Class in java

A class is a non-primitive datatype that contains member variables (data) and member functions (methods) that operates on the variables.  A class is declared by the use of the class keyword.  The general form of class definition is as follows.

            Syntax:            class class-name

                                    {

                                                datatype instance-variable1;

                                                datatype instance-variable2;

                                                -

                                                -

                                                datatype instance-variablen;

                                                datatype methodname1(parameter-list)

                                                {

                                                // method body

                                                }

                                                -

                                                -

                                                datatype methodnamem(parameter-list)

                                                {

                                                // method body

                                                }

                                    }

            The data, or variables defined with in a class are called instance variables.  The code is present with in methods.  Collection of methods and variables defined with in a class are called members of the class.

            Example:         class box

                                    {

                                    double width, height, depth;

                                    double volume( )

                                    {

                                    return width*height*depth;

                                    }

                                    }