Winston Tutorial 4-5

/*
 Links:
 https://stackoverflow.com/questions/9543320/how-to-position-the-form-in-the-center-screen
 https://www.youtube.com/watch?v=mjOicuXEvwg
 */

package com.samkough.main;

import java.awt.*;
import java.awt.event.*;

import javax.swing.*;

@SuppressWarnings("serial")
public class FirstGui extends JFrame
{
	private JLabel l1;
	private JLabel l2;
	private JButton b1;
	private JButton b2;
	private int x = 0, y = 0;

	public FirstGui()
	{
		setLayout(new FlowLayout());

		b1 = new JButton("Button 1");
		add(b1);

		b2 = new JButton("Button 2");
		add(b2);

		l1 = new JLabel("");
		add(l1);

		l2 = new JLabel("");
		add(l2);

		Gui e = new Gui();
		b1.addActionListener(e);

		Gui2 ev = new Gui2();
		b2.addActionListener(ev);
	}

	public class Gui implements ActionListener
	{
		@Override
		public void actionPerformed(ActionEvent e)
		{
			if (x == 0)
			{
				l1.setText("This is Button 1.");
				x = 1;
			}
			else if (x == 1)
			{
				l1.setText("");
				x = 0;
			}
		}

	}

	public class Gui2 implements ActionListener
	{
		public void actionPerformed(ActionEvent e)
		{
			if (y == 0)
			{
				l2.setText("This is Button 2.");
				y = 1;
			}
			else if (y == 1)
			{
				l2.setText("");
				y = 0;
			}
		}
	}

	public static void main(String args[])
	{
		FirstGui frame = new FirstGui();

		frame.setVisible(true);
		frame.setSize(200, 200);
		frame.setTitle("First Gui");
		frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
		frame.setLocationRelativeTo(null);
	}
}