Interview question: Objects eligible for garbage collection

Question

Give the following code:

class A {
    Boolean b;
    A easyMethod(A a){
        a = null;
        return a;
    }
    public static void main(String [] args         


        

Answer 1

Can you please me explain me why a2 and a3 aren't being garbage collected ?

Because a2 and a3 are not objects. They are variables. Variables are not collectable for the simple reason that they are not allocatable.