Garbage Collections - Java Programming Questions and Answers

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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?

just after line 5

just after line 6

just after line 7

just after line 8

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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