Java tutorial
//package com.java2s; /* =========================================================== * TradeManager : An application to trade strategies for the Java(tm) platform * =========================================================== * * (C) Copyright 2011-2011, by Simon Allen and Contributors. * * Project Info: org.trade * * This library 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 library 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 library; if not, write to the Free Software * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, * USA. * * [Java is a trademark or registered trademark of Oracle, Inc. * in the United States and other countries.] * * (C) Copyright 2011-2011, by Simon Allen and Contributors. * * Original Author: Simon Allen; * Contributor(s): -; * * Changes * ------- * */ import java.util.Dictionary; import java.util.Enumeration; public class Main { /** * Return a Dictionary object which is a subset of the given Dictionary, * where the tags all <b>begin</b> with the given tag. * * Hastables and Properties can be used as they are Dictionaries. * * @param superset * . * * * @param tag * String * @param result * Dictionary<String,Object> */ public static void getSubset(Dictionary<String, Object> superset, String tag, Dictionary<String, Object> result) { if ((result == null) || (tag == null) || (superset == null)) { throw new IllegalArgumentException("Invalid arguments specified : superset = " + superset + " tag = " + tag + " result = " + result); } String key; Enumeration<String> enumKey = superset.keys(); while (enumKey.hasMoreElements()) { key = enumKey.nextElement(); if (key.startsWith(tag)) { result.put(key, superset.get(key)); } } } }