Courtesy from Lachlan:

/* Lachlan McCarty
 * 11-16-14
 * 1.8.0_25
 * LM_MovingCar.java
 * Write a program, YI_MovingCar.java that animates a car 
 * so that it moves across a frame.
 */

import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.RenderingHints;
import javax.swing.JFrame;
import javax.swing.JComponent;
import javax.swing.Timer;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;

public class LM_MovingCar {

	private final int FRAME_WIDTH = 450;
	private final int FRAME_HEIGHT = 100;
	private final int DELAY = 100;
	private final LM_MovingCarComponent component = new LM_MovingCarComponent();
	private final JFrame frame = new JFrame();
	
	public LM_MovingCar() {
		frame.setSize(FRAME_WIDTH, FRAME_HEIGHT);
		frame.setTitle("Moving Car");
		frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
		
		frame.add(component);
		
		frame.setVisible(true);
		
		ActionListener listener = new LM_TimerListener();
		Timer t = new Timer(DELAY, listener);
		t.start();
	}
	
	public static void main(String[] args) {
		new LM_MovingCar();
	}
	
	private class LM_TimerListener implements ActionListener {
		public void actionPerformed(ActionEvent event) {
			component.increaseCoor(1,0);
		}
	}
	
	private class LM_MovingCarComponent extends JComponent {
		private final int MULTIPLIER = 2; //ok to change
		private int xpadding = 10; // ok to change
		private int ypadding = 10; // ok to change
		private int CAR_WIDTH = 60*MULTIPLIER; // do not change
		private int CAR_HEIGHT = 40*MULTIPLIER; // do not change
	
		public void paintComponent(Graphics g) {
			Graphics2D g2 = (Graphics2D) g;
			// turn on antialiasing so it doesn't look like crap
			RenderingHints rh = new RenderingHints(RenderingHints.KEY_ANTIALIASING,
													RenderingHints.VALUE_ANTIALIAS_ON);
			g2.setRenderingHints(rh);
			
			g2.drawRect(0*MULTIPLIER+xpadding,10*MULTIPLIER+ypadding,60*MULTIPLIER,10*MULTIPLIER);
			g2.drawOval(10*MULTIPLIER+xpadding,20*MULTIPLIER+ypadding,10*MULTIPLIER,10*MULTIPLIER);
			g2.drawOval(40*MULTIPLIER+xpadding,20*MULTIPLIER+ypadding,10*MULTIPLIER,10*MULTIPLIER);
			g2.drawPolygon(new int[]{10*MULTIPLIER+xpadding,20*MULTIPLIER+xpadding,40*MULTIPLIER+xpadding,50*MULTIPLIER+xpadding},
							new int[]{10*MULTIPLIER+ypadding,0*MULTIPLIER+ypadding,0*MULTIPLIER+ypadding,10*MULTIPLIER+ypadding}, 4);
		}
		
		public void increaseCoor(int x, int y) {
			if (xpadding+x+CAR_WIDTH <= FRAME_WIDTH) xpadding += x;
			if (ypadding+y+CAR_HEIGHT <= FRAME_HEIGHT) ypadding += y;
			repaint();
		}
	}
}