Classes Objects and Members

Defining Our Class : The journal syntax of class definition is as follows :

class ClassName extends SuperClassName
{
           [Fields declaration]
           [Method declaration]
}
Everything inside the square bracket is optional.
class Empty
{
}
C++ Programmers may note that there is no semicolon(:) at the end of the class.

Field Declaration : The fields that is declared inside a class is called instance variable because they are created whenever an object of the class is instantiated.
           Instance variable are also known as member variables.

Example :
Class Rectagle
{
           int length;
           int breadth;
}

           Instance member represent attributes and behaviour of individual objects by default all the members of the class and instance member.