Listing the Content by Applying a User-Defined Filter - Java File Path IO

Java examples for File Path IO:Directory Content

  1. HOME
  2. Java
  3. File Path IO
  4. Directory Content

Introduction

To write your own filter, implementing the DirectoryStream.Filter<T> interface.

DirectoryStream.Filter<T> interface has a single method, accept().

Demo Code

import java.io.IOException;
import java.nio.file.DirectoryStream;
import java.nio.file.Files;
import java.nio.file.LinkOption;
import java.nio.file.Path;
import java.nio.file.Paths;

public class Main {
  public static void main(String[] args) {

    Path path = Paths.get("C:/folder1/folder2/folder4");

    // user-defined filter - only directories are accepted
    DirectoryStream.Filter<Path> dir_filter = new DirectoryStream.Filter<Path>() {

      public boolean accept(Path path) throws IOException {
        return (Files.isDirectory(path, LinkOption.NOFOLLOW_LINKS));
      }/*  w  ww.ja v  a  2 s  .c om*/
    };

    System.out.println("\nUser defined filter applied:");

    try (DirectoryStream<Path> ds = Files.newDirectoryStream(path, dir_filter)) {
      for (Path file : ds) {
        System.out.println(file.getFileName());
      }
    } catch (IOException e) {
      System.err.println(e);
    }
  }
}

Result


Related Tutorials