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Abstract Class and Abstract Method in Java with Solved Example
In this lecture we will learn about Abstract Class and Abstract Method in Java with Solved Example.
Java Abstract Class
An abstract class is a class that cannot be instantiated (we cannot create objects of an abstract class). In Java, we use the abstract keyword to declare an abstract class.
Java Abstract Method
We use the same keyword abstract to create abstract methods. An abstract method is declared without an implementation.
Inheritance of Abstract Class
An abstract class cannot be instantiated. To access the members of an abstract class, we must inherit it.
Overriding of Abstract Methods
In Java, it is mandatory to override abstract methods of the superclass in the subclass. It is because the subclass inherits abstract methods of the superclass.
Accesses Constructor of Abstract Classes
Similar to non-abstract classes, we access the constructor of an abstract class from the subclass using the super keyword.
Why Java Abstraction?
Abstraction is an important concept of object-oriented programming. Abstraction only shows the needed information and all the unnecessary details are kept hidden. This allows us to manage complexity by omitting or hiding details with a simpler, higher-level idea.

A practical example of abstraction can be motorbike brakes. We know what brake does. When we apply the brake, the motorbike will stop. However, the working of the brake is kept hidden from us.

The major advantage of hiding the working of the brake is that now the manufacturer can implement brake differently for different motorbikes, however, what brake does will be the same.
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