java - How to check if JDialog's has no parent? -


jdialog created parent set null. so:

final jpanel dialogpanel = new jpanel(); joptionpane optionpane = new joptionpane(         "a modal swing jdialog parent null.",         joptionpane.information_message); final jdialog dialog = optionpane.createdialog(null, "jdialog parent null.");

in class implements awteventlistener there handleopenedwindow method:

private void handleopenedwindow(windowevent event) {         final window window = event.getwindow();         if (window instanceof dialog) {              if (window.getparent() == null                     || window.getparent().getclass().getname()                             .contains("sharedownerframe")) {                 updatewindowlocation(window);             }         }     }

as alternative tried use window.getowner().getclass().isassignablefrom(javax.swing.swingutilities.class) not working.

what more elegant way check if jdialog has no parent?

update

swingutilities.windowforcomponent(window) evaluates @ runtime as:

javax.swing.swingutilities$sharedownerframe[frame0,0,0,132x38,invalid,hidden,layout=java.awt.borderlayout,title=,resizable,normal]


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