public class KlasesNosaukums extends JFrame implements ActionListener
{
   protected JButton poga_1;
   protected JButton poga_2;
   ...
   protected JButton poga_n;
   public void actionPerformed(ActionEvent e)
   {
      if(e.getSource() == poga_1) {
         ...
      } else if (e.getSource() == poga_2) {
         ...
      } else if (e.getSource() == poga_3)
      ...