Answer:

How many frames are there?
- Just one.
What GUI components will it contain?
- The "Red" button and the "Green" button.
What objects generate events?
- Both buttons.
What objects receive events?
- A listener for button events.

Actually, there are many events the GUI may generate, but other than button clicks, most of those events are ignored. There are other events, such as clicking on the "close" button on the frame, that are not ignored, but are handled by the frame.

The Frame

You might have said that each button needs its own listener. That would work, but we can use just one listener. First write a class definition for the container frame. Here is a skeleton:

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

public class TwoButtons extends   implements  
{


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

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

  }
}

Notice that this program includes main() inside the TwoButtons class.

For now, just decide what class this new one extends and what interface it will implement. Then fill in the constructor in main()

Answer:

The Frame

QUESTION 4: