8.17 Abstract Class in Java Tutorial Theory

[@MrTonyfish123]

Sir, just came here from the old video on this topic and I just wanted to say that this video is so much better. The audio and video are much clearer and the video is much easier to follow. Thank you so much for the continued improvement!

[@juniadj.8050]

at 8:17 outstanding example..so finally I am able to understand abstract class

[@saby8765]

Absolutely hilarious requirements description, but conceptually it is spot on. very good.

[@muleytanushri7262]

Excellent explanation!! I always like the way you teach. Thankyou soooo much Navin Sir for uploading your awesome videos.

[@nurizzatikhairunnisabtabus2414]

THANK YOUUUUUU, I LOVE IT !!! EXCELLENT EXPLANATION !!

[@Kanth33]

Very well defined, please continue to give practical examples with the added visual cues. Great Job!!!

[@micky992]

Instead of Suresh Ramesh confusion, could have done with A, B and C which clicks quickly to a user.

[@divyeshkumarbalar7732]

seems like Navin is a big fan of 5Star chocolate

[@rohitsoni9325]

Nice Explaination Sir... And Pooja Ashra is also doing great work... These edited videos are way better than previous ones... Keep Going... :)

[@poojaashra7404]

ThankYou soo much

[@harshsharma-nm4lf]

who are u

[@games_hub2960]

i understood the whole concept in much lesser time than understanding the concept in 1 hr thanks

[@juliet5446]

You make everything easy. Thank you for all you do.

[@SAKSHIKUMARIP]

This is jst mindblowing sir..tqq for such a clear explanation..

[@ashishtayade047]

Thank you sir very nice gide & very nice best information abstract class teaching video.👍

[@RiteshKumar-ri1xq]

Excellent explanation. Big Thumps Up from me.

[@SmartProgramming]

really love to see your tutorials, always helpful, thank you 👌👌👌🙂🙂🙂🙂

[@ReenaSharma-wu8ky]

Is it worth it to learn from these tutorials in 2020? btw videos are great!!

[@tejassingh9127]

yes i am learning in 2021 even have 3 years of project experience with java. The concepts explained best in these lectures as compared to any other channel on whole youtube.

[@itsme4unas]

One of the best videos.. quality excellent

[@robertocosciaofficial]

thank you very much for the tutorial. Was really useful to understand the abstract class and methods

[@soumiparali6285]

Sir you just make things so easy. Just so so goooooddd!!! Sir please help in data structure and algorithm pleaseeeee

[@sathishkumarr7106]

Great finishing 🤩🥳

[@sijiponnachan8879]

Thank you so much sir, nice explanation........no words to say, its awesome

[@abdussamed107]

why is it neccessary to use the word abstract anyway? cant i not just extend the iphone,htc,and samsung classes by the class phone and get the same advantage of putting which parameter i want into the show function???

[@ashrafulalam3662]

8:13 The exact moment my mind was blown

[@jaypawar7316]

Nice video. With good presentation

[@vaishnavinair1838]

Amazing Explanation..................

[@643kanavguleria9]

the feature he is talking about at 2:47 is now available in MI phones .

[@sriramakrishna7188]

I like ur explanation sir.😃.....and ...some times it makes me confuse .😮..

[@aruntripathi4537]

I appreciate your work great explanation !!

[@Jeetu0301]

I feel the direction of arrows should be opposite. Correct me if I am wrong ? 6:16

[@iconiczElite]

Arrow mark is pointing towards which class its extending

[@VijayrahulRaja]

Thank you sir. Excellent explanation.

[@ArunKumar-vi5ed]

excellent explanation sir.

[@meetamin7343]

This is awesome❤❤

[@akashmuntode8547]

Thanks sir, for making this video

[@lionciomorcilla4743]

Very nice teacher!!!

[@vladanulardzic5859]

Well done ! Keep on ....

[@bass9454]

love your videos

[@ExplorerJoe91]

In abstract class program is it compulsory to import any package??

[@captainop3810]

Sir, what is the difference between inheritance and abstract class?

[@mojaffaransari8768]

The new feature of a phone, to cook like a microwave it's really funny .......

[@lionciomorcilla4743]

Thank you so much. Keep it up and help us(:

[@nirmal2979]

Any examples of abstract class without any abstract method???

[@vishnuramj4660]

At the last example it even though works on normal class?

[@nihardesai9813]

If I pass my university exams at the University of Twente in the netherlands which provides international teaching. The credit solely goes to you and not my university

[@divyeshkumarbalar7732]

What can be the characteristic of private static inner class having private methods....?

[@mohanrammanikandan7939]

Hi, Navin. Thanks for the explanation. But I have a doubt here. Please help to understand. When you want to add some new features, you can do it by inheritance concept, right ? Why do we even go for "abstract" ? Because, in your above example, "iphone extends phone" and "Samsung extends phone" could have been done without abstract, right ?

[@visheshpahuja2]

If phone class was simply inherited,you would have to make different show methods which would accept the respective objects of Samsung,Iphone classes as parameters...here by making Phone as abstract ...show method will accept the objects of both Samsung/IPhone.....in future when you have many classes inheriting the Phone class...this will help reducing the lines of code by using a single/generic show method for all due to abstraction

[@visheshpahuja2]

Second reason for abstraction = each class extending phone class can now have their own definition of showConfig method...so showConfig of Phone class will not be of any use and can be made abstract through this concept...each phone has a different configuration !

[@sherothkar5809]

start==super; finish==super;

[@OasisFinder]

i have one doubt even a single method is abstract so its compulsory to make whole class abstract .

[@monaliparihar5138]

Where to use abstract class and where to use interface ? Apart from that multiple inheritance not support it we extend abstract class ... Is there any another reason

[@gggg12]

sir @.7.52 in left hand side it says show(new Iphone()) ; what this measn? creating an object ? I create object like this iphone obj =new iphone(); In static show method in the top left there a parameter iphone obj whats that?

[@pavel9235]

show(new Iphone()); is absolutely the same as: Iphone A = new Iphone(); a.show();

[@razaakmal7423]

Sir If there Is a Base Class A and B extends A and there is another class C which extends B So the Methods in A will also be presented in C?

[@vedantjoshi1487]

yes! but it must be a public method.....this concept is called multi level inheritence! sir has a video on it...^_^

[@vishnuramj4660]

It's same as polymorphism?

[@hanannur5133]

i want the phone which acts like microwave tho hahaha what an example

[@psycho_gaming2422]

Sir why to make a object of abstract class as we can use the object of child class ...why referencing????

[@harshsharma-nm4lf]

nice u are asking us to share on our channel or what?its not a rught thing to do right?

[@mundlajoshiram8669]

In abstract class I have a error why java.util.*; import java.lang.*; import java.io.*; /* Name of the class has to be "Main" only if the class is public. */ public class abDemo { public static void main (String[] args) throws util.java.lang { Maheshphone Obj = new Joshihphone(); Obj.call(); Obj.move(); Obj.operate(); Obj.charge(); } } abstract class maheshphone{ public void (call) { System.out.println("calling..."); } abstract void move(); abstract void operate(); abstract void charge(); } } abstract class Ramuphone extends maheshphone { public void move(); { System.out.println("moving...."); } } class Joshiphone extends Ramuphone { public void operate(); { System.out.println("operate...."); charge(); { System.out.println("charge...."); } }

[@wilburtmoreno469]

on my netbeans, i need to input abstract in every sub class or else it will count as error. is that normal?

[@sachinlambrud3031]

If we join this channel ..What will be use of that

[@antimac9683]

thank you bro.

[@dominicxavier5274]

Sir I still don't understand what is the diff b/w inheritance and abstract. Where do we use abstract and where do we use inheritance

[@OasisFinder]

first of all inheritance and abstract both are different thing ,inheritance is a concept and abstract is a keyword, we can inherit both normal class and abstract class by using "extends" keyword.

[@dhavalshah3519]

Can abstract data members be created??

[@rohitmehetre3496]

sir it is compulsory to have one abstract method in a abstract class

[@Telusko]

Nope

[@pratibhajaiswal9665]

if phone is abstract class how can you pass its object?

[@i_karank]

sir u said we can not create object of abstract class! and then u are creating object of abstract phone class in parameters!!! why??

[@iAdrianT]

public static void show(Phone obj) this wont create a new object, it will just pass the object of type Phone to the method

[@SaiKiran008]

I think...mahesh class having microwave method is wrong Please change it

[@foton8998]

superb!

[@hariomdubey8352]

when you explain with the help of graphic pic,,it must be clear and bit big size...

[@saurabhmahra4084]

want a phone which can charge itself xD, great idea though.

[@2017-q7y]

Amazing

[@pavelooo2289]

thank you

[@ankushshah5422]

😕 Confusing

[@hasanmehmud8607]

great..

[@thestarinthesky_]

Very confusing. I almost understood nothing! Some videos are very good but this one with those confusing names , Ramesh, etc. made me confused.

[@kirtijogi1990]

I get confused

[@eshanthkumar1923]

welcome aliens lolz

[@trinhgiatrang]

it sounds like "welcome idiots"

[@rajaavel4967]

Pls say related to that concept ur r talking unwanted more

[@nani-vr7me]

8: 17 Show (new phone()) ;

[@rahulgoyal3287]

Hello moto😂

[@satoshinakamoto171]

i think this example is much easier for indian students. names are confusing. and sub icon obscures the examples

[@manumohan6008]

confusing

[@bgv117]

Are you telugu

[@ajaygalagali5963]

:)

[@pinky_arya]

sir ye mahesh , ramesh ko kya zaroorat hai itne methods declare karne ki , jab unka code nahi bana sake ....bechare suresh ko virasat main ye abstract means aadhe adhoore methods hi mile ...wo ek paper main hi likh leta na , class main likhne se kya ho raha tha ..bevkoof