#61 Abstract Keyword in Java

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In this lecture we will learn:
What is Abstraction?
Abstract method in Java
Abstract class in Java
Abstract vs Concrete classes
#1
Abstraction is a process of hiding the implementation details and showing only functionality to the user.
#2
Abstract method:-
Instead of defining the method, we can declare the method.
If we put a semicolon at the end of a method, it means that you only declare the method like:
public void drive();
This method does not contain any features and you will not be able to create an object of it.
You need to add an abstract keyword to only declare a method.
#3
Abstract class:-
Abstract methods can only be defined in an abstract class.
We need to add an abstract keyword before a class to make it an abstract class.
Objects of an abstract class can not be created.
If you are extending an abstract class, then it is compulsory to define all abstract methods.
It is not necessary that an abstract class should have an abstract method.
Abstract class can have an abstract or a normal method or both.
An abstract class can have more than one abstract method.
#4
Concrete class: A class other than an abstract class is known as a concrete class.
An object of a concrete class can be created.
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we as a community must create a abstract class called "teachLikeNavin" and every teacher must extend it so that the world develop much faster.

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Thanks, Navin, for your clear explanation of Abstract class. It really helped me understand.

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This is the best explanation ever on this topic! Thanks so much.

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[@SaiKiranNagulapalli00]

Key Points :
We use abstract when we want to define but don't want to implement .
Abstract methods can be part of only Abstract classes (but not vice versa).
We cannot directly create an object from Abstract Class.
We can extend abstract class and all abstract methods should be implemented then only we can use if we cant implement all abstract methods then we should make the class abstract hence we cannot create an object using the class.

[@VivekSingh-zh3co]

Best and simple explanation of all time...

[@ajayghode3602]

Thank You
Point to remember: we can't create object of abstract class. Abstract method must be defined in the abstract class.
concrete class- we defined abstract methods.

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thank you, best explanation ever about abstract/concrete classes!

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There is not even a 1% that i didn't understood
Perfect 👍

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8:45 “ fast and furious ”😂

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So good tutorial thank you

[@PrudviAlla]

Hi Navin, I have a doubt. There should be one abstract method inside the abstract class to call it an abstract class right? Correct me if i am wrong.
Thank you

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Thank you . Well explained

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Thank you

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Thanks a lot!

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ur laughing is beautiful sir😜

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Why we refer object as Car obj = UpdatedWagonR () and why not, UpdatedWagonR obj= UpdatedWagonR(); ?

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U can do that too

[@roopad2031]

When a class is abstract without any abtract methods and having only normal methods. Then how to access those methods as we cannot create an obj for abstract class.. please clarify this Navin

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Create a dummy class that extends the abstract class.

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Sir absract class implements interfaces sir?

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I can recall Pure virtual function in C++

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what is the use of this topic and its applications

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Thank you ☺️

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What if we java a final method / class ?

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Well explained. Easy to understand. I just have one doubt,
why do you add the "x:" while Printing anything?

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it's default from the IDE - vscode extension

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the movie name is Fast & Furious :p

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Sir why wagonR why not Gwagon

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VS code

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Why can we not create the method drive in the wagonR method rather than declaring it in the parent abstract class. Then we wont need to have the concept of abstract . Can someone pls explain ...

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Suppose u create a shooting game in which u must have a gun which has some properties and function. Like shooting damage recoil control. In abstract class u create only method for gun but not defined and other class must have to override it and create a method for this according to guns like akm has different properties. Now suppose in new update u introduced a new gun with different functions now its compulsory to u to override parent class method and define it again according to your new gun. I hope u understand this example.

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Vs Code

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6:50

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