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
{


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

class myPanel extends JPanel
{
        private int x = 0,y = 0, napr=0, u = x + 25, i = y+25, j = 0;


        private class myKey implements KeyListener
        {
                public void keyPressed(KeyEvent e)
                {
                        int key_ = e.getKeyCode();
                        if ((key_ == 39)&&(x != 450))
                            {
                                x=x+5;
                                napr = 0;
                            }
                        if ((key_ == 37)&&(x != 0))
                            {
                                x=x-5;
                                napr = 1;
                            }
                         if ((key_ == 38)&&(y != 0))
                            {
                                y=y-5;
                                napr = 2;
                            }
                        if ((key_ == 40)&&(y != 450))
                            {
                                y=y+5;
                                napr = 3;
                            }
                        if (key_ == 10)
                        {
                            j = 1;
                        }
                }
                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) {
                            if (j == 1)
                            {
                                if (napr == 0)
                                {
                                    u = u +10;
                                }
                            }
                            else
                            {
                                u = x+25;
                                i = y+25;
                            }
                            if (u >= 500)j = 0;
                            repaint();
                        }
                });

        time.start();
        }
        public void paintComponent(Graphics gr)
        {
                super.paintComponent(gr);
                gr.setColor(Color.black);
                gr.fillRect(x, y, 50, 50);
                gr.fillRect(u, i, 1, 1);
        }
}