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The Apache Commons IO library contains utility classes, stream implementations, file filters, file comparators, endian transformation classes, and much more.

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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.io.comparator;

import java.io.File;
import java.io.Serializable;
import java.util.Comparator;

/**
 * Compare two files using the default {@link File#compareTo(File)} method.
 * 
 * This comparator can be used to sort lists or arrays of files
 * by using the default file comparison.
 * 

 * Example of sorting a list of files using the
 * {@link #DEFAULT_COMPARATOR} singleton instance:
 * 
 *       List<File> list = ...
 *       ((AbstractFileComparator) DefaultFileComparator.DEFAULT_COMPARATOR).sort(list);
 * 
 * 
 * Example of doing a reverse sort of an array of files using the
 * {@link #DEFAULT_REVERSE} singleton instance:
 * 
 *       File[] array = ...
 *       ((AbstractFileComparator) DefaultFileComparator.DEFAULT_REVERSE).sort(array);
 * 
 * 
 *
 * @since 1.4
 */
public class DefaultFileComparator extends AbstractFileComparator implements Serializable {

    private static final long serialVersionUID = 3260141861365313518L;

    /** Singleton default comparator instance */
    public static final Comparator DEFAULT_COMPARATOR = new DefaultFileComparator();

    /** Singleton reverse default comparator instance */
    public static final Comparator DEFAULT_REVERSE = new ReverseComparator(DEFAULT_COMPARATOR);

    /**
     * Compare the two files using the {@link File#compareTo(File)} method.
     *
     * @param file1 The first file to compare
     * @param file2 The second file to compare
     * @return the result of calling file1's
     * {@link File#compareTo(File)} with file2 as the parameter.
     */
    @Override
    public int compare(final File file1, final File file2) {
        return file1.compareTo(file2);
    }
}