ItemListener: Exception in thread "AWT-EventQueue-1"

[Natalie Green]

I'm getting following errors when trying to implement ItemListener:

Exception in thread "AWT-EventQueue-1" java.lang.ClassCastException: java.awt.Checkbox cannot be cast to java.awt.Choice
at SurveyApplet.itemStateChanged(SurveyApplet.java:68)


Please, advise:

import java.awt.*;
import java.awt.event.*;
import java.applet.Applet;
import java.awt.Choice;
import java.awt.Checkbox;

public class SurveyApplet extends Applet implements ItemListener{

  Dukes myDuke;
  FriendDuke fDuke;
  String action;
  String friend;
  Graphics g;
  Checkbox isFriend;
  Choice actionList;
  //String friend = "../../images/duke/dukeWave.gif";
  
  public void init() {
  
  setLayout(new FlowLayout(FlowLayout.LEFT, 10, 10));
  add(new Label("Which Duke do you like more?"));
    
  Choice actionList = new Choice();
  actionList.add("Choose Duke");
  actionList.add("Waving Duke");
  actionList.add("Thinking Duke");
  actionList.add("Writing Duke");
  
  actionList.addItemListener(this);
  add(actionList);

  myDuke = new Dukes();
  action = myDuke.getActionImage();
  
  fDuke = new FriendDuke();
  friend = fDuke.getFriendImage();
 
  
  Checkbox isFriend = new Checkbox("Add friends to Your Duke");
  add(isFriend);
  isFriend.addItemListener(this);
  
  
  resize(350,250);
  } 
  
  public void paint(Graphics g) {
    this.g = g;
    Image actionChoice = getImage(getDocumentBase(), action); 
    g.drawImage(actionChoice, 20, 100, Color.white, this);
    
    Image friendCheckbox = getImage(getDocumentBase(), friend);
    g.drawImage(friendCheckbox, 100, 100, Color.white, this); 
  }
  
  public void itemStateChanged(ItemEvent evt){  

    if (evt.getItem() == isFriend) 
      fDuke.setFriend(); 
    else {friend = fDuke.setFriend();
    }
    
    if (evt.getItem() == actionList) 
    myDuke.getActionImage();
  
    else {     
   
 int which = ((Choice)evt.getItemSelectable()).getSelectedIndex();
   switch (which)
      {
      case 0: action= ""; break;
      case 1: action= myDuke.WavingDuke(); break;
      case 2: action= myDuke.ThinkingDuke(); break;
      case 3: action= myDuke.WritingDuke(); break;      
      }
   }
    
    repaint();
 }
}

[Tony Docherty]

When you get this sort of problem it's best to read the API docs for the class to see what type the method actually returns. The docs say the getItemSelectable() method returns an object of type ItemSelectable (which in your case is the JCheckbox) but you are trying to cast it to a type Choice, which it isn't.