//HelloJFrame
//swing GUI HELLO WORLD

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

public class HelloJFrame extends JFrame implements ActionListener{
  public static void main(String args[]){
    HelloJFrame h = new HelloJFrame("My first program");
  } // end main
  
  JButton btnClickMe = new JButton("Click Me");
  JLabel lblOutput = new JLabel("");
  public HelloJFrame(String title){
    super(title);
    Component mainPanel = this.getContentPane();
    this.setLayout(new GridLayout(0, 1));
    this.add(lblOutput);
    this.add(btnClickMe);
    btnClickMe.addActionListener(this);
    
    this.show();
    this.pack();
  } // end constructor
  
  public void actionPerformed(ActionEvent e){
    lblOutput.setText("Hi there");
  }
  
} // end class