BG

import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.Image;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.KeyAdapter;
import java.awt.event.KeyEvent;


import javax.swing.ImageIcon;
import javax.swing.JPanel;
import javax.swing.Timer;


public class GUI extends JPanel implements ActionListener {

    Timer time;
    Image img;
    int key;
    int X_Bild;
    int lauf;



public GUI() {

    key = 0;
    lauf = 0;

    setFocusable(true);
    ImageIcon u = new ImageIcon("C:/Users/Birne/Documents/Java/Bilder/BG_1.jpg");
    img = u.getImage();
    addKeyListener(new AL());

    time = new Timer (5, this);
    time.start();

}

public void actionPerformed (ActionEvent e) {
    bewegen();
    repaint();
}


public void paint (Graphics g){

    super.paint(g);
    Graphics2D f2 = (Graphics2D) g;

    f2.drawImage(img,X_Bild,0,null);

}


    public void bewegen() {

        X_Bild += lauf;

    }


    private class AL extends KeyAdapter{

        public AL() {


        }

        public void keyPressed(KeyEvent e) {


            key = e.getKeyCode();

            if(key == KeyEvent.VK_LEFT) {
                lauf = 1;
            }

            if (key == KeyEvent.VK_RIGHT) {
                lauf = -1;
            }

        }


        public void keyRelease(KeyEvent e) {

            key = e.getKeyCode();

            if (key == KeyEvent.VK_LEFT || key == KeyEvent.VK_RIGHT) {
                lauf = 0;
            }
        }


    }


}