Garbage Collections

Q1:
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?

A 2

B 1

C 3

D 0

ANS:A - 0

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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