In java, is it possible to use String.format to only show a decimal if there is actually a need? For example, if I do this:
String.format("%.1f", amount);
it will format:
"1.2222" -> "1.2"
"1.000" -> "1.0"
etc,
but in the second case (1.000) I want it to return just "1". Is this possible with String.format, or am going to have to use a DecimalFormatter?
If I have to use a decimal formatter, will I need to make a separate DecimalFormatter for each type of format I want? (up to 1 decimal place, up to 2 decimal places, etc)
No, you have to use DecimalFormat:
final DecimalFormat f = new DecimalFormat("0.##");
System.out.println(f.format(1.3));
System.out.println(f.format(1.0));
Put as many #s as you'd like; the DecimalFormat will only print as many digits as it thinks are significant, up to the number of #s.
This might get you what your looking for; I'm not sure of the requirements or context of your request.
float f;
f = 1f
System.out.printf(f==Math.round(f) ? "%d\n" : "%s\n", f); //1
f = 1.555f
System.out.printf(f==Math.round(f) ? "%d\n" : "%s\n", f); //1.555
Worked great for what I needed.
FYI, above, System.out.printf(fmt, x) is like System.out.print(String.format(fmt, x)
