Motivating Problem Whenever the display feature is called, retrieve the current values of temperature, humidity, and/or pressure via the weather data reference. 3 of 35 Implementing the First Design (1) class WEATHER_DATA create make feature — Data temperature: REAL humidity: REAL pressure: REAL feature — Queries correct_limits(t,p,h: REAL): BOOLEAN ensure Result implies -36
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Recursion EECS2030: Advanced Object Oriented Programming Fall 2017 CHEN-WEI WANG Recursion: Principle ● is useful in expressing solutions to problems that can be defined: ○ Base Cases: Small problem instances immediately solvable. ○ Recursive Cases: Large problem instances not immediately solvable. Solve by reusing solution(s) to strictly smaller problem instances. ● Similar idea learnt in
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Inheritance Readings: OOSCS2 Chapters 14 – 16 EECS3311 M: Software Design Winter 2019 CHEN-WEI WANG Aspects of Inheritance Code Reuse Substitutability X Polymorphism and Dynamic Binding X Sub-contracting [ compile-time type checks ] [ runtime behaviour checks ] 2 of 63 Why Inheritance: A Motivating Example Problem: A student management system stores data about students.
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Wrap-Up EECS3311: Software Design Fall 2017 CHEN-WEI WANG What You Learned Design Principles: X Abstraction [ contracts, architecture, math models ] Think above the code level X Information Hiding X Single Choice Principle X Open-Closed Principle X Uniform Access Principle Design Patterns: X Singleton X Iterator X State X Composite X Visitor X Observer X
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Drawing a Design Diagram using the Business Object Notation (BON) EECS3311 A & E: Software Design Fall 2020 CHEN-WEI WANG Why a Design Diagram? ● SOURCE CODE is not an appropriate form for communication. ● Use a DESIGN DIAGRAM showing selective sets of important: ○ clusters (i.e., packages) ○ classes ○ architectural relations [ generic
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Design-by-Contract (DbC) Readings: OOSC2 Chapter 11 EECS3311 A: Software Design Fall 2019 CHEN-WEI WANG Motivation: Catching Defects – When? ● To minimize development costs , minimize software defects. ● Software Development Cycle: Requirements → Design → Implementation → Release Q. Design or Implementation Phase? Catch defects as early as possible . ∵ The cost of
Elementary Programming EECS2030 B: Advanced Object Oriented Programming Fall 2019 CHEN-WEI WANG Entry Point of Execution: the “main” Method For now, all your programming exercises will be defined within the body of the main method. The main method is treated by Java as the starting point of executing your program. Sequential Execution: The execution starts
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Abstract Classes and Interfaces EECS2030: Advanced Object Oriented Programming Fall 2017 CHEN-WEI WANG Abstract Class (1) Problem: A polygon may be either a triangle or a rectangle. Given a polygon, we may either ○ Grow its shape by incrementing the size of each of its sides; ○ Compute and return its perimeter; or ○ Compute
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EELS 1021 object-Oriented From Programming Sensors to Actuators Winter 219 : J a nuary 7 Mond a y Lecture I Low – Level PL us . High- Level PL e#- gum HI *⇒. 1€ oEEYln4sI 7 ARE whip Late → assignment given completed programming → I. session lab quit ? . graded Watt until you
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Wrap-Up EECS2030 B: Advanced Object Oriented Programming Fall 2018 CHEN-WEI WANG What You Learned (2) ● Object-Oriented Programming in Java ○ classes, attributes, encapsulation, objects, reference data types 3 of 8 ○ methods: constructors, accessors, mutators, helper ○ dot notation, context objects ○ aliasing ○ inheritance: ● codereuse ● expectations ● staticvs.dynamictypes ● rulesofsubstitutions ●
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