org.apache.commons.io.comparator

类 DirectoryFileComparator

java.lang.Object

org.apache.commons.io.comparator.DirectoryFileComparator

所有已实现的接口:

Serializable, Comparator<File>

public class DirectoryFileComparator
extends Object
implements 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);
 

从以下版本开始:

2.0

另请参阅:

序列化表格

字段概要

字段

限定符和类型	字段和说明
static Comparator<File>	DIRECTORY_COMPARATOR Singleton default comparator instance
static Comparator<File>	DIRECTORY_REVERSE Singleton reverse default comparator instance

构造器概要

构造器

构造器和说明
DirectoryFileComparator()

方法概要

限定符和类型	方法和说明
int	compare(File file1, File file2) Compare the two files using the File.isDirectory() method.
File[]	sort(File... files) Sort an array of files.
List<File>	sort(List<File> files) Sort a List of files.
String	toString() String representation of this file comparator.

从类继承的方法 java.lang.Object

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

从接口继承的方法 java.util.Comparator

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

字段详细资料

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

构造器详细资料

DirectoryFileComparator

public DirectoryFileComparator()

方法详细资料

compare

public int compare(File file1,
                   File file2)

Compare the two files using the File.isDirectory() method.

指定者:

compare 在接口中 Comparator<File>

参数:

file1 - The first file to compare

file2 - The second file to compare

返回:

the result of calling file1's File.compareTo(File) with file2 as the parameter.

sort

public File[] sort(File... files)

Sort an array of files.

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

参数:

files - The files to sort, may be null

返回:

The sorted array

从以下版本开始:

2.0

sort

public List<File> sort(List<File> files)

Sort a List of files.

This method uses Collections.sort(List, Comparator) and returns the original list.

参数:

files - The files to sort, may be null

返回:

The sorted list

从以下版本开始:

2.0

toString

public String toString()

String representation of this file comparator.

覆盖:

toString 在类中 Object

返回:

String representation of this file comparator