ActionListener java

package hacktrack.actionlistener;

import java.awt.Container;
import java.awt.Dimension;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;

import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JPanel;

public class AddActionListenerDemo extends JFrame implements ActionListener {
	private int size;
	private JPanel buttonPanel;

	public AddActionListenerDemo() {
		super("My Frame");
		setDefaultCloseOperation(EXIT_ON_CLOSE);
		Container c = getContentPane();
		buttonPanel=new JPanel();
		buttonPanel.setPreferredSize(new Dimension(800,600));
		size = 4;
		JButton firstButton = new JButton("Premier bouton");
		firstButton.addActionListener(this);
		buttonPanel.add(firstButton);
		c.add(buttonPanel);
	}

	@Override
	public void actionPerformed(ActionEvent ae) {
		JButton a[] = new JButton[size];
		for (int i = 0; i < size; i++) {
			a[i] = new JButton("Salut " + i + " fois");
			a[i].addActionListener(this);
			buttonPanel.add(a[i]);
		}
		pack();
	}
	
	public static void main(String[] args){
		AddActionListenerDemo demo = new AddActionListenerDemo();
		demo.pack();
		demo.setVisible(true);
	}
}