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In this chapter you explored how Objective-C implements inheritance A child class inherits its parent class instance variables and methods Moreover, it inherits every ancestor s instance variables and methods This allows efficient code reuse and makes your applications less prone to error because it has less duplicated code A child class can both extend a parent and override a parent s functionality When extending a parent, a child adds new functionality to a parent When overriding a parent s functionality, it can either replace a parent s functionality or add to it But remember, you can only replace a parent s methods and not its instance variables You will use inheritance extensively when developing iPhone applications All UIKit graphical controls ultimately inherit from the UIView class Moreover, when you create a view s view controller, you almost always create a UIViewController subclass In fact, when using the Foundation framework or the UIKit, unless working directly with NSObject, you are always using a child class Understanding inheritance is fundamental to understanding Objective-C

import javautil*; class Oofla { } class Yazell implements Whomper { } class Floordum { } interface Whomper { } class Grobnet extends Yazell, Floordum { List<Oofla> o; } interface Floordum { } interface Whomper { } class Grobnet extends Yazell implements Floordum, Oofla { } class Oofla { } interface Yazell implements Whomper { }

Understanding Protocols Modeling Protocols Using UML Adopting Protocols Using Protocols Understanding Categories Using Categories

C import javautil*;

f you know anything about Java s interfaces, then you already have a reasonable understanding of Objective-C s protocols A protocol is a contract that specifies methods that an adopting class must implement if it is to properly adopt the protocol Protocols are an important Objective-C programming concept that you must understand to successfully write iPhone applications In this chapter you learn about protocols

D import javautil*;

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Protocols declare the behavior an object can exhibit or what other objects can do to an object For instance, suppose you had Bumblebee, Jet, and Bird classes All three, although unrelated, implement the flying behavior, and so you could say they are each a Flyer Also notice that you could shoot all three with a gun, and so you could also say they are Shootable In both situations you are using a concept to group unrelated objects based upon behaviors Protocols model these types of situations A class that wishes to adopt a protocol must implement the methods declared by the protocol By requiring the adopting class to implement methods, a protocol forms a contract That contract ensures the runtime that a class that adopts a protocol implements the methods declared by the protocol

interface Floordum { } interface Whomper { } class Grobnet extends Yazell implements Floordum { Set<Oofla> o; } class Oofla { } class Yazell { Whomper w; }

If you come from a Java background, you are accustomed to classes implementing interfaces In Objective-C terminology classes do not implement protocols, but rather they adopt them But in reality adopt and implement have the same meaning

Answer (for Objective 55): is correct The phrase translations are can have usually means a class has an instance A variable, or set of variables; support the contract implied should be taken to mean implementing an interface; type of typically means subclass; can act as is often another way to say implement an interface Notice in answer A that Grobnet indirectly implements Whompers by extending Yazells C, and D are incorrect B is incorrect because a class can t extend more than one class C is B, incorrect because implementing an interface is not the same as having an instance variable of the interface s type In addition, interfaces can t implement interfaces D is incorrect because Yazell has-a Whomper and the design calls for Yazell to implement Whompers

57 Given:

The UML class diagram has a convenient notation for modeling protocols (Figure 7-1) In Figure 7-1 the Bird, Jet, and Bumblebee all adopt the Flyer protocol and so you draw a dashed arrow with a white point from the adopter to the adopted The Flyer, being a protocol, is added the protocol stereotype Don t worry about a stereotype s definition; all that it means here is that you are using a symbol normally used for a class to represent a protocol

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