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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-M1

/*
 * 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 collection and map related key/value classes.
 * These are usually used in maps, however they can be used as data holders in any collection.
 * 
 * The following key/value designs are included:
 * 

 *   Map Entry - various map entry implementations
 *   
KeyValue - a key and value pair, without map entry semantics
 *   
MultiKey - a holder of multiple keys tied together
 * 
 *
 */
package org.apache.commons.collections4.keyvalue;