Here you can find the source of badField(JTextField field)
public static void badField(JTextField field)
//package com.java2s; /*/* w w w. j av a2 s . com*/ * Qizx/open 4.1 * * This code is part of the Qizx application components * Copyright (C) 2004-2010 Axyana Software -- All rights reserved. * * The contents of this file are subject to the Mozilla Public License * Version 1.1 (the "License"); you may not use this file except in * compliance with the License. You may obtain a copy of the License at * http://www.mozilla.org/MPL/ * * Software distributed under the License is distributed on an "AS IS" basis, * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License * for the specific language governing rights and limitations under the * License. * * The Initial Developer of the Original Code is Xavier Franc - Axyana Software. * */ import javax.swing.JTextField; public class Main { /** * Beeps to report the error, moves focus to specified field and selects * all its content. */ public static void badField(JTextField field) { field.getToolkit().beep(); field.selectAll(); field.requestFocus(); } }