Java tutorial
//package com.java2s; /* * Copyright (c) 2005-2016 Vincent Vandenschrick. All rights reserved. * * This file is part of the Jspresso framework. * * Jspresso is free software: you can redistribute it and/or modify * it under the terms of the GNU Lesser General Public License as published by * the Free Software Foundation, either version 3 of the License, or * (at your option) any later version. * * Jspresso 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 Lesser General Public License for more details. * * You should have received a copy of the GNU Lesser General Public License * along with Jspresso. If not, see <http://www.gnu.org/licenses/>. */ import java.awt.Container; import java.awt.Dimension; import java.awt.Window; public class Main { /** * Center a window on screen. * * @param w * the window to center on screen. */ public static void centerInParent(Window w) { Container parent = w.getParent(); if (parent != null) { Dimension parentSize = parent.getSize(); w.setLocation(parent.getX() + (parentSize.width - w.getWidth()) / 2, parent.getY() + (parentSize.height - w.getHeight()) / 2); } } }