TOP 6 difference between Abstract class and Interface in JAVA || Must know facts

This tutorial covers the difference between abstract class and interface.As we go further with this tutorial we are going to learn the top 6 difference when we compare interface vs abstract class in java.

First Lets talk about what is interface in java and what is the use of interface in java ?

So when we know the specification but not aware of the implementation, then we should go for an interface.

Then the next question will be what is abstract class in java and what is the use of abstract class in java ?

The answer is very simple, When we know the partial implementation then we should prefer abstract class.

I will try to demonstrate you the difference between interface and abstract class with a simple example with this tutorial.

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The abstract keyword is used to create an abstract class whereas interface keyword is used to create an interface.

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The variable of an abstract class can have final, non-final, static and non-static variables whereas the variable of an interface should be always public static final.

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Another difference between abstract class and interface in java is :
we can achieve multiple inheritances by using interface whereas with an abstract class it is not possible as multiple inheritance is not supported by java.

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Why we need constructor inside an abstract class ? || Popular Java interview question

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An interface in java can have an only abstract method within it whereas the abstract class in java can have both abstract and concrete method within it.
(FYI: from java 8 we can have both concert and abstract method within an interface )

To know more, watch this tutorial :

INTERFACE IN JAVA 8 with REAL TIME code ||Why DEFAULT Method?[Explained]

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Well, we can have few more differences as well but these are the few common difference between abstract class and interface in java that each developer should
aware of.

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intro template :

[mdmojahidshaba]

Nice bro. thumbs up (go to 5:55 and make some correction you made both abstract method.)

[crazyrider]

This is how it should be explained! Every segment is explained and covered with an example, well done. No time wasted here.

[inesbrenner]

Finally someone who knows how to explain things, well done!

[manikannanmarimuthu]

Finally came to know the clear the difference between Abstract and Interface. Thanks bro.

[xerinaysawutaji]

Best video about the interface and abstract class. so glad to watch it.

[pallavrajput]

Good explanation !! Also one important reason why abstract class has constructor is to achieve constructor chaining. As we know the sole purpose of abstract class is to be extended. Now in any sub-class when object is created and initilized the first call under its constructor is call to super () i.e call to super class constructor and so abstract class has constructor. So if you don't keep any constructor explicitly then jvm keep one default constructor to abstract like other normal class. A constructor chaining goes till Object Class.

[AmeyChittar]

Wow this is the best explanation for interface and abstract class. Thank you so much.

[zameerahmed]

Ur concepts are crystal clear This is the best video abt abstract classes and interafaces. Keep it Up God bless you and ur family

[akshatjain]

Maqsood bhai tum boht acche se samjha ta hai !! thank u

[jaganmohanmylapuru]

Best Instructor at Best time . Currently I am trying to switch company your videos conatins most of those questions with best answers(Indian Version). Feels like entire Java interview questions at one place .
Thanks is a small thing :D

[NourKhafaji]

Well done . Thank you for the clear explanation.

[varunrickstudios]

Fantastic explain thank you You are Spark 🔥

[sainathpabba]

Good one. (at 16:50 the constructor and class name mismatching.)

[prima]

Thanks very much for this video. No offense, but when I saw that you were Indian, I almost didn't watch. I have a problem with accents at my age, you see.

Anyway, because your accent wasn't that thick, I struggled through, and I'm glad I did. Yours is probably the best video on YouTube for explaining interfaces and Abstract classes. Everybody else just parrots what they've heard in other videos.

Thanks again, I plan to watch more.

[vijaymohan.p]

In Java 8 : Functional interface is an interface that contains only one abstract method.

[vakkalahari]

I like this channel very much Abhilash will teach very easiest way !!!!Thank you😇😇😇

[shashanksinghsisodiya]

Why dislike to this video..disliker please give explanation?? Your videos are very helpful dude👌👌

[ramanavanchanagiri]

Seriously this is top class i literally lost 3 interviews because of this question but this time i confident to answer

[ankush]

This is how it should be explained. Crisp and yet detailed. Thanks for making this man 👍🏽👌🏽

[АльфредГордан]

thanks...you are so cool.very clear explanation