APCSA Java Questions

Question

Which of the following statements is most accurate? Explain.

 

  A. A reference variable is an object.

  B. A reference variable refers to an object.

  C. An object may contain other objects.

  D. An object may contain the references of other objects.

Which line of code is part of the private implementation of a BankAccount class? Explain.

a. public BankAccount()

b. balance = balance - amount;

c. public void deposit(double amount)

d. public void withdraw(double amount)

Answer 1

B is completely accurate.

A is not true; reference is a primitive type, not an object.

C is not true; nothing in Java can contain an object in the sense of other languages like C++.

D would be true if it were rephrased "An object may contain references to other objects."

Only b. could be part of a private implementation.

Everything else is declared public.