Lesson 1

In this module, you will develop your OOP skills by creating objects from classes. You will learn how to overload methods, how to create instances of classes, and how to override methods in derived classes.
You will practice your OOP skills by creating simple object-oriented Java applications.

Java is an Object-Oriented programming language. As an issue that has the Object Oriented peculiarity, Java underpins the accompanying essential ideas:

1. Inheritance
2. Polymorphism
3. Abstraction
4. Encapsulation
5. Objects
6. Message Parsing
7. Classes
8. Method
9. Instance

In this module, we will investigate the concepts of Classes and Objects. A class can be described as an blueprint that declares and defines the attributes and methods that its objects will implement and use. Objects are simple real world entities that possess a state and its characteritic behaviour. For example, if you consider a real world entity, a labrador dog, then this dog is an object. However, it belong to the class of dogs. Therefore, the associated class is Dog.

Let us now look profoundly into what are objects. In the event that we consider this present reality, we can discover numerous entities around us, Cars, Humans, Dogs and several other. In fact, any real world entity can be modelled as an object. The one common thing between all these entities is the fact that they contain states and behaviours. On the off chance that we consider a dog, then its state is - breed, name and color. However, its behaviour includes eating habits and other characteristics like running and barking.

open class Dogs {
 String breed;
 String shade;
 int age;
 void eating (){ }
 void barking (){ }
}