The document discusses inheritance, association, and dependency in object-oriented programming and Unified Modeling Language (UML). It defines inheritance as a class inheriting properties and operations from a parent class. Association represents relationships between classes, such as one-to-one, one-to-many, and many-to-many. Dependency shows the client-supplier relationship between classes to visualize abstraction and separation of concerns. The document also provides UML notations for representing these concepts using lines, arrows and other symbols.

1. UML
Inheritance
Association
Week Dependency
- By – Md. Nadimozzaman Pappo
- ID - 132014031
6/6/2016Depertment of Computer Science & Engineering
1

2. What is Inheritance?
 Getting characteristics from parent
 Real life examples
 Child get properties of Parents
 Generalize an idea
 Usage in problem & solution design makes perfect logical sense
6/6/2016Depertment of Computer Science & Engineering
2

3. Inheritance in OOP
 One of the core concepts of OOP
 Sub Class, Super Class relation
 Sub Class inherits from Supper Class
 Inherits properties & operations
 Simplify the codes
6/6/2016Depertment of Computer Science & Engineering
3

4. UML Notation - Inheritance
 Solid line with a closed arrowhead
 From sub Class to super Class(Child
to Parent)
 Arrowhead is closed but not filled
 Can be tree structured
6/6/2016Depertment of Computer Science & Engineering
4

5. Why its important?
 Generalize the Design
 Makes easier map to OOP
 Logical parts creation of whole project
 Visualize relations among objects
 Create abstraction
6/6/2016Depertment of Computer Science & Engineering
5

6. What is Association?
 The relation among things
 Denotes how its related
 Family of links
6/6/2016Depertment of Computer Science & Engineering
6

7. Association in OOP
 Objects may be linked or combined
 May be logically or Physically
 Binary, N-Ary
 Order of the ends
6/6/2016Depertment of Computer Science & Engineering
7

8. UML Notation - Association
 Normally denoted by line
 May have any number of links
 Four different types of association:
bi-directional, uni-directional,
aggregation and reflexive
 Also denote relations – One to one,
one to many, many to many etc.
6/6/2016Depertment of Computer Science & Engineering
8

9. Why its important?
 Get grouped or linked objects
 Relations among Classes
 Get DB relations
 How Classes are related
6/6/2016Depertment of Computer Science & Engineering
9

10. What is Dependency?
 A relationship among things
 Provides client-supplier visualization
 Create abstraction of solution & problem
6/6/2016Depertment of Computer Science & Engineering
10

11. Dependency in OOP
 Separates dependent & independent Classes
 Clarify the deployment of Classes on situations
 Creates abstractions in terms of usage
6/6/2016Depertment of Computer Science & Engineering
11

12. UML Notation – Week Dependency
 Denoted by a dashed arrow
 From client to supplier
 Arrow is not filled
 Also denote usage, create etc.
operation
6/6/2016Depertment of Computer Science & Engineering
12

13. Why its important?
 Simplify the relationship among models or classes
 Shows usages dependency
 Shows usages abstraction of whole project
6/6/2016Depertment of Computer Science & Engineering
13