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import javax.swing.*;

import java.awt.*;

import java.awt.event.*;

public class GUI {

public static void main(String[] args) {

GameFrame myFrame=new GameFrame();

myFrame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

myFrame.setVisible(true);

}

}

class GameFrame extends JFrame{

public static final int WIDTH=500;

public static final int HEIGHT=300;

public GameFrame(){

setSize(WIDTH,HEIGHT);

setResizable(false);

Container contentPane=getContentPane();

GamePanel myPanel=new GamePanel();

contentPane.add(myPanel);

}

}

class GamePanel extends JPanel{

int x=50,y=50;

public static final int XSPEED=5;

public static final int YSPEED=5;

public GamePanel(){

addKeyListener(new KeyMonitor());

}

public void paintComponent(Graphics g){

super.paintComponent(g);

Color c=g.getColor();

g.setColor(Color.RED);

g.fillOval(x,y,20,20);

g.setColor(c);

}

public class KeyMonitor extends KeyAdapter{

public void keyPressed(KeyEvent e){

int key=e.getKeyCode();

switch(key){

case KeyEvent.VK_LEFT:

x-=XSPEED;

break;

case KeyEvent.VK_RIGHT:

x+=XSPEED;

break;

case KeyEvent.VK_UP:

y-=YSPEED;

break;

case KeyEvent.VK_DOWN:

y+=YSPEED;

break;

}

repaint();

}

public void keyReleased(KeyEvent e){

}

}

}