Association - Multiplicity. UML and Classes, Objects and Relationships [ 2] Notes. Notes. Association - Self. Association - Self

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1 - Multiplicity UML and Classes, Objects and Relationships [ 2] Defining Domain Models Using Class Diagrams A can take many Courses and many s can be enrolled in one Course. Alice: takes * * 254: Course Course Jill: 253: Course 2 Notes One class can be relate to another in a One-to-one One-to-many One-to-one or more One-to-zero or one One-to-a bounded interval (one-to-two through twenty) One-to-exactly n One-to-a set of choices (one-to-five or eight) Notes Multiplicity can be expressed as, Exactly one - Zero or one Many - 0..* or * One or more - Exact Number - e.g or 6 Or a complex relationship e.g. 0.., 3..4, 6..* would mean any number of objects other than 2 or Self - Self An association that connects a class to itself is called a self association. A Company has Employees. A single manager is responsible for up to 0 workers. Responsible for manager 0..0 Employee worker 5 6

(one-to-two through twenty) One-to-exactly n One-to-a set of choices (one-to-five or eight) Notes Multiplicity can be expressed as, Exactly one - Zero or one - 0.. Many - 0.

2 - Multiplicity Team Member 0 A cricket team has players. One of them is the captain. A player can play only for one Team. The captain leads the team members. Player Captain Captain 0.. member of Team Leads 7 8 (Inheritance) (Inheritance) e.g. Child class is a special case of the parent class SuperClass Graphic SubClass SubClass2 9 0 Inheritance - Implementation Abstract Class public class { Shape public class Graphic extends { Rectangle 2

. member of Team Leads 7 8 (Inheritance) (Inheritance) e.g.

3 Abstract Methods (Operations) Shape Abstract class and method Implementation public abstract class Shape { public abstract ; //declare without implementation Rectangle public class { public { Interface Interface is a set of operation the class Keyboard brandname numofkeys ctl() pagedown() carries out <<interface>> TypeWriter keystroke() OR Keyboard brandname numofkeys ctl() pagedown() TypeWriter Implementation public interface TypeWriter { void keystroke() public class KeyBoard implements TypeWriter { public void keystroke(){ 7 8

.. 3 4 - Interface Interface is a set of operation the class Keyboard brandname numofkeys ctl() pagedown() carries out <<interface>>

4 cont Change in specification of one class can change the other class. This can happen when one class is using another class. Move(p:Point) Point relationship can be used to show relationships between classes and objects. < <instanceof> > < < instanceof> > circlea: circleb: 9 20 Class Diagrams The UML class diagram consists of several Classes, connected with Relationships. 2 Draw a class diagram for a information modeling system for a school. has one or more s. offers one or more Subjects. A particular subject will be offered by only one department. has instructors and instructors can work for one or more departments. can enrol in upto 5 subjects in a. Instructors can teach upto 3 subjects. The same subject can be taught by different instructors. s can be enrolled in more than one school. 22 has one or more s. has offers one or more Subjects. A particular subject will be offered by only one department. has Instructors and instructors can work for one or more departments. Instructor assigned to can enrol in upto 5 Subjects. offers Subject takes * 0..5 Subject 23 24

< <instanceof> > < < instanceof> > circlea: circleb: 9 20 Class Diagrams The UML class diagram consists of several Classes, connected with Relationships.

5 Instructors can teach up to 3 subjects. The same subject can be taught by different instructors. s can be enrolled in more than one school. Instructor teaches..3 Subjects * member Class Diagram Example Object Diagram * member has offeres assignedto Object Diagram shows the relationship between objects. Unlike classes objects have a state. * attends teaches Subject Instructor * Object Diagram - Example c: Company d: name= Sales d2: name= R&D manager p: Persont name= John employee p2: Person name= David 29

.3 Subjects * member 25 26 Class Diagram Example Object Diagram * member has offeres assignedto Object Diagram shows the

ATM Case Study OBJECTIVES. 2005 Pearson Education, Inc. All rights reserved. 2005 Pearson Education, Inc. All rights reserved.

ATM Case Study OBJECTIVES. 2005 Pearson Education, Inc. All rights reserved. 2005 Pearson Education, Inc. All rights reserved. 1 ATM Case Study 2 OBJECTIVES.. 3 2 Requirements 2.9 (Optional) Software Engineering Case Study: Examining the Requirements Document 4 Object-oriented design (OOD) process using UML Chapters 3 to 8, 10