What are Abstract Classes in Java | Edureka
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Abstract classes in Java serve as a boundary between implementation and functionality, facilitating method exchange and code reuse while promoting dynamic method resolution and loose coupling. They can contain both abstract and non-abstract methods, constructors, and static methods, and must be declared with the 'abstract' keyword. In contrast to interfaces, abstract classes can have private members and implement interfaces, while interfaces can only contain abstract methods and public members.
What are Abstract Classes in Java | Edureka
- 1. Copyright © 2017, edureka and/or its affiliates. All rights reserved.
- 2. WHY WE NEED ABSTRACT CLASSES IN JAVA? RULES FOR ABSTRACT CLASSES IN JAVA www.edureka.co WHAT ARE ABSTRACT CLASSES IN JAVA? WAYS TO ACHIEVE ABSTRACTION IN JAVA THE SYNTAX FOR ABSTRACTION IN JAVA PRACTICAL EXAMPLES OF ABSTRACT CLASSES ABSTRACT CLASS VERSUS INTERFACE
- 3. WHAT ARE ABSTRACT CLASSES IN JAVA? www.edureka.co
- 4. WHAT ARE ABSTRACT CLASSES IN JAVA? www.edureka.co Abstract Classes in Java act as a boundary between the implementation method and its functionality. It is used to exchange the functionality between the Concrete class members and the Abstract Class method.
- 5. WHY WE NEED ABSTRACT CLASSES IN JAVA? www.edureka.co
- 6. Dynamic Method Resolution Loose Coupling Separates Method Definition Code Reuseability Template Default Functionality WHY WE NEED ABSTRACT CLASSES IN JAVA? www.edureka.co
- 7. RULES FOR ABSTRACT CLASSES IN JAVA www.edureka.co
- 8. It can have Constructors and Static Methods also It can have Abstract and Non-Abstract Methods An Abstract Class must be declared using Abstract Keyword It can have Final Methods It cannot be Instantiated RULES FOR ABSTRACT CLASSES IN JAVA www.edureka.co
- 9. WAYS TO ACHIEVE ABSTRACTION IN JAVA www.edureka.co
- 10. WAYS TO ACHIEVE ABSTRACTION IN JAVA The process of Abstraction in Java can be achieved by the following two methods as mentioned below: 1. Implementing an Abstract Class 2. Implementing an Interface www.edureka.co
- 11. SYNTAX FOR ABSTRACTION IN JAVA www.edureka.co
- 12. SYNTAX FOR ABSTRACTION IN JAVA www.edureka.co Abstract Class: abstract class edureka{} Abstract Method: abstract class method();
- 13. PRACTICAL EXAMPLES FOR ABSTRACT CLASS www.edureka.co
- 15. AREA OF RECTANGLE AND CIRCLE www.edureka.co
- 16. ABSTRACT CLASS VERSUS INTERFACE www.edureka.co
- 17. ABSTRACT CLASS VERSUS INTERFACE Abstract Class can have Abstract and Non-Abstract methods Interface can have only Abstract Methods www.edureka.co
- 18. ABSTRACT CLASS VERSUS INTERFACE Abstract Class includes Non-Final Variables Interface has only Final Variables www.edureka.co
- 19. ABSTRACT CLASS VERSUS INTERFACE Abstract class has Static, Non-Static, final, Non-Final variables Interface has Static and Final variables only www.edureka.co
- 20. ABSTRACT CLASS VERSUS INTERFACE Abstract class can implement an Interface Interface will not implement the Abstract Class www.edureka.co
- 21. ABSTRACT CLASS VERSUS INTERFACE Abstract class is implemented using “extends” Keyword Interface is implemented using “implements” Keyword www.edureka.co
- 22. ABSTRACT CLASS VERSUS INTERFACE Abstract classes can extend Java Classes and Interfaces Interface can extend only an Interface www.edureka.co
- 23. ABSTRACT CLASS VERSUS INTERFACE Members can be Private and Protected in an Abstract Class Members are Public by default in an Interface www.edureka.co
- 25. www.edureka.co