Polymorphism in Java Programs

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1. Abstract classes may contain abstract methods, To use an abstract class, you have to inherit it from another class, provide implementations to the abstract methods in it.

2. Abstract classes may not contain abstract methods

3. If a class has at least one abstract method, then the class must be declared abstract.

4. If a class is declared abstract, it cannot be instantiated.

5. If you inherit an abstract class, you have to provide implementations to all the abstract methods in it.

6. Understanding the important scenario of abstract class

7. Understanding the important real world abstract class

8. Abstract class having constructor, data member, methods etc.

9. If you are extending any abstract class that have abstract method, you must either provide the implementation of the method or make this class abstract.