#6.5 Java Tutorial | Dynamic Method Dispatch

In this lecture we are discussing:
1)Loose coupling (Dynamic method dispatch)
2)compile time polymorphism vs runtime polymorphism
3)Benefits of Dynamic method dispatch

#1
loose coupling - using parents type reference and child type object.

Suppose we have three Class A,B and C here B and C are child of A.
in A there are show() method and both class B and c override show() method.

class Main {
public static void main(){
//link this at run time
A obj1 =new B(); //loose coupling
obj1 =new B(); //Dynamic method Dispatch
}
}

class A{
}

class B extends A{
}

class C extends A{
}

Since, during runtime show() method get selected for execution and every time we changing object and therefore method get changed at runtime this is known as dynamic method dispatch.

#2
:-- method overloading is compile time polymorphism, because linking of method get happen during compile time with object.
:-- method overriding is run time polymorphism because linking of method occur during runtime.

#3
benefit of loose coupling:

:--During enterprise level software we are working with loose coupling that time dynamic method dispatch really helpful.
:--Loose coupling allows making changes in the code easily.
:--Testing of loosely coupled structures is easier than the tightly coupled structure.
:--Less amount of code is required to make changes in a loosely coupled structure than in a tightly coupled structure.

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[champ]

I m just loving your course i have no prior knowledge about programming but i got every concept very clearly ..

[mordecai]

Your video on Java Garbage Collection helped me on my midterm, now here I am for more help with my assignments! Than you

[ashishgarg]

you're great sir.. please start making videos on something called LECTURE ON DEMAND. where we can put our doubt and get the lecture on that particular topic. that's it :)

[natannegara]

Hi, I'd like your explanation in this video, but my questions is how if I'd like to access the "config method" at 2:13 . I'm just curious about that because you're just skiping this part. Hope you'll answer my questions.

[AshAkash]

What is the advantage of using Dynamic Method Dispatch?

[anketlale]

love your videos sir...
keep making this videos...
java series is just awesome...
#motivation

[pranitachikorde]

Hello Sir,
What is need of Dynamic Method Dispatch? In which situation we can use it

[aadershchaubey]

3:37 sir, if reference will be linked with object at runtime then why sometimes it shows compile time error in that line (whenever we try to link reference with inappropriate object).

[friendsfandom]

Sir u first said since we are creating object of b the methods in b only can be executed
Later when u implemented method config() u said it'll create an error due to method not available in class a. My doubt is we are not created object of class 'a' so can we go for methods in "a"

[lastwish]

Explanation :-
class a
class b extends a

a obj = new b();
now all the class a methods can be accessed, but while executing if there is any method which is held on class b (overridden), then it executes class b methods,
note :- if there is a method which is not there in class a and held in class b, then it wont execute, becz here reference only with class a .

[Abhishek-troi]

What is the real application of this in projects? By the way very well explained.👍

[rajashribanerjee]

Is dynamic method dispatch & dynamic method lookup same?

[MuhammadWaseem-mjge]

Great video thank you so much. But i have a confusion please reply me as soon as possible.
I wanna know that if we have
A obj1 = new B();
And we call obj1.show() then it will run child method or B class method as every function instead final or static functions is virtual fuction in java by default so instead of running parent fuction it will run child. But what if i want to run parent show function instead of child keeping the use case as it is i.e A obj1 = new B();
Obj1.show() // it should run parent show instead of child. How can i do so

[anuragchaturvedi]

SIR I HAVE A DOUBT



WHAT IS NAME OF BACKGROUND MUSIC

[ArkoSarkar]

If it was A obj1 = new A(); the link here is done at compile or run time?
And does dynamic method dispatch mean calling the new reference variable's method where the reference variable's(obj1) object of a different reference type or class(A) has been moved from B to C?

[nadaayahya]

Hi Mr navin
I like your way of teaching
I want to build programme like talking tom.
What I should learn to achieve this goal?
Please tell me the steps I need to do it
With my regards.

[alapatisrikanth]

So which show method executed will decided at run time. But everytime u perform runtime polymorphism it always executes sub class methods only why not super class methods??.

[rakeshkumarparida]

Can anyone tell me what is the use of it nd why do we use it ?

[MrAbbie]

Teach about upcasting and downcasting it is so confusing for

[The_Bitter_Truth]

can we override a static method, and why?