import java.awt.*;
import java.applet.Applet;

public class Joonis extends Applet{
public void paint(Graphics g){

g.setColor(Color.black);
g.drawLine(0,50,150,200);
g.drawLine(150,200,400,200);

int y=25;
for(int x=25;x<400;x=x+2){


if(x<150){y=x+25;}else{y=175;}
g.setColor(Color.black);
g.drawRect(x,y,20,20);
try{Thread.sleep(50);}catch(Exception e){}
g.setColor(Color.white);
g.drawRect(x,y,20,20);


}
}
public static void main(String argumendid[]){
Frame f=new Frame("Kaldpind");
f.setSize(400,400);
f.add(new Joonis());
f.setVisible(true);
}
}