Check digit algorithms

A check digit algorithm works by adding an extra digit, called the check digit, which is calculated from the other digits in the number using a mathematical formula. These algorithms help catch common mistakes like mistyped, missing, or transposed digits.

Algorithms:

• Damm algorithm
• Luhn algorithm
• Verhoeff algorithm

Getting started

We need to create a Java file to contain the following code:

package demo;

import io.github.aochoae.checkdigit.LuhnCheckDigit;

public class App {

    public static void main(String args[]) {

        LuhnCheckDigit checkDigit = new LuhnCheckDigit();

        System.out.println(checkDigit.generate("4872148"));

    }
}

The output must be

48721484

Declare dependencies

Add the following dependency to your project:

Gradle

dependencies {
    implementation 'io.github.aochoae:checkdigit-algorithms:2.1.2'
}

Maven

<dependencies>
    <dependency>
        <groupId>io.github.aochoae</groupId>
        <artifactId>checkdigit-algorithms</artifactId>
        <version>2.1.2</version>
    </dependency>
</dependencies>

License

Copyright 2020- Luis A. Ochoa

This project is licensed under the Apache License, Version 2.0. See LICENSE for the full license text.