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Java Programming - Garbage Collections - Discussion

Discussion Forum : Garbage Collections - General Questions (Q.No. 4)
Garbage Collections
4.
class Test 
{  
    private Demo d; 
    void start() 
    {  
        d = new Demo(); 
        this.takeDemo(d); /* Line 7 */
    } /* Line 8 */
    void takeDemo(Demo demo) 
    { 
        demo = null;  
        demo = new Demo(); 
    } 
}
When is the Demo object eligible for garbage collection?
After line 7
After line 8
After the start() method completes
When the instance running this code is made eligible for garbage collection.
Answer: Option
Explanation:

Option D is correct. By a process of elimination.

Option A is wrong. The variable d is a member of the Test class and is never directly set to null.

Option B is wrong. A copy of the variable d is set to null and not the actual variable d.

Option C is wrong. The variable d exists outside the start() method (it is a class member). So, when the start() method finishes the variable d still holds a reference.

Discussion:
12 comments Page 2 of 2.
Rahman said:   3 years ago
How option D is correct? Please explain me.
Uwe said:   8 years ago
I too have the same doubt @Flashy.
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