Object Oriented Programming CONCEPTS.pdf
- 1. OBJECT ORIENTED Hasanka Wijesinghe PROGRAMMING MIT, B.Sc Programming Design Techniques and Programming
- 2. Content Class and Methods Access Modifiers Object Oriented Concepts DSE004 Hasanka Wijesinghe
- 3. Java Class and Methods DSE004 Hasanka Wijesinghe
- 4. Java Methods DSE004 Hasanka Wijesinghe Method type Methods with return type Methods without return type Methods with return type Methods without return type
- 5. Java Object Creation DSE004 Hasanka Wijesinghe In Java, objects are instances of classes, and you create objects using the new keyword along with a constructor. Class Object
- 6. Access Modifiers DSE004 Hasanka Wijesinghe Public The most permissive access level. Public members are accessible from any other class.
- 7. Access Modifiers DSE004 Hasanka Wijesinghe Private The most restrictive access level. Private members are only accessible within the same class.
- 8. Protected Members are accessible within the same class, subclass (even if the subclass is in a different package), and package. Not accessible outside the package unless there is an inheritance relationship. Access Modifiers DSE004 Hasanka Wijesinghe
- 10. Object Oriented Programming Concepts Encapsulation Encapsulation is the bundling of data and methods that operate on the data into a single unit known as a class. Polymorphism Polymorphism means "many forms" and refers to the ability of objects to take on multiple forms. Inheritance Inheritance is a mechanism that allows a class to inherit properties and behaviors from another class Abstraction Abstraction is the process of simplifying complex systems by modeling classes based on the essential properties and behaviors they possess. DSE004 Hasanka Wijesinghe
- 11. Encapsulation is a way to restrict the direct access to some components of an object Encapsulation can be used to hide both data members and data functions or methods associated with an instantiated class or object. Encapsulation DSE004 Hasanka Wijesinghe
- 12. Consider a class representing a bank account. Apply encapsulation principles to design the class with private attributes such as account number, balance, and owner's name. Provide public methods to deposit and withdraw funds while ensuring that the balance cannot be accessed or modified directly. Demonstrate the usage of encapsulation in your solution. Encapsulation DSE004 Hasanka Wijesinghe
- 13. Inheritance is a mechanism that allows a class (subclass or derived class) to inherit properties and behaviors from another class (superclass or base class). It promotes code reuse and establishes a relationship between classes, facilitating the creation of a hierarchical structure. Inheritance DSE004 Hasanka Wijesinghe
- 14. Inheritance DSE004 Hasanka Wijesinghe Super Class / Parent Class Sub Class / Child Class
- 15. In object-oriented programming (OOP), polymorphism is the concept that an entity in code can have more than one form. In Java, polymorphism is achieved through method overloading and method overriding. Method Overloading: Multiple methods with the same name but different parameter lists. Method Overriding: A subclass provides a specific implementation of a method that is already defined in its superclass. Polymorphism DSE004 Hasanka Wijesinghe
- 17. Abstraction involves simplifying complex systems by modeling classes based on the essential properties and behaviors they possess. Abstraction can create a clear separation between the interface (what the object does) and the implementation (how it does it). This separation enhances modularity, making it easier to maintain and update the system. It helps break down a large, complex problem into smaller, more manageable components. Abstraction DSE004 Hasanka Wijesinghe
- 19. THANK YOU! DSE004 Hasanka Wijesinghe