org.apache.commons.io.comparator

Class DirectoryFileComparator

  • All Implemented Interfaces:
    Serializable, Comparator<File>


    public class DirectoryFileComparatorextends Objectimplements Serializable
    Compare two files using the File.isDirectory() method.

    This comparator can be used to sort lists or arrays by directories and files.

    Example of sorting a list of files/directories using the DIRECTORY_COMPARATOR singleton instance:

           List<File> list = ...       ((AbstractFileComparator) DirectoryFileComparator.DIRECTORY_COMPARATOR).sort(list); 

    Example of doing a reverse sort of an array of files/directories using the DIRECTORY_REVERSE singleton instance:

           File[] array = ...       ((AbstractFileComparator) DirectoryFileComparator.DIRECTORY_REVERSE).sort(array); 

    Since:
    2.0
    Version:
    $Id: DirectoryFileComparator.java 1642757 2014-12-01 21:09:30Z sebb $
    See Also:
    Serialized Form
    • Field Detail

      • DIRECTORY_COMPARATOR

        public static final Comparator<File> DIRECTORY_COMPARATOR
        Singleton default comparator instance
      • DIRECTORY_REVERSE

        public static final Comparator<File> DIRECTORY_REVERSE
        Singleton reverse default comparator instance
    • Constructor Detail

      • DirectoryFileComparator

        public DirectoryFileComparator()
    • Method Detail

      • 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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