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Discussion :: Garbage Collections

  1. public Object m()  {       Object o = new Float(3.14F);      Object [] oa = new Object[l];     oa[0] = o; /* Line 5 */     o = null;  /* Line 6 */     oa[0] = null; /* Line 7 */     return o; /* Line 8 */ }
    When is the Float object, created in line 3, eligible for garbage collection?

    2. A.
    just after line 5
    B.
    just after line 6
    C.
    just after line 7
    D.
    just after line 8

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    Answer : Option C

    Explanation :

    Option A is wrong. This simply copies the object reference into the array.

    Option B is wrong. The reference o is set to null, but, oa[0] still maintains the reference to the Float object.

    Option C is correct. The thread of execution will then not have access to the object.

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