#56 Dynamic Method Dispatch in Java

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in this video we are discussing method dispatch

-- in previous lecture we had discussed what is polymorphism
-- in this lecture we are further talking about run time polymorphism
-- suppose we have some class A , B and C
-- class B and C extends A
-- in All three class we have show() method
-- main() method of Demo we create object of A, B and C but we create only reference of A which can hold
object of A, B and C .
class A{
public void show(){
}
}
class B extends A{
public void show(){
}
}

class C extends A{
public void show(){
}
}

public class Demo{
public static void main(String []args){
A obj =new A();

obj =new B(); //reference is A (we can use reference of parents) and create object of B and assign to parents reference variable.

obj =new B(); //reference is A (we can use reference of parents) and create object of C and assign to parents reference variable.


}
}

Note: during compile time we donot which show() method is called from which class.
-- we can know during run time which show method is called this is known as run time polymorphism.
-- all this concept is class dynamic method dispatch

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[onlysubscriptions]

Dynamic method dispatch is the mechanism by which the call to an overridden method is resolved at runtime rather than compile-time. This occurs when a superclass reference variable is used to refer to a subclass object, and the overridden method is called on that reference. The method to be executed is determined based on the actual object's type, not the reference variable's type.

[kilvish]

You said we don't know at the compile time which method will be called, But we know right, the method inside the class whose object is actually created, will be executed. So how exactly is this run time polymorphism.

[bhabagrahibarik]

The best explaination ever in few minutes. Thanku sir for the best explanation.

[mackensonreginaldmichel]

Very interesting. Thank you very much. I'd like to know now: what element is polymorphic now: the variable obj? The method show()? The type? The Object?

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[shreedharmakr]

Lets say there is a class A and class B (without inheritance), so to create objects we say { A obj = new A(); B obj2 = new B() }, now obj and obj2 are variables referring to objects (but what it actually holds is an address location), does it mean different classes have different type of address location?

[chakkers]

Sir will this work if B extends A and C extends B. Is it possible to call show method of class A from C

[sreeramv]

Then what is the difference between function overriding and polymorphism sir?

[agariogg]

Excellent explanation, I just noticed you look a little bit like Nacho from Better Call Saul :)

[KishoreSumanjigari-jy]

When i give method name as show1() in class B and method name as show2() in class C and when I create object for B and and try to access the particular methods of particular classes it is not working. but it is working only when all the method names in all classes is show(). this is how i called method in B class
obj=new B();
obj.show1();
@Telusko Please give me clarity on this, I was bit confused