JSlider

To use a slider, we need a few changes:

Look at code below:

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

import java.awt.event.*;
//by Ahmed

//notice that I say implements changelistener not actionlistener, this is to say that I will be listening for changes to slider
public class SliderExample extends JApplet implements ChangeListener  
{
    //adding jslider takes in horizontal or vertical and min value, max value and  initial value marked. 
    JSlider weightSlider= new JSlider (JSlider.HORIZONTAL, 100,200,150);

    //init is a method that gets called automatically when the applet starts or initializes
    //in init we are adding our swing components to the applet
    public void init()
    {
        Container screen = getContentPane();
        screen.setBackground(Color.white);
        screen.setLayout (new FlowLayout() );
        screen.add(weightSlider);

        weightSlider.addChangeListener(this);  
    }

    //change listener needs statechanged
    public void stateChanged(ChangeEvent e)
    {
        Object source = e.getSource();
        if (source==weightSlider)
        {
            int weight=weightSlider.getValue();
        }

       
    }
}