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The Apache Commons Collections package contains types that extend and augment the Java Collections Framework.

There is a newer version: 4.5.0-M2

/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You 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.
 */
/**
 * This package contains implementations of the {@link org.apache.commons.collections4.MultiValuedMap} interfaces.
 * A MultiValuedMap holds a collection of values against each key.
 * 
 * The following implementations are provided in the package:
 * 

 *   ArrayListValuedHashMap - ListValuedMap implementation using a HashMap/ArrayList
 *   
HashSetValuedHashMap   - SetValuedMap implementation using a HashMap/HashSet
 * 
 * 
 * The following decorators are provided in the package:
 * 

 *   Transformed - transforms elements added to the MultiValuedMap
 *   
Unmodifiable - ensures the collection cannot be altered
 * 
 *
 * @version $Id: package-info.java 1715302 2015-11-19 23:08:01Z tn $
 */
package org.apache.commons.collections4.multimap;