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diff --git a/src/org/apache/commons/lang3/tuple/MutablePair.java b/src/org/apache/commons/lang3/tuple/MutablePair.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.lang3.tuple;
+
+/**
+ * <p>A mutable pair consisting of two {@code Object} elements.</p>
+ * 
+ * <p>Not #ThreadSafe#</p>
+ *
+ * @param <L> the left element type
+ * @param <R> the right element type
+ *
+ * @since Lang 3.0
+ * @version $Id: MutablePair.java 1127544 2011-05-25 14:35:42Z scolebourne $
+ */
+public class MutablePair<L, R> extends Pair<L, R> {
+
+    /** Serialization version */
+    private static final long serialVersionUID = 4954918890077093841L;
+
+    /** Left object */
+    public L left;
+    /** Right object */
+    public R right;
+
+    /**
+     * <p>Obtains an immutable pair of from two objects inferring the generic types.</p>
+     * 
+     * <p>This factory allows the pair to be created using inference to
+     * obtain the generic types.</p>
+     * 
+     * @param <L> the left element type
+     * @param <R> the right element type
+     * @param left  the left element, may be null
+     * @param right  the right element, may be null
+     * @return a pair formed from the two parameters, not null
+     */
+    public static <L, R> MutablePair<L, R> of(L left, R right) {
+        return new MutablePair<L, R>(left, right);
+    }
+
+    /**
+     * Create a new pair instance of two nulls.
+     */
+    public MutablePair() {
+        super();
+    }
+
+    /**
+     * Create a new pair instance.
+     *
+     * @param left  the left value, may be null
+     * @param right  the right value, may be null
+     */
+    public MutablePair(L left, R right) {
+        super();
+        this.left = left;
+        this.right = right;
+    }
+
+    //-----------------------------------------------------------------------
+    /**
+     * {@inheritDoc}
+     */
+    @Override
+    public L getLeft() {
+        return left;
+    }
+
+    /**
+     * Sets the left element of the pair.
+     * 
+     * @param left  the new value of the left element, may be null
+     */
+    public void setLeft(L left) {
+        this.left = left;
+    }
+
+    /**
+     * {@inheritDoc}
+     */
+    @Override
+    public R getRight() {
+        return right;
+    }
+
+    /**
+     * Sets the right element of the pair.
+     * 
+     * @param right  the new value of the right element, may be null
+     */
+    public void setRight(R right) {
+        this.right = right;
+    }
+
+    /**
+     * Sets the {@code Map.Entry} value.
+     * This sets the right element of the pair.
+     * 
+     * @param value  the right value to set, not null
+     * @return the old value for the right element
+     */
+    public R setValue(R value) {
+        R result = getRight();
+        setRight(value);
+        return result;
+    }
+
+}