How to list hidden files in a directory in Java?

The ListFiles() method returns an array containing objects (abstract paths) for all files (and directories) in the path represented by the current (File) object.

File Filter interface is a filter for filtering path names that can be passed as parameters to the listFiles() method. This method filters filenames based on the passed filter.

To get the hidden directories in a folder, implement a FileFilter that only accepts hidden directories and pass it as a parameter to the listFiles() method.

Example

import java.io.File;
import java.io.FileFilter;
import java.io.IOException;
public class Test{
   public static void main(String args[]) throws IOException {
    //Creating a File object for directory
    File directoryPath = new File("D:\ExampleDirectory");
    //Creating filter for directories files
    FileFilter fileFilter = new FileFilter(){
         public boolean accept(File dir) {          
            if (dir.isDirectory()&& dir.isHidden()) {
               return true;
            } else {
               return false;
            }
         }
      };        
      File[] list = directoryPath.listFiles(fileFilter);
      System.out.println("List of the jpeg files in the specified directory:");  
      for(File fileName : list) {
         System.out.println(fileName.getName());
         System.out.println(fileName);
      }  
   }
}

Output

List of the jpeg files in the specified directory:
hidden directory1
D:\ExampleDirectory\hidden directory1
hidden directory2
D:\ExampleDirectory\hidden directory2

We can also use the isHidden() method of the Files class to get the list of hidden files −

Example

import java.io.File;
import java.io.IOException;
import java.util.Arrays;
import java.util.stream.Stream;
public class Demo {
   public static void main(String[] args) throws IOException {
       File dir = new File("D:\ExampleDirectory");
       File[] files = dir.listFiles(File::isHidden);
       Stream <File> fileStream = Arrays.stream(files);
       fileStream.forEach(file -> System.out.println(file.getName()));
    }
}

Output

D:\ExampleDirectory\hidden directory1
D:\ExampleDirectory\hidden directory2

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