Java OCA OCP Practice Question 479

Question

At which line in the following code is the Vector object, created in line 4, first subject to garbage collection?

1. import java.util.*;  
2. public class Main {  
3.  public static void main(String[] args) {  
4.   Vector v1 = new Vector();  
5.   Vector v2 = new Vector();  
6.   v1 = null;  //from w w  w . j a va2  s.co  m
7.   Vector v3 = v1;  
8.   v1 = v2;  
9.   v1.add("This");  
10.  v1.add(v2);  
11.  String s = (String) v1.elementAt(0);  
12.  v1 = v2;  
13.  v2 = v1;  
14.  v1.add(s);  
15. }  
}

A. Line 6
B. Line 7
C. Line 8
D. Line 12

A.

Note

In line 6, the null value is assigned to the v1 variable.

This causes the object created in line 4 to become unreachable.

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