A toggle button with start and stop images

//A toggle button with start and stop images in java swing
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
class JTButton extends JFrame implements ActionListener
{
    //vars
    JToggleButton but;
    ImageIcon img1;
 
    JTButton()
    {
        //create content pane with flow layout
        Container c = getContentPane();
        c.setLayout(new FlowLayout());
 
        //image with start signal
        img1 = new ImageIcon("start.jpg");

        //create toggle button with start image
        but = new JToggleButton("Start/Stop", img1);

        //add button to content pane
        c.add(but);

        //add action listener to button
        but.addActionListener(this);
    }

    public void actionPerformed(ActionEvent ae)
    {
        //image with stop signal
        ImageIcon img2 = new ImageIcon("stop.jpg");

        //if toggle button is selected display stop signal image
        //else display start signal image
        if(but.isSelected())
        but.setIcon(img2);
        else but.setIcon(img1);
  
    }

    public static void main(String args[])
    {
        //create the frame
        JTButton demo = new JTButton();
        demo.setSize(400,400);
        demo.setVisible(true);
        demo.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    }
}
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