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Discussion :: Garbage Collections

  1. 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(); 
    } 
}
    2. A.

    After line 7
    B.

    After line 8
    C.

    After the start() method completes
    D.

    When the instance running this code is made eligible for garbage collection.

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    Answer : Option D

    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.

     

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