获取此错误 -> Java 中线程“main”java.util.InputMismatc

Question

我收到错误：

Exception in thread "main" java.util.InputMismatchException

at java.base/java.util.Scanner.throwFor(Scanner.java:939)

at java.base/java.util.Scanner.next(Scanner.java:1594)

at java.base/java.util.Scanner.nextInt(Scanner.java:2258)

at java.base/java.util.Scanner.nextInt(Scanner.java:2212)

at com.raghuvamsha.Main.main(Main.java:24)

在我的程序中： 1. 主类。

import java.util.Scanner;

public class Main {

public static void main(String[] args) {

    // write your code here

    // Using Scanner for Getting Input from User

    System.out.println("\tMAIN MENU:\n" +

            "\t\t1) Add new member record\n" +

            "\t\t2) Modify existing member record\n" +

            "\t\t3) Delete member record\n" +

            "\t\t4) Display all member records\n" +

            "\t\t5) Search for a particular member record\n" +

            "\t\t6) Exit");

    int a = 0;

    while(a!=6) {

        Scanner reader = new Scanner(System.in);

        a = reader.nextInt();

        System.out.println("You entered integer " + a);

        if(a==1){

            AddNewMember anm = new AddNewMember();

            anm.openFile();

            anm.addRecords();

            anm.closeFile();

        }

    }

   }

}