Object Oriented ABAP

Demo program illustrating Simple class and Super
class
*&---------------------------------------------------------------------*
*& Report Z_OOABAP18 *
*& *
*&---------------------------------------------------------------------*
*& *
*& *
*&---------------------------------------------------------------------*
REPORT Z_OOABAP18 .
CLASS lcl_employee DEFINITION.
PUBLIC SECTION.
*--------------------------------------------------------------------
* The public section is accesible from outside
*--------------------------------------------------------------------
TYPES:
BEGIN OF t_employee,
no TYPE i,
name TYPE string,
END OF t_employee.
METHODS:
constructor
IMPORTING im_employee_no TYPE i
im_employee_name TYPE string,
display_employee.
* Class methods are global for all instances
CLASS-METHODS: display_no_of_employees.
PROTECTED SECTION.
*--------------------------------------------------------------------
* The protected section is accessible from the class and its subclasses
*--------------------------------------------------------------------
* Class data are global for all instances
CLASS-DATA: g_no_of_employees TYPE i.
PRIVATE SECTION.
*--------------------------------------------------------------------
* The private section is only accessible from within the classs
*--------------------------------------------------------------------
DATA: g_employee TYPE t_employee.
ENDCLASS.
*--- LCL Employee - Implementation
CLASS lcl_employee IMPLEMENTATION.
METHOD constructor.
g_employee-no = im_employee_no.
g_employee-name = im_employee_name.
g_no_of_employees = g_no_of_employees + 1.
ENDMETHOD.
METHOD display_employee.
WRITE:/ 'Employee', g_employee-no, g_employee-name.
ENDMETHOD.
METHOD display_no_of_employees.