I believe this is the solution of your Professor. He used division and modulo operator. Division by 10 in an integer and assign it within itself will remove its last digit + doing modulo operator by 10 will get the last digit.
import java.util.Scanner;
public class Main{
public static void...
package com.bankingsys;
import com.bankingsys.BankingSystem;
import java.util.Scanner;
public class BankingSystem{
public static String username[]= {"hakdog","lloyd","dekudeku"};
public static String password[]={"lloydkun","samson","deku"};
public static String...