Object Oreinted Programming OOP

Object stores its state in fields(fields represent the object stats),and exposes its behavior through methods.and data encapsulation It can’t be accessed if it is private.

Uses:

• Object
• Class
  • Public
  • Private
  • Protected

    All of them depends on type of class.

• Inheritance

  Using inheritance when i needed to access the parameter used in parent class but should have a public or protected data type and if it protected can’t used in the main.

  Or Inheritance we use it when we creat class need same fields or same functions.extends , class MyClass extends MySuperClass

• Package

  Package allow to keep HTML pages in one folder, images in another, and scripts or applications in yet another same the folder in computers.

• Interface

How to declare the Class

public class Read4{
    public static void main(String[] args){
        System.out.print("Ali Shiyyab");
    }
}

• Declaring Member Variables depends on the modifires type like public or private.

• Overloaded can declear the method with same name but with deffirent arguments.

• Constructors : can create one defult constructur without arguments.

• Decimal Numbers : all digin in it has position and the decimal knows us which position.(Base 10)

• Binary Numbers: Base 2start counting at 0, then 1, then you run out of digits.

• Hexadecimal Numbers: Base 16 start from 0 to 9 then continue with A,B,C,…