import java.applet.Applet;
import java.awt.*;
import java.awt.event.*;

public class ise extends Applet implements ActionListener{
  int nr=100;
  int mitu=0;
  int x=0;
  TextField tf=new TextField("30");
  Button bt= new Button("paremale");
  Button bt1= new Button("vasakule");
  Button bt2= new Button("üles");
  Button bt3= new Button("alla");
  public ise(){
    add(tf);
    tf.addActionListener(this);
	 add(bt);
    bt.addActionListener(this);
    add(bt1);
    bt1.addActionListener(this);
    add(bt2);
    bt2.addActionListener(this);
    add(bt3);
    bt3.addActionListener(this);
   }

  
  public void actionPerformed(ActionEvent ev){
  	x=0;
  	int a=450;
  	int b=250;
    nr=Integer.parseInt(tf.getText().trim());
    mitu=1;
    Graphics g=this.getGraphics();
    
   	if(ev.getSource()==bt){ 						//ring liigub paremale
    	for(int x=40; x<130; x=x+2){
    		g.setColor(Color.blue);   
      		g.drawOval(a, b, nr, nr);
			try{Thread.sleep(50);}catch(Exception e){}
      		g.setColor(Color.white);     
      		g.drawOval(a, b, nr, nr);
      		a=a+10;
      		//b=b+10;
      		//x=x+1;
    	}		
     }
     
      	if(ev.getSource()==bt1){ 						//ring liigub vasakule
    	for(int x=40; x<130; x=x+2){
    		g.setColor(Color.blue);   
      		g.drawOval(a, b, nr, nr);
			try{Thread.sleep(50);}catch(Exception e){}
      		g.setColor(Color.white);     
      		g.drawOval(a, b, nr, nr);
      		a=a-10;
      		//b=b+10;
      		//x=x+1;
    	}		
     }
      	
     if(ev.getSource()==bt3){						//ring liigub alla
    	for(int x=40; x<115; x=x+2){
      		g.setColor(Color.blue);     
      		g.drawOval(a, b, nr, nr);
      		try{Thread.sleep(50);}catch(Exception e){}
      		g.setColor(Color.white);   
      		g.drawOval(a, b, nr, nr);    
      		//a=a+10;
      		b=b+10;
	      }
     }
     
     if(ev.getSource()==bt2){						//ring liigub üles
    	for(int x=40; x<90; x=x+2){
      		g.setColor(Color.blue);     
      		g.drawOval(a, b, nr, nr);
      		try{Thread.sleep(50);}catch(Exception e){}
      		g.setColor(Color.white);   
      		g.drawOval(a, b, nr, nr);    
      		//a=a+10;
      		b=b-10;
	      }
     }
     
 	repaint();
      
  }
  public void paint(Graphics g){
	int a=450;
 	int b=250;
 	while(x<mitu){ 
 	g.setColor(Color.blue); 
    g.drawOval(a, b, nr, nr);
	x=x+1; 
 	}
  }
  public static void main(String argumendid[]){
    Frame f=new Frame("ise");
    f.setSize(1025, 730);
    f.add(new ise());
    f.setVisible(true);
  }    

}