Java tutorial
//package com.java2s; /* * 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. */ import java.util.HashMap; import java.util.Map; public class Main { /** Indicates whether collection elements should be actually checked. */ private static final boolean DEBUG = false; @SuppressWarnings("unchecked") public static <K, V> Map<K, V> checkMap(Map<?, ?> map, Class<K> keyType, Class<V> valueType) { if (DEBUG) { Map<K, V> copy = new HashMap<K, V>(); for (Map.Entry<?, ?> entry : map.entrySet()) { copy.put(keyType.cast(entry.getKey()), valueType.cast(entry.getValue())); } return copy; } return (Map<K, V>) map; } }