How to round BigDecimal to return two decimal

Question

I need to return BigDecimal in this format (%.##) For example i have this floating number

3.2->3.20
6.2->6.20
112.0->112.00

I'm trying this

BigDecimal precoDecial = new BigDecimal(preco);
precoDecial.setScale(2, BigDecimal.ROUND_HALF_UP);

But it is not working for me; this returns:

for:
3.2->3.2000000476837158203125
6.2->6.2

My log with the code reference

try converting to a double, then using a formatter: http://stackoverflow.com/questions/12806278/double-decimal-formatting-in-java — Torie J, Feb 17 '16 at 02:12
@ScaryWombat i'm using the log just test what i receive of return — Helio Soares Junior, Feb 17 '16 at 02:33
SetScale returns a *new* BigDecimal, it does not modify `precoDecial`. So you should assign the result of `setScale` to a BigDecimal, possibly even `precoDecial`, again. — Rudy Velthuis, Feb 17 '16 at 08:01

score 1 · Answer 1 · answered Feb 17 '16 at 02:12

1

BigDecimal precoDecial = new BigDecimal(1.0);
        precoDecial = precoDecial.setScale(2, BigDecimal.ROUND_HALF_UP);
        System.out.println(precoDecial);

I tried this in my IDE it worked better give it a try hope my work may solve your problem

output

if 1-->1.00
if 1.0-->1.00
if 1.00000000-->1.00

answered Feb 17 '16 at 02:12

SmashCode

741
1
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1

can you say what are values in resultado – SmashCode Feb 17 '16 at 02:36
Is an data array with model, i get this from my server – Helio Soares Junior Feb 17 '16 at 02:38
1

any sample data like 45.55 – SmashCode Feb 17 '16 at 02:39
1

can you be more specific – SmashCode Feb 17 '16 at 02:39
I receive a float number like 3.2 – Helio Soares Junior Feb 17 '16 at 02:39
1

Let us [continue this discussion in chat](http://chat.stackoverflow.com/rooms/103667/discussion-between-smashcode-and-helio-soares-junior). – SmashCode Feb 17 '16 at 02:40
3

@Helio, I think the problem here is that BigDecimal instances are immutable. `precoDecial.setScale(2, BigDecimal.ROUND_HALF_UP);` doesn't change precoDecial state, you should do something like `precoDecial = precoDecial.setScale(2, BigDecimal.ROUND_HALF_UP);` – Wagner Tsuchiya Feb 17 '16 at 03:57
Another comment here is that if you just want to print it or convert it to a String this approach should be better: [http://stackoverflow.com/questions/10269045/format-a-bigdecimal-as-string-with-max-2-decimal-digits-removing-0-on-decimal-p] – Wagner Tsuchiya Feb 17 '16 at 04:00
@WagnerTsuchiya tank you *-* i not repared this *-* but i used this: – Helio Soares Junior Feb 17 '16 at 04:03
`precoDecial.round(new MathContext(2, RoundingMode.HALF_UP)).setScale(2, BigDecimal.ROUND_HALF_UP)` – Helio Soares Junior Feb 17 '16 at 04:03
@Helio: it worked, but it would have worked without the call to `round()` as well. The real problem is what Wagner wrote: `setScale` does not modify the BigDecimal it is called on, it returns a new BigDecimal with the desired value. – Rudy Velthuis Feb 17 '16 at 08:50

How to round BigDecimal to return two decimal

1 Answers1