🔴Abstraction in java | abstract class and methods | use of abstract class and abstract methods
In this video, I explained and showed what is abstraction in java and what is the abstract class and methods in java and their usages.
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Topics Covered In this Video
0:00:00 Introduction about Abstraction
0:02:30 Real life Example
0:10:00 How many ways we can achieve abstraction in java
0:13:00 abstract class & abstract methods syntax
0:20:30 abstract class creation in Eclipse
0:28:00 why we use abstract class&methods
0:32:00 how to implement abstract methods
0:38:00 can we create objects of an abstract class?
0:50:00 sub class also abstract class
1:01:00 static methods & variables & Constructors
1:15:00 Conclusion
1:16:00 0 to 100% why we say
Abstraction in java
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Abstraction is a process of hiding the implementation details and showing only functionality to the user
Abstraction is a process where you show only “relevant” data and “hide” unnecessary details of an object from the user.
Ex :- TV Remote, Car
why & Usage :- Security
Key Points to Remember
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We use the abstract keyword to create abstract classes and methods.
An abstract method doesn't have any implementation (method body).
A class containing abstract methods should also be abstract.
We cannot create objects of an abstract class.
To implement features of an abstract class, we inherit sub classes from it and create objects of the subclass.
A subclass must override all abstract methods of an abstract class. However, if the subclass is declared abstract, it's not mandatory to override abstract methods.
We can access the static attributes and methods of an abstract class using the reference of the abstract class.
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