OOP LESSON 1.pdf

OOP CONCEPTS MARY ROSE C. COLUMBRES Bulacan State University - Sarmiento Campus OBJECTIVES: At the end of this lesson, you should be able to: Discuss the six key OOP concepts; Explain all examples of six key OOP concepts; and Identify abstract classes and Interface THE SIX KEY CONCEP...

OOP CONCEPTS MARY ROSE C. COLUMBRES Bulacan State University - Sarmiento Campus OBJECTIVES: At the end of this lesson, you should be able to: Discuss the six key OOP concepts; Explain all examples of six key OOP concepts; and Identify abstract classes and Interface THE SIX KEY CONCEPTS OF OOP 1) Objects 2) Classes 3) Abstraction 4) Inheritance 5) Encapsulation 6) Polymorphism 1. OBJECTS AND 2. CLASSES Object – it is anything that represents “things” in the real world. Two components 1) Attributes – characteristics that define an object. 2) Methods – it is a self-contained block of program code that is similar to a procedure or function. Example: Car’s Attribute Method Model Name Forward Year Backward Purchase Price Break https://www.pawangaria.com/post/java/object-oriented-programming-concepts/ Car Attributes Car Methods  Model Steer  Color StepOnBreak  BrandName StepOnGasPedal 1. OBJECTS AND 2. CLASSES  Classes  itis a term that describes a group or collection of objects with common properties (both attributes and methods).  It is an abstract description of an object – a general plan or blueprint for an object.  It specifies methods and data that type of object has. Example: 1) Employee 2) Car  3. ABSTRACTION It allows a programmer to hide all but the relevant information about an object in order to reduce complexity and increase efficiency. Closely related to encapsulation and information hiding.  3. ABSTRACTION https://www.quora.com/Why-to-use-abstraction-in-Java https://www.slideshare.net/bobrenjc93/lesson-203-18-sep131500ay  4. ENCAPSULATION Refers to the hiding of data (attributes) and methods within an object. It hides the details of an object’s internal implementation from the users of an object. It is important, because it separates how an object behaves from how it is implemented. Advantage of Encapsulation  It protects an object’s data from corruption  It protects the object’s data from arbitrary and unintended use.  It is easier to modify programs using encapsulation, because one object type is modified at a time  4. ENCAPSULATION https://techvidvan.com/tutorials/java-encapsulation/  5. INHERITANCE  Itis the process by which objects can acquire (inherit) the properties of objects of another class.  It provides reusability, like adding additional features to an existing class without modifying it. This is achieved by deriving new class called subclass or derive class.  5. INHERITANCE https://www.edureka.co/blog/object-oriented-programming/ https://codestall.wordpress.com/2017/09/20/inheritance-in-java/  6. POLYMORPHISM  Refers to the ability to process objects differently depending on their data type or class.  It is the ability to redefine methods from derived classes.  Can request for an operation without knowing which specific method should be invoked. These implementation details are hidden from the user.  6. POLYMORPHISM https://techvidvan.com/tutorials/java-polymorphism/  ABSTRACT CLASSES  It is class that is not used to create (instantiate) objects.  It is designed to act as a base class (to be inherited by other classes).  It is a design concept in program development and provides a base upon which other classes are built.  It can only specify members that should be implemented by all inheriting class. ABSTRACT CLASSES https://www.tes.com/lessons/LQrtpNuBqW4gxA/animal-classification  INTERFACE  It allow you to create definitions for component interaction.  It provide another way of implementing polymorphism.  It specify methods that a component must implement without actually specifying how the method is implemented.  INTERFACE https://javatutorial.net/java-interface-example Quote of the day