Here you can find the source of getTopJFrame(Container c)
public static JFrame getTopJFrame(Container c)
//package com.java2s; /*/*from w ww . j a v a2 s. c om*/ * Copyright (C) 2005 Alexis Miara (alexis.miara@licef.ca) * * This file is part of LomPad. * * LomPad 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 of the License, or * (at your option) any later version. * * LomPad 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 LomPad; if not, write to the Free Software * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA */ import javax.swing.*; import java.awt.*; public class Main { public static JFrame getTopJFrame(Container c) { if (c instanceof JFrame) return (JFrame) c; Container theFrame = c; do { theFrame = theFrame.getParent(); } while ((theFrame != null) && !(theFrame instanceof JFrame)); if (theFrame == null) theFrame = new JFrame(); return (JFrame) theFrame; } }