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Interesting Concept of Object Oriented Programming
The document discusses the concept of inheritance in object-oriented programming (OOP), highlighting its importance in reusability and defining relationships between classes. It explains the is-a relationship and types of inheritance in Java, including single, multilevel, and hierarchical inheritance, while also addressing why multiple inheritance is not supported. The document emphasizes that inheritance allows subclasses to inherit attributes and methods from their superclasses, enabling better code management.
Interesting Concept of Object Oriented Programming
- 1. © Prognoz TechnologiesPvt. Ltd Inheritance
- 2. © Prognoz TechnologiesPvt. Ltd OOP Encapsulation Inheritance Polymorphism Abstraction 4 pillars of OOPS
- 3. © Prognoz TechnologiesPvt. Ltd Inheritance Inheritance is a fundamental Object Oriented concept A class can be defined as a "subclass" of another class. The subclass inherits all data attributes of its superclass The subclass inherits all methods of its superclass The subclass inherits all associations of its superclass
- 4. © Prognoz TechnologiesPvt. Ltd Inheritance(Continue…) When we talk about inheritance, the most commonly used keyword would be extends and implements. Class Class extends Interface Class implements Interface Interface extends
- 5. © Prognoz TechnologiesPvt. Ltd Inheritance(Continue…) These words would determine whether one object IS-A type of another. IS-A Relationship: IS-A is a way of saying : This object is a type of that object. Surgeon IS-A Doctor
- 6. © Prognoz TechnologiesPvt. Ltd Inheritance(Continue…) Now, if we consider the IS-A relationship: 1. Mammal IS-AAnimal 2. Reptile IS-AAnimal 3. Dog IS-A Mammal Hence : Dog IS-AAnimal as well
- 7. © Prognoz TechnologiesPvt. Ltd Inheritance(Continue…) Reusability is achieved by INHERITANCE Java classes Can be Reused by extending a class. Extending an existing class is nothing but reusing properties of the existing classes. The class whose properties are extended is known as super or base or parent class. The class which extends the properties of super class is known as sub or derived or child class A class can either extends another class or can implement an interface
- 8. © Prognoz TechnologiesPvt. Ltd Example
- 9. © Prognoz TechnologiesPvt. Ltd Why use inheritance in java For Method Overriding (so runtime polymorphism can be achieved). For Code Reusability.
- 10. © Prognoz TechnologiesPvt. Ltd Types of inheritance in java On the basis of class, there can be three types of inheritance in java: Single, multilevel and hierarchical. In java programming, multiple and hybrid inheritance is supported through interface only.
- 11. © Prognoz TechnologiesPvt. Ltd Various Forms of Inheritance A B Single Inheritance Hierarchical Inheritance X A B C Multilevel Inheritance A B C A B C Multiple Inheritance NOT SUPPORTED BY JAVA A B C A C Hybrid Inheritance
- 12. © Prognoz TechnologiesPvt. Ltd Why multiple inheritance is not supported in java? To reduce the complexity and simplify the language, multiple inheritance is not supported in java. Consider a scenario where A, B and C are three classes. The C class inherits A and B classes. If A and B classes have same method and you call it from child class object, there will be ambiguity to call method of A or B class.
- 13. © Prognoz TechnologiesPvt. Ltd Thank you!! 13