Apache Commons IO - NameFileFilter Class

Overview

NameFileFilter class in Commons IO filters the file-names for a name.

Class Declaration

Following is the declaration for org.apache.commons.io.filefilter.NameFileFilter Class :

public class NameFileFilter
   extends AbstractFileFilter implements Serializable

Here is the input file we need to parse −

input.txt

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Example - Printing all files in current directory.

CommonsIoTester.java

package com.tutorialspoint;

import java.io.File;
import java.io.IOException;
import org.apache.commons.io.IOCase;
import org.apache.commons.io.filefilter.NameFileFilter;

public class CommonsIoTester {
   public static void main(String[] args) throws IOException {
      //get the current directory
      File currentDirectory = new File(".");
      //get names of all files and directory in current directory
      String[] files = currentDirectory.list();
      System.out.println("All files and Folders.\n");
      for( int i = 0; i < files.length; i++ ) {
         System.out.println(files[i]);
      }
   }
}

Output

It will print the following result −

All files and Folders.

.classpath
.project
.settings
bin
input.txt
output.txt
src

Example - Filtering a file by name as Case Insensitive

CommonsIoTester.java

package com.tutorialspoint;

import java.io.File;
import java.io.IOException;
import org.apache.commons.io.IOCase;
import org.apache.commons.io.filefilter.NameFileFilter;

public class CommonsIoTester {
   public static void main(String[] args) throws IOException {
      //get the current directory
      File currentDirectory = new File(".");
      System.out.println("\nFile with name input.txt\n");
      String[] acceptedNames = {"input", "input.txt"};
      String[] filesNames = currentDirectory.list( new NameFileFilter(acceptedNames, IOCase.INSENSITIVE) );
      for( int i = 0; i < filesNames.length; i++ ) {
         System.out.println(filesNames[i]);
      }
   }
}

Output

It will print the following result −

File with name input.txt

input.txt

Example - Filtering a file by name as Case Sensitive

CommonsIoTester.java

package com.tutorialspoint;

import java.io.File;
import java.io.IOException;
import org.apache.commons.io.IOCase;
import org.apache.commons.io.filefilter.NameFileFilter;

public class CommonsIoTester {
   public static void main(String[] args) throws IOException {
      //get the current directory
      File currentDirectory = new File(".");
	  System.out.println("\nFile with name input.txt\n");
      String[] acceptedNames = {"input", "input.txt"};
      String[] filesNames = currentDirectory.list( new NameFileFilter(acceptedNames, IOCase.SENSITIVE) );
      for( int i = 0; i < filesNames.length; i++ ) {
         System.out.println(filesNames[i]);
      }
   }
}

Output

It will print the following result −

File with name input.txt

input.txt