How to resolve ArrayIndexOutOfBoundsException?

Question

I have been trying to create a deck of cards using this code:

public DeckOfCards()
{
    //constructor fills deck of Cards 
        String faces[] = { "Ace", "Deuce", "Three", "Four", "Five", "Six", "Seven", "Eight", "Nine", "Ten", "Eleven", "Twelve" }; 
        String suits[] = { "Hearts", "Diamonds", "Clubs", "Spades" }; 

        deck = new Cards[ NUMBER_OF_CARDS ]; 
        currentCard = 0; 
        randomNumbers = new Random(); 

        //populate deck with Card objects 
        for( int count = 0; count < deck.length; count++ )
            deck[ count ] = 
                    new Cards( faces[ count % 13 ], suits[ count / 13 ] ); 
    } //end DeckOfCard constructor

Yet, there is one error that I just cannot fix. It pops out like this: Exception in thread "main" java.lang.ArrayIndexOutOfBoundsException at:

      for( int count = 0; count < deck.length; count++ )
        deck[ count ] = 
        new Cards( faces[ count % 13 ], suits[ count     / 13 ] );

Why does this error keep showing up? Any help will be greatly appreciated.

You don't have King in faces array. And why are you naming Eleven instead of Jack? — Rohit Jain
– Rohit Jain, Commented Mar 15, 2015 at 15:12

bwegs · Accepted Answer · 2015-03-15 15:17:40Z

1

You're missing a card (Thirteen/King) in your faces[] array. Right now count % 13 will give you an array out of bounds error when it returns 12 because your array only has 12 elements [0-11]. Either add a Thirteen to your faces array or reduce your modulus value from 13 to 12.

edited Mar 15, 2015 at 15:17

answered Mar 15, 2015 at 15:11

bwegs

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