Need help with BlackJack Program

Im doing a BlackJack Program and I keep getting the java.lang.NullPointerException. Can somebody please help me, I'm so lost

Heres the Main Program:


import java.util.Collections;
import java.util.Vector;


public class BJGame {

private Vector<Card> deck;
private Vector<Card> playerCards;
private Vector<Card> dealerCards;

private int playerPoint;
private int dealerPoint;

private boolean gameEnd;



/*
* result equals to
* 0 - tie game
* 1 - player wins
* -1 - player loses
*/
private int result;

public BJGame() {

// Initialize properties
Vector<Card> deck= new Vector<Card>(52);
Vector<Card> playerCards=new Vector<Card>();
Vector<Card> dealerCards=new Vector<Card>();
playerPoint=0;
dealerPoint=0;
gameEnd=true;
result=0;

// Generate a deck of cards
generateDeck();

// shuffle a deck
Collections.shuffle(deck);
}

/*
* game starts
*
*/
public void start() {

// Draw 4 cards from a deck
// add 2 cards to playerCards
// add 2 cards to dealerCards

// update playerPoints and dealerPoints
// update gameEnd and result if player or dealer // get BJ (21)

getPlayerCards();
getDealerCards();


playerPoint=getPlayerPoint();
dealerPoint=getDealerPoint();

if (playerPoint==21){
gameEnd=true;
result=1;
} else if (dealerPoint==21){
gameEnd=true;
result=-1;
} else if ((playerPoint==21)&&(dealerPoint==21)){
gameEnd=true;
result=0;
}




}

/*
* player asks for a new card
*/
public Card hit() {



// Draw a cards from a deck

Card c = drawCard();

// add it to playerCards

// update playerPoints
// update gameEnd and result if player point > 21

// return the new card

playerCards.add(c);
playerPoint=calculatePoint(playerCards);
if (playerPoint>21){
gameEnd=true;
result=-1;
}


return c;
}

/*
* player turn ends
*/
public void stand() {

// while dealer’s point < 17
// draw a card from a deck
// add it to dealerCards

// update dealerPoints
// update gameEnd and result

while (dealerPoint<17){
drawCard();
Card c=drawCard();
dealerCards.add(c);
dealerPoint=(calculatePoint(dealerCards));
if (dealerPoint>21){
gameEnd=true;
result=1;
}

}




}

/*
* Return cards in player's hand
*/
public Vector<Card> getPlayerCards() {
Card c=drawCard();
Card d=drawCard();
playerCards.add(c);
playerCards.add(d);

return playerCards;
}

/*
* Return cards in dealer's hand
*/
public Vector<Card> getDealerCards() {
dealerCards.add(drawCard());
dealerCards.add(drawCard());


return dealerCards;
}

/*
* Return point of player
*/
public int getPlayerPoint() {
return playerPoint;
}

/*
* Return point of dealer
*/
public int getDealerPoint() {
return dealerPoint;
}

/*
* Return true if the game ends, false otherwise
*/
public boolean isGameEnd() {
return gameEnd;
}

/*
* Return the result of the game
* 0 - tie game
* 1 - player wins
* -1 - player loses
*/
public int getResult() {
return result;
}

/*
* draw a card from the deck
* return a new card
*/
private Card drawCard() {
Card c = deck.get(0);
deck.remove(0);

return c;
}

/*
* calculate the total point of cards
*/
private int calculatePoint(Vector<Card> cards) {

// loop through each card to get a summation
int total = 0;
for(Card c: cards) {
total += c.getPoint();
}

// check if cards contain Aces
// if cards contain Aces and total point <= 11
// add 10 to the total point



if(playerCards.equals("A")){
if (playerPoint<=11){
playerPoint += 10;
}
}
if(dealerCards.equals("A")){
if(dealerPoint<=11){
dealerPoint += 10;
}
}




return total;
}

/*
* add 52 cards to deck variable
*/
private void generateDeck() {

char[] suits = {'C', 'D', 'H', 'S'};
String[] ranks = {"2", "3", "4", "5", "6", "7", "8", "9", "10", "J", "Q", "K", "A"};

deck=new Vector<Card>(52);
for(String r: ranks) {
for(char s: suits) {
deck.add(new Card(r,s));
}
}
}

}

Heres the Card program to setup the Cards


public class Card {

private String rank;
private char suit;

/*
* r - a rank of card: 2, 3, ..., 9, 10, J , Q, K, A
* s - a suit of card:
* 'C' for clubs
* 'D' for diamonds
* 'H' for hearts
* 'S' for spades
*/
public Card(String r, char s) {
rank = r;
suit = s;
}

/*
* Return rank of a card
*/
public String getRank() {
return rank;
}

/*
* Return suit of a card
*/
public char getSuit() {
return suit;
}

public String toString() {
String str = rank+" of ";

if(suit == 'C') {
str += "Clubs";
} else if(suit == 'D') {
str += "Diamonds";
} else if(suit == 'H') {
str += "Hearts";
} else if(suit == 'S') {
str += "Spades";
}

return str;
}

/*
* Return point for a card
* Aces will return 1
*/
public int getPoint() {

int pt;
if(rank.equals("J") || rank.equals("Q") || rank.equals("K")) {
pt = 10;
} else if (rank.equals("A")) {
pt = 1;
} else {
pt = Integer.parseInt(rank);
}

return pt;
}
}

and this is the program to run the Main program

import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.Component;
import java.awt.EventQueue;
import java.awt.FlowLayout;
import java.awt.Font;
import java.awt.GridLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.util.Vector;

import javax.swing.BoxLayout;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.SwingConstants;
import javax.swing.border.EmptyBorder;
import javax.swing.border.LineBorder;

public class BjGui {

private BJGame bjGame;
private JFrame frmCscBj;
private JPanel playerPanel;
private JPanel dealerPanel;

private JButton hitBtn;
private JButton standBtn;

private JLabel dealerPts;
private JLabel playerPts;

private JLabel winloseStatus;
private JButton btnPlayAgain;

/**
* Launch the application.
*/
public static void main(String[] args) {
EventQueue.invokeLater(new Runnable() {
public void run() {
try {
BjGui window = new BjGui();
window.frmCscBj.setVisible(true);
} catch (Exception e) {
e.printStackTrace();
}
}
});
}

/**
* Create the application.
*/
public BjGui() {
initialize();
}

/**
* Initialize the contents of the frame.
*/
private void initialize() {
frmCscBj = new JFrame();
frmCscBj.setTitle("CSC 2310 BJ");
frmCscBj.setResizable(false);
frmCscBj.setBounds(100, 100, 450, 300);
frmCscBj.setDefaultCloseOperation(JFrame.EXIT_ON_C LOSE);
frmCscBj.getContentPane().setLayout(new BorderLayout(0, 0));

JPanel cards = new JPanel();
frmCscBj.getContentPane().add(cards, BorderLayout.CENTER);
cards.setLayout(new BoxLayout(cards, BoxLayout.Y_AXIS));

dealerPanel = new JPanel();
cards.add(dealerPanel);
dealerPanel.setBorder(new EmptyBorder(10, 5, 10, 5));
dealerPanel.setBackground(Color.LIGHT_GRAY);
dealerPanel.setLayout(new GridLayout(0, 6, 5, 5));

JPanel dealer = new JPanel();
dealer.setBackground(Color.LIGHT_GRAY);
dealerPanel.add(dealer);
dealer.setLayout(new BorderLayout(0, 0));

JLabel lblDealer = new JLabel("Dealer Pts");
lblDealer.setHorizontalAlignment(SwingConstants.CE NTER);
dealer.add(lblDealer, BorderLayout.NORTH);
lblDealer.setForeground(Color.BLACK);
lblDealer.setFont(new Font("Tahoma", Font.PLAIN, 12));

dealerPts = new JLabel("?");
dealerPts.setHorizontalAlignment(SwingConstants.CE NTER);
dealerPts.setForeground(Color.BLACK);
dealer.add(dealerPts, BorderLayout.CENTER);

playerPanel = new JPanel();
cards.add(playerPanel);
playerPanel.setBorder(new EmptyBorder(10, 5, 10, 5));
playerPanel.setBackground(Color.DARK_GRAY);
playerPanel.setLayout(new GridLayout(0, 6, 5, 5));

JPanel player = new JPanel();
player.setBackground(Color.DARK_GRAY);
playerPanel.add(player);
player.setLayout(new BorderLayout(0, 0));

JLabel lblPlayer = new JLabel("Your Pts");
lblPlayer.setHorizontalAlignment(SwingConstants.CE NTER);
lblPlayer.setForeground(Color.WHITE);
lblPlayer.setFont(new Font("Tahoma", Font.PLAIN, 12));
player.add(lblPlayer, BorderLayout.NORTH);

playerPts = new JLabel("0");
playerPts.setHorizontalAlignment(SwingConstants.CE NTER);
playerPts.setForeground(Color.WHITE);
player.add(playerPts, BorderLayout.CENTER);

JPanel center_panel = new JPanel();
center_panel.setAlignmentX(Component.RIGHT_ALIGNME NT);
frmCscBj.getContentPane().add(center_panel, BorderLayout.SOUTH);
center_panel.setLayout(new BoxLayout(center_panel, BoxLayout.Y_AXIS));

JPanel game_playing_panel = new JPanel();
center_panel.add(game_playing_panel);
game_playing_panel.setLayout(new FlowLayout(FlowLayout.LEFT, 15, 5));

hitBtn = new JButton("Hit");
hitBtn.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent arg0) {
Card newCard = bjGame.hit();
addPlayerCardUI(newCard);

// update points
playerPts.setText(bjGame.getPlayerPoint() + "");

if (bjGame.isGameEnd()) {
showGameResult();
} else if (bjGame.getPlayerPoint() == 21) {
playerStand();
}
}
});
game_playing_panel.add(hitBtn);

standBtn = new JButton("Stand");
standBtn.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
playerStand();
}
});
game_playing_panel.add(standBtn);

winloseStatus = new JLabel("");
winloseStatus.setFont(new Font("Tahoma", Font.BOLD, 15));
game_playing_panel.add(winloseStatus);
winloseStatus.setVisible(false);

btnPlayAgain = new JButton("Play again ?");
btnPlayAgain.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
resetUI();
gameStart();
}
});
btnPlayAgain.setVisible(false);
game_playing_panel.add(btnPlayAgain);

gameStart();
}

private void gameStart() {

bjGame = new BJGame();

// initialize card
bjGame.start();

// display player card
for (Card c : bjGame.getPlayerCards()) {
addPlayerCardUI(c);
}
playerPts.setText(bjGame.getPlayerPoint() + "");


// display dealer card
addDealerCardUI(null);
Card secondCard = bjGame.getDealerCards().get(1);
addDealerCardUI(secondCard);

if (bjGame.isGameEnd()) {
showGameResult();
}
}

private void playerStand() {
bjGame.stand();
showGameResult();
}

/*
* add card UI to dealer panel or player panel
*/
private void addPlayerCardUI(Card cardObj) {
JPanel card = new JPanel();
card.setBorder(new LineBorder(new Color(0, 0, 0), 1, true));
card.setBackground(Color.WHITE);
card.setLayout(new BorderLayout(0, 0));

JLabel suitLabel = new JLabel(cardObj.getSuit() + " ");
suitLabel.setHorizontalAlignment(SwingConstants.RI GHT);
card.add(suitLabel, BorderLayout.NORTH);

JLabel rankLabel = new JLabel(cardObj.getRank());
rankLabel.setHorizontalAlignment(SwingConstants.CE NTER);
card.add(rankLabel, BorderLayout.CENTER);

playerPanel.add(card);
playerPanel.updateUI();
}

private void addDealerCardUI(Card cardObj) {
JPanel card = new JPanel();
card.setBorder(new LineBorder(new Color(0, 0, 0), 1, true));
card.setBackground(new Color(95, 158, 160));
card.setLayout(new BorderLayout(0, 0));

String suit;
String rank;

JLabel suitLabel = new JLabel();
JLabel rankLabel = new JLabel();

if (cardObj == null) {
rank = "?";
suit = " ";
} else {
suit = cardObj.getSuit() + " ";
rank = cardObj.getRank();
}

suitLabel.setText(suit);
suitLabel.setHorizontalAlignment(SwingConstants.RI GHT);
card.add(suitLabel, BorderLayout.NORTH);

rankLabel.setText(rank);
rankLabel.setHorizontalAlignment(SwingConstants.CE NTER);
card.add(rankLabel, BorderLayout.CENTER);

dealerPanel.add(card);
dealerPanel.updateUI();
}

private void showGameResult() {
// update cards & points
showAllDealerCards();
dealerPts.setText(bjGame.getDealerPoint() + "");

// update points
dealerPts.setText(bjGame.getDealerPoint() + "");

hitBtn.setVisible(false);
standBtn.setVisible(false);

String msg = "Tie game !";
if (bjGame.getResult() > 0) {
msg = "You win !";
} else if (bjGame.getResult() < 0) {
msg = "You lose !";
}
winloseStatus.setText(msg);

winloseStatus.setVisible(true);
btnPlayAgain.setVisible(true);
}

/*
* play again, reset all UIs
*/
private void resetUI() {
// set default score
playerPts.setText("0");
dealerPts.setText("?");

// remove player cards
while (playerPanel.getComponentCount() > 1) {
playerPanel.remove(1);
}
playerPanel.updateUI();

// remove dealer cards
clearDealerCardUI();

winloseStatus.setText("");
winloseStatus.setVisible(false);
btnPlayAgain.setVisible(false);

hitBtn.setVisible(true);
standBtn.setVisible(true);
}

// remove dealer cards
private void clearDealerCardUI() {
while (dealerPanel.getComponentCount() > 1) {
dealerPanel.remove(1);
}
dealerPanel.updateUI();
}

// update dealer cards
private void showAllDealerCards() {
clearDealerCardUI();

Vector<Card> cards = bjGame.getDealerCards();
for(Card c: cards) {
addDealerCardUI(c);
}
}
}

BB Code List - Java Programming Forum

db

Quote:

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I keep getting the java.lang.NullPointerException.

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Please post the full text of the error message.

And use the link given by Darryl to see how to repost your code in [code] tags [/code].
That lot is impossible to read.