Apache Commons IO - NameFileComparator Class

Overview

NameFileComparator class compares the names of two files. It can be used to sort the lists or arrays of files, using their name, either in a case-sensitive, case-insensitive or system dependent case sensitive way.

Class Declaration

Following is the declaration for org.apache.commons.io.comparator.NameFileComparator Class −

public class NameFileComparator
   extends Object implements Serializapackage com.tutorialspoint;

Example - Sorting all files of current Directory.

CommonsIoTester.java

package com.tutorialspoint;

import java.io.File;

import org.apache.commons.io.IOCase;
import org.apache.commons.io.comparator.NameFileComparator;

public class CommonsIoTester {
   public static void main(String[] args) throws Exception {
      //get the current directory
      File currentDirectory = new File(".");
      NameFileComparator comparator = new
      NameFileComparator(IOCase.SENSITIVE);
      File[] sortedFiles = comparator.sort(currentDirectory.listFiles());
      System.out.println("Sorted By Name: ");
      for(File file:sortedFiles) {
         System.out.println(file.getName());
      }  
   }
}

Output

It will print the following result −

Sorted By Name: 
.classpath
.project
.settings
bin
input.txt
output.txt
src

Example - Sorting filtered files of current Directory.

CommonsIoTester.java

package com.tutorialspoint;

import java.io.File;
import java.io.FileFilter;

import org.apache.commons.io.IOCase;
import org.apache.commons.io.comparator.NameFileComparator;
import org.apache.commons.io.filefilter.FileFileFilter;

public class CommonsIoTester {
   public static void main(String[] args) throws Exception {
      //get the current directory
      File currentDirectory = new File(".");
      NameFileComparator comparator = new
      NameFileComparator(IOCase.SENSITIVE);
      File[] sortedFiles = comparator.sort(currentDirectory.listFiles((FileFilter)FileFileFilter.FILE));
      System.out.println("Sorted By Name: ");
      for(File file:sortedFiles) {
         System.out.println(file.getName());
      }  
   }
}

Output

It will print the following result −

Sorted By Name: 
.classpath
.project
input.txt
output.txt