How to Delete folder and subfolders using Java 8

• How to delete folder with all files and sub folders in it using java 8.
• We can use java 8 Stream to delete folder recursively 
• Files.walk(rootPath, FileVisitOption.FOLLOW_LINKS)
• .sorted(Comparator.reverseOrder())
• .map(Path::toFile)
• .peek(System.out::println)
• .forEach(File::delete);

1. Files.walk -  this method return all files/directories below the parent folder
2. .sorted - sort the list in reverse order, so the folder itself comes after the including subfolders and files
3. .map - map the file path to file
4. .peek - points to processed entry
5. .forEach - on every File object calls the .delete() method 

#1: Java Example program to delete folders and subfolders using java 8 stream

1. package com.instanceofjava;
2. 
   
3. import java.io.File;
4. import java.io.IOException;
5. import java.nio.file.FileVisitOption;
6. import java.nio.file.Files;
7. import java.nio.file.Path;
8. import java.nio.file.Paths;
9. import java.util.Comparator;
10. /**
11.  * @author www.Instanceofjava.com
12.  * @category interview questions
13.  * 
14.  * Description: delete folders and sub folders using java 8
15.  *
16.  */
17. 
    
18. public class DeleteFolder {
19. 
    
20. public static void main(String[] args) {
21. Path rootPath = Paths.get("C:\\Users\\Saidesh kilaru\\Desktop\\folder1");
22. try {
23. Files.walk(rootPath, FileVisitOption.FOLLOW_LINKS)
24.     .sorted(Comparator.reverseOrder())
25.     .map(Path::toFile)
26.     .peek(System.out::println)
27.     .forEach(File::delete);
28. } catch (IOException e) {
29. e.printStackTrace();
30. }
31. }
32. 
    
33. }

Output:

1. C:\Users\Saidesh kilaru\Desktop\folder1\subfolder\file2 in sub folder.docx
2. C:\Users\Saidesh kilaru\Desktop\folder1\subfolder
3. C:\Users\Saidesh kilaru\Desktop\folder1\file1.docx
4. C:\Users\Saidesh kilaru\Desktop\folder1