Another Exercise regarding Garbage Collection:

[Thomas Markl]

Float f = new Float(3.5f);
Float f = new Float(3.0f);
f = null;
f= null;
When is object referenced f eligable for g.c?
How many objects are eligable for g.c.
I think there are 2 objects eligable for g.c.
First the Float(3.5f) and then the last reference
Of f which is Float(3.0f).
Is that correct? What is the earliest point when
f is eligable for g.c. is it line 3?
Appreciate your answers.
Thomas

[Blake Minghelli]

Do you mean to name your references as f1 and f2... you have them both named as f???

[Thomas Markl]

The references are both "f" in this question.

[Blake Minghelli]

Float f = new Float(3.5f);
Float f = new Float(3.0f);
f = null;
f= null;

Ok, just trying to make sure I understand. Since you can't declare the same variable twice, I think you mean...

 
1. // Initial assignment
2. Float f = new Float(3.5f);
3. // new assignment
4. f = new Float(3.0f);
5. f = null; 

Is that correct? If so, then I believe your first object (3.5) is eligible for gc at line 4, and your second object (3.0) is eligible at line 5.

[Dirk Schreckmann]

The references are both "f" in this question.
As Blake implied, such a program fragment would produce a compile-time error.
Where did you find this example?