Question

Good day.

I need to format a number in java.
So far I have this:

DecimalFormat df2 = new DecimalFormat( "#,###,###,##0.00" );
System.out.println(new Double(df2.format(balance)).doubleValue());

But it prints out this

110.0
121.0
133.1
146.41
161.05

But I need it to be with two digits in fraction part. How do I do it?

Answer 1

You don’t have to get double value from formatted string.
Just use formatted string, which is returned from format() method of DecimalFormat.
So your code should be like the following:

DecimalFormat df2 = new DecimalFormat( "#,###,###,##0.00" );
...
System.out.println(df2.format(balance));

Your original code:

System.out.println(new Double(df2.format(balance)).doubleValue());

What you did in your code is: format the double value to string(which is formatted as you specified in the DecimalFormat instance). Then you convert the formatted string to Double instance and get double value from the object, which is double. And then printed it to console. So the formatted string is gone, and the double value is printed as normal.