Assume that BankAccount is a predefined class and that the declaration BankAccount[ ] firstEmpireBank; has already been performed. Then the following instruction reserves memory space for firstEmpireBank = new BankAccount[1000];
A) a reference variable to the memory that stores all 1000 BankAccount entries
B) 1000 reference variables, each of which point to a single BankAccount entry
C) a single BankAccount entry
D) 1000 BankAccount entries
E) 1000 reference variables and 1000 BankAccount entries

Question

Quizplus · Accepted Answer

B) The declaration BankAccount[ ] firstEmpireBank; reserves memory space for firstEmpireBank, which itself is a reference variable that points to the BankAccount[ ] object. The statement firstEmpireBank = new BankAccount[1000]; instantiates the BankAccount[ ] object to be 1000 BankAccount objects. This means that firstEmpireBank[0] and firstEmpireBank[1] and firstEmpireBank[999] are all now legal references, each of which is a reference variable since each references a BankAccount object. So, the statement reserves memory space for 1000 reference variables. Note that none of the 1000 BankAccount objects are yet instantiated, so no memory has been set aside yet for any of the actual BankAccount objects.

Assume That BankAccount Is a Predefined Class and That the Declaration