Format Bigdecimal in Java [duplicate]

Question

I would like to format a BigDecimal value according to the following rules:

25 => 25
25,1 => 25,10
25,10 => 25,10
25,12 = > 25,12

I have searched the forums but not found a matching question (here, here and here) and I have looked at the javadoc for BigDecimal and NumberFormat without understanding how to do this.

EDIT: Today I do:

NumberFormat currencyFormat02 = NumberFormat.getCurrencyInstance(locale);
currencyFormat02.setMinimumFractionDigits(0);
currencyFormat02.setMaximumFractionDigits(2);
currencyFormat02.setGroupingUsed(false);
BigDecimal bd = new BigDecimal("25 or 25,1 or 25,10 or 25,12");
String x =currencyFormat02.format(bd);

x should print as above but does not.

Answer 1

Probably not the most efficient but you could try something like this:

import java.math.BigDecimal;
import java.text.DecimalFormat;
import java.text.DecimalFormatSymbols;
import java.util.Locale;

class Main {
  public static void main(String[] args) {
    BigDecimal ex1 = new BigDecimal("25");
    BigDecimal ex2 = new BigDecimal("25.1");
    BigDecimal ex3 = new BigDecimal("25.10");
    BigDecimal ex4 = new BigDecimal("25.12");
    printCustomBigDecimalFormat(ex1);
    printCustomBigDecimalFormat(ex2);
    printCustomBigDecimalFormat(ex3);
    printCustomBigDecimalFormat(ex4);
  }

  public static void printCustomBigDecimalFormat(BigDecimal bd) {
    DecimalFormatSymbols symbols = new DecimalFormatSymbols(Locale.getDefault());
    symbols.setDecimalSeparator(',');
    DecimalFormat df = new DecimalFormat("##.00", symbols);
    if(containsDecimalPoint(bd)) {
      System.out.println(df.format(bd));
    } else {
      System.out.println(bd);
    }
  }

  private static boolean containsDecimalPoint(BigDecimal bd) {
    return bd.toString().contains(".");
  }
}

Output:

25
25,10
25,10
25,12

Try it here!