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When you implement an interface, you re agreeing to adhere to the contract defined in the interface. That means you re agreeing to provide legal implementations for every method defined in the interface, and that anyone who knows what the interface methods look like (not how they re implemented, but how they can be called and what they return) can rest assured that they can invoke those methods on an instance of your implementing class. For example, if you create a class that implements the Runnable interface (so that your code can be executed by a specific thread), you must provide the public void run() method. Otherwise, the poor thread could be told to go execute your Runnable object s code and surprise surprise the thread then discovers the object has no run() method! (At which point, the thread would blow up and the JVM would crash in a spectacular yet horrible explosion.) Thankfully, Java prevents this meltdown from occurring by running a compiler check on any class that claims to implement an interface. If the class says it s implementing an interface, it darn well

Although superframe continues to be widely utilized, an improvement came about in the 1980s in the form of extended superframe (ESF), shown in Figure 3-49. ESF groups 24 frames into an entity instead of 12 and, like superframe, reuses some of the frame bits for other purposes. Bits 4, 8, 12, 16, 20, and 24 are used for framing and form a constantly repeating pattern (001011 . . . ). Bits 2, 6, 10, 14, 18, and 22 are used as a 6-bit cyclic redundancy check (CRC) to check for bit errors on the facility. Finally, the remaining bits, all of the odd frame bits in the frame, are

better have an implementation for each method in the interface (with a few exceptions we ll look at in a moment). We looked earlier at several examples of implementation classes, including the Ball class that implements Bounceable, but the following class would also compile legally:

Now that we ve explored the view controllers that work on both the iPhone and iPad, we ll discuss the iPad-specific view Figure 79 Objects in Interface Builder can controllers connect to a variety of different files..

public class Ball implements Bounceable { // Keyword 'implements' public void bounce() { } public void setBounceFactor(int bf) { } }

OK, we know what you re thinking: This has got to be the worst implementation class in the history of implementation classes. It compiles, though. And runs. The interface contract guarantees that a class will have the method (in other words, others can call the method subject to access control), but it never guaranteed a good implementation or even any actual implementation code in the body of the method. The compiler will never say to you, Um, excuse me, but did you really mean to put nothing between those curly braces HELLO. This is a method after all, so shouldn t it do something Implementation classes must adhere to the same rules for method implementation as a class extending an abstract class. In order to be a legal implementation class, a nonabstract implementation class must do the following:

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Follow all the rules for legal overrides (see 5 for details). Declare no checked exceptions on implementation methods other than

The split view controller is an iPad-specific view controller that allows you to separate content into different panes. Although you can implement it a few ways, by far the most common is to have a UITableView on the left and a UIView on the right. Since the split view is made of two views that you have learned about in previous chapters, we ll focus on the example instead of the individual views. One of the major places you ll see this interface component in use is in the iPad s Mail application. The left pane of the split view controller displays all of your mail messages while the right displays the content of the selected message.

return type (but does not have to declare the exceptions declared in the interface method declaration). But wait, there s more! An implementation class can itself be abstract! For example, the following is legal for a class Ball implementing the Bounceable interface:

3

abstract class Ball implements Bounceable { }