org.apache.commons.io.comparator

Class LastModifiedFileComparator

  • All Implemented Interfaces:
    Serializable, Comparator<File>


    public class LastModifiedFileComparatorextends Objectimplements Serializable
    Compare the last modified date/time of two files for order (see File.lastModified()).

    This comparator can be used to sort lists or arrays of files by their last modified date/time.

    Example of sorting a list of files using the LASTMODIFIED_COMPARATOR singleton instance:

           List<File> list = ...       ((AbstractFileComparator) LastModifiedFileComparator.LASTMODIFIED_COMPARATOR).sort(list); 

    Example of doing a reverse sort of an array of files using the LASTMODIFIED_REVERSE singleton instance:

           File[] array = ...       ((AbstractFileComparator) LastModifiedFileComparator.LASTMODIFIED_REVERSE).sort(array); 

    Since:
    1.4
    Version:
    $Id: LastModifiedFileComparator.java 1642757 2014-12-01 21:09:30Z sebb $
    See Also:
    Serialized Form
    • Field Detail

      • LASTMODIFIED_COMPARATOR

        public static final Comparator<File> LASTMODIFIED_COMPARATOR
        Last modified comparator instance
      • LASTMODIFIED_REVERSE

        public static final Comparator<File> LASTMODIFIED_REVERSE
        Reverse last modified comparator instance
    • Constructor Detail

      • LastModifiedFileComparator

        public LastModifiedFileComparator()
    • Method Detail

      • compare

        public int compare(File file1,          File file2)
        Compare the last the last modified date/time of two files.
        Specified by:
        compare in interface Comparator<File>
        Parameters:
        file1 - The first file to compare
        file2 - The second file to compare
        Returns:
        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.
      • sort

        public File[] sort(File... files)
        Sort an array of files.

        This method uses Arrays.sort(Object[], Comparator) and returns the original array.

        Parameters:
        files - The files to sort, may be null
        Returns:
        The sorted array
        Since:
        2.0
      • toString

        public String toString()
        String representation of this file comparator.
        Overrides:
        toString in class Object
        Returns:
        String representation of this file comparator

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