OOP 5 | Abstract Classes, Interfaces, Annotations

This fifth video of the complete object oriented programming (#OOP) course in Java will clear some of the most important concepts for you about multiple inheritance.
Covering abstract classes, interfaces, annotations, and more!
Complete OOP playlist: • Object Oriented Progra...
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=========================================
Timestamps:
0:00:00 Introduction
0:00:30 Multiple Inheritance Problem
0:01:08 Abstract Classes
0:06:38 Example of Abstract Classes
0:16:45 Abstract Constructors
0:17:15 Object of an Abstract Class
0:17:40 Abstract Static Methods
0:18:04 Static Methods in Abstract Classes
0:21:52 "final" Keyword in Abstract Class
0:24:18 Multiple Inheritance using Abstract Classes
0:25:10 Interfaces
0:31:29 Example of Interfaces
0:43:41 Variable of Interface Type
0:47:42 Separate Classes in Same Interface
0:55:01 Extending Interfaces
0:57:18 Annotations
1:02:05 Important point regarding Static Interface methods
1:06:17 Nested Interfaces
1:09:31 Outro
#placement #dsa #interviews

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[@Cono314da]

@@KunalKushwaha at 23:15 why cant it be "final int VALUE = 30;", rather than value being initialized in the constructor?

[@vinathasree168]

@@Cono314da can't be inherited, so we put it in a constructor to initialize it

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Kunal I am having 2.5 years of experience in IT and now preparing for a job switch. I am following all your videos religiously. The content you are providing is just priceless. Your way of teaching is so lucid that nothing else than series is required. I am so much enjoying it like a web series , and yes learning was never so much of fun. I India I think we need no college we only need Kunal to make quality engineers. In college they cannot make these these things clear in 4 years and you did it in just 40 min. God bless you . Keep sharing your learnings .

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[@avinashsingh7722]

Thankyou so much Kunal this is the best video i found on abstract classes and interfaces. Learnt a lot from this. ;) Message to fellow people just stay away from involving in controversy. Our main motive should be to learn from anywhere we can. Thankyu kunal for providing top-notch content on OOP.

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ngl this is the best DS and java course I've ever seen. tbh I'm struggling a little bit but ig i need to do more practice and exploring

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this is the most awesome java tutorial I have seen on youtube so far. thank you so much!

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Ocean of knowledge in this video about Interfaces and Abstract classes. Love the way you teach ❤

[@KunalKushwaha]

Thank You

[@Helly_Patel]

Thanks for teaching us like no one did till now!! One small request, please make lectures on dynamic programming as well!!

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There can never be a better example than the MyCar Example. What and example! Most concepts Kunal taught till now are there in this single example. You are the Best!!!!

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Thank You!

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Your dedication ❤️

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Hey kunal, a lot of appreciation man, did a great job. But its' hard to wait for upcoming videos for advanced algorithm, DP, trees and graphs videos etc.

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best teacher ever!! hats off..

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As always the best one !!

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The best OOP Playlist in java

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[@user-jy1yu4kz9p]

Notes bhej de bhai

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all are awesome lectures

[@BackEndGenius]

Best explanation on Interfaces.

[@arshadansariv]

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[@amanjain0842]

great great great explanation of Interfaces using examples

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i failed in my interview because i did not come across by your channel. I did not know all of the concepts you have taught in this video and interviewer was asking all of these stuff. Now, i will ace that interview next time :) Thanks alot. Best series ever!

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killed it dope explanations helped me a lot!!

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Not only OOPS bro , DSA also though some topics like graphs &heaps are not covered. We are waiting for these videos🙃

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[@parth_chovatiya]

1:02:11 Static method can inherited If you declare, another static method with same signature in derived class than the static method of superclass will be hidden, and any call to that static method in subclass will go to static method declared in that class itself.

[@uditbhaskar]

Nice joke buddy, good luck with java.

[@mohanprajapati2051]

@@uditbhaskar The only difference with inherited static (class) methods and inherited non-static (instance) methods is that when you write a new static method with the same signature, the old static method is just hidden, not overridden. If you declare the same method in a subclass, you hide the superclass method instead of overriding it. Static methods are not polymorphic. At the compile time, the static method will be statically linked.

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@@uditbhaskar good luck for your java.

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great to have this..

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that car interface explanation was just fabulous!

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Bro you are doing amazing work But make sure to put time stamp on every video

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this is free and so useful for interviews prep

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[@harsh_Vashisht_]

Thanks Kunal

[@Cono314da]

@KunalKushwaha, at 23:15 why cant it be "final int VALUE = 30;", rather than value being initialized in the constructor?

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You're really a cause of prideness of India..

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The best video.

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Thank you ❤️

[@amitkumarsharma5710]

exact at 12:13 Kunal just thought of his love😍

[@anubhavgarg1728]

At 50:20 I wanna know why did we create a reference of Engine interface in NiceCar class? I have a possible explanation but not sure if it is right. According to me we did that because we have also created a constructor which instantiates the engine interface reference to an object of a concrete class which has implemented the engine interface. Thus, if we simply create a reference of engine interface then we are going to be able to assign it to an object of any class which has implemented the engine interface eg Upcasting will handle the implicit casting of an object of a class type such as ElectricEngine to a reference of Engine interface. In other case if we create a reference of class such as powerEngine then at the instantiation time when we try to access the constructor and assign this reference variable to an instance of Electric Engine type, it will simply display an error.

[@saileelakrishna329]

Thanks for your explanation in English....

[@vineela-meduri]

Hi Kunal, can you please include topics related to comparable, comparator, finalize and finally??

[@prasoonagrawal6072]

as always maza a gya

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Great video.

[@arshansari458]

Thanks bhaiya U read comments ,so if u read it could you tell me What will you follow in python+ML like tensorflow stuff or different??

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Nice one ❤

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In GMS screen select appes and then select Analog app 1 TE. That worked out for .

[@vishalkumaranand3279]

47:50 Brother, if you made different classes that implements different interfaces then how it remains multiple inheritance ,what was the purpose of interfaces? Please explain.

[@-AnveshSamrit]

I have a doubt that how its solving that was occured in multiple inhertance , like media also has void start() and engine also has void start() but it's showing only one , not two . then what if I want to implement it for media

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thank you so much!!!!!!!!!!

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Thanks alot

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Great video

[@DivyanshGemini]

@KunalKushwaha *Not getting AutoGenerated English subtitles in any of your video.* (May be due to video language set to Hindi)

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It's a great morning! 😇#DSAwithKunal

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thank you very much