CS 4233: Object Oriented Analysis and Design

CS 4233: Object Oriented Analysis and Design 9-Jan-2003 Lecture 1

Outline • Previous Business • none • Course Introduction • Mini-design Example Lecture 1

Course Introduction • CS 4233: Object-oriented Analysis & Design • Prof. Heineman (heineman@cs), FL 137 • Office hours • Tuesday 10:00 – 11:00 AM • Thursday 5:00 – 6:00 PM • my.wpi.edu web site available Lecture 1

Course Structure • Core of five design assignments (50%) • Midterm exam, Friday January 31st (20%) • Final exam, Thursday February 27th (20%) • Class participation (10%) • as evidenced by questions/answers in class, visits to office hours, communication on my.wpi.edu Lecture 1

Course Goals • Understand, develop, and critique UML models • Utilize use cases to identify and describe requirements and specifications of a software system • Generate a detailed design document for a software system • Understand the use of design patterns within complex designs • Describe and illustrate the use of design patterns Lecture 1

Course Focus • Lay a foundation for OO design • too much OO programming is done without first focusing on the design • Educate in best practices of OO design • hands-on experience • Challenge you • Seven weeks of thinking design Lecture 1

Basic Terms (from TAOO) Object – an abstraction of a physical entity or conceptual thing Class – the abstract descriptorof a set of object instances How are classes defined? Through analysis. ClassData Operations Lecture 1

OO Requirements Analysis (RA) • Identify objects that are necessary for the context of a desired software application • Typically precedes OO Design (OOD) • OORA specifies externally visible characteristics of a system • OOD specifies internal structure of system Lecture 1

Design Example • Client makes the following request: I want to keep a linked list of the books in my collection. There are several categories of books, including Science Fiction, Fantasy, Fiction, NonFiction, Literature, and Reference. I frequently buy and sell books, and need monthly reports of my collection broken down by category. Lecture 1

Requirements Analysis <<identify nouns>> I want to keep a linked list of the books in my collection. There are several categories of books, including Science Fiction, Fantasy, Fiction, NonFiction, Literature, and Reference. I frequently buy and sell books, and need monthly reports of my collection broken down by category. Lecture 1

Booktitle : Stringauthor: StringisFantasy : BooleanisLiterature: BooleannextFantasy : BooknextLiterature : Book… Analysis Model V0 • Critique RoadMap • Summarize the design • Identify the design decisions • Explain correct decisions • Critique flawed decisions 1 nextFantasy Book nextLiterature 1 Lecture 1

CollectionfantasyBooks : BookliteratureBooks : BooknonFictionBooks : Book… Booktitle : Stringauthor: Stringnext: Book… Analysis Model V1 Collection Book 1 * Lecture 1

Collectioncategories : Category[*]… addCategory (Category c) Category getCategory(s) Categorytype : Stringbooks : Book… addBook (b) Booktitle : Stringauthor: Stringnext: Book… Analysis Model V2 Collection Category Book 1 * 1 * Lecture 1

Why doesn’t the JDK have… • Some Basic classes? • Person • User • Book • Why do its classes seem ‘too much’ • Currency (JDK 1.4 only) • Collection [not a class but an interface] • String [11 constructors (2 deprecated), 55 methods (1 deprecated)] Lecture 1

public String toLowerCase(Locale locale) { int len = count; int off = offset; char[] val = value; int firstUpper; /* Now check if there are any characters that need to be changed. */ scan: { for (firstUpper = 0 ; firstUpper < len ; firstUpper++) { char c = value[off+firstUpper]; if (c != Character.toLowerCase(c)) {break scan;} } return this; } char[] result = new char[count]; /* Just copy the first few lowerCase characters. */ System.arraycopy(val, off, result, 0, firstUpper); if (locale.getLanguage().equals("tr")) { // special loop for Turkey for (int i = firstUpper; i < len; ++i) { char ch = val[off+i]; if (ch == 'I') { result[i] = '\u0131'; // dotless small i continue; } if (ch == '\u0130') { // dotted I result[i] = 'i'; // dotted i continue; } result[i] = Character.toLowerCase(ch); } } else { // normal, fast loop for (int i = firstUpper; i < len; ++i) { result[i] = Character.toLowerCase(val[off+i]); } } return new String(0, result.length, result); } Lecture 1

Friday Assignments • Read TAOO: Chapter 1 • Complete Constructor Challenge Quiz • Do exercise 1-2 Lecture 1

References • JDK online documentation. • Currency • IMF special Basket, Lecture 1

CS 4233: Object Oriented Analysis and Design