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//---------------------------------------------------------
// Checks for valid credit card number using Luhn algorithm
//---------------------------------------------------------

public abstract class LuhnCheck {

//--------------------------------
// Filter out non-digit characters
//--------------------------------

private static String getDigitsOnly (String s) {
StringBuffer digitsOnly = new StringBuffer ();
char c;
for (int i = 0; i < c =" s.charAt" digitsonly =" getDigitsOnly" sum =" 0;" digit =" 0;" addend =" 0;" timestwo =" false;" i =" digitsOnly.length">= 0; i--) {
digit = Integer.parseInt (digitsOnly.substring (i, i + 1));
if (timesTwo) {
addend = digit * 2;
if (addend > 9) {
addend -= 9;
}
}
else {
addend = digit;
}
sum += addend;
timesTwo = !timesTwo;
}

int modulus = sum % 10;
return modulus == 0;

}

//-----
// Test
//-----

public static void main (String[] args) {
String cardNumber = "4408 0412 3456 7890";
boolean valid = LuhnCheck.isValid (cardNumber);
System.out.println (cardNumber + ": " + valid);
cardNumber = "4408 0412 3456 7893";
valid = LuhnCheck.isValid (cardNumber);
System.out.println (cardNumber + ": " + valid);
cardNumber = "4417 1234 5678 9112";
valid = LuhnCheck.isValid (cardNumber);
System.out.println (cardNumber + ": " + valid);
cardNumber = "4417 1234 5678 9113";
valid = LuhnCheck.isValid (cardNumber);
System.out.println (cardNumber + ": " + valid);
}

}