Objected Oriented Programming Concepts

OOPS is completely based on the concepts that are applicable in our day today life so that it is   named as Object Oriented Programming System.

Object Oriented with real time example:-

As u know Object is the instance of class, Let consider ‘U’ (Sagar) as object where as ‘U’ belongs to the ‘Human being’ category and Every Human being has so many properties Name, Address and Gender etc..

Convert the same in Java programming language.

Class HumanBeing() {
String name;
String address;
String Gender;
Integer age;

}
HumanBeing Sagar = new HumanBeing(); 

Next consider relation and interaction between different classes and Objects.

 Scenario 1: Ur mom told u brings ‘Onion’  from Vegetables market. Where U and Mom are the Objects belongs to the ‘HumanBeing’ Class and ‘Vegetables’ Market is another class have properties vegetable name, price, quantity and quality.

Java:

Class HumanBeing() {

String name;

String address;

String Gender;

Integer age;

//etc....
}

HumanBeing U/mom = new HumanBeing();

 Class Vegetables() {

String vName;

String quality;

String quantity;

String marketAddress;

Integer price;

//etc....

}
Vegetables onion = Vegetables();

Scenario 2: Before ur mom told u about the vegetables U and ur mom should know the Onion details how it looks, price and types of quality, this creates relation between Humanbeing and Vegetables class.

Java:

Class HumanBeing() {

String name;
String address;
String Gender;
Integer age;
Vegetables   vName;

//etc....

}

HumanBeing U/mom = new HumanBeing();

      Same real time concepts oops is using and consider to go to market u should know the where market is and also should have money to buy. So lets make little complex  if u don’t have money or doesn’t known the market address  then first u have find out the address of the market  by known resources (interaction with other classes), after that u have to go to get money from Bank, ATM or ur Father these are different level of interaction and commonsense in real life .  So that oops used so many properties and concepts like inheritance, Overloading etc to define real time interaction and relation.

Java:

Class HumanBeing() {
String name;
String address;
String Gender;
Integer age;
Vegetables   vName;
Bank nBank;
AtmMoney atm;

//etc....

}

HumanBeing U = new HumanBeing();

Class Bank/AtmMoney(){
String bName;
String bAddress;

//etc....
}