Java tutorial
import java.io.File; import java.io.IOException; import java.io.UnsupportedEncodingException; import java.net.MalformedURLException; import java.net.URI; import java.net.URISyntaxException; import java.net.URL; import java.net.URLDecoder; import java.util.Map; /* * JBoss, Home of Professional Open Source * Copyright 2005, JBoss Inc., and individual contributors as indicated * by the @authors tag. See the copyright.txt in the distribution for a * full listing of individual contributors. * * This 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 2.1 of * the License, or (at your option) any later version. * * This software 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 this software; if not, write to the Free * Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA * 02110-1301 USA, or see the FSF site: http://www.fsf.org. */ public class Main { /** * Check whether the given String is a valid identifier according * to the Java Language specifications. * * See The Java Language Specification Second Edition, Section 3.8 * for the definition of what is a valid identifier. * * @param s String to check * * @return <code>true</code> if the given String is a valid Java * identifier, <code>false</code> otherwise. */ public final static boolean isValidJavaIdentifier(String s) { // an empty or null string cannot be a valid identifier if (s == null || s.length() == 0) { return false; } char[] c = s.toCharArray(); if (!Character.isJavaIdentifierStart(c[0])) { return false; } for (int i = 1; i < c.length; i++) { if (!Character.isJavaIdentifierPart(c[i])) { return false; } } return true; } }