Changing an image to a button event.....what am i doing wrong here?

Question

I'm trying to change the image in the imagePanel when one of the buttons are clicked. When I run it, it just shows the default image i placed in there and nothing happens when a button is clicked. I'm a Java student so I'm sorry if this seems elementary. Please ignore the jbtSound button I created, i haven't got to that yet. Thanks in advance for whatever help you can offer. Here's the code:
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
public class cah334Final extends JFrame
JButton jbtFruit = new JButton("Fruit");
JButton jbtVege = new JButton("Vegetable");
JButton jbtReset = new JButton("Reset");
JButton jbtSound = new JButton("Listen");
ImageIcon imgDefault = new ImageIcon("fruits_and_vegetables.jpg");
ImageIcon imgFruit = new ImageIcon("FruitBasket.png");
ImageIcon imgVege = new ImageIcon("veggies.jpg");
//Create a panel to hold image
JPanel imagePanel = new JPanel();
public cah334Final()
//set frame layout
setLayout(new FlowLayout(FlowLayout.CENTER, 10, 20));
//add panel to hold image
add(imagePanel);
//add label and default image
imagePanel.add(new JLabel(imgDefault));
//add listeners for buttons
jbtFruit.addActionListener(new ChangeImage());
jbtVege.addActionListener(new ChangeImage());
jbtReset.addActionListener(new ChangeImage());
//add panel to hold buttons and layout panel
JPanel buttonPanel = new JPanel();
buttonPanel.setLayout(new GridLayout(2, 2, 5, 5));
//add buttons to panel
buttonPanel.add(jbtFruit);
buttonPanel.add(jbtVege);
buttonPanel.add(jbtReset);
buttonPanel.add(jbtSound);
//add button panel to frame
add(buttonPanel);
//tool tips set for the buttons
jbtFruit.setToolTipText("Click to choose a fruit");
jbtVege.setToolTipText("Click to choose a vegetable");
jbtReset.setToolTipText("Click to reset the picture");
jbtSound.setToolTipText("Click to hear a message");
}//end of constructor
public static void main(String[] args)
JFrame frame = new cah334Final();
frame.setTitle("Carol's CIS 334 Form");
frame.setSize(500, 500);
frame.setLocationRelativeTo(null);
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setVisible(true);
}//end of main
class ChangeImage implements ActionListener
public void actionPerformed(ActionEvent e)
{//HERES THE PROBLEM
if (e.getSource() == jbtFruit) //fruit button clicked
imagePanel.add(newJLabel(imgFruit)); //tried to do imagePanel.setIconImage(imgFruit); but it didn't work
else if (e.getSource() == jbtVege) //vege button clicked
imagePanel.add(new JLabel(imgVege));
else if (e.getSource() == jbtReset) //reset button clicked
imagePanel.add(new JLabel(imgDefault));
}//end of actionPerformed
}//end of ChangeImage
}//end of class

Answer 1

Thank you for your help. Sorry about the format, I'll do better next time :)
I got it to work. Here's what I came up with:
class ChangeImage implements ActionListener
     public void actionPerformed(ActionEvent e)
          if (e.getSource() == jbtFruit)
               lblimage.setIcon(imgFruit);
          else if(e.getSource() == jbtVege)
               lblimage.setIcon(imgVege);
          else if(e.getSource() == jbtReset)
               lblimage.setIcon(imgDefault);
          }//end of actionPerformed
     }//end of ChangeImageNow I just have to figure out how to add this audio clip in and I am finished!
Thank you for taking the time to read my code and help me out.