    001    /*
    002     * Licensed to the Apache Software Foundation (ASF) under one or more
    003     * contributor license agreements.  See the NOTICE file distributed with
    004     * this work for additional information regarding copyright ownership.
    005     * The ASF licenses this file to You under the Apache License, Version 2.0
    006     * (the "License"); you may not use this file except in compliance with
    007     * the License.  You may obtain a copy of the License at
    008     *
    009     *      http://www.apache.org/licenses/LICENSE-2.0
    010     *
    011     * Unless required by applicable law or agreed to in writing, software
    012     * distributed under the License is distributed on an "AS IS" BASIS,
    013     * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    014     * See the License for the specific language governing permissions and
    015     * limitations under the License.
    016     */
    017    package org.apache.commons.math.stat.descriptive.rank;
    018
    019    import java.io.Serializable;
    020
    021
    022    /**
    023     * Returns the median of the available values.  This is the same as the 50th percentile.
    024     * See {@link Percentile} for a description of the algorithm used.
    025     * <p>
    026     * <strong>Note that this implementation is not synchronized.</strong> If
    027     * multiple threads access an instance of this class concurrently, and at least
    028     * one of the threads invokes the <code>increment()</code> or
    029     * <code>clear()</code> method, it must be synchronized externally.</p>
    030     *
    031     * @version $Revision: 811685 $ $Date: 2009-09-05 19:36:48 +0200 (sam. 05 sept. 2009) $
    032     */
    033    public class Median extends Percentile implements Serializable {
    034
    035        /** Serializable version identifier */
    036        private static final long serialVersionUID = -3961477041290915687L;
    037
    038        /**
    039         * Default constructor.
    040         */
    041        public Median() {
    042            super(50.0);
    043        }
    044
    045        /**
    046         * Copy constructor, creates a new {@code Median} identical
    047         * to the {@code original}
    048         *
    049         * @param original the {@code Median} instance to copy
    050         */
    051        public Median(Median original) {
    052            super(original);
    053        }
    054
    055    }