Java для собеседования: Spring и основы

1@Service
2public class UserService {
3    @Autowired
4    private UserRepository repo;
5}

1@RestController
2@RequestMapping("/api/users")
3public class UserController {
4    @GetMapping
5    public List<User> getAll() { ... }
6}

1@Entity
2public class User {
3    @Id
4    @GeneratedValue
5    private Long id;
6    private String name;
7}

1public synchronized void increment() {
2    count++;
3}

1CompletableFuture.supplyAsync(() -> fetchData())
2    .thenApply(data -> process(data));