如何在Java中搜索具有特定文件扩展名的目录？

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