8.UserDetailsManager 인터페이스

public interface UserDetailsManager extends UserDetailsService {  
  
	// Create a new user with the supplied details.
    void createUser(UserDetails user);
	
	// Update the specified user.
    void updateUser(UserDetails user);
	
	// Remove the user with the given login name from the system.
	void deleteUser(String username); 
  
    
	// Modify the current user's password.
    void changePassword(String oldPassword, String newPassword);
  
    // Check if a user with the supplied login name exists in the system.
    boolean userExists(String username);
}