CODEWITHSUNDEEP
javaformattingdecimal
richs
richs

Reputation: 4769

Java decimal formatting using String.format?

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 "34.4959" 
"49.3" would be "49.30"

Can this be done using the String.format command?
Or is there an easier/better way to do this in Java.

Upvotes: 90

Views: 236058

Answers (6)

mostar
mostar

Reputation: 4821

Yes you can do it with String.format:

String result = String.format("%.2f", 10.0 / 3.0);
// result:  "3.33"

result = String.format("%.3f", 2.5);
// result:  "2.500"

Upvotes: 196

Yuval Adam
Yuval Adam

Reputation: 165202

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));

Upvotes: 42

Brian Clapper
Brian Clapper

Reputation: 26211

NumberFormat and DecimalFormat are definitely what you want. Also, note the NumberFormat.setRoundingMode() method. You can use it to control how rounding or truncation is applied during formatting.

Upvotes: 2

Richard Campbell
Richard Campbell

Reputation: 3621

You want java.text.DecimalFormat.

DecimalFormat df = new DecimalFormat("0.00##");
String result = df.format(34.4959);

Upvotes: 98

cagcowboy
cagcowboy

Reputation: 30828

java.text.NumberFormat is probably what you want.

Upvotes: 3

duffymo
duffymo

Reputation: 308743

You want java.text.DecimalFormat

Upvotes: 1

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