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Discussion :: Garbage Collections

  1. class Bar { } 
class Test 
{  
    Bar doBar() 
    {
        Bar b = new Bar(); /* Line 6 */
        return b; /* Line 7 */
    } 
    public static void main (String args[]) 
    { 
        Test t = new Test();  /* Line 11 */
        Bar newBar = t.doBar();  /* Line 12 */
        System.out.println("newBar"); 
        newBar = new Bar(); /* Line 14 */
        System.out.println("finishing"); /* Line 15 */
    } 
}
    At what point is the Bar object, created on line 6, eligible for garbage collection?

    2. A.

    after line 12
    B.

    after line 14
    C.

    after line 7, when doBar() completes
    D.

    after line 15, when main() completes

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    Answer : Option B

    Explanation :

    Option B is correct. All references to the Bar object created on line 6 are destroyed when a new reference to a new Bar object is assigned to the variable newBar on line 14. Therefore the Bar object, created on line 6, is eligible for garbage collection after line 14.

    Option A is wrong. This actually protects the object from garbage collection.

    Option C is wrong. Because the reference in the doBar() method is returned on line 7 and is stored in newBar on line 12. This preserver the object created on line 6.

    Option D is wrong. Not applicable because the object is eligible for garbage collection after line 14.

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