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t turns out that storing bytes of data locally on a device that s equipped for the Mobile Internet Device Profile (MIDP) is easy. Therefore, this chapter starts with an extremely simple example: you ll take the maze game example from 2 and store the user s preferred size information. Then, each time the user restarts the game, the game will automatically create the maze with walls of the user s chosen width rather than starting at the default width. The hard part of data storage and retrieval is when you have more complicated data to store. MIDP allows you to store arrays of bytes only. But what if the data you want to store isn t in the form of bytes The simplest thing to do is to use the classes java.io.DataInputStream and java.io.DataOutputStream to convert other types of data to bytes. But since memory can be scarce on a small device, it s a good idea to understand how you convert integers to bytes, and vice versa, so you can compact your data to store it more efficiently. Therefore, in this chapter, you ll see a utility class that converts ints to bytes and back again, compacting the data appropriately if it falls within a certain size range. Then you ll see a complete game example (using the utility class) in which the user can save a game that s currently in play and start it again later from that point. This example illustrates how to store complex data in a real game situation.

group These guidelines have been created by Microsoft and the industry as a whole to provide the best architectural guidance in developing software, including the application blocks themselves One of the foremost considerations in designing a new application block is extensibility, and one of the ways to ensure extensibility is by providing a public API to expose the application block s internal functionality The easiest way to expose an application block is by using interfaces or base classes to define the different possible points that an application block can be extended It is never a good idea to force an application developer to know the internals of an application (although that might be a good learning experience, it is probably more imperative for the developer to get the application coded and into production).

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56 parts total (all included in NXT retail set, except for one Touch Sensor and one 20cm cable)

The MIDP Record Management System (RMS) is simple. Its package javax.microedition.rms has only one class: RecordStore. A RecordStore is a collection of records, which are in fact just byte arrays. A RecordStore is identified by the property MIDlet-Vendor and the property MIDlet-Name in the JAD file, as well as by the name given to the RecordStore by the MIDlet that created it. This means that within a MIDlet suite (a group of MIDlets in the same JAR file), the MIDlets share the RecordStores they ve created, but MIDlet suites don t share RecordStores with other MIDlet suites (unless they re explicitly given permission to do so; you ll learn more about that in the sidebar Using Secure Connections While Selling Your Game in 8). A RecordStore is identified by the MIDlet-Vendor and the MIDlet-Name properties in addition to the store s name, so you don t have to start your RecordStore s name with your own package name to keep it in a separate namespace from the RecordStores of other unrelated MIDlets. It s a good thing, too, because the name of the RecordStore can be only 32 (case-sensitive) characters long, so you don t want to waste too many of them.

By creating interfaces and base classes, and using the Factory pattern, the Dependency Injection pattern, the Plug-in pattern, or some combination of the three, you can allow developers to simply modify a particular extension point to meet their specific needs Allowing this kind of extensibility is one of the main design goals of Enterprise Library and is considered a best practice throughout the software development industry Another important consideration is to ensure the implementation of the application block uses resources efficiently It is always best to make software with the leanest profile possible Here are just a few resource-efficiency recommendations for developing any software application: Never try to create instances of a class unnecessarily if you don t need it, why use it Try to let the NET garbage collector do its job.

Rotate the NXT upside down and attach the black joiners to the blue axle pins. Rotate the NXT and add two black pins.

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