Java使用final构造器注入方式更安全

普通玩家

private final UserRepository userRepository;

public UserResource(UserRepository userRepository) {
    this.userRepository= userRepository;
}

高级玩家

• 添加在类上

@RequiredArgsConstructor(onConstructor = @__(@Autowired))

final注入

private final UserValidator userValidator ;
private final UserRepository userRepository;
private final UserClient userClient;