How can I solve this graphic problem.

[peterx peter]

Hi!
I try to draw a car.The car is build of two rectangles (car and cars roof)By help of this program my car must move (to right direction).My program is not working because when the both rectangles move in the same time.First moves the Car rectangle and then moves the roof rectangle.
Both rectangles do not move in the same time.How can I solve this problem.

public void paint(Graphics g)
  {
    for(int i=1; i<=1000; i++) 
 {
    // Car 
    g.setColor(Color.red);
    g.drawRect(45+i, 243, 20, 13);
    g.fillRect(45+i, 243, 20, 13);
    Input.delay(150);
    
    g.setColor(Color.black);
    g.clearRect(45+i, 243, 20, 14);
    g.fillRect (45+i, 243, 20, 14);
    
    //Cars roof
     g.setColor(Color.red);
    g.drawRect(49+i, 235, 10, 15);
    g.fillRect(49+i, 235, 10, 15);
    
    Input.delay(150);
    g.setColor(Color.black);
    g.clearRect(49+i, 235, 10, 16);
    g.fillRect (49+i, 235, 10, 16);
}
}