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Discussion :: Garbage Collections

  1. public class X

    {

       public static void main(String [] args)

       {     

          X x = new X();

          X x2 = m1(x); /* Line 6 */

          X x4 = new X();

          x2 = x4; /* Line 8 */

          doComplexStuff();

      }

      static X m1(X mx)

      {

        mx = new X();

        return mx;

     }

    }

    After line 8 runs. how many objects are eligible for garbage collection?

    2. A.

    0  
    B.

    1
    C.

    2
    D.

    3

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    Answer : Option B

    Explanation :

    By the time line 8 has run, the only object without a reference is the one generated as a result of line 6. Remember that "Java is pass by value," so the reference variable x is not affected by the m1() method.

    Ref: http://www.javaworld.com/javaworld/javaqa/2000-05/03-qa-0526-pass.html

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