Main.java Source code

Introduction

Here is the source code for Main.java

Source

//package com.java2s;

public class Main {
    public static boolean isLuhnValid(String input) {

        if (input.length() >= 10) {
            int sum = 0;
            boolean alternate = false;
            for (int i = input.length() - 1; i >= 0; i--) {
                int num = Character.getNumericValue(input.charAt(i));
                if (!alternate) {
                    num = num * 1;
                } else {
                    num = num * 2;
                }
                if (num > 9) {
                    num -= 9;
                }

                sum += num;
                alternate = !alternate;
            }
            return (sum % 10 == 0);
        }

        return false;

    }
}