return only 0.0? However, I want to retain the negative sign when the result is a negative number.

推荐答案

我认为没有办法只使用 DecimalFormat 进行此操作，但是这个单线程可以解决问题：

I don't think there's a way of doing it just with DecimalFormat, but this one-liner takes care of the problem:

formattedValue = formattedValue.replaceAll( "^-(?=0(.0*)?$)", "");

它删除（替换为）减号，如果后跟0-n字符0.00000 ...，那么这将适用于任何类似的结果，例如 - 0， - 0。或 - 0.000000000

It removes (replaces with "") the minus sign if it's followed by 0-n characters of "0.00000...", so this will work for any similar result such as "-0", "-0." or "-0.000000000"

以下是一些测试代码：

public static void main(String[] args) {
    System.out.println(format(-0.023));
    System.out.println(format(12.123));
    System.out.println(format(-12.345));
    System.out.println(format(-0.123));
    System.out.println(format(-1.777));
}

public static String format(double number) {
    DecimalFormat df = new DecimalFormat("#,##0.0");
    df.setRoundingMode(RoundingMode.HALF_UP);
    String formattedValue = df.format(number);
    formattedValue = formattedValue.replaceAll("^-(?=0(.0*)?$)", "");
    return formattedValue;
}

输出（按预期）：

0.0
12.1
-12.3
-0.1
-1.8

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