uml 对象技术与可视化建模基础

班机 747 on 11/12
对象的标识
Professor “J Clark” teaches Biology
Professor “J Clark” teaches Biology
对象的状态
一个对象的状态是它反映于现实世界的 一系列属性：
参数的数值 (也就是,与对象有关系的数据) 它与其它对象的关系
Professor Clark’s behavior Submit Final Grades Accept Course Offering Take Sabbatical Set Max Load
TakeSabbatical()
Professor Clark
Sample-An Object
Representing Objects in the UML
Object
Informally, an object represents an entity, either physical, conceptual, or software
Physical entity
Conceptual entity Software entity
化学过程 链表
第2 章 对象技术与可视化建模基础
An Overview of Object Technology and Visual Modeling
Review： An Approach to the Object-Oriented
上升到面向对象
面向对象技术概述
定义、利益、研究内容
面向对象技术发展
历史（里程碑）、现状、未来
Name: J Clark Employee ID: 567138 HireDate: 07/25/1991 Status: Tenured Discipline: Finance MaxLoad: 3
Professor Clark
对象的行为
定义当其它对象发出请求时，该对象如 何反应
由为对象定义的一系列操作决定
The state of an object normally changes over time.
Name: J Clark Employee ID: 567138 Date Hired: July 25, 1991 Status: Tenured Discipline: Finance Maximum Course Load: 3 classes
机票代理
核对出发时间
(返回 9:27)
班机 747
对象的行为
Behavior determines how an object acts and reacts.
The visible behavior of an object is modeled by a set of messages it can respond to (operations that the object can perform).
Properties
Class Employee
Name
Address
Position
Salary
Start Date
End Date
Behavior Hire Fire
Promote Increase Salary
Retire
Representing Classes in the UML
Object-Formal Definition
An object is an entity with a well-defined boundary and identity that encapsulates state and behavior.
Attributes
State is represented by attributes and relationships.
Behavior is represented by operations, methods, and state machines.
Object
Operations
对象的标识
每一个对象都有一个唯一的标识, 即使其 状态有可能与其它对象一样
班机 747 on 11/10
班机 747 on 11/11
An object is an instance of a class.
A class is an abstraction in that it
Emphasizes relevant characteristics. Suppresses other characteristics.
Sample-A源自文库Class
An object is represented as a rectangle with an underlined name.
J Clark : Professor
Named Object
: Professor
Anonymous Object
Class
A class is a description of a set of objects that share the same attributes, operations, relationships, and semantics.
班机 747
可能的状态： 停泊 运营 着陆 终止
对象的状态
State is a condition or situation during the life of an object, which satisfies some condition, performs some activity, or waits for some event.
面向对象与结构化
扬弃而非否定
上升到面向对象
利用面向对象的观点认识客观问题
学习线路图
OO UML
OOA
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:
OOD DP
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… Case-Study …
学习线路图
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Agenda 1
Object and Class Four Principles of OO Generalization and Polymorphism Principles of Visual Modeling The UML Process and visual modeling