Game

import javax.swing.*;
import java.awt.*;
import java.awt.event.*;

public class prog {
    public static void main(String[] args) {
        myFrame okno = new myFrame();
    }
}

class myFrame extends JFrame
{
    private int z = 0;
    String z1 = Integer.toString(z);

    public myFrame()
    {
        setBounds(0,0,500,500);
        setVisible(true);
        Container cont = getContentPane();
        myPanel pan = new myPanel();
        cont.add(pan);

        JLabel lab = new JLabel(z1);
        lab.setSize(10, 10);
        lab.setLocation(0,0);
        cont.add(lab);
    }
}

class myPanel extends JPanel
{
    private int x = 0,y = 0, napr=0;


    private class myKey implements KeyListener
    {
        public void keyPressed(KeyEvent e)
        {
            int key_ = e.getKeyCode();
            if ((key_ == 39)&&(x != 450))x=x+5;
            if ((key_ == 37)&&(x != 0))x=x-5;
            if ((key_ == 38)&&(y != 0))y=y-5;
            if ((key_ == 40)&&(y != 450))y=y+5;
        }
        public void keyReleased(KeyEvent e){}
        public void keyTyped(KeyEvent e){}
    }

    public myPanel()
    {


        addKeyListener(new myKey());
        setFocusable(true);

        Timer time = new Timer(1, new ActionListener() {
            public void actionPerformed(ActionEvent e) {
                repaint();
            }
        });

    time.start();
    }
    public void paintComponent(Graphics gr)
    {
        super.paintComponent(gr);
        gr.setColor(Color.black);
        gr.fillRect(x, y, 50, 50);
    }
}