Moviendo una Imagen .GIF usando teclado

Programa donde utilizamos las flechas para mover la imagen (KeyEvent) 

import java.applet.Applet;

import java.applet.AudioClip;

import java.awt.*;

import java.awt.event.KeyAdapter;

import java.awt.event.KeyEvent;

import java.net.URL;

import javax.swing.*;

public class caminando extends JFrame {

Image im1;

int codigo, x=101, y=121;

String dato = "";

int salto=5;

public caminando(){

setSize(500,500);

setTitle("Coche en Movimiento");

setVisible(true);

im1=(Toolkit.getDefaultToolkit().getImage("Viejo.gif"));

addKeyListener(new KeyAdapter(){

public void keyPressed(KeyEvent var){

ProgramacionTeclas(var);

}});

}

public void paint(Graphics a){

//fondo

a.setColor(Color.BLACK);

a.fillRect(0, 0, 500, 500);

//carretera

a.setColor(Color.white);

a.drawLine(100,120,450,120);

a.setColor(Color.magenta);

a.drawLine(100,160,410,160);

a.setColor(Color.cyan);

a.drawLine(410,160,410,380);

a.setColor(Color.blue);

a.drawLine(450,120,450,420);

a.setColor(Color.green);

a.drawLine(410,380,90,380);

a.setColor(Color.orange);

a.drawLine(450,420,90,420);

//meta

a.setFont(new Font("Arial",Font.BOLD,20));

a.setColor(Color.RED);

a.drawString("Meta", 35, 405);

//Inicio

a.setFont(new Font("Arial",Font.BOLD,20));

a.setColor(Color.red);

a.drawString("Inicio", 35, 145);

//coche

a.drawImage(im1,x,y,35,35,this);

}

public void ProgramacionTeclas(KeyEvent  z){

codigo=z.getKeyCode();

dato=KeyEvent.getKeyText(codigo);

mueve(dato);

}

public void mueve(String t ){

if(t.equalsIgnoreCase("Derecha")){

if(x<410&&x>90&&y==121){

x=x+salto;

repaint();

}

if(x<410&&x>30&&y==381){

x=x+salto;

repaint();

}

}

if(t.equalsIgnoreCase("Abajo")){

if(x>410&&y<380){

y=y+salto;

repaint();

}

}

if(t.equalsIgnoreCase("Arriba")){

if(x>410&&y>121){

y=y-salto;

repaint();

}

}

if(t.equalsIgnoreCase("Izquierda")){

if(x<412&&x>100&&y==121){

x=x-salto;

repaint();

}

if(x<412&&x>40&&y==381){

x=x-salto;

repaint();

}

}

}

public static void main (String  args[]){

caminando termo=new caminando();

termo.setLocation(200,50);

termo.setVisible(true);

}

}