Using applet to demonstrate the wind

 import java.applet.Applet;  
 import java.awt.Dimension;  
 import java.awt.Graphics;  
 public class Wind extends Applet implements Runnable{  
   int Theta;  
   int x11=0,y11=0,x12=0,y12=0,x21=0,y21=0,x22=0,y22=0;  
   @Override  
   public void run() {  
     while(true){  
       Dimension d=getSize();  
       x11=150+(int)(100*Math.cos(Math.toRadians(Theta)));  
       y11=150+(int)(100*Math.sin(Math.toRadians(Theta)));  
       x12=150+(int)(100*Math.cos(Math.toRadians(Theta+180)));  
       y12=150+(int)(100*Math.sin(Math.toRadians(Theta+180)));  
       x21=150+(int)(100*Math.cos(Math.toRadians(Theta+90)));  
       y21=150+(int)(100*Math.sin(Math.toRadians(Theta+90)));  
       x22=150+(int)(100*Math.cos(Math.toRadians(Theta+270)));  
       y22=150+(int)(100*Math.sin(Math.toRadians(Theta+270)));  
       Theta++;  
       try{  
         Thread.sleep(3);  
         repaint();  
       }  
       catch(Exception e){  
       }  
     }  
   }  
   @Override  
   public void init(){  
     Thread t1=new Thread(this);  
     t1.start();  
   }  
   @Override  
   public void paint(Graphics g){  
     g.drawLine(x11,y11,x12,y12);  
     g.drawLine(x21,y21,x22,y22);  
   }  
 }  

OUTPUT