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There are three or four implementations of that class and millions of clients that call its methods The API owner more than likely gave up on compatibility for subclasses and even adds new abstract methods to that class For 999 percent of clients this is acceptable, and therefore this is probably an acceptable approach The only downside is that NetBeans used to fall into the 001 percent of users that implement the class! We experienced problems with every new version of the JDK that added new methods to it But, again, this is completely about attitude If being 9999 percent compatible is good enough for you, then using abstract classes such as this might be acceptable under the circumstances The other advantage of Java abstract classes versus Java interfaces is that Java abstract classes can include static methods.

It s also possible to use a slightly different syntax for decorators in Python. They can be placed directly above the function or method s definition and prefixed with an at (@) symbol. In this case, that would have meant placing @models.permalink directly above: def get_absolute_url(self): This syntax was introduced in Python 2.4, so if you re using 2.4 or a later version, it will work. I generally avoid it in my Django applications, though, because Django also works with Python 2.3, where the only available syntax is to call the decorator below the function or method definition. In general, it s a good idea to write your code so that it s compatible with the largest possible number of Python versions.

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Figure 10-5. LCD module connected to shield using ribbon cable The other end of the ribbon cable needs to be connected to the prototyping shield. Working from left to right on the LCD module, the ground and 5V lines obviously need to connect to GND and 5V on the shield. RS and Enable then connect to digital I/O lines 9 and 8, respectively. Data bits 4 through 7 connect to I/O lines 7 through 4, respectively. See Table 10-1. Table 10-1. Connections between Arduino and LCD module

Even if you want to specify clear interfaces with all methods abstract, it might make sense to work with abstract classes if there s a need for static.

Display ground connection Display +5V connection Contrast adjustment voltage Data input (HIGH) / Control input (LOW)

factory methods that the user can easily discover while reading the Javadoc for the interface class. You can also have an interface and a separate factory class that creates it, but this is ultimately a matter of preference. A third useful feature of Java classes over Java interfaces is the possibility of restricting access rights. Every method in a public Java interface is public and everybody can implement or call it. This might be the right time for the use of an abstract class. For example, you can make all methods protected abstract and in this way declare an interface that others can implement, but that nobody outside your code can call. This might be an advantage in certain situations. However, bear in mind that this prevents delegation you cannot create a decorator that adds additional capabilities, such as logging, on top of an existing instance. Sometimes this might be quite a painful restriction. Yet another possibility with abstract classes is to restrict those who can implement them. You can make all your methods public abstract, while either providing a package private constructor or restricting creation to certain subclasses during runtime: public abstract class InterfaceThatJustJoeCanImplement { protected InterfaceThatJustJoeCanImplement() { if (!"impl.joe.JoesImpl".equals(getClass().getName())) { throw new IllegalStateException( "Sorry, you are not allowed to implement this class" ); } } public abstract void everyoneCallThisJoeWillHandleTheRequest(); } Though the runtime check isn t pretty, it does the job of restricting the set of possible implementors. This wouldn t have been possible with interfaces.

And now you ve completely decoupled the entry URLs from the project and from any assumptions about particular site URL layouts. These URLs can be plugged in to any project at any point in its URL hierarchy, and between include() and the permalink() decorator, the generated URLs will always be correct.

Read (HIGH) / Write (LOW) Enable byte/nibble transfer Data bit 0 Data bit 1 Data bit 2 Data bit 3 Data bit 4 Data bit 5 Data bit 6 Data bit 7 Backlight +5V connection Backlight ground connection

One of the most frequent questions you need to solve when changing an API is how to enhance your existing methods with additional parameters. This is a common scenario, especially if the requirements for the API are in flux. For example, say you have a method that was called by the framework to compute the content of a UI list. Later you realize that you not only need that content, but you also need some additional text to describe or classify the computed data. If that happens, you can add a new method that calls the previous one, as follows: public abstract class Compute { /** * @return list of strings to work with * @since 1.0 */ public abstract List<String> getData(); /** Computes the strings to work with together with their * associated descriptions. Shall be overriden in subclasses.

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