Lesson 6 Practice — Employee Hierarchy

Create:

ZCL_EMPLOYEE_BASE_###
ZCL_SALARIED_EMPLOYEE_###
ZCL_CONTRACTOR_###
ZCL_ABAP_L06_PRACTICE_###

Base Employee owns common:

id
name

Subclasses add:

SalariedEmployee → annual_salary
Contractor       → hourly_rate

Requirements:

• use INHERITING FROM;
• call super->constructor;
• create a REF TO base variable;
• assign a SalariedEmployee object to it;
• call inherited behavior through the base reference;
• repeat with Contractor.

Questions:

1. What is the static type of the reference?
2. What is its dynamic object type after assigning a Contractor?
3. Why is Contractor an acceptable subtype of Employee in this model?
4. When would composition be better than inheritance?