java 如何从字符串中删除尾随零？
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How to remove trailing zeros from a string?
提问by ACP
I have a string salePricewhich can have values like 29.90000,91.01000and i want to get the output like 29.90,91.01as in with the two digits after decimal points. i am using a string.
我有一个字符串salePrice，它可以有像这样的值29.90000,91.01000，我想得到像29.90,91.01小数点后两位数字那样的输出。我正在使用字符串。
回答by Grzegorz ?ur
One of possible solutions
可能的解决方案之一
new BigDecimal("29.90000").setScale(2).toString()
Or if you need to round
或者如果你需要舍入
new BigDecimal("29.90100").setScale(2, RoundingMode.HALF_UP).toString()
Using BigDecimal because converting from String to double can lose precision!
使用 BigDecimal 是因为从 String 转换为 double 会失去精度！
Choose rounding mode that fits your case.
选择适合您情况的舍入模式。
回答by MG_Bautista
Try this...
试试这个...
DecimalFormat df2 = new DecimalFormat( "#,###,###,###.##" );
double dd = 100.2397;
double dd2dec = new Double(df2.format(dd)).doubleValue();
回答by Marvin Emil Brach
int lastIndex = salePrice.indexOf(".") + 2
salePrice = salePrice.substring(0, lastIndex);
回答by Suresh Atta
you can use
您可以使用
String.format("%.2f", value);
回答by giannis christofakis
You can use Apache Commons Mathematics Library
您可以使用Apache Commons Mathematics Library
NumberFormat nf = NumberFormat.getInstance();
nf.setMinimumFractionDigits(2);
nf.setMaximumFractionDigits(2);
ComplexFormat cf = new ComplexFormat(nf);
Complex complex = cf.parse("29.90000");
回答by DwB
Here is an old-school way that matches your question (you always want 2 decimal places)
这是一种与您的问题相匹配的老式方法（您总是需要小数点后两位）
public class LearnTrim
{
public static void main(final String[] arguments)
{
String value1 = "908.0100";
String value2 = "876.1";
String value3 = "101";
String value4 = "75.75";
String value5 = "31.";
System.out.println(value1 + " => " + trimmy(value1));
System.out.println(value2 + " => " + trimmy(value2));
System.out.println(value3 + " => " + trimmy(value3));
System.out.println(value4 + " => " + trimmy(value4));
System.out.println(value5 + " => " + trimmy(value5));
}
private static String trimmy(final String value)
{
int decimalIndex;
String returnValue;
int valueLength = value.length(); // use StringUtils.length() for null safety.
decimalIndex = value.indexOf('.');
if (decimalIndex != -1)
{
if (decimalIndex < (valueLength - 3))
{
returnValue = value.substring(0, valueLength - 2);
}
else if (decimalIndex == (valueLength - 3))
{
returnValue = value;
}
else if (decimalIndex == (valueLength - 2))
{
returnValue = value + "0";
}
else // decimalIndex == valueLength - 1
{
returnValue = value + "00";
}
}
else
{
returnValue = value + ".00";
}
return returnValue;
}
}
