Here you can find the source of beep()
public static void beep()
//package com.java2s; /*//from w w w . ja v a2s .co m * 05/25/2001 - 22:06:52 * * Utilities.java - Some utilities for Jext and its classes * Copyright (C) 1999-2000 Romain Guy * romain.guy@jext.org * www.jext.org * * 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 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 - Suite 330, Boston, MA 02111-1307, USA. */ public class Main { /** * Used to 'beep' the user. */ public static void beep() { Toolkit.getDefaultToolkit().beep(); } }