Discussion
void start() {
A a = new A();
B b = new B();
a.s(b);
b = null; /* Line 5 */
a = null; /* Line 6 */
System.out.println("start completed"); /* Line 7 */
}
When is the B object, created in line 3, eligible for garbage collection?
Answer: D
Correct answer: There is no way to be absolutely certain.
The trap is a.s(b). Nothing in the fragment says what that method did with the reference - it may have stored it in a field of a, in a static field, or in a collection reachable from elsewhere. Setting the two local variables to null removes the local references only, and without seeing s no conclusion about reachability can be drawn.
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