在我的java代码中，当我尝试获取字符串形式的输入时，所以Scanner.next()和当我运行它时< code >线程" main " Java . util . nosuchelementexception中的异常这是我的代码

import java.util.Scanner;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.ObjectOutputStream;
import java.util.*;

public class App {
    static int choice;
    static Thread t;
    static boolean isCompleteLoading;

   public static void main(String[] args) throws Exception {
      System.out.println();
        mainMenu ();
    }

    static void Register () throws FileNotFoundException, IOException {

        Scanner input = new Scanner(System.in);
        Student student1 = new Student();

        System.out.println("\n\t\t\t\t\t\t       WELCOME TO MAIN MENU");
        System.out.println("\t\t\t\t\t\t     ------------------------");

        System.out.print("\t\tEnter Your Name: ");
        student1.studentName = input.next();
        System.out.print("\t\tEnter Your Phone Number: ");
        student1.phoneNumber = input.nextDouble();
        System.out.print("\t\tEnter Your address: ");
        student1.address = input.next();
        System.out.print("\t\tEnter Your school name: ");
        student1.schoolName = input.next();
        System.out.print("\t\tHow do you wish to pay");
        System.out.print("\n\t\t\t 1.Full");
        System.out.print("\n\t\t\t 2.Half");
        System.out.print("\n\n\t\tEnter Your choice: ");
        student1.paymentType = input.nextInt();
        processing();

        ObjectOutputStream out = new ObjectOutputStream(new FileOutputStream("Person.txt"));
        out.writeObject(student1);
        input.close();
    }

    public static void processing() {
        t=new Thread() {
            public void run() {
                System.out.print("Processing---------");
                for(int i = 0;i <= 100;i++){
                    if(i < 10){
                        System.out.print(i+"%");
                        System.out.print("\b\b");
                    }
                    else if(i >= 10 && i <= 99){
                        System.out.print(i+"%");
                        System.out.print("\b\b\b");
                    }
                    else{
                     System.out.println(i+"%");
                     isCompleteLoading = true;
                    }
                    try {
                        t.sleep(100);
                    } catch(Exception e) {

                    }
                }
            }
        };
        t.start();
  }

    public static void mainMenu () throws FileNotFoundException, IOException {

        Scanner in = new Scanner(System.in);

        System.out.println("\t\t\t\t\t\t ANATHA STUDENT MANAGEMENT SYSTEM");
        System.out.println("\n\t\t\t\t\t\t       WELCOME TO MAIN MENU");
        System.out.println("\n\n\t\t\t\t 1.Register New Student");
        System.out.println("\t\t\t\t 2.Find Student");
        System.out.print("\n\t\t\t Enter Your choice: ");

        choice = in.nextInt();

        in.close();

        switch (choice) {
            case 1:
                Register ();
                break;

            default:
                break;
        }
    }
}

错误

Exception in thread "main" java.util.NoSuchElementException
    at java.base/java.util.Scanner.throwFor(Scanner.java:937)
    at java.base/java.util.Scanner.next(Scanner.java:1478)
    at App.Register(App.java:27)
    at App.mainMenu(App.java:90)
    at App.main(App.java:15)

为什么会出现此错误？