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If a factory method is provided instead, you have more flexibility. A factory method is usually a static method that takes the same arguments as the constructor and returns an instance of the same class in which the constructor is defined. The first advantage of factory methods is that you don t need to return the exact class. You can instead return a subclass, which lets you use polymorphism and possibly clean up the code. Second, you can cache instances. Although in the case of a constructor a new instance is created every time, a factory method can cache previously instantiated objects and reuse them to save memory. Third, you can synchronize better when invoking a factory method, unlike with a plain constructor where this is more limited. That s because a factory method can be synchronized as a whole, including potential code before the object creation, the code that creates the instances, as well as the rest of the code that runs after the object is created. This isn t possible in a constructor at all. We recently found yet another benefit of factory methods as we were rewriting the NetBeans APIs to use generics: factory methods let you think up the parameterized type for the returned object, and constructors don t. For example, we ve had the following class in the NetBeans APIs for ages: public final class Template extends Object { private final Class type; public Template(Class type) { this.type = type; } public Class getType() { return type; }

In this case, you want them ordered by date with the newest entries coming first, so you ll add an ordering option inside the inner Meta class: ordering = ['-pub_date'] Now Django will use ORDER BY pub_date DESC when retrieving lists of entries Let s also go ahead and activate the default admin interface, adding a __unicode__() method so you can get a simple string representation of an entry: class Admin: pass def __unicode__(self): return selftitle It s also a good idea to add help_text to most of the fields Use your judgment to decide which fields need it, but feel free to compare with and borrow from the full version of the Entry model included in this book Finally, let s add one more method: get_absolute_url() Remember from 2 that it is standard convention in Django for a model to specify its own URL.

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Figure 9-7. Shielded cable connected to female RCA line plug Once your shield is fitted to an Arduino and plugged into an amplifier you can go to the following section Speech Synthesizer Software to test it out.

public Template() { this(Object.class); } } When we migrated the NetBeans sources to JDK 1.5, it was natural to parameterize the Template class with a type parameter identifying the internal class object. This worked fine . . . public final class Template<T> extends Object { private final Class<T> type; public Template(Class<T> type) { this.type = type; } public Class<T> getType() { return type; } // now what! public Template() { this(Object.class); } } . . . up until the last constructor. It s supposed to create an instance of Template<Object>, but this cannot be expressed in Java 1.5. The language isn t flexible enough to express this kind of situation. This might be seen as our design mistake. However, when we initially designed this class, we had more pressing things to solve than verifying that it would easily fit into the Java 1.5 generic type system that had not yet been designed. Later, it was too late. The only chance we had was to deprecate the constructor, use an unchecked cast, and tell people to use the other one, with a class parameter. On the other hand, if we had followed the advice of this book using a factory method instead of exposing the constructor our situation would have been much better. There would be a create() factory method, and it would be much easier to generify such a method, as the following code is syntactically correct:

Adding a small amplifier to the shield so you can drive a speaker directly is quite easy with the LM386 audio amplifier IC. LM386 chips are very common in small audio devices, such as compact portable radios, because they're very easy to use and produce reasonable quality sound at a good volume level. They certainly won't compete with the amp in your stereo system, but for simple voice-level output in a portable device they're perfect.

public final class Template<T> extends Object { private final Class<T> type; public Template(Class<T> type) { this.type = type; } public Class<T> getType() { return type; } @Deprecated @SuppressWarnings("unchecked") public Template() { this((Class<T>)Object.class); } public static Template<Object> create() { return new Template<Object>(Object.class); } } This example demonstrates that there is much more flexibility when typing methods. That s because methods including factory methods aren t constrained by the type of the enclosing class, while constructors are. This is another reason to prefer factory methods over constructors.

In this case, you ll return a URL that includes the entry s publication date and its slug:.

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