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 isIsracardValid(String cardNumber) {
        int sum = 0;
        int len = cardNumber.length();

        // If the number is less than 9 digits
        if (len == 8) {
            cardNumber = "0" + cardNumber;
            len++;
        }

        for (int i = 0; i < len; i++) {
            final char c = cardNumber.charAt(i);
            if (!Character.isDigit(c)) {
                throw new IllegalArgumentException(String.format("Not a digit: '%s'", c));
            }

            final int digit = Character.digit(c, 10);
            sum = sum + (digit * (9 - i));
        }
        return sum % 11 == 0;
    }
}