В© Drinkwater, Charleston, Scholz (USyd.SIT) INFO3220: Object Oriented Design 2018 S1 9 / 51 We will go into these in more detail once we have a few design patterns in Relating run-time and compile-time structures S1How design patterns solve design problemsDesign patterns solve problems byfinding and using appropriate objects determining the objectsвЂ™ granularity (size)specifying object interfaces В© Drinkwater, Charleston, Scholz (USyd.SIT) INFO3220: Object Oriented Design 2018 S1 8 / 51 Tight coupling: too much dependence between classesД®xtending functionality by making subclasses S1Some common reasons to have to redesign a programCreating an object by specifying its class (not its interface)Dependence on specific operationsDependence on platformДependence on an objectвЂ™s representation in memory or В© Drinkwater, Charleston, Scholz (USyd.SIT) INFO3220: Object Oriented Design 2018 S1 7 / 51 В© Drinkwater, Charleston, Scholz (USyd.SIT) INFO3220: Object Oriented Design 2018 S1 6 / 51ДЄdapted from the GoF book: Design Patterns You will look at each of these throughout the semester in either the S1A Table of Design Patterns PurposeCreational Structural BehaviouralД¬lass Factory Method Class Adapter InterpreterTemplate MethodДЄbstract Factory Object Adapter Chain of Responsibility В© Drinkwater, Charleston, Scholz (USyd.SIT) INFO3220: Object Oriented Design 2018 S1 5 / 51 The four essentialД¬omponents of a pattern in our context are these:ДЎ The pattern name вЂ“ e.g., Factory Method Дў The problem that the pattern is designed to solve ДЈ The solution: the components of the design and how they related toД®ach other in order to solve the problem.Д¤ The consequences: both advantages and disadvantages of the pattern. S1What is a design pattern?A pattern is a description of a problem and its solution. В© Drinkwater, Charleston, Scholz (USyd.SIT) INFO3220: Object Oriented Design 2018 S1 4 / 51 WhatвЂ™s a design pattern and an introduction S1Starting with creational design patterns first В© Drinkwater, Charleston, Scholz (USyd.SIT) INFO3220: Object Oriented Design 2018 S1 3 / 51

S11 Lecture 5: Design PatternsDesign PatternsДў Lecture 6: The Factory Method and the Abstract Factory Design В© Drinkwater, Charleston, Scholz (USyd.SIT) INFO3220: Object Oriented Design 2018 S1 2 / 51 The subject of copyright protection under the Act. Any further copying or communication of this material by you may be The material in this communication may be subject to copyright under theДЄct.

This material has been reproduced and communicated to you by or onД«ehalf of the University of Sydney pursuant to Part VB of the Copyright Act S1Copyright WarningCOMMONWEALTH OF AUSTRALIACopyright Regulations 1969WARNING В© Drinkwater, Charleston, Scholz (USyd.SIT) INFO3220: Object Oriented Design 2018 S1 1 / 51 Bernhard of Information Technologies, University of Sydney

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