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A reuse identifier lets the table view reuse old cells without having to make more. It s a clever technique used by efficiency-minded programmers that makes table views fast and easy to use. And, yes, it is digital recycling! Once we have a viable cell, we need to change its text label. We grab the text that will be used from our categories array, since that array holds the text we want to display. We call objectAtIndex: to access our array, passing it [indexPath row] for the index. This gets the object that we need for the row in the table (that the table view is trying to display). We then set the cell s Text Label text to the text we got from the categories array, and then we return the cell to be displayed. Yes, I know, it s a whirlwind of variables, exchanges, counts, and releases. You ll catch on, though. Remember: this is just a quick tour a bit of dessert after a tasty chapter!

The Dalvik VM is an example of the need for efficiency, the desire for a rich programming environment, and even some intellectual property constraints, colliding, with innovation as the result. Android s Java environment provides a rich application platform and is accessible because of the popularity of Java itself. Also, application performance, particularly in a low-memory setting such as you find in a mobile phone, is paramount for the mobile market. But this isn t the only issue at hand. Android isn t a Java ME platform. Without commenting on whether this is ultimately good or bad for Android, there are other forces at play here. There s the matter of Java VM licensing from Oracle. From a high level, Android s code environment is Java. Applications are written in Java, which is compiled to Java byte codes and subsequently translated to a similar but different representation called dex files. These files are logically equivalent to Java byte codes, but they permit Android to run its applications in its own VM that s both (arguably) free from Oracle s licensing clutches and an open platform upon which Google, and potentially the open source community, can improve as necessary. Android is facing litigation challenges from Oracle about the use of Java. From the mobile application developer s perspective, Android is a Java environment, but the runtime isn t strictly a Java VM. This accounts for the incompatibilities between Android and proper Java environments and libraries. If you have a code library that you want to reuse, your best bet is to assume that your code is nearly source compatible, attempt to compile it into an Android project, then determine how close you are to having usable code.

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XQuery sequences can contain subsequences, such as the (2, 3) sequence, which is a component of the larger sequence in the example. Sequences can contain numeric values, character strings, and values of other data types. A sequence like the one shown is flattened out so that subsequences become part of the larger sequence, and empty sequences are removed. After this initial processing, the preceding sequence looks like the following to the XQuery processor:

The TermScorer is one of the easiest score implementations to understand. If you followed this even at just a cursory level, you have to have noticed how prevalent the Similarity class is in this calculation. Because of this, the authors recommend that, before you try to implement your own scorer, you determine whether what you want to accomplish can be done through reimplementing the Similarity class. This may save you not only a lot of work but also possibly a lot of long and sleepless nights.

Summary

someField.underscored LIKE '\_%'

return (self);

ControllerBuilder.Current.SetControllerFactory(new MyCustomControllerFactory());

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Now that you have a collection of Book objects, you can use a foreach loop to process them; in this case, outputting them to the console:

Figure 4.16 The Thread Viewer shows the activity of an application s threads. This example shows the ThreadedServer accepting concurrent client messages.

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