Check Credit Card Validity using Luhn Algorithm

by

You can freely import the following code:

public class Luhn
{
    public static boolean Check(String ccNumber)
    {
            int sum = 0;
            boolean alternate = false;
            for (int i = ccNumber.length() - 1; i >= 0; i--)
            {
                    int n = Integer.parseInt(ccNumber.substring(i, i + 1));
                    if (alternate)
                    {
                            n *= 2;
                            if (n > 9)
                            {
                                    n = (n % 10) + 1;
                            }
                    }
                    sum += n;
                    alternate = !alternate;
            }
            return (sum % 10 == 0);
    }
}

Link reference: https://github.com/jduke32/gnuc-credit-card-checker/blob/master/CCCheckerPro/src/com/gnuc/java/ccc/Luhn.java

More Related Contents:

  1. What's the output of this code written in java?
  2. How to find size/length of an array without using library functions/variables [closed]
  3. how to replace display array list equals another array list values
  4. java.lang.arrayoutofboundexception length:10 index:10
  5. Finding the max/min value in an array of primitives using Java
  6. Convert ArrayList to String[] array [duplicate]
  7. Can I pass an array as arguments to a method with variable arguments in Java?
  8. Struts2 INPUT result: how does it work? How are conversion / validation errors handled?
  9. Generic array creation error
  10. Cannot create an array of LinkedLists in Java…?
  11. How to convert an int array to String with toString method in Java [duplicate]
  12. How to find the index of an element in an array in Java?
  13. Variable length (Dynamic) Arrays in Java
  14. How to display a svg byte array as an image in a JasperReport?
  15. ArrayIndexOutOfBoundsException when iterating through all the elements of an array
  16. How to get unique values from array
  17. How does the Java array argument declaration syntax “…” work?
  18. Is there an implementation of JSR-303 (bean validation) available?
  19. Arrays constants can only be used in initializers error
  20. Converting string arrays into Map
  21. How does one instantiate an array of maps in Java?
  22. Arrays with trailing commas inside an array initializer in Java
  23. In Java, remove empty elements from a list of Strings
  24. get closest value to a number in array
  25. XML syntax validation in Java [closed]
  26. Wav file convert to byte array in java
  27. How do you load values into a JTable so that it shows the previous values when the form is opened?
  28. Regex date validation for yyyy-mm-dd [duplicate]
  29. How to declare array elements volatile in Java?
  30. Fill an array with random numbers [duplicate]

Leave a Comment