Java abstract class tutorial | Java abstract class program examples

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******************** Java Abstract class:
→ An abstract class in Java is a class that is declared abstract.
→ Abstract classes cannot be instantiated, but they can be subclassed.
→ A class which is declared with abstract keyword.
→ It can have abstract and non-abstract methods.

Abstract class Syntax:
→ abstract class abstractClassName{}

Example:
Step 1:
Create an abstract class by using the below example
abstract class AbstractArea

{

public void getWelcomeMessage()

{

System.out.println("Welcome to abstraction")

}

public abstract void area()

}

Step 2:
Create a class SquareArea that extends Abstract class (AbstractArea) using the below example
class SquareArea extends AbstractArea

{

@Override

public void area()

{

System.out.println("Finding area of a square")

}

}

Step 3:
Create a class RectangleArea class that extends AbstractArea (abstract class) using the below example
class RectangeArea extends AbstractArea

{

@Override

public void area()

{

System.out.println("Finding area of Rectangle")

}

}
}



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