问在java中遍历列表列表

EN

User
_________________________________________
| Id  | user_name | full_name | creator |
_________________________________________
| 1   | a         | A         | a       |
| 2   | b         | B         | a       |
| 3   | c         | C         | a       |
| 4   | d         | D         | c       |
| 5   | e         | E         | c       |
| 6   | f         | F         | e       |
| 7   | g         | G         | e       |
| 8   | h         | H         | e       |
| 9   | i         | I         | e       |
|10   | j         | J         | i       |
_________________________________________

Roles
_______________________________________
| id | user_mgmt | others | user_id |
_______________________________________
| 1  | 1        | 1      | 1           |
| 2  | 0        | 1      | 2           |
| 3  | 1        | 0      | 3           |
| 4  | 0        | 1      | 4           |
| 5  | 1        | 1      | 5           |
| 6  | 0        | 1      | 6           |
| 7  | 0        | 0      | 7           |
| 8  | 0        | 0      | 8           |
| 9  | 1        | 0      | 9           |
________________________________________

public void loadUsers(){
  List<Users> users = new ArrayList<>();

  String creator = user.getUserName();
  List<Users> createdUsers = userService.getUsersByCreator(creator);
  for(Users user : createdUsers) {
    Roles role = createdUsers.getRoles();
    if(role.isEmpMgnt()){
      users.add(user);
      loadUsers();
    }
  }
}