Java Programming

As per the documentation :

In some of Sun's implementations of the Java virtual machine, a reference to a class instance is a pointer to a handle that is itself a pair of pointers:

one to a table containing the methods of the object and

a pointer to the Class object that represents the type of the object, and

the other to the memory allocated from the heap for the object data.

So given,  two classes A and B as follows :

class A{  
   void m1(){  
   System.out.println(" from m1 method ");  
   }  
}  
  
class B extends A {  
   void m2(){  
   System.out.println(" from m2 method ");  
   }  
}  

In main method I make following objects, what will their bit pattern refer to? I have commented my understanding, correct me if I am wrong.

A a1 = new A();

// a pointer to dispatch table of a1 contains only method m1.

// a pointer to the memory allocated from the heap for the object data.

// a pointer to Class class object of A



B b1 = new B();

// pointer to dispatch table of b1 contains method m1 and m2.


// a pointer to the memory allocated from the heap for the object data.

// a pointer to Class class object of B


A a2 = new B();

// What will the dispatch table of a2 be?

// a pointer to the memory allocated from the heap for the object data.

           // Which Class class object will it point, A or B ?

Thanks in advance.