In Java, every class that you create is derived from the Object class.
The Object class defines the toString() method. Until overridden, the toString method will return the hashCode for your object.
In your case, you need to override the base (Object) class' toString() method inside your Bank class.
In most instances, the toString() method inside your class will return a String representation of your object.
For instance, if you had a class called Closet that kept track of the number of shirts and pants that was in it, your toString() method might look something like this: