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As shown in the earlier section on debugging, the BlackBerry JVM performs permission checking for MIDP APIs at runtime When a security error occurs, a javalangSecurityException is thrown by the offending API and the application has a chance to handle it Developers can detect the security error and either disable the

The initWithString: method in Listing 4-16 takes an NSString as a parameter It then calls its superclass init method If init doesn t return a null value, it initializes its myName instance variable to inputString Do not worry about the keyword retain for now; you learn about that in 5 All it does is ensure that the pointer to inputString remains valid Remember, Objective-C passes around objects by reference, not value, so myName is not a unique instance of an NSString, but rather a pointer to the NSString inputString As you will see in 5, retain ensures that reference remains valid The initializer ends by returning itself as an id

offending functionality or show more information to the user For example, a Solitaire application could disable the high score upload feature if the user blocks network access (see Listing 5-1)

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The way you approach building privacy depends on who you think might want your information Most people want to keep information from one or more of the following four groups: Criminals: There are people in the world who will use personal information to harm you, be it physically, financially, or socially Identity thieves use private information to impersonate you, doing financial harm in the process Stalkers can use private information to harm you physically Society: Some of the things we think and/or do would be frowned on or misunderstood by our societies We keep these thoughts and actions private whenever possible Tabloids thrive on exposing private aspects of the lives of celebrities

Be certain you read the section on designated initializers in 7 Notice that if you used either Foo s or Bar s init method (not initWithString), then the string would be a null value and nothing would print to the debugger console A designated initializer avoids this problem

Listing 5-1

Q: A:

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You talk about a superclass in the previous Try This What is a superclass I haven t discussed inheritance yet, but a superclass is a parent of a subclass In objectoriented programming languages classes can inherit the methods and instance variables of a parent class For instance, a Car class might inherit from a Vehicle class A Vehicle class might have a move method The Car class, as a child of Vehicle, inherits the move method Parent classes can in turn inherit from a parent class, just as your parents inherit from your grandparents Every class you write will ultimately inherit from NSObject as its base parent class NSObject defines an init method, and so every child class of NSObject is guaranteed to have an init method You will learn more on inheritance in 6

try { //Opening a ContactList will cause a javalangSecurityException if the //user denies the Access personal information prompt ContactList contactList = ContactList)PIMgetInstance()openPIMList(PIMCONTACT_LIST, PIMWRITE_ONLY); } catch (PIMException e) { //Handle PIMException } catch (SecurityException secE) { //Show dialog to the user or disable functionality }

Methods can have more than one argument Multiple argument methods are where Objective-C really shines Although at first confusing, Objective-C s multiple argument syntax makes it easier to read and maintain than other languages such as Java and C++

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