import static java.nio.file.FileVisitOption.*;
import java.nio.file.*;
import java.io.IOException;
import java.util.EnumSet;

public class FileTreeWalking {
  public static void main(String[] args) {
    Path treeBase = Paths.get(System.getProperty("java.home")).getParent().resolve("sample");
    FileVisitor<Path> listFiles = new ListFiles();
    int depth = 3;
    try {
      Files.walkFileTree(treeBase, EnumSet.of(FOLLOW_LINKS), depth, listFiles);
    } catch(IOException e) {
      e.printStackTrace();
    }
  }
}