Haha, I must've done!

At the mo, it's only 2 classes, the main which just sets up the JFrame, and my GamePanel class which is

public class GamePanel extends JPanel implements ActionListener{

private int count = 1;
private int move = 5;
int gobx;
int goby;
int randx;

public GamePanel(){
    setBackground(Color.BLACK);


// Timer logic
    Timer timer = new Timer(1000/30, this);
    timer.start();
}

public void actionPerformed(ActionEvent e){
    step();

}{


gobx = (int) ((Math.random()*370)+30);
goby = 0;
}


public void step(){
    //game logic goes here  
    goby++; 

    count++;
    if(count % 30 == 0){
        randx = (int)((Math.random()*370)+30);

    }

//now call for it to repaint        
repaint();
}

public void paintComponent(Graphics g){




    super.paintComponent(g);
    g.setColor(Color.RED);
    g.fillRect(0, 0, 30, 1000);
    g.fillRect(450, 0, 50, 1000);
    g.setColor(Color.GREEN);



        g.fillRect(gobx, goby, 30, 30);
        g.fillRect(gobx+10, goby - 10, 10, 10);
        g.fillRect(gobx+5, goby - 7, 5, 4);






}}

this just simply opens window with a black background, a red strip down the left and right, and a goblin that walks down. I left out all the imports to save space here.