ArrayList problems

[komo225]

Hey i'm getting aL

Exception in thread "main" java.lang.NullPointerException
at Deck.<init>(Deck.java:24)
at Poker.main(Poker.java:13)

when i try to run my client program to my poker game. It builds fine. so i went to my deck file and when i run that, i get:

java.lang.NoSuchMethodError: main
Exception in thread "main"

error when i try to run my Deck file. but it builds fine.

/**
* Poker.java

*
* @author
* @version 1.00 2007/10/2
*/

public class Poker {

public static void main(String[] args) {

Deck theDeck = new Deck();
System.out.println (theDeck);
theDeck.shuffle();
System.out.println (theDeck);

FiveCardHands playerHand = new FiveCardHands(theDeck.deal(5));
FiveCardHands houseHand = new FiveCardHands (theDeck.deal(5));

System.out.println ("Player's Hand: " + playerHand);

System.out.println ("House Hand: " + houseHand);

System.out.println ("\nThe deck: " + theDeck);
}
}

/**
* period 3
* 2/1/09
*
*
* 209195
*/

import java.util.Random;
import java.util.ArrayList;

public class Deck {

private ArrayList <Card> myCards;
private ArrayList <Card> shuffled;
private Random randomGen = new Random();


public Deck ()
{
for(int i = 0; i < 52; i ++)
{
Card x = new Card(i);
myCards.add(i, x); //This is line 24!!
}

}

public void shuffle ()
{

for(int i = 0; i < 52; i++)
{
int ranNum = randomGen.nextInt(myCards.size());
shuffled.add(myCards.get(ranNum));
myCards.remove(ranNum);
}

// places cards in random order
// this is tricky, think before you code!!
}

public String toString ()
{
String temp = "Hand is [";
for(int count = 0; count < shuffled.size(); count ++)
{
temp = temp + shuffled.get(count);
if ((shuffled.size() - count) > 1)
temp = temp + ", ";
}
temp =temp + "]";
return temp;
}

public ArrayList <Card> deal (int numCards)
{
ArrayList <Card> dealt = new ArrayList<Card>(numCards);
for(int i = 0; i < numCards; i ++)
{
dealt.add(shuffled.get(i));
shuffled.remove(i);
}
return dealt;
}
}

[CJSLMAN]

The deck class can't run by itself (because it doesn't have a main method). The deck class gets instantiated by the Poker class so you can call the methods in the Deck class:

Deck theDeck = new Deck();
theDeck.shuffle();

Luck,
CJSL

[komo225]

yeah, i understand that, but why won't my poker file run? it says there is a problem with my myCards.add(x); line

[CJSLMAN]

Is it ?...

myCards.add(i, x);

or

myCards.add(x);

Luck,
CJSL

EDIT: now that I've looked at the code better, I think it should be the second one (hint, hint, hint) ... :-)

[Eranga]

Can you show your class name Card. As CJSL mentioned in the above post, something wrong with the arguments passing.