Java Part-24 | Abstract Class in Java (Gujarati)

- There are situations in which you will want to define a super class that declares the structure of a given abstraction without providing a complete implementation of every method.
- Sometimes you will want to create a super class that only defines a generalized form that will be shared by all of its subclasses, leaving it to each subclass to fill in the details.

- Any class containing an abstract method is an abstract class
- You must declare the class with the keyword abstract:
abstract class MyClass {...}
- An abstract class is incomplete, It has “missing” method bodies
You cannot instantiate (create a new instance of) an abstract class
- You can extend (subclass) an abstract class
If the subclass defines all the inherited abstract methods, it is “complete” and can be instantiated
- If the subclass does not define all the inherited abstract methods, it too must be abstract
- You can declare a class to be abstract even if it does not contain any abstract methods
- This prevents the class from being instantiated

- Abstract classes are good for defining a general category containing specific, “concrete” classes
- Any class that contains one or more abstract methods must also be declared abstract.
- To declare a class abstract, you simply use the abstract keyword in front of the class keyword at the beginning of the class declaration.
- There can be no objects of an abstract class.
- That is, an abstract class cannot be directly instantiate d with the new operator.

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