Error in adding a Tab to a JFrame

Question

Hi.. I am getting this error when I compile the following piece of code.. Could anyone help me with the error plz..
C:\Documents and Settings\Ravaboli\Desktop\new testing\CopyDetectionFrame.java:24: addTab(java.lang.String,javax.swing.JPanel) in CopyDetectionFrame cannot be applied to (java.lang.String,InternetPlagiarismTab)
          addTab("Internet Plagiarism Detector", new InternetPlagiarismTab());
^
C:\Documents and Settings\Ravaboli\Desktop\new testing\CopyDetectionFrame.java:25: addTab(java.lang.String,javax.swing.JPanel) in CopyDetectionFrame cannot be applied to (java.lang.String,CollusionDetectorTab)
          addTab("Collusion Detection", new CollusionDetectorTab());
^
2 errors
Tool completed with exit code 1
CollusionDetectorTab and InternetPlagiarismTab are already functioning..which I have already created
The code:
import javax.swing.*;
import java.awt.event.*;
import java.util.*;
import java.io.*;
public class CopyDetectionFrame extends JFrame
     private ArrayList tabs;
     private JTabbedPane jtb;
     public CopyDetectionFrame()
          // set JFrame stuff
          setLocation(200,200);
          setSize(800, 600);
          setTitle("Copy Detector");
          setDefaultCloseOperation(EXIT_ON_CLOSE);
          // Make tabs
          jtb = new JTabbedPane();
          tabs = new ArrayList();
          if("true".equals(Config.read("showhome")))
          addTab("Internet Plagiarism Detector", new InternetPlagiarismTab());
          addTab("Collusion Detection", new CollusionDetectorTab());
          getContentPane().add(jtb);
          // create some basic menus
          JMenuBar jmb = new JMenuBar();
          setJMenuBar(jmb);
          JMenu file = new JMenu("File");
          JMenuItem quit = new JMenuItem("Quit");
          quit.addActionListener(new ActionListener() {
               public void actionPerformed(ActionEvent ae) {
                    cleanup();
                    System.exit(0);
          file.add(quit);
          jmb.add(file);
          addWindowListener(new WindowAdapter() {
               public void windowClosing(WindowEvent we) {
                    cleanup();
     public void addTab(String title, JPanel ot)
          jtb.add(title, ot);
          tabs.add(ot);
     private void cleanup()
          for(int i = 0; i < tabs.size(); i++)
          try
//               ((OptionTab)tabs.get(i)).cleanup();
          catch(Exception e) {}
     public static void main(String[] args)
          JFrame.setDefaultLookAndFeelDecorated(true);
          JDialog.setDefaultLookAndFeelDecorated(true);
          try
               UIManager.setLookAndFeel("javax.swing.plaf.metal.MetalLookAndFeel");
          catch (Exception ex)
               System.out.println("Failed loading L&F: ");
               System.out.println(ex);
          new CopyDetectionFrame().show();
}

Answer 1

For that code to work, your two Tabs (InternetPlagiarismTab and CollusionDetectionTab) would need to extend JPanel. Do they?
i.e.:
class InternetPlagiarismTab extends JPanel { ... }