Where can I find an example Java code that uses the org.apache.commons.io.comparator package?

org.apache.commons.io.comparator package provides various java.util.Comparator implementations for java.io.File. These comparators can be used to sort lists and arrays of files, for example.

Prasad Saya provided a good Java example that uses the org.apache.commons.io.comparator package at javacodegeeks.com Website.

// Source: javacodegeeks.com
// Supports commons-io-2.6
// Supports commons-io-2.5

import org.apache.commons.io.comparator.LastModifiedFileComparator;
import java.io.File;
import java.util.Date;
import java.text.SimpleDateFormat;

public class LastModFileComparatorExample {
   public static void main(String [] args) {
      LastModifiedFileComparator comparator = new LastModifiedFileComparator();
      System.out.println("### Input files ###");
      File dir = new File("C:\\fyicenter\\commons-io-2.6\\");
      File [] files = dir.listFiles();
      printArrayContents(files);
      System.out.println("### Array sorted ###");
      files = comparator.sort(files);
      printArrayContents(files);
   }

   private static void printArrayContents(File [] files) {
      SimpleDateFormat formatter = new SimpleDateFormat("yyyy MMM dd HH:mm");
      for (File file : files) {
         Date date = new Date(file.lastModified());
         System.out.println(formatter.format(date) + "   " + file.getName());
      }
      System.out.println("");
   }
}

You can compile and run the above example in a command window as shown below:

C:\fyicenter>javac -cp C:\fyicenter\commons-io-2.6\commons-io-2.6.jar 
   LastModFileComparatorExample.java

C:\fyicenter>java -cp .;C:\fyicenter\commons-io-2.6\commons-io-2.6.jar 
   LastModFileComparatorExample

### Input files ###
2017 Oct 15 12:00   commons-io-2.6-javadoc.jar
2017 Oct 15 12:00   commons-io-2.6-test-sources.jar
2017 Oct 15 12:00   commons-io-2.6-tests.jar
2017 Oct 15 12:00   commons-io-2.6.jar
2017 Oct 15 12:00   docs
2017 Jun 06 22:21   LICENSE.txt
2017 Oct 14 13:57   NOTICE.txt
2017 Oct 15 11:52   RELEASE-NOTES.txt

### Array sorted ###
2017 Jun 06 22:21   LICENSE.txt
2017 Oct 14 13:57   NOTICE.txt
2017 Oct 15 11:52   RELEASE-NOTES.txt
2017 Oct 15 12:00   commons-io-2.6.jar
2017 Oct 15 12:00   docs
2017 Oct 15 12:00   commons-io-2.6-javadoc.jar
2017 Oct 15 12:00   commons-io-2.6-test-sources.jar
2017 Oct 15 12:00   commons-io-2.6-tests.jar

 

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