import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
public class Liikumine3 extends JPanel
     implements ActionListener, KeyListener{
   int omax=30;
   int omaxsamm=1;
   int omay=15;
   int omaysamm=0;
   int d=15;
   Timer t=new Timer(100, this);
   public Liikumine3(){
      t.start();
      setFocusable(true);
      addKeyListener(this);
   }
   public void paintComponent(Graphics g){
      super.paintComponent(g);
      g.fillRect(omax, omay, d, d);
   }
   public void keyPressed(KeyEvent e){
      int kood=e.getKeyCode();
      System.out.println(kood);
      if(kood==KeyEvent.VK_LEFT){omaxsamm--;}
      if(kood==KeyEvent.VK_RIGHT){omaxsamm++;}
      if(kood==KeyEvent.VK_UP){omaysamm--;}
      if(kood==KeyEvent.VK_DOWN){omaysamm++;}
   }
   public void keyReleased(KeyEvent e){}
   public void keyTyped(KeyEvent e){}

   public void liigu(){
      if(omax+omaxsamm+d>getWidth()){omaxsamm=0;}
      if(omay+omaysamm+d>getHeight()){omaysamm=0;}
      if(omax+omaxsamm<0){omaxsamm=0;}
      if(omay+omaysamm<0){omaysamm=0;}
      omax+=omaxsamm;
      omay+=omaysamm;
      repaint();
   }
   public void actionPerformed(ActionEvent e){
     if(e.getSource()==t){
      liigu();
     }
   }
   
   public static void main(String[] arg){
     JFrame f=new JFrame("Liikumine");
     f.add(new Liikumine3());
     f.setSize(300, 300);
     f.setVisible(true);
   }
}