Question

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How to nicely format floating types to String?

I have number:

Double d1=(Double)0;
Double d2=(Double)2.2;
Double d3=(Double)4;

When I use to String, I get 0.0, 2.2, 4.0, but I want to see 0, 2.2, 4.
How can I do it?

Answer 1

Use DecimalFormat.format insted of Double.toString:

Double d1 = (Double)0.0;
Double d2 = (Double)2.2;
Double d3 = (Double)4.0;

// Example: Use four decimal places, but only if required
NumberFormat nf = new DecimalFormat("#.####");

String s1 = nf.format(d1); // 0
String s2 = nf.format(d2); // 2.2
String s3 = nf.format(d3); // 4

You don’t even need Doubles for that, doubles will work just fine.