After line 11 runs, how many objects are eligible for garbage collection? class X2
{
public X2 x;
public static void main(String [] args)
{
X2 x2 = new X2(); /* Line 6 */
X2 x3 = new X2(); /* Line 7 */
…

Question

After line 11 runs, how many objects are eligible for garbage collection? class X2 
{
    public X2 x;
    public static void main(String [] args) 
    {
        X2 x2 = new X2();  /* Line 6 */
        X2 x3 = new X2();  /* Line 7 */
        …

Accepted Answer

This is an example of the islands of isolated objects. By the time line 11 has run, the objects instantiated in lines 6 and 7 are referring to each other, but no live thread can reach either of them.

After line 11 runs, how many objects are eligible for garbage collection? class X2 { public X2 x; public static void main(String [] args) { X2 x2 = new X2(); /* Line 6 / X2 x3 = new X2(); / Line 7 / x2.x = x3; x3.x = x2; x2 = new X2(); x3 = x2; / Line 11 */ doComplexStuff(); } }

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Discussion & Comments

After line 11 runs, how many objects are eligible for garbage collection? class X2 { public X2 x; public static void main(String [] args) { X2 x2 = new X2(); /* Line 6 */ X2 x3 = new X2(); /* Line 7 */ x2.x = x3; x3.x = x2; x2 = new X2(); x3 = x2; /* Line 11 */ doComplexStuff(); } }

More Questions from Garbage Collections

Discussion & Comments

After line 11 runs, how many objects are eligible for garbage collection? class X2 { public X2 x; public static void main(String [] args) { X2 x2 = new X2(); /* Line 6 / X2 x3 = new X2(); / Line 7 / x2.x = x3; x3.x = x2; x2 = new X2(); x3 = x2; / Line 11 */ doComplexStuff(); } }