Java开发网 - A Question: (garbage collection)

Topic: A Question: (garbage collection)

1.A Question: (garbage collection)

Posted by: aleel_008
Posted on: 2004-10-03 10:44

class Demo {
  private Demo d;
  void start() {
    d = new Demo();
//    d.takeDemo(d);

  }

  void takeDemo(Demo demo) {
    demo = null;
    demo = new Demo();
  }
}
When is the Demo object created on line 3,eligible for garbage collection?
A.After line 5
B.After line 9
C After the start method completes
D When the takeDemo method completes
E.When the instance running this code is made is made eligible for garbage collecction
the answer is E.why B is incorrect and E is correct?

2.Re:A Question: [Re: aleel_008]	Copy to clipboard
Posted by: elysium922 Posted on: 2004-10-03 11:46 It would be much easier for people to understand the question if you had indended the code properly with appropriate line numbers. Anyway, since you have commented out the call to takeDemo, I don't see any reason why E wouldn't be the answer.

3.Re:A Question: [Re: aleel_008]	Copy to clipboard
Posted by: aleel_008 Posted on: 2004-10-03 12:24 I know the choiceE is correct ,but why is the choice B wrong?