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Saturday, 30 June 2018

Apache Commons IO - NameFileComparator

Apache Commons IO - NameFileComparator


Compare the names of two files. NameFileComparator can be used to sort 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 Serializable

Example of NameFileComparator Class

Here is the input file we need to parse −
Welcome to TutorialsPoint. Simply Easy Learning.
IOTester.java
import java.io.File;
import java.io.FileFilter;
import java.io.IOException;

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

public class IOTester {
   public static void main(String[] args) {
      try {
         usingNameFileComparator();
      } catch(IOException e) {
         System.out.println(e.getMessage());
      }
   }

   public static void usingNameFileComparator() throws IOException {
      //get the current directory
      File currentDirectory = new File(".");

      NameFileComparator comparator = new NameFileComparator(IOCase.INSENSITIVE);

      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

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