Bank, Tester class (main)

package Tester;

import java.time.LocalDate;
import java.util.Random;

import BankAccounts.Account;
import BankAccounts.LoanableAccount;
import BankPkg.AccountType;
import BankPkg.Bank;

public class Tester {
    static Random rnd = new Random();
    static AccountType[] typesArray = AccountType.values();
    static Bank myBank = new Bank();

    public static void CreateAccounts(Bank aBank, int n) {
        for (int i = 1; i <= n; i += 1) {
            int personId;

            boolean clientCreated = false;
            do {
                System.out.println("trying to create a new account!");
                String personName = "Name" + (char) (60 + rnd.nextInt(35));
                personId = 10000000 + rnd.nextInt(900000000);
                LocalDate birthDate = LocalDate.of(1988 + rnd.nextInt(18),
                        1 + rnd.nextInt(12), 1 + rnd.nextInt(28));

                clientCreated = aBank
                        .addClient(personName, personId, birthDate);
            } while (!clientCreated);

            int accountNo;
            AccountType type;
            do {
                type = typesArray[rnd.nextInt(typesArray.length)];
                accountNo = aBank.addAccount(personId, type);
            } while (accountNo == -1);

            System.out.printf("new account created (%d of %d)\n", i, n);
        }
    }

    public static void printStat() {
        System.out.println("Number of accounts from each type:");
        for (AccountType item : typesArray) {
            System.out.printf("%3d of type %s\n",
                    Account.getTypeAccountsCounter(item), item.name());
        }
    }

    public static void printAccountsList(String title, Account[] accountList) {
        System.out.println(title);

        for (Account item : accountList) {
            System.out.println(item);
        }

    }

    public static void main(String[] args) {

        CreateAccounts(myBank, 10);

        printStat();

        Account[] studentsAccounts = myBank
                .getAccountsByType(AccountType.student);
        printAccountsList("accounts of type student", studentsAccounts);

        for (Account item : myBank.getAccounts()) {
            myBank.withdraw(item.getAccountId(), 4000);
            if (item instanceof LoanableAccount) {
                myBank.giveLoan(item.getAccountId(), 18000, 36);
            }
        }
        printAccountsList("all Bank account", myBank.getAccounts());

        Account[] invalid2020 = myBank.getInvalidAgeAccounts(LocalDate.of(2018,
                12, 31));
        printAccountsList("Invalid Accounts at 1/1/2020", invalid2020);

        System.out.println(myBank.getClients("fsdfs"));

        for (Account item : myBank.getAccounts()) {
            if (item instanceof LoanableAccount) {
                myBank.loanPaymentReturn(item.getAccountId());
            }
        }
        printAccountsList("all Bank account", myBank.getAccounts());

    }
}