Instead of id name needs to be display spring boot

I have a Spring Boot application which saves and retrieves tasks. During the retrieval, I want to display student name instead of student id.
I have attached my current code below. This is what the response in Postman looks like this format.

  {
        "taskid": 4,
        "taskname": "taskkk",
        "description": "ssstaskkk",
        "complete": true,
        "studentId": 1
    }

TaskController

@GetMapping(path="/getAllTasks")
    public List<TaskDTO> getAllTasks()
    {
        List<TaskDTO> allTasks = taskService.getAllTasks();
        System.out.println(allTasks.size());
        System.out.println(allTasks);
        return allTasks;
    }

TaskService

  List<TaskDTO> getAllTasks();

TaskServiceIMPL

@Override
public List<TaskDTO> getAllTasks() {


    List<Task> getTasks = taskRepo.findAll();

    System.out.println(getTasks);

    List<TaskDTO> taskDTOList = new ArrayList<>();

    for(Task t:getTasks)
    {
        TaskDTO taskDTO = new TaskDTO(
                t.getTaskid(),
                t.getTaskname(),
                t.getDescription(),
                 t.getComplete(),
                t.getStudent().getStudentid()
        );
        taskDTOList.add(taskDTO);
    }
    return taskDTOList;
}

Task

public class Task {

    @Id
    @Column(name = "task_id", length = 50)
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    private Long taskid;

    @Column(name = "task_name")
    private String taskname;

    @Column(name = "description")
    private String description;

    @Column(name = "complete")
    private Boolean complete;

    @OneToOne
    @JoinColumn(name = "student_id")
    private Student student;
}

TaskRepo

public interface TaskRepo extends JpaRepository<Task,Long >
{

}

Student Entity

@Id
@GeneratedValue(strategy =GenerationType.IDENTITY)
@Column(name="student_id", length = 50)
private Long  studentid;

@Column(name="student_name", length = 50)
private String studentname;

@Column(name="address", length = 70)
private String address;

@Column(name="mobile", length = 12)
private int mobile;

@Column(name="activestate", columnDefinition = "TINYINT default 1")
private boolean activestate;

Student DTO

public class StudentDTO {
    private Long studentid;
    private String studentname;
    private String address;
    private int mobile;
    private boolean activestate;
}

From you TaskController, you are returning a list of TaskDTO objects.
In order to display student names, you need to add StudentDTO class inside your TaskDTO class. Your TaskDTO class should be like below:

Modified TaskDTO:

public class TaskDTO {
    private Long taskid;
    private String taskname;
    private String description;
    private Boolean complete;
    private StudentDTO student; // Use StudentDTO here along 
                                  with it's constructor,getters,setters.
}

Now, you need to update your TaskServiceIMPL to create TaskDTO objects with StudentDTO.

Modified TaskServiceIMPL:

@Override
public List<TaskDTO> getAllTasks() {
    List<Task> getTasks = taskRepo.findAll();

    List<TaskDTO> taskDTOList = new ArrayList<>();

    for(Task t : getTasks) {
        Student student = t.getStudent(); // Get the associated student
        StudentDTO studentDTO = new StudentDTO(
            student.getStudentid(),
            student.getStudentname(),
            student.getAddress(),
            student.getMobile(),
            student.isActivestate()
        );
        
        TaskDTO taskDTO = new TaskDTO(
            t.getTaskid(),
            t.getTaskname(),
            t.getDescription(),
            t.getComplete(),
            studentDTO // Set the StudentDTO object here
        );
        
        taskDTOList.add(taskDTO);
    }
    return taskDTOList;
}

Now, your TaskController should return the modified TaskDTO