Here you can find the source of getNumberOfScreenDevices()
public static int getNumberOfScreenDevices()
//package com.java2s; /*//from w w w . j av a2 s .com * aTunes 1.14.0 * Copyright (C) 2006-2009 Alex Aranda, Sylvain Gaudard, Thomas Beckers and contributors * * See http://www.atunes.org/wiki/index.php?title=Contributing for information about contributors * * http://www.atunes.org * http://sourceforge.net/projects/atunes * * 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 * of the License, or (at your option) 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. */ import java.awt.GraphicsEnvironment; public class Main { /** * Returns number of screens in current machine * * @return */ public static int getNumberOfScreenDevices() { return GraphicsEnvironment.getLocalGraphicsEnvironment().getScreenDevices().length; } }