Package edu.cnm.deepdive

Class Luhn

java.lang.Object

edu.cnm.deepdive.Luhn

public abstract class Luhn
extends Object

This class defines a single static method, isValid(String) method, which implements the Luhn algorithm to check the validity of a String of digits. Implementation of this method is included in the practical exam problems of the Deep Dive Coding Java training programs.

Method Summary

Modifier and Type	Method	Description
static boolean	isValid(String digits)	Performs a check-digit validation of the provided digit string, using the Luhn algorithm.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Method Details

isValid

public static boolean isValid(String digits)
                       throws IllegalArgumentException

Performs a check-digit validation of the provided digit string, using the Luhn algorithm. digits must contain only digit characters, whitespace, and punctuation characters, or IllegalArgumentException is thrown.

Parameters:

digits - String of digit characters.

Returns:

true if digits is valid; false otherwise.

Throws:

IllegalArgumentException - If digits contains any alphabetic characters.