import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
public class Liikumine4 extends JPanel
     implements ActionListener, KeyListener{
   //Pange iseliikuja ja oma liigutatav ühele lehele
   int x=100; 
   int xsamm=2;
   int y=50;
   int ysamm=3;
   int omax=30;
   int omaxsamm=1;
   int omay=15;
   int omaysamm=0;
   int d=15;
   Timer t=new Timer(100, this);
   public Liikumine4(){
      t.start();
      setFocusable(true);
      addKeyListener(this);
   }
   public void paintComponent(Graphics g){
      super.paintComponent(g);
      g.fillRect(omax, omay, d, d);
      g.drawRect(x, y, d, d);
   }
   public void keyPressed(KeyEvent e){
      int kood=e.getKeyCode();
      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;
      if(xsamm>0){
        if(x+xsamm+d>getWidth()){
          xsamm=-xsamm;
        }
      } else {
        if(x+xsamm<0){
          xsamm=-xsamm;
        }
      }
      if(ysamm>0){
        if(y+ysamm+d>getHeight()){
          ysamm=-ysamm;
        }
      } else {
        if(y+ysamm<0){
          ysamm=-ysamm;
        }
      }
      y=y+ysamm;
      x=x+xsamm;
      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 Liikumine4());
     f.setSize(300, 300);
     f.setVisible(true);
   }
}