Before, moving in depth details of Object oriented and java features, will discuss what an object and class is.
Objects and class in Real World scenario
Object
An Object is a real-world entity. For example, book, cat, box, bus, keyboard, person, screen, cell phone etc., all are objects.
How can we differentiate objects?
1. Depend on their properties
2. Depend on their behaviors
Differentiating two objects based on their properties
Let’s say, there are two persons A and B, we already discussed, each real-time entity is an object. So, these two persons are objects.
First let’s try to find what the possible properties for the person object are
Possible properties for a person
height, weight, color, Education Qualification, country, address are all come under person properties.
Now by comparing these properties we can easily differentiate two persons.
| Property | Person A | Person B |
| Height | 6ft | 5.5ft |
| Weight | 75Kg | 60Kg |
| Color | White | Black |
| Country | India | America |
As shown in the above table, both the persons has their own properties, So we can differentiate based on them.
Differentiating two objects based on their behavior
Consider the same two persons A and B. will try to figure out possible behaviors for the person object
Possible behaviors are
walk, run, swim, eat, sleep, see, hear etc., Now by comparing these behaviors we can easily differentiate two persons.
| Behavior | Person A | Person B |
| walk | 10km/hr | 12km/hr |
| run | 20km/hr | 18km/hr |
| sleep | 8 Hrs/day | 6Hrs/day |
Class
In normal terms I call class as a category.
All persons come under Human category
cat, lion, Elephant come under Animals Category
So a class or category is a group of objects with similar properties and behaviors.
Objects and class in Programming Terminology
What Is an Object?
An object is a software bundle of related state and behavior. The main advantage of java is you can compare objects in Java with real world objects. So it is very easy to work with objects in C#
What Is a Class?
A class is a blueprint or prototype from which objects are created.
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