SCJP - 25 -Given Example

When // doStuff is reached, how many objects are eligible for GC?
A. 0
B. 1

C. 2
D. Compilation fails.
E. It is not possible to know.
F. An exception is thrown at runtime.

Answer:

C is correct. Only one CardBoard object (c1) is eligible, but it has an associated Short
wrapper object that is also eligible.

A, B, D, E, and F are incorrect based on the above. (Objective 7.4)
==

class CardBoard {
Short story = 5;
CardBoard go(CardBoard cb) {
cb = null;
return cb;
}
public static void main(String[] args) {
CardBoard c1 = new CardBoard();
CardBoard c2 = new CardBoard();
CardBoard c3 = c1.go(c2);
c1 = null;
// do Stuff
} }