8.21 Interface in Java Tutorial with Example

[@RemiStardust]

I learned something I had not understood before! This was a good use of my time, thank you very much!

[@nadipriya1579]

Pòoo

[@jyothikrishna2588]

I was understanding this concept through some of the articles but I just could by heart it really couldn’t understand. When I saw this I got the concept in the first 4 minutes itself. U r the best java teacher ever. Thanks a bunch

[@kspavankrishna]

3:57 it's not xyz it's Pqr Am I right ?

[@palashshanu]

yes

[@teamehailu5931]

The way you explain the concept is so amazing. I love it.

[@nadipallisaikrishna6510]

Implementation of functional interface nice explained,thank you very much sir,just stand out of box

[@krishnasalampuriya1311]

I was finding this from long time , finally got that from you , very very thanks....

[@ProfesorBruno]

Great explanation. Thank you so much! You're an outstanding tutor. Well structured video, concise and informative, as usual.

[@mayureshwarkhurud3208]

Your videos are just outstanding....we get to know new concepts in very less time as compared to other videos

[@TheFlyguy31]

i like the way you explain these examples, it is very creative..

[@gauravmandwariya333]

bhot heavy jaa raha h sir ab to after 90 video

[@madhavanrao3626]

You are just awesome sir👏👏👏

[@srinuchallagundla6412]

Thanks for your great tutorials

[@jojomojo1677]

sir thank you very much !!! You are best teacher!!!

[@Er_IT_prashantjha]

Kal interview hai 😂😂 Bing watching your lectures 😂😂😂

[@ralphmichael3355]

Loved it! Simply great :)

[@sapnavats9105]

As you said in your earlier video on interface that we cannot create an object of interface so out here while using anonymous inner class why are you creating on object of the interface Abc?

[@dhanush2715]

@@zanspehonja4467 No What u said finally doesn't works

[@dhanush2715]

The reason why we cannot create an object for an interface is that, there is no implementation for an interface class... Hence we cannot create object.... But what if we do that implementation so that we are able to create an object.. That's what he does in the inner anonymous class=implementation.. That's it...

[@cyber_dbs]

does the annonymous class you have created implements Abc? you missed to explain that...

[@A2DChannel]

Everyone? hv i heard everyone?? where's alien?

[@rareangel15]

You cannot create object for Abc right because it's interface but how you create?

[@RiteshKumar-ri1xq]

Excellent explanation.

[@souparnamukhopadhyay5210]

lec(8.21) - interface example the method show() should be public in the class 'abcimpl' at the time of defining the method. why it is so? please explain

[@saurabhmahurkar5890]

If the method is not public then how can we create object of that method's class in another class, that's why it is made public!

[@Alldata123]

Good good good explanation

[@avinashjadhav9265]

Current year is 2023 and i understand what is interface by his video

[@genprimabiocakti6159]

SO lamda expression ()-> is using for interface that have only ONE abstract method. to implement method the class who impl interface, we can using static method. CMIIW

[@vladanulardzic5859]

Well done ! Keep on ...

[@studyaddicts2772]

Love you Sushant

[@xtempo9913]

Sir why we have to make void show 'public' in AbcImpl class ?

[@skillkrio]

Hi Marek, I read you java tight and loose coupling article. I had certain doubts in loose coupling watched several youtube video and article but still couldn't grasp certain points. I will explain what i understood and what confuses me . In loose coupling we restrict the direct coupling between classes. But in tight coupling we are bound to classes. Let's take an example. I have one Main class and another different class with the name Apple. I am creating instance of any of this class in Main class by Apple apple =new Apple(); //Apple is tightly coupled to Main class apple.eat(); //If eat method signature is Changed to drink in the Apple class ofcourse we need to change the method name here also right?. Let's see loose class interface Fruits{ void drink(); } Class Apple implements Fruits { @Override public void drink (){ Printing some message; } } class Main{ public static void main(String [] args){ Fruits apple = new Apple (); //loose coupled ?? apple.drink(); } } If i Change the method signature in loose coupling from drink to pour . I need to change the code in 3 different places. 1. method signature inside Fruits interface(drink to pour) 2.class Apple(method override from drink to pour) 3.inside Main class(method call from apple.drink to apple.pour) What's the point of using loose coupling here. In tight coupling once I modify the coupled class(Apple) i am forced to update the Main class. In loose coupling also I am doing the same process .what's the point of using it. The only benefit that I can feel through loose coupling is the interface reference type .for example Tight coupling code Main class{ //boiler plate code Apple apple = new Apple(); } In future if i create Mango class i need to create another object in Main class like Mango mango = new Mango(); Loose coupling code Main class{ //boiler plate code Fruits apple =new Apple(): //In future if i Change Apple() to Mango() no error will occur here because of the reference type(Fruits). } Please help me to understand with this analogy

[@user-mo3bk6wv6l]

how are u recording this at 7:10am?????? i can barely spell my name that time

[@payambassi8784]

Tiny mistake i think at 4:01 ,it should be "implements Abc , Pqr" not "Abc, xyz"

[@jeffszurgot]

Ok I understand nie how IT od create, but still don't know why ( what for)? What od the purpouse od interfaces

[@tanmaysharma5684]

when there are more than 1 method in interface then how to use lambda expression

[@PramodSubramanyam10]

U cant use Lambda expression when u have more than 1 method in interface..Suppose if u want to use lambda then for each method u need to create an interface.. public interface Inter { public void show(); } public interface Inter3 { public void display(); } public class Inter1 { public static void main(String[] args) { Inter obj = () -> System.out.println("hello show"); Inter3 obj1 = () -> System.out.println("hello display"); obj.show(); obj1.display(); } }

[@dhanush2715]

If there are more than one method in a single interface, u must use curly braces right after the arrow mark, as shown in the video

[@rotorfpv4117]

what is the point with the interfaces ? I cant see functionality of this one. The Interface is created to inform me about some name of methods which I must to use and implement. And where is the sense? I use some classes with my method regardless, if I implements interface or not.

[@PramodSubramanyam10]

Interface provides security as told by Navin sir in previous video If u want to inherit hundreds of classes into 1 class, then it can be easily done by interface....

[@saurabhmahurkar5890]

heard of abstraction? It is used for that purpose!

[@philipT8989]

why cant u just implement Abc in the class Telusko?

[@shaktimanvlogs7294]

sir can u tell me the question which will ask durin interview on interface?

[@fazchow4679]

Can you make a tutorial series on Scala Programming? Your tutorials are really helpful. Thank you for your effort. You make learning really easy and accessible.

[@Chirag_vaghela01]

sir can we run this in the notepad also !?

[@hemantjadhav1128]

hello sir....nice video

[@akshaygulati2041]

+Telusko learnings...can u suggest something abt this error...

[@gargisingh1528]

my interface code is not executing sir please recommend something

[@saurabhmahurkar5890]

Can you elaborate the problem faced?

[@tamim2996]

Hello Sir, I have 1 question...ur saying interface is use to do multiple inheritance. But my question is in inheritance the method is already implemented we inherit the class and just reuse the method instead of rewrite it again....but in interface the child class has to implement the method...so where is the benefit of using interface if i have to implement the mhod in child class... The way you teach java its just amazing. Thanks a lot.

[@syedabbashashim6763]

bro As interfaces are abstract therefore we cannot define a method directly inside it infect we need a class to do this task therefore using this technique we can declare multiple abstract functions inside multiple Interfaces in order to perform multiple inheritance because Mutiple interfaces can be implement with one class but not multiple classes can inherit each other.Therefore Interfaces is an alternate way to do multiple inheritance in java using classes.

[@shubhamsingh-nt9mm]

u r doing a great job,one suggestion if u can upload all the tutorial program that u have used in the video on github

[@ganga1]

But obj is an reference, we didn't have any object... without NEW keyword will it work

[@lilrana]

Sir can it possible that interface class method can define differently where different classes implements it.

[@Deepusingh-ct6kx]

Yes

[@mokasafatamirbehesti5657]

Got it. ❤️

[@anikettambe8147]

Sir can we have variable in Interface

[@ankushtyagi729]

yes but only public

[@Devilnero1991]

But why use an interface? If I delete the interface all that does is shorten my code, which is good! so whats the use of an interface?

[@divyeshkumarbalar7732]

I was trying to put variable in interface; but, i cant just declare it; i have to define it as well

[@divyeshkumarbalar7732]

and that variable behave as final by default

[@Jai_Raj_007]

Fantastic

[@akshaygulati2041]

class A{ int i=5; } interface B{ int i=6; } class C extends A implements B{ public void show() { System.out.println(i); } } class main{ psvm(String...a){ new C().show(); }} this program shows ambiguos error. Can any1 explain it??

[@akshaykumarsingh3637]

chenge the class name then exucute

[@RahulKumar-pd2cm]

use either A.i or B.i instead of i , this will remove ambiguity during calling

[@RahulKumar-pd2cm]

System.out.println(A.i); or System.out.println(B.i);

[@Arunganesan1]

Many thanks for asking this question.This is what I want to know?....

[@bass9454]

very good vids

[@khanmusarratbegum4917]

Not getting abstract and interface its confusing

[@anant8884]

Suggestion : Please use better variable names. These types of name needlessly increase complexity.

[@dhanushsivajaya1356]

Thankyou sir

[@mohammedviso2269]

Thank you

[@cakfarm7816]

Subscribing.

[@venkatmaddirala5568]

@telusko , please upload videos on java io

[@BabuBabu-nn5fv]

👌

[@mysticstardust1109]

still quite confuse...

[@BabuBabu-nn5fv]

Woo

[@ajaygalagali5963]

:)

[@bass9454]

are you jesus?

[@shubhammaurya3671]

confusing tutorial