DecimalFormat

[Roedy Green]

If you wanted to trim trailing 0s from a string representation of a
number after the decimal point, can you do it directly with
DecimalFormat, or do you need to do String operations on the result?

 

[John B. Matthews]

If you wanted to trim trailing 0s from a string representation of a
number after the decimal point, can you do it directly with
DecimalFormat, or do you need to do String operations on the result?

I'm pretty sure you'd have to convert the String to a Number, long or
double before you could format() it.

 

[Eric Sosman]

If you wanted to trim trailing 0s from a string representation of a
number after the decimal point, can you do it directly with
DecimalFormat, or do you need to do String operations on the result?

If you're starting with the numeric value (as opposed to an
already-generated String), just use the '#' pattern character, as

NumberFormat fmt = new DecimalFormat("#.##");

This will format 1.20 as "1.2" and 3.45 as "3.45".

 

[Roedy Green]

I'm pretty sure you'd have to convert the String to a Number, long or
double before you could format() it.

I have it as a double. DecimalFormat.format gives me the String.

My question is, is there any tricky pattern you can give it to trim
trailing 000, or do you need to process the output of .format as a
String?

 

[Roedy Green]

NumberFormat fmt = new DecimalFormat("#.##");

This will format 1.20 as "1.2" and 3.45 as "3.45".

Any is there a way to trim .00 to get rid of the dot too, or is that
the default behaviour?

 

[Eric Sosman]

Any is there a way to trim .00 to get rid of the dot too, or is that
the default behaviour?

fmt.setDecimalSeparatorAlwaysShown(false);

 

[John B. Matthews]

I have it as a double.

Ah, you only mentioned string. Eric's answers are what you want.

[...]

 

[Roedy Green]

Any is there a way to trim .00 to get rid of the dot too, or is that
the default behaviour?

I found that .### works exactly as needed, dropping the dot for .000.
Thanks.