Java 中的扫描器错误：找不到行错误 [关闭]

Question

我正在尝试使用扫描仪写入和读取 txt。但我一直收到这个错误“找不到行”

这是代码

public class LoadAndStoreDataToFile {
  final static String FULLTIMETYPE = "FULLTIME";
  final static String PARTTIMETYPE = "PARTTIME";
  final static String FILENAME = "students.obj";

  public static Student createStudent() {
    Scanner sc = new Scanner(System.in);
    System.out.print("Enter student ID: ");  
    String sID = sc.nextLine();

    System.out.print("Enter student full name: ");  
    String sFullName = sc.nextLine();

    System.out.print("Enter student major (IT, SE, IS, etc.): ");  
    String sMajor = sc.nextLine();

    System.out.print("Enter student type (FULLTIME or PARTTIME): ");
    String sType = sc.nextLine();
    
    System.out.print("Enter student GPA: ");
    double sGPA = sc.nextDouble();

    Student student;
    if (sType.toUpperCase().equals(FULLTIMETYPE)) {
      student = new FullTimeStudent(sID, sFullName, sMajor, sGPA);
    } else if (sType.toUpperCase().equals(PARTTIMETYPE)) {
      System.out.print("Enter student min hour: ");
      int minHour = sc.nextInt();
      System.out.print("Enter max hour: ");
      int maxHour = sc.nextInt();
      student = new PartTimeStudent(sID, sFullName, sMajor, sGPA, minHour, maxHour);
    } else {
      System.out.println("Student type must be Fulltime or Parttime");
      student = null;
    }

    sc.close();
    return student;
  }

  // Allow the user to create several student objects
  public static void getDataFromUser(List<Student> students) {
    Scanner sc = new Scanner(System.in);
    boolean wantToExit;

    System.out.print("Create a new student (Enter) or Exit (X, then Enter)? ");

    wantToExit = sc.nextLine().equals("X");

    while(true) {
      if (wantToExit == false) {
        Student student = createStudent();
        if (student != null) {
          students.add(student);
        }
      } else {
        break;
      }
    }
    sc.close();
    System.out.println("getDataFromUser is done!");
  }
}

我尝试将 sc.close 放在别处，但错误仍然存在。我知道这是 hasnext() 或 nextline() 的问题，但找不到问题发生的位置。

编辑：错误发生在 createStudent()