FileRecursion

class File {
  static const int FOLDER = 1;
  static const int FILE = 2;

  int type;
  String name;
  List<File> children = [];

  File();

  List<String> findFile(String pattern, [String start = '']) {
    final List<String> ret = [];

    final newStart = start.isNotEmpty ? '$start/$name' : name;
    if (name.contains(pattern)) {
      ret.add(newStart);
    }

    for (final el in children) {
      var x = el.findFile(pattern, newStart);
      ret.addAll(x);
    }

    return ret;
  }
}

void main() {
  final f = File()
    ..name = ''
    ..children = [
      File()
        ..name = 'pesho'
        ..children = [File()..name = 'code.java'],
      File()..name = 'code2.java'
    ];

  final res = f.findFile('.java');
  print(res);
}