<code java>

    public Window() {
        initComponents();
        Reaction r = new Reaction (jButton1);
        jButton1.addMouseListener(r);
    }

</code>

<code java>
package simple;

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

public class Reaction implements MouseListener
{
    private JButton button;
    
    public Reaction (JButton b)
    {
        button = b;
    }
    
    public void mouseClicked(MouseEvent e) 
    {
        button.setText ("clicked");
    }

    public void mousePressed(MouseEvent e) 
    {
        button.setText ("pressed");
    }

    public void mouseReleased(MouseEvent e) 
    {
        button.setText ("released");
    }

    public void mouseEntered(MouseEvent e) 
    {
        button.setText ("entered");
    }

    public void mouseExited(MouseEvent e) 
    {
        button.setText ("exited");
    }
    
}


</code>