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《面向对象分析与设计》读书摘要与学习笔记（二） |
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作者：未知 来源：月光软件站 加入时间：2005-5-13 月光软件站 |
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The 3 basic kinds of develop method
a. Top-down structured design
b. Data-driven design
c. Object-oriented design
The Object Model
1. First- and Early Second- Generation Programming Language
Data (Most of them are global)
Subprogrammes
Often contains tremendous amount of cross-coupling among subprogramms.
2. Late Second- and Early Third Generation
Data
Subprogrammes
Subprogrammes were appreciated as a way to abstract programme functions.
3. Late Third-Generation
Modules
Date
Subprogrammes
Modules used to group the subprogrammes that were most likely to change together. But most language of this generation required the semantic consistency among module interfaces.
4. Small- to Moderate-Sized Apps Using Object-Oriented Programming Language
The elements is classes and objects. They are well-organized in logic.
5. Large Apps
LayerA
LayerB
LayerC
LayerD
LayerE
Any layer acts as an implementation of the upper layer and abstrction of the lower layer.
A introduction to OOP, OOD and OOA
OOP
The definition: Object-oriented programming is a method of inplementation in which programmes are organized as cooperative collections of objects, each of which represents an instance of some class, and whose classes are all member of a
hierarchy of classes united via inheritance relationships.
OOD
The definition: Object-oriented design is a method of design encompassing the process of object-oriented decomposition and a notation for depicting both logical and physical as well as static and dynamic models of the system under design.
OOA
The definition: Object-oriented analysis is a method of analysis that examines requirements from the perspective of the classes and objects found in the vocabulary of the problem domain.
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