GuiExample.java

/* Computer Programming 1
 */
 

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


public class GuiExample extends JFrame
{

 //class constructor
 public GuiExample (){
 setSize(1600,600);
 setTitle("Sample");
 setDefaultCloseOperation(EXIT_ON_CLOSE);
 Toolkit toolkit = getToolkit();
 Dimension size = toolkit.getScreenSize();
 setLocation(size.width/2 - getWidth()/2, size.height/2 - getHeight()/2);

 }
	public static void main(String[] args) {
 
 GuiExample simple = new GuiExample();
 //simple.setLayout(null); // caused the panel to be hidden
 
 JPanel panel = new JPanel();
 
 simple.getContentPane().add(panel);
 //panel.setLayout(null);
 
 JButton btn = new JButton("beep");
 btn.setBounds(150,60,80,80);
 panel.add(btn);
 panel.add(new JButton("hi there"));
 btn.addActionListener(new ActionListener() {
 public void actionPerformed(ActionEvent event) {
 //JButton btn1 = new JButton("hello");
 //btn1.setBounds(200,120,80,80);
 //panel.add(new JButton("hi there"));
 }
 });
 simple.setVisible(true);
 
 }
 }