How to search for a subdirectory from a parent directory? [closed]

Answer 1

Use Files.walkFileTree, it will recursively show your sub-directory corresponding to your parent directory.

public static void main(String[] args) throws IOException {
    Path startingDir = Paths
            .get("C:\\projects\\workspace\testing");
    Files.walkFileTree(startingDir, new FindJavaVisitor());
}

private static class FindJavaVisitor extends SimpleFileVisitor<Path> {
     @Override
    public FileVisitResult preVisitDirectory(Path dir, 
                          BasicFileAttributes attrs) throws IOException {
    if(dir.getFileName().toAbsolutePath().toString().contains("z1")){
        System.out.println("z1 is found at"+ dir.getFileName().toAbsolutePath());
    }
      return FileVisitResult.CONTINUE;
    }
}

Answer 2

You can do a simple recursive function with File.listFiles() method

  public Collection<File> findDir(File dir, String name) {
    ArrayList<File> result = new ArrayList<File>();
    if(!dir.isDirectory()) return result;
    for(File child : dir.listFiles()) {
      if(child.getName().equals(name)) result.add(child);
      result.addAll(findDir(child, name));
    }
    return result;
  }

Assuming you want to find all z1 directory inside C:\projects\workspace\testing then:

Collection<File> result = findDir(new File("C:/projects/workspace/testing"), "z1");