ChangeListener cannot be resolved to a type

[Hugh Roarty]

It's been a while since I've grappled with Java so I'm a bit rusty. I've got a feeling there may be a simple explanation to my problem...

My 'TestPanel' class extends JPanel. In the constructor for 'TestPanel' I have added a JSlider object called 'slider' to my panel. I now wish to write a private class called 'SliderListener' that implements ChangeListener then I can add a listener to my slider.

Unfortunately my IDE tells me that ChangeListener cannot be resolved to a type. Have I imported the correct packages or is there some other reason ChangeListener is not recognised?

Here is my code...

package org.superwrap;

import javax.swing.*;
import java.awt.*;
import java.awt.event.*;

public class TestPanel extends JPanel{
	
	private JSlider slider = new JSlider(0,100);
	
	public TestPanel(){
				
		slider.setMajorTickSpacing(20);
		slider.setMinorTickSpacing(5);
		slider.setPaintTicks(true);
		slider.setPaintLabels(true);
		this.add(slider);
		
		slider.addChangeListener(new SliderListener());
	}	
	
	
	private class SliderListener implements ChangeListener{
		
		public void stateChanged (ChangeEvent e){
			
			//do something when I move the slider
		}
	}
}

[Darryl Burke]

Hugh Roarty wrote:Unfortunately my IDE tells me that ChangeListener cannot be resolved to a type. Have I imported the correct packages or is there some other reason ChangeListener is not recognised?

Have you looked up the API for ChangeListener? You'll find the package mentioned there. (Hint: no, you haven't imported it.)

[Hugh Roarty]

Thanks Darryl,

Its so long since I've wrote code that I forgot how useful the API is...

import javax.swing.event.*;