Here you can find the source of throwIfNotOnEDT()
static void throwIfNotOnEDT()
//package com.java2s; /******************************************************************************* * Copyright (c) 2014 Open Door Logistics (www.opendoorlogistics.com) * All rights reserved. This program and the accompanying materials * are made available under the terms of the GNU Lesser Public License v3 * which accompanies this distribution, and is available at http://www.gnu.org/licenses/lgpl.txt ******************************************************************************/ import javax.swing.SwingUtilities; public class Main { static void throwIfNotOnEDT() { // must be on EDT if (!SwingUtilities.isEventDispatchThread()) { throw new RuntimeException(); }//from w w w . j ava2 s .c o m } }