Javaで特定のファイル拡張子を持つディレクトリを検索するにはどうすればよいですか?

import java.io.IOException;
import java.nio.file.Files;
import java.nio.file.Path;
import java.nio.file.Paths;
import java.util.stream.Stream;
public class Demo {
   public static void main(String[] args) throws IOException {
      Stream<Path> path = Files.walk(Paths.get("D:\ExampleDirectory"));
      System.out.println("List of PDF files:");
      path = path.filter(var -> var.toString().endsWith(".pdf"));
      path.forEach(System.out::println);      
      path = Files.walk(Paths.get("D:\ExampleDirectory"));
      System.out.println("List of JPG files:");
      path = path.filter(var -> var.toString().endsWith(".jpg"));
      path.forEach(System.out::println);    
      path = Files.walk(Paths.get("D:\ExampleDirectory"));
      System.out.println("List of text files:");
      path = path.filter(var -> var.toString().endsWith(".txt"));
      path.forEach(System.out::println);      
      path = Files.walk(Paths.get("D:\ExampleDirectory"));
      System.out.println("List of word files:");
      path = path.filter(var -> var.toString().endsWith(".docx"));
      path.forEach(System.out::println);      
    }
}

List of PDF files:
D:\ExampleDirectory\demo1.pdf
D:\ExampleDirectory\demo2.pdf
List of JPG files:
D:\ExampleDirectory\sample_jpeg1.jpg
D:\ExampleDirectory\sample_jpeg2.jpg
List of text files:
D:\ExampleDirectory\sample1.txt
D:\ExampleDirectory\sample2.txt
D:\ExampleDirectory\sample3.txt
List of word files:
D:\ExampleDirectory\test1.docx
D:\ExampleDirectory\test2.docx

import java.io.File;
import java.io.FilenameFilter;
import java.io.IOException;
public class MyExample{
   public static void main(String args[]) throws IOException {
    //Creating a File object for directory
    File directoryPath = new File("D:\ExampleDirectory");
    //Creating filter for jpg files
    FilenameFilter jpgFilefilter = new FilenameFilter(){
         public boolean accept(File dir, String name) {
            String lowercaseName = name.toLowerCase();
            if (lowercaseName.endsWith(".pdf")) {
               return true;
            } else {
               return false;
            }
         }
      };        
      String imageFilesList[] = directoryPath.list(jpgFilefilter);
      System.out.println("List of the jpeg files in the specified directory:");  
      for(String fileName : imageFilesList) {
         System.out.println(fileName);
      }  
   }
}

List of the jpeg files in the specified directory:
demo1.pdf
demo2.pdf