कार्यान्वयन

import jakarta.persistence.*;@Entity
public class Task {
  @Id @GeneratedValue
  private Long id;
  private String title;
  private boolean done;
  // getters/setters omitted
}

import org.springframework.data.jpa.repository.JpaRepository;@Repository
public interface TaskRepository extends JpaRepository<Task, Long> {}

import org.springframework.stereotype.Service;import java.util.*;@Service
public class TaskService {
  private final TaskRepository repo;
  public TaskService(TaskRepository repo) { this.repo = repo; }
  public List<Task> all() { return repo.findAll(); }
  public Task save(Task t) { return repo.save(t); }
}

import org.springframework.web.bind.annotation.*;import java.util.*;@RestController
@RequestMapping("/tasks")
public class TaskController {
  private final TaskService service;
  public TaskController(TaskService service) { this.service = service; }
  @GetMapping public List<Task> all() { return service.all(); }
  @PostMapping public Task create(@RequestBody Task t) { return service.save(t); }
}