@@ -0,0 +1,1634 @@
+/*%0A * Licensed to the Apache Software Foundation (ASF) under one or more%0A * contributor license agreements.  See the NOTICE file distributed with%0A * this work for additional information regarding copyright ownership.%0A * The ASF licenses this file to You under the Apache License, Version 2.0%0A * (the %22License%22); you may not use this file except in compliance with%0A * the License.  You may obtain a copy of the License at%0A *%0A *      http://www.apache.org/licenses/LICENSE-2.0%0A *%0A * Unless required by applicable law or agreed to in writing, software%0A * distributed under the License is distributed on an %22AS IS%22 BASIS,%0A * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.%0A * See the License for the specific language governing permissions and%0A * limitations under the License.%0A */%0A%0Apackage org.apache.commons.lang3.mutable;%0A%0Aimport java.util.concurrent.atomic.AtomicInteger;%0A%0Aimport org.apache.commons.lang3.time.DurationUtils;%0A%0A/**%0A * Prints out the difference time working with %7B@link MutableInt%7D and %7B@link AtomicInteger%7D.%0A */%0Apublic class PrintAtomicVsMutable %7B%0A%0A    public static void main(String%5B%5D args) %7B%0A        MutableInt mInt = new MutableInt();%0A        final int max = 100_000_000;%0A        System.out.println(%22MutableInt %22 + DurationUtils.of(() -%3E %7B%0A            for (int i = 0; i %3C max; i++) %7B%0A                mInt.incrementAndGet();%0A            %7D%0A        %7D));%0A        AtomicInteger aInt = new AtomicInteger();%0A        System.out.println(%22AtomicInteger %22 + DurationUtils.of(() -%3E %7B%0A            for (int i = 0; i %3C max; i++) %7B%0A                aInt.incrementAndGet();%0A            %7D%0A        %7D));%0A    %7D%0A%7D%0A

Add a main test class to prints out the difference time working with MutableInt AtomicInteger.