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

/**
 * Base class for all our buttons
 */
public abstract class Button extends JButton implements ActionListener {
    protected Square square; 
    protected Square.ButtonAction action; 

    public Button (Square square, Square.ButtonAction action) {
	this.square = square; 
	this.action = action; 
	setBorder (new LineBorder(Color.GREEN, 2)); 
	addActionListener (this); 
    }

    public void actionPerformed (ActionEvent e) { 
	square.doAction (action); 
    }
}