Abstract Class In Java | Java Abstract Class Tutorial | Java Tutorial For Beginners | Simplilearn
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The document discusses abstract classes in Java, defining them as templates for methods and variables that cannot be instantiated directly. It outlines features, rules for declaration, procedures to achieve abstraction, and contrasts abstract classes with interfaces, highlighting their advantages such as code reusability and disadvantages like potential complexity. Overall, it serves as a comprehensive guide to understanding the concept and implementation of abstract classes in object-oriented programming.
Abstract Class In Java | Java Abstract Class Tutorial | Java Tutorial For Beginners | Simplilearn
- 2. What is an Abstract Class? Features of Abstract Classes Rules to declare Abstract Classes Procedure to achieve Abstraction in Java The Syntax for Abstract Classes Examples for Abstract Classes Advantages of Abstract Classes Disadvantages of Abstract Classes Interface v/s Abstract Class Interface Agenda
- 3. What Is an Abstract Class?
- 4. Click here to watch the video
- 5. What Is an Abstract Class? Abstract class in Java is considered as a template of methods and variables used in a program. Abstract classes cannot be instantiated directly.
- 6. Features of Abstract Classes
- 7. Features of Abstract class Template Loose Coupling Code Reusability Abstraction Dynamic Resolution
- 8. Rules to Declare an Abstract Class
- 9. Rules to Declare an Abstract Class • The keyword “abstract” is mandatory. • Abstract classes cannot be instantiated. • An abstract class must have at least one abstract method. • An abstract class includes final methods. • An abstract class may also include non-abstract methods. • Abstract class can include constructors and static methods.
- 10. Procedure to Achieve Abstraction Procedure
- 11. Procedure to Achieve Abstraction Abstraction is one of the fundamentals of Object-oriented programming. Abstraction can be achieved by following either of the two below mentioned procedures. • Using an Interface • Using an Abstract Class Procedure
- 12. The Syntax for Abstract Classes
- 13. Syntax of Abstract Class Abstraction can be achieved by following the syntax mentioned below. abstract class Simplilearn{} abstract void Simplilearn();
- 14. Interface
- 15. Interface Interface can be defined as a boundary between the method and the class implementing it. In Java, we use interface to achieve abstraction
- 16. Syntax of Interface Abstraction can be achieved by following the syntax mentioned below. interface Simplilearn{}
- 17. Examples for Abstract Classes
- 18. Interface V/S Abstract ClassI
- 19. Interface V/S Abstract Class I Interface Abstract Keyword: interface Keyword: abstract Subclasses extend it Subclasses implement it Only one abstract class can be extended Multiple interfaces can be implemented Supports multiple inheritance Does not support multiple inheritance
- 20. Advantages of Abstract Classes
- 21. Advantages of Abstract Class • Highly beneficial in writing shorter codes • Avoids code duplication • Enables code Reusability • Changes to Internal code implementation is done without affecting classes
- 22. Disadvantages of Abstract Classes
- 23. Disadvantages of Abstract Class • Abstraction is expensive as sometimes you need to handle cases and situation which are not necessary sometimes. • Object relational impedance mismatch in case of RDBMS • Object relational Mapping in case of Frameworks like hibernate