#66 Need of Interface in Java

[@leonardorafaelli8026]

What an awesome tutorial! You showed the problem and then showed how to solve it, simple and direct. Perfect, thank you very much!

[@SP-vq7tg]

Simply Woow!! Its crisp and clear.. I spent 17k on Java course and ended up confused. Wish i had found you before...

[@SATHWIK05]

Good explanation sir Understood everything....

[@amanjain5045]

I really do not know how to thank you! The real life example you show, and the way you show it step by step. The reason I am now good at Programming is not because of my University, it is you!

[@lunarstar7965]

What a great example to explain this concept!!

[@rsz90182]

Thank you, that was well done and quite simple to understand. Most teachers make this into rocket science and scared me away. I am finally beginning to understand it.

[@andrewjenson_original]

Hi, I'm confused. It seemed like your video showed the value of an abstract class Computer. But, then, in the last 10 seconds of this video, you changed Computer from an abstract class to an Interface. But, I'm not sure what the value is for changing it to be an interface? It seems like the real value was gained by having Computer be an abstract class.

[@srikardevarakonda2933]

Exactly.. same doubt.. this is a video on abstract class, not interface.

[@insolus2307]

I am not sure but iirc the advantage here is that interface allows multiple inheritance, abstract class or classes in general do not allow that, so for example if we need not only Computer for dev to code on but also specific OS lets say for this example like Windows or macOS or Linux etc.. then we can create another interface and have that implemented as well by the classes, eg. class Desktop implements Computer, OperatingSystem{//code for both}

[@rajeshbollam4920]

Abstraction can be achieved by both abstract classes as well as interfaces. However, interfaces are usually preferred because multiple interfaces can be implemented in a single class. If abstract classes are used, then the main drawback is that abstract classes are extended, so if you extend your abstract class to implement abstract methods, then you will not be able to extend other classes, as only one class could be extended, thus limiting the scope of the class to perform many functions.

[@ManojDoodee1171]

My concept of Inheritance cleared totally in this video. What a worthy video. Now inheritance ka

[@shauryasinghrajput411]

Thank you sir, you explained it wonderfully

[@revanthff7403]

The explanation was awesome every student can learn easy seeing this channel videos

[@HabiburRahman-dm5yt]

Your teaching is well. but here I have a question. You have showed loose coupling using inheritance, abstraction and interface. All are working well. But when can we choose the suitable one?

[@shishirchitre1945]

Thanks a lot for this lecture!!! Cleared many concepts.

[@harshitjain8820]

Best explanation for this concept!!

[@baili8654]

Very thank you, you made me very clear about this. God bless you!

[@sarthakavaiya3360]

great way of explaining interface

[@painisgain1003]

Thank you so much, I've been looking for a good explanation of interfaces :)

[@sridharmurari3007]

One question when we need to go for Abstract vs Interface

[@2192_RAHULPATIL]

Whenever you want partial abstraction use abstract class and for full abstraction use interfaces

[@Sanjay-xq5xr]

Awesome explanation with example.

[@HardikT-md1ls]

Sir you are awesome. ❤

[@rlifts]

Brilliant ! Subscribed.

[@abhishekkale8750]

what a great explanation. thank you Naveen sir

[@JavaMoth]

Yep, it's clearer now

[@sastisfya2721]

Congratulations boys and girls for more than 60%completion !!!! Just a few more to goooo!! Les ghoooo💪

[@TreatsNTravelsByJaaiPawar]

Hi 5 .. just completed this video!

[@merrylia8316]

🤗

[@pranalijadhav_2681]

Thank u so much sir😊❤..

[@amsha3083]

Extremely Ambiguous

[@ajayghode3602]

Thank You

[@somnangvirakvonprince]

I tried this and it works fine but there is a flaw. if the variable type is Computer then I cannot use the property and method of the children class as the compiler at the moment we compile the code only know the members of the Computer class. But it works if we just want to reuse the code function with different implementations. Great video by the way sir

[@DeepakSingh-n2g]

What you tried now (And what's in the video), is called "Upcasting". Maybe you can explore more about "Upcasting" and "Downcasting" in Java.

[@i_dhiraj]

u are awesome sir u teaching very fine respect !

[@VinceRyanDizon-xl9sb]

Wow, just wow

[@ham3ltonion]

Too good sir

[@sciekoszczur]

thank you bro

[@AOCalive]

Fucking genius way to talk about coding when relating it in such a way of our reality, ty!

[@vipassassin404]

When I try to keep a method which is not a public in the class which implemented from an interface,why it is showing error...

[@davidhusted817]

What about if we make a method code as abstract and use anonymous class , because the best practise to avoid instantiate classes further we need it because that make memory leak

[@ManojMehra-b7i]

great bro

[@aszaw5342]

Great explanation!

[@ALENBELJI]

When we create a reference to the parent and object of child we can only access the methods of the parent but how did you code was able to acccess the methods of the child

[@SATHWIK05]

Same doubt

[@001vidhu]

Its the object of child class & its not upcasted. thats why .

[@davidhusted817]

This is the downCasting

[@thanveerpp1983]

@@davidhusted817how this is down casting This is upcasting ,because the object of child class has been assailed to parant class object variable

[@sher.5027]

Bhai, you are the best teacher who teaches with the best and simplest examples.

[@kamakshijayaraman3747]

you just showed what an interface can do with abstract class. what is the difference? why we need interface

[@sahilthegeek]

amazing tutorial😀😀😀

[@likithmc3435]

Desktop ❌ Dekstop ✅

[@linquanma6145]

Very nice example

[@aryaC099]

0:40 I beg to differ, sir. Corporates prefer the term "slave" 😭

[@MohdKhan02]

whats the basic difference between using interfaces and implemenths rather using abstract class with our regular inheritance extends keyowrd? can anyone plz explain me?

[@arsh3250]

Well, the interface has a lot of specific features. Like here we are allowed to perform multiple inheritance i.e a class can implement more than one interfere, no the case when we are using abstract classes. Also, we need to keep in mind that abstract classes are not solely for designing, I mean we can have concrete methods in it as well right? But you know interfaces are purely for design purpose, the methods in it are by default abstract and public.

[@YouTube.com33]

I Can Understand Sir😍

[@Munna-09-i7]

I think your mother tongue is Telugu 🌚

[@yuv09]

Your provided source code is self explanatory.... Code + video = Java dead 💀

[@shraddhapawar5674]

Best teacher

[@MajorGabTech]

What is the main difference between abstract and interaface? Besides the fact that interface is not a class, how to know when to use which ?

[@madhusudhanreddychencharap4881]

In abstract class there is a chance to add concrete methods but on other hand interface is 100 % abstraction no concrete methods allowed

[@karthikgururajan1131]

navin sir flexing his macbook xD

[@ROSHAN-HARI-BALAJE]

0:40 Humans? but... but we are aliens!!!!

[@pst659]

stil you didn't explain why we need interfaces. you only explain why we need abstract classes

[@GOKULK-ll8ur]

i thought we were aliens

[@ALIHAMZAAKRAM-oe2su]

hy ,sir in the #65 video you should modify your example as the comapny can give a developer a laptop or desktop rather than a devolper need a laptop due the wrong example i have to see the videoo again to understand the concept

[@danielderese3170]

TTTHHHHAAAAKKK YYYOOOUUU!

[@sourabh515]

very confusing for newbies

[@vishwasrchonu7134]

Bro, you are pretty awesome, but by what logic are you saying desktops are always faster than laptops? 😂😂😂😂

[@vishwasrchonu7134]

Of course, you're a human, but let's just say you're a developer 😂😂😂😂😂😂

[@amroulouay6819]

Dekstop😂 3:28

[@bellsvlog2064]

just waw

[@Decoding108]

Why u make everything so hard to understand , don't use your 10 years of experience in explaining lit things