Java - programa muy basico que me dibuje algo en la pantalla y que pueda mover el dibujo

import javax.swing.JFrame;

import java.awt.Color;

import java.awt.Graphics;

import java.awt.Dimension;

import java.awt.event.KeyEvent;

import java.awt.event.KeyListener;

import java.awt.event.KeyAdapter;

import java.lang.reflect.InvocationTargetException;

import javax.swing.SwingUtilities;

class Graficos extends JFrame implements Runnable{

	private JFrame vent;

	public void paint(Graphics g){

		super.paint(g);

		int posX=300;

		int posY=300;

		Personaje.dibuja(g,posX,posY);

	}

	public static void main (String [] args)throws InterruptedException, InvocationTargetException{

		SwingUtilities.invokeAndWait(new Graficos());

	}

	@Override

	public void run(){

		vent = new JFrame("Graficos");

		vent.setBounds(0,0,600,600);

		vent.setFocusable(true);

		vent.setVisible(true);

		vent.setResizable(false);

		vent.setLocationRelativeTo(null);

		vent.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

		vent.addKeyListener(new KeyListener() {

			@Override

			public void keyTyped(KeyEvent e) { }

			@Override

			public void keyPressed(KeyEvent e) {

				System.out.println("Key Character: " + e.getKeyChar() + "; Key Code: " + KeyEvent.getKeyText(e.getKeyCode()));

			}

			@Override

			public void keyReleased(KeyEvent e) { }

		});

	}

}

import java.awt.Color;

import java.awt.Graphics;

class Personaje{

	public static void dibuja(Graphics g,int posX,int posY){

		g.setColor(new Color(127,127,127));

		g.fillRect(posX,posY,20,20);

		g.fillRect(posX+4,posY+20,4,10);

		g.fillRect(posX+12,posY+20,4,10);

	}

}