private User findById(Long id) {
    if (id > 3) return null;
    User user = new User();
    user.id = id;
    user.name = "User " + String.valueOf(id);
    return user;
  }
private User findById(Long id) {
    if (id > 3) return null;
    User user = new User();
    user.id = id;
    user.name = "User " + String.valueOf(id);
    return user;
  }
private User findById ( Long id ) { if ( id > 3 ) return null ; User user = new User ( ) ; user . id = id ; user . name = "User " + String . valueOf ( id ) ; return user ; }
designed to be lightweight operation
designed to be lightweight operation