Defining a Class

                A class is a user defined data type. It contains data and its related methods. The general form is

class classname {      Datatype field-1;       ……………………….      Datatype field-n;      Datatype methodname-1(parameter list)      {            Body of the method       }      ………………………..      Datatype methodname-n(parameter list)      {           Body of the method      } }

Where

                class                       -              keyword

                classname           -              user defined name

                datatype              -              available data types such as int,long etc.

Rules

1. The fields and methods defined inside a class are called instance variable and instance methods.

2. The fields and methods declared within a class are called members of a class.

3. The fields and methods definition are all optional.

4. The class can be empty.

5. It is better to write the first letter of the class name in capital letter.