Card Layout, what is wrong?

[moxy]

I've complied my applet file sucessfully but when I hit any button, a long list of errors appear. Can anyone point me in the right direction?

(Sorry, don't know how to do a code box on this board)

//Input Card
JLabel labelInput = new JLabel ("Input", SwingConstants.CENTER);
JPanel inputCard = new JPanel();
inputCard.add (labelInput);
deck.add (inputCard, labelInput.getText());

...other cards declared like this too...

//add listeners
input.addActionListener (this);
admit.addActionListener (this);
display.addActionListener (this);

public void actionPerformed (ActionEvent event)
{

//show cards
if (event.getSource() == input)
cardManager.first(deck);
else if (event.getSource ()== admit)
cardManager.next(deck);
else if (event.getSource()==display);
cardManager.last(deck);

[sjalle]

Whatever the errors are they are not in the code you have posted here.

[moxy]

OK, I wanted to avoid posting the entire code but the error must be here somewhere.

entire code follows.
==

import java.awt.*;
import java.awt.event.*;
import javax.swing.*;

public class ApplicationCentre extends JApplet implements ActionListener
{

private JPanel main, deck;
private JLabel labelN, labelS, labelE, labelW;
private JButton input, admit, display;
private Container container;
private CardLayout cardManager;
// End of variables declaration

public void init ()
{
initComponents();
setSize(400, 100);
}//end init

public void initComponents()
{
container = getContentPane();
container.setLayout( new BorderLayout() );

// Creating instances of each item
main = new JPanel();
input = new JButton("Input");
admit = new JButton("Admit");
display = new JButton("Display");
labelE = new JLabel("East");
// End Creation

//set up main menu
main.setLayout (new GridLayout (3,0));
main.add(input);
main.add (admit);
main.add (display);

//set up deck
CardLayout cardManager = new CardLayout();
deck = new JPanel();
//deck.setLayout (cardManager);

//Input Card
JLabel labelInput = new JLabel ("Input", SwingConstants.CENTER);
JPanel inputCard = new JPanel();
inputCard.add (labelInput);
deck.add (inputCard, labelInput.getText());

//Admit Card
JLabel labelAdmit = new JLabel ("Admit");
JPanel admitCard = new JPanel();
admitCard.add (labelAdmit);
deck.add (admitCard);

//Display Card
JLabel labelDisplay = new JLabel ("Display");
JPanel displayCard = new JPanel();
displayCard.add (labelAdmit);
deck.add (displayCard);

//add listeners
input.addActionListener (this);
admit.addActionListener (this);
display.addActionListener (this);

container.add( main, BorderLayout.WEST);

container.add(deck, BorderLayout.EAST);
}//end initcomponents


//buttons!!
public void actionPerformed (ActionEvent event)
{

//show cards
if (event.getSource() == input)
cardManager.first(deck);
else if (event.getSource ()== admit)
cardManager.next(deck);
else if (event.getSource()==display);
cardManager.last(deck);
}//end button handler


}

[sjalle]

There was some problems with your use of a cardlayout

import java.awt.*;
import java.awt.event.*;
import javax.swing.*;

public class ApplicationCentre
    extends JApplet
    implements ActionListener {

  private JPanel main, deck;
  private JLabel labelN, labelS, labelE, labelW;
  private JButton input, admit, display;
  private Container container;
  private CardLayout cardManager;
  // End of variables declaration

  public void init() {
    initComponents();
    setSize(400, 100);
  } //end init

  public void initComponents() {
    container = getContentPane();
    container.setLayout(new BorderLayout());

    // Creating instances of each item
    main = new JPanel();
    input = new JButton("Input");
    admit = new JButton("Admit");
    display = new JButton("Display");
    labelE = new JLabel("East");
    // End Creation

    //set up main menu
    main.setLayout(new GridLayout(3, 0));
    main.add(input);
    main.add(admit);
    main.add(display);


    //set up deck
    //CardLayout cardManager = new CardLayout();
    // ERROR ******************
    // the above is a redeclaration, the cardManager here is local to the
    // initComponents method, the cardManager declared at class level
    // is still null

    cardManager = new CardLayout();
    deck = new JPanel(cardManager);
    //deck.setLayout (cardManager);

    //Input Card
    JLabel labelInput = new JLabel("Input", SwingConstants.CENTER);
    JPanel inputCard = new JPanel();
    inputCard.add(labelInput);
    deck.add(inputCard, "Input");

    //Admit Card
    JLabel labelAdmit = new JLabel("Admit");
    JPanel admitCard = new JPanel();
    admitCard.add(labelAdmit);
    deck.add(admitCard, "Admit");

    //Display Card
    JLabel labelDisplay = new JLabel("Display");
    JPanel displayCard = new JPanel();
    //displayCard.add(labelAdmit); // <--- ooops
    displayCard.add(labelDisplay);
    deck.add(displayCard,"Display");

    //add listeners
    input.addActionListener(this);
    admit.addActionListener(this);
    display.addActionListener(this);

    container.add(main, BorderLayout.WEST);

    container.add(deck, BorderLayout.EAST);
  } //end initcomponents

  //buttons!!
  public void actionPerformed(ActionEvent event) {

    //show cards
    if (event.getSource() == input)
      cardManager.show(deck,"Input");
    else if (event.getSource() == admit)
      cardManager.show(deck,"Admit");
    else if (event.getSource() == display)
      cardManager.show(deck,"Display");
  } //end button handler
  public static void main(String[] args) {
      JFrame f = new JFrame("Applet tester");
      f.getContentPane().setLayout(new GridLayout());
      ApplicationCentre applet = new ApplicationCentre();
      f.getContentPane().add(applet);
      applet.init();
      f.addWindowListener(new WindowAdapter() {
        public void windowClosing(WindowEvent e) {
          System.exit(0);
        }
      });
      f.setBounds(100, 100, 300, 300);
      f.setVisible(true);
    }

}

[moxy]

OK, I fixed my code as indicated above but pushing the buttons on the West still does nothing to flip the cards.

[sjalle]

Then you have missed out on a detail or two cause this code flips cards like mad
on my computer.

Check it again.

[moxy]

Got it! Thanks!