Introduction to Object Oriented Programming

Timothy A. Budd

Chapter 11

Replacement and Refinement

Outline

1. Adding versus Replacing or Refining
2. Two Models - Replacement and Refinement
   1. Replacement Example - sqrt in Smalltalk
   2. Preserving is-a
   3. Documenting Replacement or Refinement
   4. Replacement in C++ - issues
   5. Replacement in C++ - class descriptions
   6. Replacement in C++ - methods
   7. Replacement in Java
   8. Replacement in Object Pascal
      1. Example Declaration in Object Pascal
      2. Methods have no indication in Object Pascal
   9. Replacement in Objective-C and Smalltalk
3. Refinement
   1. Refinement in Simula and Beta
   2. Refinement in C++
      1. Constructors always do refinement
   3. Refinement in Object Pascal
   4. Refinement in Smalltalk, Java and Objective-C

Other Material

• Self Assessment Study Questions
• Virtual and non-virtual overriding in C++

Intro OOP, Chapter 11, Slide 1