java 如何删除字符串值中的尾随零并删除小数点
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How to remove trailing zero in a String value and remove decimal point
提问by Marjer
How do I remove trailing zeros in a String value and remove decimal point if the string contains only zeros after the decimal point? I'm using the below code:
如果字符串只包含小数点后的零，如何删除字符串值中的尾随零并删除小数点？我正在使用以下代码：
String string1 = Double.valueOf(a).toString()
This removes trailing zeros in (10.10 and 10.2270), but I do not get my expected result for 1st and 2nd inputs.
这会删除 (10.10 和 10.2270) 中的尾随零，但我没有得到第一个和第二个输入的预期结果。
Input
输入
10.0
10.00
10.10
10.2270
Expected output
预期输出
10
10
10.1
10.227
回答by jdphenix
The Java library has a built-inclass that can do this for it. It's BigDecimal.
Java 库有一个内置类可以为它做这件事。它是BigDecimal。
Here is an example usage:
这是一个示例用法：
BigDecimal number = new BigDecimal("10.2270");
System.out.println(number.stripTrailingZeros().toPlainString());
Output:
输出：
10.227
Note: It is important to use the BigDecimalconstructor that takes a String. You probably don't want the one that takes a double.
注意：使用BigDecimal带有String. 你可能不想要一个需要double.
Here's a method that will take a Collection<String>and return another Collection<String>of numbers with trailing zeros removed, gift wrapped.
这是一个方法，它将接受一个Collection<String>并返回另一个Collection<String>删除尾随零的数字，礼品包装。
public static Collection<String> stripZeros(Collection<String> numbers) {
if (numbers == null) {
throw new NullPointerException("numbers is null");
}
ArrayList<String> value = new ArrayList<>();
for (String number : numbers) {
value.add(new BigDecimal(number).stripTrailingZeros().toPlainString());
}
return Collections.unmodifiableList(value);
}
Example usage:
用法示例：
ArrayList<String> input = new ArrayList<String>() {{
add("10.0"); add("10.00"); add("10.10"); add("10.2270");
}};
Collection<String> output = stripZeros(input);
System.out.println(output);
Outputs:
输出：
[10, 10, 10.1, 10.227]
回答by Viraj
Try
尝试
DecimalFormat decimalFormat = new DecimalFormat("#.##");
String string1 = decimalFormat.format(10.000);
回答by TheLostMind
Try regex like this :
像这样尝试正则表达式：
public static void main(String[] args) {
String s = "10.0";
System.out.println(s.replaceAll("[0]+$", "").replaceAll("(\.)(?!.*?[1-9]+)", ""));
}
O/P:
10
input :String s = "10.0750";
O/P : 10.075
input : String s = "10.2750";
O/P : 10.275
