Object Oriented Headlines Today?s Discussion OOAD

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Object Oriented Headlines Today?s Discussion OOAD

Ave Maria University, US has reference to this Academic Journal, OOAD Object Oriented Analysis in addition to Design Methodology Today?s Discussion Background ? Why OO is hot OO Methodology ? Java Factory Approach Hands on application of CRC Methodology Informal Questions anytime Food in addition to Drink anytime Object Oriented Headlines ?Object-Oriented Technology Ventures Into the Real World? ?IBM unveils new object-oriented middleware? ?Expo so that serve up object-oriented products? ?Object-Oriented is Here so that Stay?

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Motivation For OOAD Traditional Methodologies are broken because? They haven?t solved problems of quality in addition to timeliness. They separates data from procedures making software reusability more difficult. They don?t work well in our non-linear world. Linear vs. Non-linear Linear Non-Linear Step 1 Step 2 Step 3 Page 1 Page 2 Page 3 Page 4 OOAD Vs. Traditional Approach Process is less rigorous Analysis Paralysis Process is more fluid Waterfall vs. Onion No definitive stopping point How many iterations? More Trial in addition to Error? ?I failed my way so that success.? Thomas Edison

OOAD Methodology Roots Unified Modeling Language(UML) Use Cases Class Diagrams Sun Microsystems Java factory CRC Methodology Class Responsibility Collaboration Defining the Process Determine the Requirements Identify the Classes in addition to Objects Describe the Object Collaborations in addition to the classes Sketch the User Interface Diagram of OOAD Class Diagram Determine Requirements Identify Classes & Objects Describe Collaboration Sketch Interface Summary CRC Cards ColloborationDiagrams Interface Sketch

Encodings in addition to reducibility Designing your little language Remind me why we?re using strings? Encoding mismatches Encoding integers Reducibility Reducibility Reducibility Reducibility Reducibility Reducibility Reducibility Reducibility Reducibility Reducibility Interreducibility Interreducibility Reducibility & ?typical? behavior Reducibility & approximation Proving hardness Proving hardness

Determining Requirements Summary Paragraph Define general approach so that solving problem Emphasize the what in addition to not the how Describe all major functions(operations/methods) Define boundaries Sample Problem Summary Identifying Classes in addition to Objects CRC Card Preparation Class(data attributes) Responsibility(Message response) Collaboration(Class interaction)

Class Definition Classes are the templates or blueprints in consideration of objects Classes define the attributes in addition to behavior(methods) in consideration of objects Objects contain the data in addition to the methods Objects are the nouns of the Object Oriented world So how do you define Classes?? 1) Read Problem Summary statement in consideration of nouns in addition to noun phrases which may be physical objects, concepts, categories of objects or attributes of other objects. Create a list of all of these items. 2) Review list in consideration of Class candidates. Transfer classes so that CRC card. Sample Problem Summary

Noun Phrases Renter Application Bugs Inventory User Message Transitioning Nouns so that Classes Not always easy Iterative Experience Steps? Logical Groupings in addition to Leveling Identify Implied Classes Eliminate noise(primitives, attributes, messages) ?Design Decisions have no obvious right in addition to wrong answers.? Noun Phrases Class Steps Renter Application Bugs Inventory User Message Logical Groupings/Leveling Implied Classes Noise elimination

So what are the Classes of the Bug Rental Application?? Renter Lender Inventory CRC Card – Front Class: Renter Responsibilities: Collaborations: (Front of Card) Defining Responsibilities Use Problem Statement so that identify verbs Logical group in addition to organize action items Match Method so that Class Adjust in consideration of any omissions

Method Verbs Identification Track Inventory Rent Bug Decrease Inventory Return Bug Increase Inventory Display Message Logical Grouping Leveling Match Method so that Class Bug Rental Methods Renter Rent Bug Return Bug Display Message Lender Rent Bug Return Bug Supply Message Describing Collaboration Develop Use-case scenarios Sequence of related events Walk Through Use-cases Identify message exchanges Identify missed Classes

Identify Use-Case Scenarios Customer Rents a Bug ) Customer enters request in consideration of bug ) Lender checks inventory in consideration of bug availability ) If inventory is greater than zero Inventory is decreased by one Bug is made available so that Customer Message is sent so that Customer from Lender ) If inventory is zero, error message is sent so that customer from Lender Now it?s your turn? Develop Use-Case in consideration of Bug Returns Customer returns bug Lender increases inventory Lender sends message so that Customer CRC Card – Front Class: Renter Responsibilities: Collaborations: (Front of Card) Rent Bug Return Bug Display Message Lender Lender N/A

Identifying Attributes Characteristics of Class Adjectives of the Object Oriented World Inventory Example Bug ID Bug Description Bug Version Your turn again? Develop some common attributes in consideration of the Renter Customer Name Customer Address Customer Status Customer Rentals Customer Balance CRC Card – Back Attributes:

Developing a Class Diagram Class Name Attributes Methods CRC Adjustments Create new CRC cards Trash invalid CRC cards Challenge yourself Not a cookbook Process is not magic;requires critical thinking skills Iterate! Next Step. Onion Peeling(aka Iterate) Evolve From What so that How From abstract so that detailed functionality Define Data Access Define Physical environment

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This Particular Journal got reviewed and rated by Identify Use-Case Scenarios Customer Rents a Bug ) Customer enters request in consideration of bug ) Lender checks inventory in consideration of bug availability ) If inventory is greater than zero Inventory is decreased by one Bug is made available so that Customer Message is sent so that Customer from Lender ) If inventory is zero, error message is sent so that customer from Lender Now it?s your turn? Develop Use-Case in consideration of Bug Returns Customer returns bug Lender increases inventory Lender sends message so that Customer CRC Card – Front Class: Renter Responsibilities: Collaborations: (Front of Card) Rent Bug Return Bug Display Message Lender Lender N/A and short form of this particular Institution is US and gave this Journal an Excellent Rating.