Untitled

import java.awt.event.ActionEvent;
import java.awt.GridLayout;
import java.awt.event.ActionListener;

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

public class MyFrame extends JFrame implements ActionListener {
	
	MyFrame () {
		System.out.println("Hi");
		
		this.setLayout(new GridLayout(2,2,10,10));
		
		JButton button = new JButton("Button");
		JButton button2 = new JButton("Button2");
		JButton button3 = new JButton("Button3");
		JButton button4 = new JButton("Button4");
	
		this.add(button);
		this.add(button2);
		this.add(button3);
		this.add(button4);
//		button.addActionListener(this);
		
		button.addActionListener(new ActionListener() {
			@Override
			public void actionPerformed(ActionEvent event) { System.out.println("Hello world!");
			} });
		
		this.setSize(400,400);
		this.setVisible(true);
		
	
	}
	
	

	
 	public void actionPerformed(ActionEvent arg0) {
		System.out.println("Button - actionPerformed");
 	}
	

;
}