Here you can find the source of isEDT()
public static void isEDT()
//package com.java2s; /**/* ww w.java2 s. co m*/ * @(#)GUIUtil.java 1.0 26.09.06 (dd.mm.yy) * * Copyright (2003) Bro3 * * This program is free software; you can redistribute it and/or modify it under * the terms of the GNU General Public License as published by the Free Software * Foundation; either version 2, or any later version. * * This program is distributed in the hope that it will be useful, but WITHOUT * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS * FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. * * You should have received a copy of the GNU General Public License along with * this program; if not, write to the Free Software Foundation, Inc., 59 Temple * Place, Boston, MA 02111. * * Contact: bro3@users.sourceforge.net **/ import javax.swing.SwingUtilities; public class Main { public static void isEDT() { if (!SwingUtilities.isEventDispatchThread()) { throw new Error("assertion failed: not on EDT"); } } }