public class Main { public static void main(String[] args) { System.out.println("Hello World"); } } -------------------------------- @SpringBootApplication @RestController @RequestMapping("/tasks") public class Main{ private final List<Task> tasks = new ArrayList<>(); private final AtomicLong idGenerator = new AtomicLong(1); public static void main(String[] args){ SpringApplication.run(Main.class, args); } @PostMapping @ResponseStatus(HttpStatus.CREATED) public Task createTask(@RequestBody CreateTaskRequest request){ Task task = new Task(idGenerator.getAndIncrement(), request.title()); tasks.add(task); return task; } @GetMapping public List<Task> getAllTasks(){ return tasks; } public record CreateTaskRequest(String title){ } public record Task(Long id, String title){ } }