#67 More on Interfaces in Java

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#67 More on Interfaces in Java

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Күн бұрын

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In this lecture we will learn:
- Implementation of multiple interfaces
- Inheritance in between interfaces
- Method calling of an interface
#1
- We can have a class implementing multiple interfaces.
class B implemets A,X
{
}
(here, A and X are two different interfaces)
- Implementation of all the methods that are present in those interfaces should be given in a class.
- Inheritance is also valid in between interfaces.
- Inheritance can be achieved in between interfaces by using the extend keyword.
- Whenever you create a reference of an interface and create an object of a class, then you can only call those methods by that reference that are present in that interface of which the refernce is created.
- Methods of another interface can be called by using another reference variable for that interface with the object of a class.
#2
*
class - class - extends
class - interface - implements
interface - interface - extends
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Пікірлер: 19

@grrlgd3835 Жыл бұрын

I started with Navin 3 years ago. I've watched lots of others since aswell but he remains the best.

@masteradvisor594 Жыл бұрын

sir u r perfect always do crisp video upto point. Thank u so much for such amazing playlist.

@psnvenkat2284 11 ай бұрын

Also there are new features for interfaces in new JDK version, where we can use default method and static method with implementations inside a interface class. FYI

@nguyenquanghau7158 Жыл бұрын

I have an idea for that, we just change type data, for example, we declare that A obj = new B(), and we could you some methods that belong to the A class. But we want to use the run function that belongs to the B class, simply using this command ((B) obj).run(). It will work well.

@suraprashanthreddysura487 11 ай бұрын

Yes it worked, but don't you think it is written purposely . Like behind it we have a reason?

@psnvenkat2284 11 ай бұрын

This is call method casting for obj reference. Am i correct?

@merrylia8316 10 ай бұрын

is this a one-time use(liek after that command the reference is still A)? or does is change the reference of the obj from A to B?

@merrylia8316 10 ай бұрын

great explanation. thank you so much 🤩🤩

@target__iit 5 ай бұрын

(Next Video) Need of Interface in Java -> kzfaq.info/get/bejne/d62PatqIq6jVpYU.htmlsi=Pb8fNRY3lLjxzrL7

@ryansinclaire8463 9 ай бұрын

You're saving my life! Thank you!

@batambuzestephen8243 6 ай бұрын

I also observed you can extend a normal class and implement an interface within one class

@Trading_Club007 9 ай бұрын

you're saving my money

@vinny4161 Жыл бұрын

Better to create class B object with reference B so that we can access all methods of interfaces and class B

@TuxTuxedo-oc9kg Жыл бұрын

I asked myself the question and tried it out since I was not sure what would happen. All of a sudden I love interfaces lol. You can restrict by making the object of either type 1 or 2 (interface 1 or 2) or you can make it access all interfaces by instantiating an object with the type of the implementing class so it gets access to both interfaces since the class implements both. even works if the interfaces methods have the same name, since they have no body you have to implement the method body once yourself. cool stuff!

@merrylia8316 10 ай бұрын

@@TuxTuxedo-oc9kgomg I just realized by reading your comment that I can access the methods in both interface A and X by creating an object of class B with class B as the reference. different approach than what sir navin did in this video.

@jatinsharma3792 7 ай бұрын

You missed why we use the default private and static method in interface after Java 8 ?

@bhaskarreddy.b2818 Жыл бұрын

Sir even class b also should become abstract because the methods we using are abstract in interface class

@uday2159 Жыл бұрын

The B class should be abstract when we not define all abstract methods in it and later we can define remaining methods in sub class of B. Then finally the subclass of B should be non abstract class.