No I wanted to use a method  from ArrayList and I am now using this:

accountList.lastIndexOf(newAccount)

because the accounts are added to the ArrayList dynamically at the
end of the list. If your interested in the code find it here:

http://www.reynolddemarcojr.com/Bank.java
http://www.reynolddemarcojr.com/BankAccount.java
http://www.reynolddemarcojr.com/Terminal.java