Thread: Things Won't Move

What I want it to do is make the rectangle move across the screen. Here's my code:

package game;
 
import java.awt.*;
import javax.swing.*;
 
public class Panel extends JPanel {
 
	private int txtx, txty;
	private int rectx, recty;
	private int ovalx, ovaly;
	private boolean start, running;
 
	public Panel() {
		txtx = 50;
		txty = 50;
 
		rectx = 50;
		recty = 80;
 
		ovalx = 50;
		ovaly = 210;
 
		start = true;
 
		setBackground(Color.WHITE);
		setForeground(Color.BLACK);
		setFont(new Font("Ariel", Font.PLAIN, 20));
 
		run();
	}
 
	public void run(){
		if(start){
			running = true;
                        gameloop();
		}
	}
 
	public void paintComponent(Graphics g) {
		super.paintComponent(g);
		Graphics2D g2 = (Graphics2D) g;
 
		g2.setRenderingHint(RenderingHints.KEY_ANTIALIASING,
				RenderingHints.VALUE_ANTIALIAS_ON);
 
		g2.drawString("diz iz mah texz", txtx, txty);
		g2.setColor(Color.RED);
		g2.fillRect(rectx, recty, 100, 100);
		g2.setColor(Color.BLUE);
		g2.fillOval(ovalx, ovaly, 100, 100);
	}
 
	public void gameloop() {
		while (running) {
			rectx++;
			repaint();
 
			try {
				Thread.sleep(20);
			} catch (Exception e) {
 
			}
		}
	}
 
}
 
package game;
 
import javax.swing.*;
 
public class Game {
 
	public static void main(String[] args) {
		new Game();
	}
 
	public Game() {
		JFrame f = new JFrame("My Graphics");
		Panel p = new Panel();
 
		f.setSize(800, 600);
		f.setLocationRelativeTo(null);
		f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
		f.add(p);
		f.setVisible(true);
	}
 
}