Review

class APDUSenderPanel {
   public void actionPerformed(ActionEvent ae) {
      JButton button = (JButton) ae.getSource();

      if (button == copyButton) {
         eApduField.setAPDU(bApduField.getAPDU());
      } else if (button == sendButton) {
         (new Thread(this)).start();
      }
   }

}