CHAPTER 1: Hello, Design Patterns!
14
Figure 1–2. A protocol with abstract operations on the left; an abstract class with both abstract and concrete
operations at the center; and a concrete class with a concrete operation, concrete property, and an instance
variable on the right
Denoting a category is a little tricky because the original OMT doesn’t support category
as of this writing. A category is an extension of a class, but is not a subclass of that
class. So it might be been confusing if I used arrows to illustrate the relationship. I’ve
come up with the notation of augmenting a class box as shown in Figure 1–3.
Figure 1–3. The original class is on the right and its category is augmented on the right.
The original class box is on the left and there’s a similar rectangular box attached to it.
The category name is enclosed in parenthesis and its augmented operations are put in
the lower part of the box just like other classes. This notation may not be the most
flexible notation especially if you have 100 categories in your design. But it is good
enough for the illustrations used in this book.
In a class or object diagram, there can be some other roles that are part of the design.
Those roles could be an abstract entity, such as a client, or some other classes within or
outside the scope of the design. A grayed out round rectangular box denotes an implicit
role that is part of an interaction but isn’t essential to the discussion. Otherwise, a
participant class will be denoted as round rectangle with a solid black border. If this is
an ebook, the background color of a participant class box is light blue while the implicit
one’s background is clear or white (see Figure 1–4).
Figure 1–4 An implicit class on the left and a participating class on the right
剩余371页未读，继续阅读
「已注销」
- 粉丝: 0
- 资源: 5
我的内容管理
展开
最新资源
- Vue实现iOS原生Picker组件：详细解析与实现思路
- Arduino蓝牙小车：参数调试与功能控制
- 百度Java面试精华：200页精选资源涵盖核心知识点
- Swift使用CoreData填坑指南：CoreData在Swift 3.0的变化
- 微距离无线充电器创新设计及其实验探索
- MTK Android平台开发全攻略：44步详解流程
- RecyclerView全面解析：替代ListView的新选择
- Android开发：自动适配中英文键盘解决方案
- Android调用WebService接口教程
- Android开发：BitmapUtil图片处理全解析与实例
- Android多线程断点续传实现详解
- PCA算法在人脸识别会议签到系统中的应用
- EventBus 3.0：Android事件总线详解与实战应用
- Android FileUtil：全面解析文件操作实用技巧与实例
- RecyclerView添加头部和尾部实战教程
- Android实现微博滑动固定顶部栏实战与优化
资源上传下载、课程学习等过程中有任何疑问或建议，欢迎提出宝贵意见哦~我们会及时处理！
点击此处反馈
