close_action = operation;
closeAction = operation;
    public void setDefaultCloseOperation(int operation)    {      SecurityManager sm = System.getSecurityManager();      if (sm != null && operation == EXIT_ON_CLOSE)	sm.checkExit(0);      if (operation != EXIT_ON_CLOSE && operation != DISPOSE_ON_CLOSE	  && operation != HIDE_ON_CLOSE && operation != DO_NOTHING_ON_CLOSE)      throw new IllegalArgumentException("defaultCloseOperation must be EXIT_ON_CLOSE, HIDE_ON_CLOSE, DISPOSE_ON_CLOSE, or DO_NOTHING_ON_CLOSE");	        close_action = operation;    }