This document discusses key concepts in class and method design including coupling, cohesion, encapsulation, inheritance, polymorphism, and design criteria such as coupling and cohesion. It describes activities for object design such as specifying additional details, identifying reuse opportunities, and restructuring designs. It also covers defining constraints and contracts, and creating method specifications in structured English or pseudocode.

1. Chapter 9: Class and Method Design

3. BASIC CHARACTERISTICS OF OBJECT ORIENTATION

7. Polymorphism Example

10. DESIGN CRITERIA

12. Law of Demeter Messages should be sent only by an object: to itself to objects contained in attributes of itself or a superclass to an object that is passed as a parameter to the method to an object that is created by the method to an object that is stored in a global variable

13. Types of Interactive Coupling

15. Types of Method Cohesion

16. Types of Class Cohesion

18. Types of Connascence

19. OBJECT DESIGN ACTIVITIES

26. CONSTRAINTS AND CONTRACTS

28. Invariants on a Class Diagram

30. Elements of a Contract

31. Sample Contract Form

32. METHOD SPECIFICATION

34. Structured English

35. Pseudocode Example (Get CD-info module) Accept (CD_title) {Required} Accept (CD_artist) {Required} Accept (CD_category) {Required} Accept (CD_length) Return