java - How to display a number with always 2 decimal points using BigDecimal?

Question

I am using BigDecimal to get some price values. Requirement is something like this, what ever the value we fetch from database, the displayed valued should have 2 decimal points.

Eg:

fetched value is 1 - should be displayed as 1.00
fetched value is 1.7823 - should be displayed as 1.78

I am using setScale(2, BigDecimal.ROUND_HALF_UP) but still some places, if the data from DB is a whole number then the same is being displayed !!

I mean if the value is 0 from DB its displayed as 0 only. I want that to be displayed as 0.00

Thanks

Answer 1

BigDecimal is immutable, any operation on it including setScale(2, BigDecimal.ROUND_HALF_UP) produces a new BigDecimal. Correct code should be

BigDecimal bd = new BigDecimal(1);
bd.setScale(2, BigDecimal.ROUND_HALF_UP); // this does change bd
bd = bd.setScale(2, BigDecimal.ROUND_HALF_UP);
System.out.println(bd);

output

1.00

Note - Since Java 9 BigDecimal.ROUND_HALF_UP has been deprecated and you should now use RoundingMode.ROUND_HALF_UP.