Java tutorial
//package com.java2s; /* * Copyright 2004-2014 the Seasar Foundation and the Others. * * Licensed under the Apache License, Version 2.0 (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.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, * either express or implied. See the License for the specific language * governing permissions and limitations under the License. */ import java.util.Map; import java.util.concurrent.ConcurrentHashMap; public class Main { public static <KEY, VALUE> ConcurrentHashMap<KEY, VALUE> newConcurrentHashMap() { return new ConcurrentHashMap<KEY, VALUE>(); } public static <KEY, VALUE> ConcurrentHashMap<KEY, VALUE> newConcurrentHashMap(Map<KEY, VALUE> map) { return new ConcurrentHashMap<KEY, VALUE>(map); } public static <KEY, VALUE> ConcurrentHashMap<KEY, VALUE> newConcurrentHashMap(KEY key, VALUE value) { final ConcurrentHashMap<KEY, VALUE> map = newConcurrentHashMapSized(1); map.put(key, value); return map; } public static <KEY, VALUE> ConcurrentHashMap<KEY, VALUE> newConcurrentHashMap(KEY key1, VALUE value1, KEY key2, VALUE value2) { final ConcurrentHashMap<KEY, VALUE> map = newConcurrentHashMapSized(2); map.put(key1, value1); map.put(key2, value2); return map; } public static <KEY, VALUE> ConcurrentHashMap<KEY, VALUE> newConcurrentHashMapSized(int size) { return new ConcurrentHashMap<KEY, VALUE>(size); } }