On behalf of ASE crew, I welcome you onboard. We will cover this journey in roughly 50 minutes.
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1 On behalf of ASE crew, I welcome you onboard. We will cover this journey in roughly 50 minutes. We will fly over the basics of Object Oriented Analysis and Design. We may encounter some turbulence at times. Since you don t have seatbelts, please stay awake. Thank you for choosing to attend this tutorial and wish you a pleasant flight (lecture)! --Venkatesh Vinayakarao
2 Object Oriented Analysis and Design (OOAD) An Introduction Venkatesh Vinayakarao Assistant Professor Indian Institute of Information Technology, Sri City, Chittoor The art of simplicity is a puzzle of complexity. Douglas Horton. Love Tarun Venkatesh Vinayakarao (Vv)
3 House Rule Raise your hand if you know the answer. Do not shout out unless offered a chance by your instructor.
4 Software Engineering (SE) is very challenging! Why?
5 Challenges in SE Over-specification and under-specification Relying on star performers Weak personnel and problem employees Requirements creep Code not even understood by the author done by trial and error Designing, Coding,. and >100 more!
6 Challenges in RE Challenges in the Problem Space (Analysis) How to deal with these challenges? Challenges in the Solution Space (Design) Requirements Implementation
7 How to tame complexity? Can we learn from the world around us?
8 How to get All India Rank 1 in JEE? *Am not AIR 1 in JEE. Just for fun.
9 How did we humans build this?
10 We could build these too!
11 How to tame complexity? Can we learn from the world around us?
12 Taming Complexity 1. Hierarchy 2. Abstraction Key Principles 3. Keeping Related Things Together 4. Polymorphism
13 Do you recognize this? *Table of Contents of C Programming Book
14 Objects are Everywhere! We are inherently Object Oriented! An Example Object: Identity (Venkatesh) Data (Height = 5 6, Weight = 80 KG*, ) Behavior (Lecture, Put Students to Sleep, ) *May be slightly more. Objects have Identity, Data and Behavior associated with them.
15 Abstraction Student Ravi Surya Bhaskar Student is a class. The objects namely Ravi, Surya and Bhaskar belong to the Student class.
16 Abstraction Classroom Classroom 101 Student Student1 Student2 Faculty Faculty1 Electrical Fitting Light Power Saver Light PSL 1 PSL 2 and so on. A class called Student. Objects are instances of a class.
17 Class Vs. Object Class has: Data (Dogs are four legged [quadruped]). Behavior (Dogs bark). Object has: Identity (Jimmy). Data (four legged). Behavior (barks).
18 Quiz Which of the following is not a class? Employee Train Vehicle India
19 Quiz Which of the following is not a class? Employee Train Vehicle India
20 Quiz Which of the following is not an Object? LG Q6 Mobile Phone Subu Kandaswamy Pinakini Express Employee with ID 231
21 Quiz Which of the following is not an Object? LG Q6 Mobile Phone Subu Kandaswamy Pinakini Express Employee with ID 231
22 Three Volunteers Please Venkatesh 22
23 Describe this!
24 Why UML? Part of the problem in industry today is related to 1. Specification 2. Visualization 3. Construction
25 What is UML? Unified Modeling language (UML) is a standardized modeling language enabling developers to specify, visualize, construct and document artifacts of a software system. 25
26 History UML combines best of three principal methods: The Booch method, devised by Grady Booch, Object-oriented Modeling Technique (OMT), devised by Jim Rumbaugh, Object-oriented Software Engineering (also known as Objectory), devised by Ivar Jacobson. 26
27 History 1994 Jim Rumbaugh joins Grady Booch at Rational Software to merge their methods Booch and Rumbaugh published version 8 of the Unified method. Rational Software buys Objectory and Ivar Jacobson joins the company Booch, Rumbaugh and Jacobson release (through Rational) a proposal of version 1 of UML UML version 1.1 was adopted by The Object Management Group (OMG), a non-profit organization.
28 Modeling Software Systems How is the software structured? (Structural Description) Class Diagram Object Diagram Component Diagram Deployment Diagram Composite Structure Diagram Package Diagram What does the software do? (Behavioral Description) Use Case Diagram Activity Diagram Interaction Overview How do multiple components interact? (Interaction Description) Sequence Diagram Communication Diagram Timing Diagram Interaction Overview Diagram 28
29 Class Notation Dog Calculator breed : String scientific : boolean jump eat bark add multiply divide subtract 29
30 Class Code Transformation Dog public class Dog { private String breed; breed : String jump eat bark } public int bark() {... }
31 Classes have Relationships Association 31
32 Relationships - Aggregation Aggregation represents a part-whole or part-of relationship. Computer Monitor Keyboard Examples are taken from OMG tutorial on UML by Cris kobryn 32
33 Quiz Can you identify an aggregation relationship for this classroom?
34 Quiz Can you identify an aggregation relationship for this classroom? classroom chair board
35 Relationships - Composition "owns a" or association relationship Part dies with the whole. Note that, window may exist without a slider! Window scrollbar [2]: Slider title: Header body: Panel Window scrollbar 2 title 1 body 1 Slider 1 1 Header 1 Panel 35
36 Quiz Can you identify any composition relationship?
37 Quiz Can you identify a composition relationship? Person Leg Hand
38 Relationships - Generalization Supertype subtype relationship. Also known as is a relationship. In practice, this means that any instance of the subtype is also an instance of the supertype. Example 2: There are three account types: Checking, Savings and Credit. Example 1: Button is a rectangular clickable object. 38
39 Class Diagram University Scenario Source: uiowa.edu. 39
40 Object Diagram At a specific time, shows the object instances and relationships. Tommy: Dog breed : String Dog tommy = new Dog(); jump eat bark 40
41 Limitations Complex to hand-write UML diagrams. We need tools. Even with UML, auto-generation of code requires the model to be at very low level. This is considered impractical. There are too many diagrams and yet descriptions are not well captured. 41
42 Resources Tools: ArgoUML ( Books:
43 THANK YOU The art of simplicity is a puzzle of complexity. Douglas Horton. Love Tarun Venkatesh Vinayakarao (Vv)
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