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diff --git a/src/main/java/org/apache/commons/math/stat/descriptive/SynchronizedSummaryStatistics.java b/src/main/java/org/apache/commons/math/stat/descriptive/SynchronizedSummaryStatistics.java
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+/*
+ * 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.
+ */
+package org.apache.commons.math.stat.descriptive;
+
+/**
+ * Implementation of
+ * {@link org.apache.commons.math.stat.descriptive.SummaryStatistics} that
+ * is safe to use in a multithreaded environment.  Multiple threads can safely
+ * operate on a single instance without causing runtime exceptions due to race
+ * conditions.  In effect, this implementation makes modification and access
+ * methods atomic operations for a single instance.  That is to say, as one
+ * thread is computing a statistic from the instance, no other thread can modify
+ * the instance nor compute another statistic.
+ *
+ * @since 1.2
+ * @version $Revision: 811685 $ $Date: 2009-09-05 19:36:48 +0200 (sam. 05 sept. 2009) $
+ */
+public class SynchronizedSummaryStatistics extends SummaryStatistics {
+
+    /** Serialization UID */
+    private static final long serialVersionUID = 1909861009042253704L;
+
+    /**
+     * Construct a SynchronizedSummaryStatistics instance
+     */
+    public SynchronizedSummaryStatistics() {
+        super();
+    }
+
+    /**
+     * A copy constructor. Creates a deep-copy of the {@code original}.
+     *
+     * @param original the {@code SynchronizedSummaryStatistics} instance to copy
+     */
+    public SynchronizedSummaryStatistics(SynchronizedSummaryStatistics original) {
+        copy(original, this);
+    }
+
+    /**
+     * {@inheritDoc}
+     */
+    @Override
+    public synchronized StatisticalSummary getSummary() {
+        return super.getSummary();
+    }
+
+    /**
+     * {@inheritDoc}
+     */
+    @Override
+    public synchronized void addValue(double value) {
+        super.addValue(value);
+    }
+
+    /**
+     * {@inheritDoc}
+     */
+    @Override
+    public synchronized long getN() {
+        return super.getN();
+    }
+
+    /**
+     * {@inheritDoc}
+     */
+    @Override
+    public synchronized double getSum() {
+        return super.getSum();
+    }
+
+    /**
+     * {@inheritDoc}
+     */
+    @Override
+    public synchronized double getSumsq() {
+        return super.getSumsq();
+    }
+
+    /**
+     * {@inheritDoc}
+     */
+    @Override
+    public synchronized double getMean() {
+        return super.getMean();
+    }
+
+    /**
+     * {@inheritDoc}
+     */
+    @Override
+    public synchronized double getStandardDeviation() {
+        return super.getStandardDeviation();
+    }
+
+    /**
+     * {@inheritDoc}
+     */
+    @Override
+    public synchronized double getVariance() {
+        return super.getVariance();
+    }
+
+    /**
+     * {@inheritDoc}
+     */
+    @Override
+    public synchronized double getMax() {
+        return super.getMax();
+    }
+
+    /**
+     * {@inheritDoc}
+     */
+    @Override
+    public synchronized double getMin() {
+        return super.getMin();
+    }
+
+    /**
+     * {@inheritDoc}
+     */
+    @Override
+    public synchronized double getGeometricMean() {
+        return super.getGeometricMean();
+    }
+
+    /**
+     * {@inheritDoc}
+     */
+    @Override
+    public synchronized String toString() {
+        return super.toString();
+    }
+
+    /**
+     * {@inheritDoc}
+     */
+    @Override
+    public synchronized void clear() {
+        super.clear();
+    }
+
+    /**
+     * {@inheritDoc}
+     */
+    @Override
+    public synchronized boolean equals(Object object) {
+        return super.equals(object);
+    }
+
+    /**
+     * {@inheritDoc}
+     */
+    @Override
+    public synchronized int hashCode() {
+        return super.hashCode();
+    }
+
+    /**
+     * {@inheritDoc}
+     */
+    @Override
+    public synchronized StorelessUnivariateStatistic getSumImpl() {
+        return super.getSumImpl();
+    }
+
+    /**
+     * {@inheritDoc}
+     */
+    @Override
+    public synchronized void setSumImpl(StorelessUnivariateStatistic sumImpl) {
+        super.setSumImpl(sumImpl);
+    }
+
+    /**
+     * {@inheritDoc}
+     */
+    @Override
+    public synchronized StorelessUnivariateStatistic getSumsqImpl() {
+        return super.getSumsqImpl();
+    }
+
+    /**
+     * {@inheritDoc}
+     */
+    @Override
+    public synchronized void setSumsqImpl(StorelessUnivariateStatistic sumsqImpl) {
+        super.setSumsqImpl(sumsqImpl);
+    }
+
+    /**
+     * {@inheritDoc}
+     */
+    @Override
+    public synchronized StorelessUnivariateStatistic getMinImpl() {
+        return super.getMinImpl();
+    }
+
+    /**
+     * {@inheritDoc}
+     */
+    @Override
+    public synchronized void setMinImpl(StorelessUnivariateStatistic minImpl) {
+        super.setMinImpl(minImpl);
+    }
+
+    /**
+     * {@inheritDoc}
+     */
+    @Override
+    public synchronized StorelessUnivariateStatistic getMaxImpl() {
+        return super.getMaxImpl();
+    }
+
+    /**
+     * {@inheritDoc}
+     */
+    @Override
+    public synchronized void setMaxImpl(StorelessUnivariateStatistic maxImpl) {
+        super.setMaxImpl(maxImpl);
+    }
+
+    /**
+     * {@inheritDoc}
+     */
+    @Override
+    public synchronized StorelessUnivariateStatistic getSumLogImpl() {
+        return super.getSumLogImpl();
+    }
+
+    /**
+     * {@inheritDoc}
+     */
+    @Override
+    public synchronized void setSumLogImpl(StorelessUnivariateStatistic sumLogImpl) {
+        super.setSumLogImpl(sumLogImpl);
+    }
+
+    /**
+     * {@inheritDoc}
+     */
+    @Override
+    public synchronized StorelessUnivariateStatistic getGeoMeanImpl() {
+        return super.getGeoMeanImpl();
+    }
+
+    /**
+     * {@inheritDoc}
+     */
+    @Override
+    public synchronized void setGeoMeanImpl(StorelessUnivariateStatistic geoMeanImpl) {
+        super.setGeoMeanImpl(geoMeanImpl);
+    }
+
+    /**
+     * {@inheritDoc}
+     */
+    @Override
+    public synchronized StorelessUnivariateStatistic getMeanImpl() {
+        return super.getMeanImpl();
+    }
+
+    /**
+     * {@inheritDoc}
+     */
+    @Override
+    public synchronized void setMeanImpl(StorelessUnivariateStatistic meanImpl) {
+        super.setMeanImpl(meanImpl);
+    }
+
+    /**
+     * {@inheritDoc}
+     */
+    @Override
+    public synchronized StorelessUnivariateStatistic getVarianceImpl() {
+        return super.getVarianceImpl();
+    }
+
+    /**
+     * {@inheritDoc}
+     */
+    @Override
+    public synchronized void setVarianceImpl(StorelessUnivariateStatistic varianceImpl) {
+        super.setVarianceImpl(varianceImpl);
+    }
+
+    /**
+     * Returns a copy of this SynchronizedSummaryStatistics instance with the
+     * same internal state.
+     *
+     * @return a copy of this
+     */
+    @Override
+    public synchronized SynchronizedSummaryStatistics copy() {
+        SynchronizedSummaryStatistics result =
+            new SynchronizedSummaryStatistics();
+        copy(this, result);
+        return result;
+    }
+
+    /**
+     * Copies source to dest.
+     * <p>Neither source nor dest can be null.</p>
+     * <p>Acquires synchronization lock on source, then dest before copying.</p>
+     *
+     * @param source SynchronizedSummaryStatistics to copy
+     * @param dest SynchronizedSummaryStatistics to copy to
+     * @throws NullPointerException if either source or dest is null
+     */
+    public static void copy(SynchronizedSummaryStatistics source,
+            SynchronizedSummaryStatistics dest) {
+        synchronized (source) {
+            synchronized (dest) {
+                SummaryStatistics.copy(source, dest);
+            }
+        }
+    }
+
+}