Calling Runtime.gc() will cause eligible objects to be garbage collected.
B.
The garbage collector uses a mark and sweep algorithm.
C.
If an object can be accessed from a live thread, it can't be garbage collected.
D.
If object 1 refers to object 2, then object 2 can't be garbage collected.
Answer and Explanation
Answer:If an object can be accessed from a live thread, it can't be garbage collected.
Explanation: This is a great way to think about when objects can be garbage collected. Option A and B assume guarantees that the garbage collector never makes. Option D is wrong because of the now famous islands of isolation scenario.
