stateMask = ENABLED; mnemonic = java.awt.event.KeyEvent.VK_UNDEFINED; listenerList = new EventListenerList(); changeEvent = new ChangeEvent(this);
  public DefaultButtonModel()  {    stateMask = ENABLED;    mnemonic = java.awt.event.KeyEvent.VK_UNDEFINED;    listenerList = new EventListenerList();        changeEvent = new ChangeEvent(this);  }