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

public class StopLight extends JApplet implements MouseListener
{
	// instance variables - replace the example below with your own
	private int flag;

	public void init()
	{
	
		JRootPane rootPane = this.getRootPane();	
		rootPane.putClientProperty("defeatSystemEventQueueCheck", Boolean.TRUE);
	    flag = 0;
	    addMouseListener(this);
		
	}

	

	/**
	 * Paint method for applet.
	 * 
	 * @param  g   the Graphics object for this applet
	 */
	public void paint(Graphics g)
	{
	    Graphics2D g2 = (Graphics2D)g;
		// simple text displayed on applet
		g2.setColor(Color.black);
		g2.fillRect(0, 0, 400, 800);
		g2.setColor(Color.red);
		g2.drawOval(100, 5, 200, 200);
		g2.setColor(Color.yellow);
		g2.drawOval(100, 215, 200, 200);
		g2.setColor(Color.green);
		g2.drawOval(100, 425, 200, 200);
		System.out.println(flag);
		if(flag%3 == 0)
		{
		    g2.setColor(Color.red);
		    g2.fillOval(100, 5, 200, 200);
		}
		else if(flag%3 == 1)
		{
		   g2.setColor(Color.green);
		    g2.fillOval(100, 425, 200, 200);   
		    flag++;
		    try{
		        Thread.sleep(1000);
		      }catch(Throwable t){}
		    repaint();
		
		   
		  }
		  else 
		 {
		    g2.setColor(Color.yellow);
		    g2.fillOval(100, 215, 200, 200);
		    flag++;
		    try{
		          Thread.sleep(1000);
		    }catch(Throwable t){}
		    repaint();
		
		  }
		    
		
	}
       public void mouseClicked(MouseEvent e) 
       {
           flag = ++flag %3;
           repaint();
         }
          
       public void mouseEntered(MouseEvent e) {}
         
       public void mouseExited(MouseEvent e) {}
         
       public void mousePressed(MouseEvent e) {}
      
      public  void mouseReleased(MouseEvent e){} 
 

	
}