Java tutorial
//package com.java2s; /** * Copyright (C) 2012-2015 52North Initiative for Geospatial Open Source * Software GmbH * * This program is free software; you can redistribute it and/or modify it * under the terms of the GNU General Public License version 2 as published * by the Free Software Foundation. * * If the program is linked with libraries which are licensed under one of * the following licenses, the combination of the program with the linked * library is not considered a "derivative work" of the program: * * - Apache License, version 2.0 * - Apache Software License, version 1.0 * - GNU Lesser General Public License, version 3 * - Mozilla Public License, versions 1.0, 1.1 and 2.0 * - Common Development and Distribution License (CDDL), version 1.0 * * Therefore the distribution of the program linked with libraries licensed * under the aforementioned licenses, is permitted by the copyright holders * if the distribution is compliant with both the GNU General Public * License version 2 and the aforementioned licenses. * * 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. */ import java.util.Collections; import java.util.HashMap; import java.util.Map; import com.google.common.collect.Maps; public class Main { public static <K, V> Map<K, V> synchronizedMap() { return Collections.synchronizedMap(Maps.<K, V>newHashMap()); } public static <K, V> Map<K, V> synchronizedMap(int initialCapacity) { return Collections.synchronizedMap(new HashMap<K, V>(initialCapacity)); } public static <K, V> Map<K, V> synchronizedMap(int initialCapacity, float loadFactor) { return Collections.synchronizedMap(new HashMap<K, V>(initialCapacity, loadFactor)); } }