java - close the application buttonListener -


i writing client gui server program. gui , component buttons in class extends jframe.

what need button listener tells server message in event client hits close button on jframe gui.

i know 

  setdefaultcloseoperation(exit_on_close);

will terminate application if button pressed, can't notify server before program terminates.

use in class

 windowadapter wa = new windowadapter()     {         public void windowclosing(windowevent we)         {             /*inform server*/         }     };      addwindowlistener(wa);

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