class A { // some code here} class B { // some code here}class Ex {public static void main(string args[]) {A a=new B();B b=new A();a.add();b.add();}Will this program run? Explain the referencing the object instances. What is the result;

craig.cattell

 Profile Answers by craig.cattell Questions by craig.cattell

• Jan 15th, 2008

No it will not compile - as A does not extend B nor vice-versa when you try to assign an object of type B to a reference of type A (and vice-versa) you will get an 'Incompatible type' error me...

foiaz

 Profile Answers by foiaz Questions by foiaz

• Dec 27th, 2007

Yes, this program will execute. Reference variables a and b holds the object instance of Class B and Class A respectively. i.e it points to the memory locations of those objects.a.add() will call the add() method of Class B. and b.add() will call the add() method of Class A.

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