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?
Answers were Sorted based on User's Feedback
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 |
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 |
What is the integer of 16?
What is singleton class in java and how can we make a class singleton?
What is thread pool in java with example?
What are keywords give examples?
Can we override private constructor in java?
What is meant by throwing an Exception?
what methods would you overwrite in java.lang.object class?
Can we instantiate Interfaces?
What is the purpose of garbage collection in java?
How to retrieve data from database in java using arraylist?
what is check p object in java
What are event-delegation model and event-inheritance model? Which is best?