Abstract Class Presentation
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The document discusses abstract classes and concrete classes in Java. It defines an abstract class as a class marked with the abstract keyword that can contain abstract methods without an implementation. Concrete classes must implement the abstract methods and provide a basic implementation. The document includes an example abstract class program and concrete class program to demonstrate the relationship between the two, where the concrete class inherits from and implements the abstract class.
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- 1. Presentation Presented by: Ghazanfar Ali (FA15-BEE-012) Topic: Abstract Class and Concrete Class
- 2. Contents: Abstract Class Abstract Class Program Concrete Class Concrete Class Program Relation between Abstract Class and Concrete Class Program output
- 3. Abstract Class Abstract class is just like other classes but it marks with abstract keyword. Classes that contain one or more abstract methods An abstract method is that which is declared but contains no implementation. A method can be made abstract if we add the keyword “abstract” to it Abstract classes may not be instantiated, and require subclasses to provide implementations for the abstract methods These subclasses are also known as child class or derived class. Now here is a simple program of an Abstract class
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- 6. Concrete Class Default class in java A derived class that provides the basic implementations for all of the methods that are not already implemented in the base class. The concrete class is the implementation of an abstract class methods. We can also call concrete methods of abstract class in concrete class objects.
- 8. Why we use Concrete Class? The implementation of an Abstract class. In concrete class (child or derived class) you can call the methods of abstract class by overriding the methods of abstract class and then in main method we call the objects of concrete class which gives us the implementation of abstract class.
- 9. Test Class
- 10. Output
- 11. Relation Between Abstract and Concrete Class So Parent Class Child Class