org.apache.commons.io.comparator

Class LastModifiedFileComparator

java.lang.Object

org.apache.commons.io.comparator.AbstractFileComparator

org.apache.commons.io.comparator.LastModifiedFileComparator

All Implemented Interfaces:

Serializable, Comparator<File>

public class LastModifiedFileComparator
extends AbstractFileComparator
implements Serializable

Compare the last modified date/time of two files for order (see FileUtils.lastModifiedUnchecked(File)).

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);
 

Deprecating Serialization

Serialization is deprecated and will be removed in 3.0.

See Also:

Serialized Form

Field Summary

Fields

Modifier and Type	Field and Description
static Comparator<File>	LASTMODIFIED_COMPARATOR Last modified comparator instance.
static Comparator<File>	LASTMODIFIED_REVERSE Reverse last modified comparator instance.

Constructor Summary

Constructors

Constructor and Description
LastModifiedFileComparator() Construct a new instance.

Method Summary

Modifier and Type	Method and Description
int	compare(File file1, File file2) Compares the last modified date/time of two files.

Methods inherited from class org.apache.commons.io.comparator.AbstractFileComparator

sort, sort, toString

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

Methods inherited from interface java.util.Comparator

comparing, comparing, comparingDouble, comparingInt, comparingLong, equals, naturalOrder, nullsFirst, nullsLast, reversed, reverseOrder, thenComparing, thenComparing, thenComparing, thenComparingDouble, thenComparingInt, thenComparingLong

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()

Construct a new instance.

Method Detail

compare

public int compare(File file1,
                   File file2)

Compares 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 last modified date/time is less than the second, zero if the last modified date/time are the same and a positive value if the first files last modified date/time is greater than the second file.