Garbage Collection Questions

[peter kosmas]

Hello tomorrow is the Big day ...
I give the exam
one last point to review is that am not still sure that i can get right the garbage collection questions
.. So please can someone show me the way i can write diagrams for such questions ?
i would like to print it and just read it in the morning when i have coffee .(Like a newsPaper )
)))
now i will try to have some fun so tomorrow i will go more calm for the Exam.

[David Marco]

class A {
	Object obj1 = new Object();  //  #1
	Object obj2 = new Object();  //  #2
	
	obj1 = obj2  //  #3
	
	Object obj3 = new Object();  //  #4
	obj3 = null;  //  #5
	System.gc();
}

Every time your code calls "new ..." write the reference variable name outside the heap, draw the object created (a square for instance) inside the heap, and link up both elements with an arrow. When a reference variable changes, write a new arrow from this reference variable to the new target, and CROSS OFF the original reference variable arrow. At the time to call System.gc(), those objects crossed off are unreachable (unaccessible from a live thread) and so eligible for garbage collection. Be care with more complex objects which might contain inner references to either other references or new objects. The key point is draw arrows from references to their respective objects and removes (crossing off) when references changes.

I hope this helps.

[peter kosmas]

Thanks a lot... It will indeed help ...