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Java is a package-centric language; the developers assumed that for good organization and name scoping, you would put all your classes into packages. They were right, and you should. Imagine this nightmare: three different programmers, in the same company but working on different parts of a project, write a class named Utilities. If those three Utilities classes have not been declared in any explicit package, and are in the classpath, you won t have any way to tell the compiler or JVM which of the three you re trying to reference. Sun recommends that developers use reverse domain names, appended with division and/or project names. For example, if your domain name is geeksanonymous.com, and you re working on the client code for the TwelvePointOSteps program, you would name your package something like com.geeksanonymous.steps.client. That would essentially change the name of your class to com.geeksanonymous.steps.client.Utilities. You might still have name collisions within your company, if you don t come up with your own naming schemes, but you re guaranteed not to collide with classes developed outside your company (assuming they follow Sun s naming convention, and if they don t, well, Really Bad Things could happen).

What does it mean to access a class When we say code from one class (class A) has access to another class (class B), it means class A can do one of three things:

It can be argued that hackers do what they do because of a lack of judgment. They are young; they don t sense the wrongness of what they re doing. They succumb to peer pressure, or they are psychologically flawed because of family problems and aren t capable of sensing the difference between right and wrong.

Create an instance of class B Extend class B (in other words, become a subclass of class B) Access certain methods and variables within class B, depending on the access

Where your view goes is one of the most important parts of your view s definition. Many classes use an initWithFrame: init method, inherited from UIView, which defines location as part of the object s setup. The frame is a rectangle that you ve defined with a method like CGRectMake. Another common way to create a rectangular frame is to set it to take up your full screen:

control of those methods and variables. In effect, access means visibility. If class A can t see class B, the access level of the methods and variables within class B won t matter; class A won t have any way to access those methods and variables.

10 Knowledge claimed and knowledge held are often quite different. The author reviewed one legitimately published book that claimed to be an authority on the telecommunications and computer technology behind hacking. It was rife with errors. Hence, a careful assessment of a hacker s actual knowledge base is in order. 11

Declarations and Modifiers (Exam Objective 1.2)

[[UIScreen mainScreen] bounds];

Default Access A class with default access has no modifier preceding it in the declaration. In other words, it s the access control you get when you don t type a modifier in the class declaration. Think of default access as package-level access, because a class with default access can be seen only by classes within the same package. For example, if class A and class B are in different packages, and class A has default access, class B won t be able to create an instance of class A, or even declare a variable or return type of class A. In fact, class B has to pretend that class A doesn t even exist, or the compiler will complain. Look at the following source file:

package cert; class Beverage { }

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