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

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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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An interface can’t have a constructor within it whereas the abstract class can have a constructor within it.know all the reasons why the abstract class does contain a constructor, you can follow the below tutorial by clicking on the link :

[

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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Java interface vs abstract class

What is the difference between an abstract class and an interface
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Abstract Classes vs Interfaces (Java)

A simple example that demonstrates the use of both Abstract Classes and Interfaces. The two can be used in many different ways, either exclusively or in combination. We chose to keep them separate in order to demonstrate the main differences.
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Abstract Class vs. Interface in Java 8

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Difference between Interface and Absract Class

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Top 10 Facts That You Should Know About Abstract Class in Java, Software Engineering Design Patterns

Abstract Class in Java: Top 10 facts that you should know About it and it's used in Software Engineering Design Patterns and OOP (Object Oriented Programming) everywhere. There are top 10 facts that you should know about Abstract Class in Java. Even though it is in Java, but you can apply these things to other OOP languages.

If you new, my channel is about Android App Development Tutorials and Java Programming. And I just create a new course series called Design Patterns of Software Engineering. And Abstract class will be used a lot in the course. That is why before you can begin, you have to understand the abstract class.

Abstract class is one of the most useful features in OOP, yet Abstract class in Java is a difficult subject to understand for most OOP beginners. Abstract class is a bit mysterious its own way. It has been employed every time in Design Patterns. The first reason to use Abstract class is polymorphism. I will make another video to explain why you should use Abstract class, and why you use polymorphism and how to do it.


Number 10, Abstract class in Java must declare with abstract modifier.

Unlike a usual class, or a concrete class that you begin it with class keyword with one of 4 modifiers (public, protected, private, or blank for default), abstract class must declare with abstract modifier. Even though it is obvious for learners, but it is also important to stress out first.

Number 9, Abstract class in Java Cannot Create Instance.

One of most iritated thing about abstract class which seems also like to break the OOP rule that you can create an instace from a class. In fact, abstract class is a way to prevent you from creating the instance. There is a good reason why and when you don't want to let anyone to create an object from a class. We will learn more about it.

Number 8, Abstract class can be called by inheritance.

Even though you cannot create an instance from an abstract class, it does not mean it is the end of it. You still can get any non-private methods and properties from your parent class by inheritance.

Number 7. Abstract class Can be a type class.

Remember that I told you about polymorphism? How polymorphism works then? I will dedicate a video about polymorphism in Java but now I can tell you this: polymorphism will let declare an instance to be of a parent class type and then you can point to the child class. So Abstract class will always be your parent class type. Imagine a strategy game that in your game you can create many soldiers. But there are 3 types of soldiers like Marine, Airbone and Commado. They have common skills but different type of soldiers have different type of skills too. It is a good idea to create the Soldier class as the Abstract parent class and the others are the concret child classes. Now you can declare an instance named John Wage, for example, with a Soldier class type but he is a Marine.

Number 6, Abstract class in Java can have both abstract methods and concretes methods.

As in our earlier example about the Soldier, some skills are common like shooting, jumping, walking, but the other skills like parashooting is just for the Airborne soldiers only. That is why Abstract class can have both concrete methods for common skills and abstract methods for special skills.

Number 5, Abstract methods Without Body Code.

Why abstract methods have no body code? This is the most common questions students have ever asked. And followed by another question like, if there is no code, how does it work without no code? Well, the answer is, it does not work without code. But the intention of Abstract class is not direct call from users. You see, people always confused that after they create a class, they can just use the class. But there can have another layer below the class. In the case of Abstract class, it is the first layer, and its subclasses which are the concrete classes are the second layer, and finally, the user class is in the third layer. So in the 2nd layer, the subclasses must implement the abstract method. It means that you will fill the blank.

Number 4, Abstract method must be implemented.

Number 3, Abstract class Can Have Constructor.

Number 2, Abstract class Cannot Be Final.

Number 1. Abstract class Is Not Mandatory.


Here are the top 10 facts that you should know about Abstract class in Java.

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Programming WTF: When EXACTLY to use an Abstract Class? Java & Kotlin Interfaces vs Abstract Classes

A viewer asked a question about why I preferred to use an Abstract Class over an Interface in an older video on the Open/Closed Principle, and I thought I would use this opportunity to explain exactly why I think yuo should use an Abstract Class over an Interface. Although the original video was about a Java example, you can apply this same principle to Kotlin. Just be aware that Kotlin also has Extension Functions, which are often a great substitute for Abstract Classes!

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Abstract Class Vs Interface In C#

Learn about Abstract Class and Interface. In this video you will learn about the differences and similarities between interface and abstract classes.
This video contains illustrative examples of both Interface and Abstract Classes.
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Difference Between Abstract Class And Interface in Java |when to use what?

In this video you will talk about Difference Between Abstract Class And Interface in Java and Which should you use, abstract classes or interfaces?
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Difference between Interface and Absract Class

Java interview questions and answers on abstract class , Interface with examples.

Learn:
What is abstract class?
What is interface?
What is the use of abstract class and interface?
When to use Abstract class and when to use interface?
What is the difference between abstract class vs interface?

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When to use abstract class and interface in Java

In this video you will learn what is abstract and interface and in which scenario we used abstract class and interface in real time

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Java - OOP Basics - 5/5 (Abstract Classes)

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Java - Interface and Abstract class Loopholes Part-6 || Abstract class Vs Interface

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Lecture 26 Difference between Abstract class and Interface in Java Hindi

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Implementation of Abstract class, Difference between abstract class and interface

This video consists of how to create abstract class in java and uses of abstract class. Also use of this and super keyword. Also this video contains creation of interface and difference between Abstract and interface and demo.

When to use Abstract class and When to use Interface in Java

Please check out my blog( for more technical videos.
For any java/devops/developer/lead position related mock interview assistance/Guidance/ support, you can reach out me @ sivajavatechie5@gmail.com

In this session, I explained java interview questions and answers on abstract class , Interface with examples.

By end of this session, You will be able to answers to below questions:
What is abstract class?
What is interface?
What is the use of abstract class and interface?
When to use Abstract class and when to use interface?
What is the difference between abstract class vs interface?

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