Main.java Source code

Introduction

Here is the source code for Main.java

Source

//package com.java2s;
//License from project: Open Source License 

public class Main {
    public static boolean validateCardNumber(String n) {
        n = n.replace(" ", "");
        int j = n.length();

        String[] s1 = new String[j];
        for (int i = 0; i < n.length(); i++)
            s1[i] = "" + n.charAt(i);

        int checksum = 0;

        for (int i = s1.length - 1; i >= 0; i -= 2) {
            int k = 0;

            if (i > 0) {
                k = Integer.valueOf(s1[i - 1]) * 2;
                if (k > 9) {
                    String s = "" + k;
                    k = Integer.valueOf(s.substring(0, 1)) + Integer.valueOf(s.substring(1));
                }
                checksum += Integer.valueOf(s1[i]) + k;
            } else
                checksum += Integer.valueOf(s1[0]);
        }

        return ((checksum % 10) == 0);
    }
}