import java.awt.FlowLayout;
import java.awt.event.ActionListener;
import java.awt.event.ActionEvent;
import javax.swing.JFrame;
import javax.swing.JButton;
import javax.swing.Icon;
import javax.swing.ImageIcon;
import javax.swing.JOptionPane;

public class ButtonFrame extends JFrame {

    private JButton plainJButton;
    private JButton imageJButton;

    public ButtonFrame(){
        super("Testing Buttons");
        setLayout(new FlowLayout());

        plainJButton = new JButton ("Plain Button");
        add(plainJButton);

        Icon tim = new ImageIcon (getClass().getResource("tim.png"));
        Icon tam = new ImageIcon (getClass().getResource("tam.jpg"));
        imageJButton = new JButton ("Image Button",lucas);
        imageJButton.setRolloverIcon(tam);
        add(imageJButton);

        ButtonHandler handler = new ButtonHandler();
        plainJButton.addActionListener(handler);
        imageJButton.addActionListener(handler);
    }

    private class ButtonHandler implements ActionListener{

        public void actionPerformed(ActionEvent event){
            JOptionPane.showMessageDialog(ButtonFrame.this, String.format("You pressed: %s", event.getActionCommand()));
        }
    }
}