Assume that the Measurable interface is defined with a static sum method that computes the sum of the Measurable objects passed in as an array, and that BankAccount implements the Measurable interface.Also assume that there is a variable branchAccounts that is an object reference to a populated array of BankAccount objects for a bank branch.Which of the following represents a correct invocation of the sum method to find the total balance of all accounts at the branch?
A)Arrays.sum(branchAccounts)
B)BankAccount.sum(branchAccounts)
C)Measurable.sum(branchAccounts)
D)branchAccounts.sum()

Question

Quizplus · Accepted Answer

The sum method is defined in the Measurable interface, so it can only be directly invoked on a Measurable object or class. Therefore, option C is the correct choice as it directly calls the sum method on the Measurable interface and passes in the branchAccounts array of BankAccount objects. Options A and B are incorrect as they do not reference the Measurable interface or its sum method, while option D is incorrect as it attempts to call a non-existent instance method on the branchAccounts array.

Assume That the Measurable Interface Is Defined with a Static