java - How to create JFrame in the same thread so that it blocks? -


for debug purposes, need draw image on screen in simple window.

swing handles it's events in separate message loop thread. means if following:

   while(true) {      //get screenshot      bufferedimage screenshot = mswindow.screenshot();      //create jframe      jframe frame = new jframe();      container main = frame.getcontentpane();      //this layout should force jlabel large window, right?      main.setlayout(new gridlayout(1,1));      //create jlabel display screenshot      jlabel label = new jlabel(new imageicon(screenshot));      main.add(label);      frame.pack();      frame.setvisible(true);      //delay allways when meddling dangerous things      thread.sleep(2000);    }

... end many many jframes.

image description

i used use jdialog blocking , stops thread until press ok:

joptionpane.showmessagedialog(null, scrollpane, message, javax.swing.joptionpane.information_message);

this has flaw though - can't see debug window on taskbar. sometimes, it's hard find window ended up. why want switch jframe.

my question straight this: how make current thread wait until jframe closed?

how create jframe in same thread blocks?

use modal jdialog.

joptionpane.showmessagedialog(null, scrollpane, message, javax.swing.joptionpane.information_message);

this has flaw though - can't see debug window on taskbar.

don't use null dialog owner. make sure specify owner jframe. whenever click on taskbar icon frame , child dialog both show up.


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