1.IN CASE OF DYNAMIC METHOD DISPATCH WHY WE USE REFERENCE VARIABLE,WE CAN USE T

1.IN CASE OF DYNAMIC METHOD DISPATCH WHY WE USE REFERENCE
VARIABLE,WE CAN USE THE DIFFERENT DEFINED OBJECT DIRECTLY TO
ACCESS THE DATA MEMBER AND MEMBER FUNCTION OF THAT
RESPECTIVE CLASS?WHAT IS THE MAIN FUNCTION OF "REFERENCE
VARIABLE" HERE?

Question Posted / rakesh

2 Answers
4836 Views
TCS, I also Faced
E-Mail Answers

Answers were Sorted based on User's Feedback

1.IN CASE OF DYNAMIC METHOD DISPATCH WHY WE USE REFERENCE VARIABLE,WE CAN USE THE DIFFERENT DEFINED..

Answer / vijay kumar

In case of dynamic method dispatch, It restricts from being used to call methods of other class. You cannot call overriden method which is not declared in reference variable class..
This is the main reason why we use reference variable here in dynamic polymorphism.

Hope i answer this question.

Is This Answer Correct ?

3 Yes

0 No

1.IN CASE OF DYNAMIC METHOD DISPATCH WHY WE USE REFERENCE VARIABLE,WE CAN USE THE DIFFERENT DEFINED..

Answer / shweta kunjadia

It shows Runtime Polymorphism

Eg.

class A {
void callme() {
System.out.println("Inside A's callme method");
}
}

class B extends A {
void callme() {
System.out.println("Inside B's callme method");
}
}

class C extends A {
void callme() {
System.out.println("Inside C's callme method");
}
}

class Dispatch {
public static void main(String args[]) {
A a = new A(); // object of type A
B b = new B(); // object of type B
C c = new C(); // object of type C
A r; // obtain a reference of type A

r = a; // r refers to an A object
r.callme(); // calls A's version of callme

r = b; // r refers to a B object
r.callme(); // calls B's version of callme

r = c; // r refers to a C object
r.callme(); // calls C's version of callme
}
}

Is This Answer Correct ?

3 Yes

1 No

Post New Answer