Removing trailing zeros from BigDecimal in Java

Question

I need to remove trailing zeros from BigDecimal along with RoundingMode.HALF_UP. For instance,

Value        Output

15.3456  <=&         


        

Answer 1

Note that stripTrailingZeros() doesn't do very well either.

On this:

val = new BigDecimal("0.0000").stripTrailingZeros();
System.out.println(val + ": plain=" + val.toPlainString());

val = new BigDecimal("40.0000").stripTrailingZeros();
System.out.println(val + ": plain=" + val.toPlainString());

val = new BigDecimal("40.50000").stripTrailingZeros();
System.out.println(val + ": plain=" + val.toPlainString());

Output (Java 7):

0.0000: plain=0.0000
4E+1: plain=40
40.5: plain=40.5

Output (Java 8):

0: plain=0
4E+1: plain=40
40.5: plain=40.5

The 0.0000 issue in Java 7 is fixed in Java 8 by the following java fix.