import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;

/**
   An action listener that prints a message.
*/
public class ButtonListener implements ActionListener
{
   public void actionPerformed(ActionEvent event)
   {
      System.out.println("You clicked me!!!!");
   }            
}

import java.awt.event.ActionListener;
import javax.swing.JButton;
import javax.swing.JFrame;

/**
   This program demonstrates how to install an action listener.
*/
public class ButtonViewer
{  
   private static final int FRAME_WIDTH = 100;
   private static final int FRAME_HEIGHT = 60;

   public static void main(String[] args)
   {  
      JFrame frame = new JFrame();
      JButton button = new JButton("Click here if you dare!");
      frame.add(button);
     
      ActionListener listener = new ButtonListener();
      button.addActionListener(listener);

      frame.setSize(FRAME_WIDTH, FRAME_HEIGHT);
      frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
      frame.setVisible(true);
   }
}

import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.geom.Ellipse2D;
import javax.swing.JComponent;

/**
   This component displays a circle that can be moved. 
*/
public class ShapeComponent extends JComponent
{  
   private static final int SQUARE_X = 100;
   private static final int SQUARE_Y = 100;
   private static final int SQUARE_WIDTH = 50;
   private static final int SQUARE_HEIGHT = 50;

   private Ellipse2D.Double circle;

   public ShapeComponent()
   {  
      // The rectangle that the paintComponent method draws
      circle = new Ellipse2D.Double(SQUARE_X, SQUARE_Y, SQUARE_WIDTH, SQUARE_HEIGHT);         
   }

   public void paintComponent(Graphics g)
   {  
      Graphics2D g2 = (Graphics2D) g;

      g2.draw(circle);
   }

   /**
      Moves the rectangle to the given location.
      @param x the x-position of the new location
      @param y the y-position of the new location
   */
   public void moveTo(int x, int y)
   {
      circle = new Ellipse2D.Double(x, y, SQUARE_WIDTH, SQUARE_HEIGHT);
      repaint();      
   }
} 

import java.awt.event.MouseListener;
import java.awt.event.MouseEvent;
import javax.swing.JFrame;
import java.awt.Color;

/**
   This program displays a ShapeComponent.
*/
public class ShapeComponentViewer
{  
   private static final int FRAME_WIDTH = 300;
   private static final int FRAME_HEIGHT = 400;

   public static void main(String[] args)
   {        
      final ShapeComponent component = new ShapeComponent();

      // Add mouse press listener         

      class MousePressListener implements MouseListener
      {  
         public void mousePressed(MouseEvent event)
         {  
            int x = event.getX();
            int y = event.getY();
            component.moveTo(x, y);
         }

         // Do-nothing methods
         public void mouseReleased(MouseEvent event) {}
         public void mouseClicked(MouseEvent event) {}
         public void mouseEntered(MouseEvent event) {}
         public void mouseExited(MouseEvent event) {}
      }
         
      MouseListener listener = new MousePressListener();
      component.addMouseListener(listener);

      JFrame frame = new JFrame();
      frame.getContentPane().setBackground(new Color(255, 0, 0));
      frame.add(component);

      frame.setSize(FRAME_WIDTH, FRAME_HEIGHT);
      frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
      frame.setVisible(true);
   }
} 

Classwork:
Use the resources given to create a new GUI application, YI_CrazyCircle.py and its JFrame to generate random colors background and random filled circles whenever you click the mouse on the window.
Hint: To be able to also change the background at random create a rectangle of size equivalent to the JFrame. Instead of creating two public classes, create one inner class, the JComponnet inside main so it can have access to the JFrame size.