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Commons IO example source code file (LastModifiedFileComparator.java)

This example Commons IO source code file (LastModifiedFileComparator.java) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Java - Commons IO tags/keywords

abstractfilecomparator, abstractfilecomparator, comparator, comparator, file, io, lastmodified_comparator, lastmodified_comparator, lastmodified_reverse, lastmodifiedfilecomparator, lastmodifiedfilecomparator, reversecomparator, serializable, util

The Commons IO LastModifiedFileComparator.java source code

 * 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,
 * 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 the <b>last modified date/time of two files for order 
 * (see {@link File#lastModified()}).
 * <p>
 * This comparator can be used to sort lists or arrays of files
 * by their last modified date/time.
 * <p>
 * Example of sorting a list of files using the
 * {@link #LASTMODIFIED_COMPARATOR} singleton instance:
 * <pre>
 *       List<File> list = ...
 *       LastModifiedFileComparator.LASTMODIFIED_COMPARATOR.sort(list);
 * </pre>
 * <p>
 * Example of doing a <i>reverse sort of an array of files using the
 * {@link #LASTMODIFIED_REVERSE} singleton instance:
 * <pre>
 *       File[] array = ...
 *       LastModifiedFileComparator.LASTMODIFIED_REVERSE.sort(array);
 * </pre>
 * <p>
 * @version $Revision: 721626 $ $Date: 2008-11-29 04:46:54 +0000 (Sat, 29 Nov 2008) $
 * @since Commons IO 1.4
public class LastModifiedFileComparator extends AbstractFileComparator implements Serializable {

    /** Last modified comparator instance */
    public static final Comparator<File> LASTMODIFIED_COMPARATOR = new LastModifiedFileComparator();

    /** Reverse last modified comparator instance */
    public static final Comparator<File> LASTMODIFIED_REVERSE = new ReverseComparator(LASTMODIFIED_COMPARATOR);

     * Compare the last the last modified date/time of two files.
     * @param file1 The first file to compare
     * @param file2 The second file to compare
     * @return a negative value if the first file's lastmodified date/time
     * is less than the second, zero if the lastmodified date/time are the
     * same and a positive value if the first files lastmodified date/time
     * is greater than the second file.
    public int compare(File file1, File file2) {
        long result = file1.lastModified() - file2.lastModified();
        if (result < 0) {
            return -1;
        } else if (result > 0) {
            return 1;
        } else {
            return 0;

Other Commons IO examples (source code examples)

Here is a short list of links related to this Commons IO LastModifiedFileComparator.java source code file:

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