#66 Need of Interface in Java

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#66 Need of Interface in Java

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Күн бұрын

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In this lecture we will learn:
- Methods in java
- What is an interface?
- Need for an interface
#1
- We can also pass an object as a parameter in a method.
- When you build an application, you need to make it more flexible.
- We can create a reference of the parent class and an object of the sub-class.
- Passing reference and the reference of an object that you accept in a method, both should be the same.
#2
Interface:-
- Interface in Java is used to achieve abstraction.
- Interface is used to design an application to make it loosely coupled.
- implements keyword is used with a class to extend it to an interface
interface Computer
{
}
.........
class Desktop implements Computer
{
statement;
}
#3
Need of an Interface:-
- It is used to implement abstraction.
- We can also achieve multiple inheritance in Java, by using the interface.
- Any class can extend only 1 class but can any class implement an infinite number of interface.
- It is also used to achieve loose coupling.
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Пікірлер: 56

@leonardorafaelli8026 4 ай бұрын

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

@amanjain5045 Ай бұрын

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!

@SATHWIK05 10 ай бұрын

Good explanation sir Understood everything....

@SP-vq7tg 3 ай бұрын

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

@sarthakavaiya3360 19 сағат бұрын

great way of explaining interface

@sher.5027 6 ай бұрын

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

@painisgain1003 29 күн бұрын

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

@sastisfya2721 11 ай бұрын

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

@TreatsNTravelsByJaaiPawar 11 ай бұрын

Hi 5 .. just completed this video!

@merrylia8316 10 ай бұрын

🤗

@HabiburRahman-dm5yt 3 ай бұрын

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?

@amsha3083 Жыл бұрын

Extremely Ambiguous

@user-ct8yf3wd2g 10 ай бұрын

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

@user-nq4ho4hp5v 9 ай бұрын

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

@Sanjay-xq5xr 2 ай бұрын

Awesome explanation with example.

@andrewjenson_original 5 ай бұрын

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 3 ай бұрын

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

@i_dhiraj 2 ай бұрын

u are awesome sir u teaching very fine respect !

@abhishekkale8750 5 ай бұрын

what a great explanation. thank you Naveen sir

@JavaMoth Жыл бұрын

Yep, it's clearer now

@sridharmurari3007 10 ай бұрын

One question when we need to go for Abstract vs Interface

@user-wk9vo1we4v 2 ай бұрын

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

@MohdKhan02 5 ай бұрын

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 Ай бұрын

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.

@kamakshijayaraman3747 Ай бұрын

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

@aszaw5342 Жыл бұрын

Great explanation!

@kns436 3 ай бұрын

Ur old video on this is far better

@madhukarverma5634 2 ай бұрын

Too good sir

@vipassassin404 6 ай бұрын

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 6 ай бұрын

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

@linquanma6145 Жыл бұрын

Very nice example

@pst659 3 ай бұрын

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

@ALIHAMZAAKRAM-oe2su Жыл бұрын

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

@YouTube.com33 11 ай бұрын

I Can Understand Sir😍

@sahilthegeek Жыл бұрын

amazing tutorial😀😀😀

@shraddhapawar5674 Жыл бұрын

Best teacher

@majorgab1998 10 ай бұрын

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 10 ай бұрын

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

@user-uk1dx2nc1l Жыл бұрын

great bro

@ALENBELJI 10 ай бұрын

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 10 ай бұрын

Same doubt

@001vidhu 7 ай бұрын

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

@davidhusted817 6 ай бұрын

This is the downCasting

@thanveerpp1983 4 ай бұрын

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