I apologise if this has already been covered.

How would I validate currency input from a JTextField. For example, to
ensure that a currency value was input in a currency format ##.##
instead of ####.

I've tried using matching with regex's but that didnt work very well.
It was able to ensure that the dot (.) was entered but allow more that
2 numbers after the dot.

Below is a class I created to handle currency validation.

public class CurrencyInput extends Input
{

   /** Creates a new instance of CurrencyInput */
   public CurrencyInput(String input)
   {
       super(input);
   }

   /** Currency regex format */
   private String currencyFormat()
   {
       return "[\\d]+[.][\\d][\\d]";
   }

   private boolean isCurrency()
   {
       boolean isCurrency = false;

       if (match(currencyFormat()))
           isCurrency = true;

       return isCurrency;
   }

   /** Determines whether the currency is in the correct format and
if it is valid */
   public boolean isCurrencyValid()
   {
       boolean isCurrencyValid = false;

       if (isCurrency())
           if (Double.parseDouble(input) > 0)
               isCurrencyValid = true;

       return isCurrencyValid;
   }

}

I apprecaite any assistance that is provided.