How to nicely format floating numbers to String without unnecessary decimal 0?

Pyrolistical picture Pyrolistical · Apr 1, 2009 · Viewed 644k times · Source

An 64-bit double can represent integer +/- 253 exactly

Given this fact I choose to use a double type as a single type for all my types, since my largest integer is unsigned 32-bit.

But now I have to print these pseudo integers, but the problem is they are also mixed in with actual doubles.

So how do I print these doubles nicely in Java?

I have tried String.format("%f", value), which is close, except I get a lot of trailing zeros for small values.

Here's an example output of of %f

232.00000000
0.18000000000
1237875192.0
4.5800000000
0.00000000
1.23450000

What I want is:

232
0.18
1237875192
4.58
0
1.2345

Sure I can write a function to trim those zeros, but that's lot of performance loss due to String manipulation. Can I do better with another format code?

EDIT

The answers by Tom E. and Jeremy S. are unacceptable as they both arbitrarily rounds to 2 decimal places. Please understand the problem before answering.

EDIT 2

Please note that String.format(format, args...) is locale-dependent (see answers below).

Answer

Tom Esterez picture Tom Esterez · Nov 15, 2010
new DecimalFormat("#.##").format(1.199); //"1.2"

As pointed in the comments, this is not the right answer to the original question.
That said, it is a very useful way to format numbers without unnecessary trailing zeros.