This code reads and prints the name of all the files and folders in a particular parent folder.

 import java.io.File;

public class DirectoryReader {

  public static void main(String[] args) {

    File folder = new File("c:/");
    File[] listOfFiles = folder.listFiles();

    for (int i = 0; i < listOfFiles.length; i++) {
      if (listOfFiles[i].isFile()) {
        System.out.println("File " + listOfFiles[i].getName());
      } else if (listOfFiles[i].isDirectory()) {
        System.out.println("Directory " + listOfFiles[i].getName());
      }
    }
  }

}