Java decimal formatting using String.format?

Question

I need to format a decimal value into a string where I always display at lease 2 decimals and at most 4.

So for example

\"34.49596\" would be \"34.4         


        

Answer 1

Here is a small code snippet that does the job:

double a = 34.51234;

NumberFormat df = DecimalFormat.getInstance();
df.setMinimumFractionDigits(2);
df.setMaximumFractionDigits(4);
df.setRoundingMode(RoundingMode.DOWN);

System.out.println(df.format(a));