Show decimal of a double only when needed
Solution 1
The DecimalFormat with the # parameter is the way to go:
public static void main(String[] args) {
double d1 = 1.234567;
double d2 = 2;
NumberFormat nf = new DecimalFormat("##.###");
System.out.println(nf.format(d1));
System.out.println(nf.format(d2));
}
Will result in
1.235
2
Solution 2
Don't use doubles. You can lose some precision. Here's a general purpose function.
public static double round(double unrounded, int precision, int roundingMode)
{
BigDecimal bd = new BigDecimal(unrounded);
BigDecimal rounded = bd.setScale(precision, roundingMode);
return rounded.doubleValue();
}
You can call it with
round(yourNumber, 3, BigDecimal.ROUND_HALF_UP);
"precision" being the number of decimal points you desire.
Bigflow
Updated on July 15, 2020Comments
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Bigflow almost 4 years
I got this problem with double (decimals).
When a double = 1.234567 Then I useString.format("%.3f", myString);
So the result is 1.234But when my double is 10
The result will be 10,000
I want this to be 10Is their a way to say that he only needs to show the decimals when it is "usefull"?
I saw some posts about this, but that was php or c#, couldn't find something for android/java about this (maybe I don't look good).
Hope you guys can help me out with this.
Edit, for now I use something like this:
myString.replace(",000", "");
But I think their is a more "friendly" code for this.