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

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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.

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