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

class GUI extends JFrame implements ActionListener {
	public static void main(String[] args) {
		GUI window = new GUI("Title");
		//window.setLayout(new FlowLayout());
		
	}
	
	private JButton button;
	private JButton button2;
	private JButton button3;

	//Inner class
	private class ButtonListener implements ActionListener {
		public void actionPerformed(ActionEvent a) {
			System.out.println("Hello from the Inner Class");
		}
	}

	
	public GUI(String title) {
		super(title);
		 
		JPanel panel = new JPanel();
		
		setSize(400,300);
		setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
		
		add(panel, BorderLayout.SOUTH);
		
		button = new JButton("Click me!");
		button2 = new JButton("Also click me!");
		button3 = new JButton("Annother Button");
		
		button.addActionListener(this);
		button2.addActionListener(new ButtonListener() );
		
		//Anonymous Inner class
		button3.addActionListener(new ActionListener() {
			public void actionPerformed(ActionEvent ae) {
				System.out.println("Clicked button 3");
			}
		});
		
		panel.add(button);
		panel.add(button2);
		panel.add(button3);
		
		setVisible(true);
	}
	
	public void actionPerformed(ActionEvent ae) {
		if(ae.getSource() == button) {
			System.out.println("Hello world");
		}
		else if(ae.getSource() == button2) {
			System.out.println("Different output");
		}
	}
}