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

public class circle extends Applet implements ActionListener{
  Button nupp1=new Button("  radius  ");
  TextField pikkus1=new TextField(" 0 ");
  Button nupp2=new Button("  area  ");
  TextField pikkus2=new TextField(" 0 ",6);
  public void init(){
    add(nupp1);
    add(pikkus1);
    add(nupp2);
    add(pikkus2);
    nupp1.addActionListener(this);
    nupp2.addActionListener(this);
  }
 
  public void actionPerformed(ActionEvent e){
    int nr=Integer.parseInt(pikkus1.getText().trim());
    Graphics g=this.getGraphics();
    g.setColor(Color.white);
    g.fillRect(0, 0, getSize().width, getSize().height);
    g.setColor(Color.blue);
    g.fillOval(10, 50, nr*5, nr*5);
    pikkus2.setText(numbriks(pikkus1)*numbriks(pikkus1)*3.14+"");
  }
  int numbriks(TextField tf){
    return Integer.parseInt(tf.getText().trim());
  }
  
}