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# trying to restrict decimal places in double

Ranch Hand
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Hi

Just a quick one. Anyone know how to restrict the number of decimal places in a doouble value to 2?

I've had a look around and seen a few answer with silly caluculations (divide by 100 * by itself etc...) but none of them seem to work. All i want to do is reduce the decimal places for a value

so for example: 10.714285714285714% becomes 10.71%

thanx

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Have a look at the API for the DecimalFormat class.

Greenhorn
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As the previous post suggests, just use the DecimalFormat class in the java.text package. Something like this should work:

Double d = (65.28262);
DecimalFormat df = new DecimalFormat("0.00");
df.format(d);

Ranch Hand
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If what you want to do is to obtain a textual representation of the value, with two decimal places, DecimalFormat is indeed the way to go.

If what you want to do is to perform calculations using only two decimal places, then you should not be using floating-point arithmetic. Instead, you should do integer calculations, using "hundredths" (if you're doing currency, call them "cents", "pence" etc.).

 Consider Paul's rocket mass heater.