{  close_action = 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("operation = " + operation);  close_action = operation; }
    public void setDefaultCloseOperation(int operation)    {  close_action = operation;   }