Adding Buttons

A skeleton of a constructor has been added to the program.

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

public class TwoButtons extends JFrame implements ActionListener
{

  JButton redButton;
  JButton grnButton;


  // constructor for TwoButtons
  public TwoButtons()                           
  {

    super( title );
    redButton = new JButton("Red");
    grnButton = new JButton("Green");

    . . . . more code will go here . . . . 
    
    setDefaultCloseOperation( JFrame.EXIT_ON_CLOSE );   

  }

  . . . . more code will go here . . . . 

  public static void main ( String[] args )
  {
    TwoButtons demo  = new TwoButtons( "Click a Button") ;
    
    demo.setSize( 200, 150 );     
    demo.setVisible( true );      
  }
}

Now remember that GUI components need to be add()ed to the container.