How can I round decimal numbers in Java?

Question

I know that in Java we have a lot of methods to round, but if my code returns the value

0.19998344639311716

And I need the value

0.2

If I use the method Math.round() it will return 0.0

If I use Math.ceil() it will return 1.0

What method I can use to return 0.2?

If your code has those errors and they matter you probably should not be using floating point. Check out BigDecimal. — Diego Basch, Oct 01 '14 at 19:04
http://stackoverflow.com/questions/153724/how-to-round-a-number-to-n-decimal-places-in-java — Grice, Oct 01 '14 at 19:06

score 1 · Answer 1 · answered Oct 01 '14 at 19:04

1

Well, you can always Math.round(x*10) / 10 .

answered Oct 01 '14 at 19:04

zmbq

score 0 · Answer 2 · answered Oct 01 '14 at 19:05

0

Here's a big decimal example:

BigDecimal bd = new BigDecimal(double_value).setScale(1, RoundingMode.HALF_EVEN);

answered Oct 01 '14 at 19:05

ne1410s

2 Answers2