SE_Lec 07_UML CLASS DIAGRAM
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The class diagram shows the key classes and relationships in a school information modeling system. The main classes are School, Department, Subject, Student, and Instructor. A school has departments and a department offers subjects. A student can enroll in up to 5 subjects and an instructor can teach up to 3 subjects. An instructor is assigned to one or more departments. The class diagram also shows the relationships between these classes such as a student attending a school and taking subjects, and an instructor teaching subjects.
SE_Lec 07_UML CLASS DIAGRAM
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- 2. 2 The class diagram is a static model that shows the classes and the relationships among classes in the system. Class diagrams illustrates classes, interfaces, and their associations. They are used for static object modeling. A Class diagram gives an overview of a system by showing its classes and the relationships among them. Class diagrams display what interacts but not what happens when they do interact
- 3. 3 The main building block of a class diagram is the class, which stores and manages information in the system. A blueprint that an object made from. The class contains two major parts: • Attributes “data members”. • Operations “method members”.
- 4. 4 No arrows; info can flow in both directions Aggregation – Order class contains OrderDetail classes. Could be composition?
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- 9. 9 Class diagrams are great for: discovering related data and attributes getting a quick picture of the important entities in a system seeing whether you have too few/many classes seeing whether the relationships between objects are too complex, too many in number, simple enough, etc. spotting dependencies between one class/object and another Not so great for: discovering algorithmic (not data-driven) behavior finding the flow of steps for objects to solve a given problem understanding the app's overall control flow (event-driven? web- based? sequential? etc.)
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- 11. 11 Draw a class diagram for a information modeling system for a school. School has one or more Departments. Department offers one or more Subjects. A particular subject will be offered by only one department. Department has instructors and instructors can work for one or more departments. Student can enrol in upto 5 subjects in a School. Instructors can teach upto 3 subjects. The same subject can be taught by different instructors. Students can be enrolled in more than one school.
- 12. 12 School has one or more Departments. School Department has1 1..* Department offers one or more Subjects. A particular subject will be offered by only one department. Department Subject offers1 1..*
- 13. 13 Department has Instructors and instructors can work for one or more departments. assigned to1..* Instructor Department 1..* Student can enrol in upto 5 Subjects. Student Subject takes* 0..5
- 14. 14 Instructors can teach up to 3 subjects. The same subject can be taught by different instructors. Instructor Subjects teaches 1..* 1..3
- 15. 15 Students can be enrolled in more than one school. Student School member * 1..*
- 16. 16 School Department Student Subject Instructor 1…* * member * 1..5 attends 1..3 1..* teaches 1..* 1 1 1..* has 1..* 1..* assignedTo offeres
- 17. 17 Object Diagram shows the relationship between objects. Unlike classes objects have a state.
- 18. 18 c1: Company d2: Departmentd1: Department name=“Sales” name=”CSSE” p1: Persont name=“Rao” p2: Person name=“Raj” manager employee c1: Company name=“UniMelb”
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