Question 5

Given: class Fizz { int x = 5; public static void main(String[] args) { final Fizz f1 = new Fizz(); Fizz f2 = new Fizz(); Fizz f3 = FizzSwitch(f1,f2); System.out.println((f1 == f3) + " " + (f1.x == f3.x)); } static Fizz FizzSwitch(Fizz x, Fizz y) { final Fizz z = x; z.x = 6; return z; } }

What is the result?

A. true true

B. false true

C. true false

D. false false

E. Compilation fails

F. An exception is thrown at runtime

Answer :

A is correct. The references f1, z, and f3 all refer to the same instance of Fizz. The final modifier assures that a reference variable cannot be referred to a different object, but final doesn't keep the object's state from changing. B, C, D, E, and F are incorrect based on the above. (OCA Objective 2.2)

Required:

please explain why the answer is correct and why not ? please explain