CardLayout wont go to the next card

Hi,
I have a JPanel with a cardLayout, however when i try to go to the next card nothing happens. Here is my code:

Code :

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01	import java.applet.*;
02	import java.awt.*;
03	import java.util.*;
04	import java.awt.event.*;
05	import javax.swing.JEditorPane;
06	import javax.swing.*;
07	public class FindAddApplet extends Applet implements ActionListener
08	{
09	    private JLabel jcomp1;
10	    private JButton nextButton;
11	    private JButton prevButton;
12	    private JPanel contentPanel;
13	    //content layout
14	    private CardLayout cardLayout;
15	    //jpanel cards
16	    ClassYearCard classYear;
17	    PeriodCard periodCard;
18	    //labels for cards
19	    private int currentLabel = 0;
20	    String classYearLabel = ("card1");
21	    String periodCardLabel = ("card2");
22	     
23	    public void init() {
24	        //construct components
25	        cardLayout = new CardLayout();
26	        jcomp1 = new JLabel ("Main Page");
27	        nextButton = new JButton ("Next >");
28	        prevButton = new JButton ("< Previous");
29	        contentPanel = new JPanel ();
30	        classYear = new ClassYearCard();
31	        periodCard = new PeriodCard();
32	   
33	        //adjust size and set layout
34	        setPreferredSize (new Dimension (415, 414));
35	        setLayout (null);
36	 
37	        //add components
38	        add (jcomp1);
39	        add (nextButton);
40	        nextButton.addActionListener(this);
41	        add (prevButton);
42	        add (contentPanel);
43	        contentPanel.setLayout(cardLayout); //sets layout of contentPanel
44	         
45	        //set content layout
46	         
47	        //add stuff to panel
48	        contentPanel.add(classYear, classYearLabel);
49	        contentPanel.add(periodCard, periodCardLabel);
50	         
51	        //set component bounds (only needed by Absolute Positioning)
52	        jcomp1.setBounds (25, 5, 100, 25);
53	        nextButton.setBounds (295, 375, 110, 25);
54	        prevButton.setBounds (175, 375, 110, 25);
55	        contentPanel.setBounds (15, 30, 390, 340);
56	    }
57	 
58	    public void start() {
59	    }
60	     
61	    public void actionPerformed(ActionEvent e){
62	        if (e.getSource() == "nextButton"){
63	            cardLayout.show(contentPanel, "card2");
64	        }
65	    }
66	 
67	    public void stop() {
68	    }
69	 
70	    public void destroy() {
71	    }
72	     
73	}

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When i click the next button the panel just stays what it is currently, do i need to do something like repaint the contentPanel?
Thanks,
x5

Quote:

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if (e.getSource() == "nextButton"){

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This test is suspect.
What does the getSource() method return? Check if it is a String. Do you mean to use a variable there?

You should use the equals() method when comparing the contents of two objects like Strings and not the == operator.

Hey,
You are right, i was comparing it to a string rather than the variable name,
Thanks