Package 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:

java.io.Serializable, java.util.Comparator<java.io.File>

public class LastModifiedFileComparator
extends AbstractFileComparator
implements java.io.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 = ...
       LastModifiedFileComparator.LASTMODIFIED_COMPARATOR.sort(list);
 

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

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

Since:

1.4

Version:

$Id: LastModifiedFileComparator.java 1304052 2012-03-22 20:55:29Z ggregory $

See Also:

Serialized Form

Field Summary

Fields

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

Constructor Summary

Constructors

Constructor	Description
LastModifiedFileComparator()

Method Summary

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

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

sort, sort, toString

Methods inherited from interface java.util.Comparator

equals, reversed, thenComparing, thenComparing, thenComparing, thenComparingDouble, thenComparingInt, thenComparingLong

Methods inherited from class java.lang.Object

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

Field Detail

LASTMODIFIED_COMPARATOR

public static final java.util.Comparator<java.io.File> LASTMODIFIED_COMPARATOR

Last modified comparator instance

LASTMODIFIED_REVERSE

public static final java.util.Comparator<java.io.File> LASTMODIFIED_REVERSE

Reverse last modified comparator instance

Constructor Detail

LastModifiedFileComparator

public LastModifiedFileComparator()

Method Detail

compare

public int compare(java.io.File file1,
                   java.io.File file2)

Compare the last the last modified date/time of two files.

Specified by:

compare in interface java.util.Comparator<java.io.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.