import java.awt.*;
import java.applet.*;

public class Painonappi extends Applet
{
 int luku=0;
 Button tulos;

 public void init()
 {
  add ("Plus",new Button("Plus"));
  add ("Minus",new Button("Minus"));
  add ("Result",tulos = new Button("0"));
 }

 public boolean action(Event evt, Object arg)
 {
  if (evt.target instanceof Button)
  {
   if ("Plus".equals(arg))
    luku++;
   else if ("Minus".equals(arg))
    luku--;
   else
    luku=0;
  
   // Set the result as the button label
   tulos.setLabel(""+luku);
  }
  return true;
 }
}