Here you can find the source of showCenteredDialog(final JDialog dialog)
public static final void showCenteredDialog(final JDialog dialog)
//package com.java2s; /*/* w w w.j a va 2 s . c o m*/ Wenity v1.5 - a Zenity clone written in Java Copyright (c) 2012, 2013 Karoly Kalman http://kksw.zzl.org/ This file is part of Wenity v1.5. Wenity v1.5 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 3 of the License, or (at your option) any later version. Wenity v1.5 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 Wenity v1.5. If not, see <http://www.gnu.org/licenses/>. */ import javax.swing.*; public class Main { public static final void showCenteredDialog(final JDialog dialog) { dialog.setLocationRelativeTo(null); dialog.setVisible(true); } }