ItemListener not working

Question

hi i am constructing an interface and i need to use the ItemListener for my radio buttons. when i add this to the code and do a test compile it gives me the following error:
F:\My Documents\Work\Uni\CNE1\Java\Semester 2\Remidial Assignment\Buttons>javac
ass.java
ass.java:13: cannot resolve symbol
symbol : class ItemListener
location: class ass
public class ass extends JApplet implements ChangeListener, ItemListener {
^
1 error
Thanks for any help
here is the source code:
/*     CNE Level 1 */
/*     Remedial Assignment     */
/*     Date: 4/08/03 */
/*     Author: Patrick Louis-Jean */
import java.awt.*;
import javax.swing.*;
import javax.swing.event.*;
public class ass extends JApplet implements ChangeListener, ItemListener {
     JRadioButton Circle, Rect, Triangle;
     JLabel Radius, Width, Height, Base;
     JSlider RADIUS, WIDTH, HEIGHT;
     JButton button;
     Container contentArea;
     public void init(){
          contentArea = this.getContentPane();
          FlowLayout layout=new FlowLayout();
          contentArea.setLayout(layout);
          Circle = new JRadioButton("Circle");
          Rect = new JRadioButton("Rectangle ");
          Triangle = new JRadioButton("Triangle");
          Radius = new JLabel("Radius");
          Width = new JLabel("Width");
          Height = new JLabel("Height");
          Base = new JLabel("Base");
          RADIUS = new JSlider(0,100);
                    RADIUS.setMajorTickSpacing(10);
                    RADIUS.setMinorTickSpacing(5);
                    RADIUS.setPaintTicks(true);
                    RADIUS.setPaintLabels(true);
          RADIUS.addChangeListener(this);
          WIDTH = new JSlider(0,100);
                    WIDTH.setMajorTickSpacing(10);
                    WIDTH.setMinorTickSpacing(5);
                    WIDTH.setPaintTicks(true);
                    WIDTH.setPaintLabels(true);
          WIDTH.addChangeListener(this);
          HEIGHT = new JSlider(0,100);
                    HEIGHT.setMajorTickSpacing(10);
                    HEIGHT.setMinorTickSpacing(5);
                    HEIGHT.setPaintTicks(true);
                    HEIGHT.setPaintLabels(true);
          HEIGHT.addChangeListener(this);
          contentArea.add(Circle);
          contentArea.add(Rect);
          contentArea.add(Triangle);
          contentArea.add(Radius);
          contentArea.add(RADIUS);
          contentArea.add(Width);
          contentArea.add(WIDTH);
          contentArea.add(Height);
          contentArea.add(HEIGHT);
          //contentArea.add(HEIGHT);
          setContentPane(contentArea);
          public void stateChanged(ChangeEvent event){
               if(event.getSource()==RADIUS){
                    Radius.setText("Radius: "+RADIUS.getValue());
               if(event.getSource()==WIDTH){
                    Width.setText("Width: "+WIDTH.getValue());
               if(event.getSource()==HEIGHT){
                    Height.setText("Height: "+HEIGHT.getValue());

Answer 1

Just worked that out after an hour of stressing. i needed java.awt.event.*
Thanks anyway good to know that there are people who reply so fast. this forum is great.