import java.awt.*;
import java.awt.geom.*;
import java.util.*;

/**
   A car that can be moved around.
*/
public class CarShape implements MoveableShape
{
   /**
      Constructs a car item.
      @param x the left of the bounding rectangle
      @param y the top of the bounding rectangle
      @param width the width of the bounding rectangle
   */
   public CarShape(int x, int y, int width)
   {
      this.x = x;
      this.y = y;
      this.width = width;
   }

   public void translate(double dx, double dy)
   {
      x += dx;
      y += dy;
   }

   public void draw(Graphics2D g2)
   {
      Rectangle2D.Double body
         = new Rectangle2D.Double(x, y + width / 6, 
            width - 1, width / 6);
      Ellipse2D.Double frontTire
         = new Ellipse2D.Double(x + width / 6, y + width / 3, 
            width / 6, width / 6);
      Ellipse2D.Double rearTire
         = new Ellipse2D.Double(x + width * 2 / 3, y + width / 3,
            width / 6, width / 6);

      // the bottom of the front windshield
      Point2D.Double r1
         = new Point2D.Double(x + width / 6, y + width / 6);
      // the front of the roof
      Point2D.Double r2
         = new Point2D.Double(x + width / 3, y);
      // the rear of the roof
      Point2D.Double r3
         = new Point2D.Double(x + width * 2 / 3, y);
      // the bottom of the rear windshield
      Point2D.Double r4
         = new Point2D.Double(x + width * 5 / 6, y + width / 6);
      Line2D.Double frontWindshield
         = new Line2D.Double(r1, r2);
      Line2D.Double roofTop
         = new Line2D.Double(r2, r3);
      Line2D.Double rearWindshield
         = new Line2D.Double(r3, r4);
      
      g2.draw(body);
      g2.draw(frontTire);
      g2.draw(rearTire);
      g2.draw(frontWindshield);
      g2.draw(roofTop);
      g2.draw(rearWindshield);
   }
   
   private int x;
   private int y;
   private int width;
}

MoveableShape.java

import java.awt.*;

/**
   A shape that can be moved around.
*/
public interface MoveableShape
{
   /**
      Draws the shape.
      @param g2 the graphics context
   */
   void draw(Graphics2D g2);
   /**
      Moves the shape by a given amount.
      @param dx the amount to translate in x-direction
      @param dy the amount to translate in y-direction
   */
   void translate(double dx, double dy);
}

ShapeIcon.java

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

/**
   An icon that contains a moveable shape.
*/
public class ShapeIcon implements Icon
{
   public ShapeIcon(MoveableShape shape,
      int width, int height)
   {
      this.shape = shape;
      this.width = width;
      this.height = height;
   }
   
   public int getIconWidth()
   {
      return width;
   }

   public int getIconHeight()
   {
      return height;
   }

   public void paintIcon(Component c, Graphics g, int x, int y)
   {
      Graphics2D g2 = (Graphics2D) g;
      shape.draw(g2);
   }

   private int width;
   private int height;
   private MoveableShape shape;
}

AnimationTest.java

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

/**
   This program implements an animation that moves
   a car shape. 
*/
public class AnimationTest
{
   public static void main(String[] args)
   {
      JFrame frame = new JFrame();

      final MoveableShape shape 
         = new CarShape(0, 0, CAR_WIDTH);
      
      ShapeIcon icon = new ShapeIcon(shape,
         ICON_WIDTH, ICON_HEIGHT);

      final JLabel label = new JLabel(icon);
      Container contentPane = frame.getContentPane();
      contentPane.setLayout(new FlowLayout());
      contentPane.add(label);

      frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
      frame.pack();
      frame.setVisible(true);

      final int DELAY = 100; 
      // milliseconds between timer ticks
      Timer t = new Timer(DELAY, new
         ActionListener()
         {
            public void actionPerformed(ActionEvent event)
            {
               shape.translate(1, 0);
               label.repaint();
            }
         });
      t.start();
   }

   private static final int ICON_WIDTH = 400;
   private static final int ICON_HEIGHT = 100;
   private static final int CAR_WIDTH = 100;
}

Results

The car moves from left to right and slowly travels out-of-sight.