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Java doesn t make it easy for the programmer to take one kind of data and directly reinterpret it as another type of data. This can be frustrating if you ve done any programming in C and are used to looking at data in terms of bytes. But maintaining strongly typed data is integral to Java s internal security, so if you want to program in Java, you might as well get used to it. You can easily convert all of Java s simple data types into byte arrays and back again using the classes java.io.ByteArrayInputStream, java.io.ByteArrayOutputStream, java. io.DataInputStream, and java.io.DataOutputStream. The pair of methods shown in Listing 5-2 demonstrates how you can use these classes to convert between byte arrays and ints. Listing 5-2. Converting Between Arrays and Ints /** * Uses an input stream to convert an array of bytes to an int. */ public static int parseInt(byte[] data) throws IOException { DataInputStream stream = new DataInputStream(new ByteArrayInputStream(data)); int retVal = stream.readInt(); stream.close(); return(retVal); }

2. You must introduce every NXT you re going to use to your PC by using the Bluetooth Devices dialog (a feature present in Windows XP) once you have a Bluetooth dongle installed. To make them meet each other, open the Bluetooth Devices panel from the Control Panel or by double-clicking the icon you should have among the tray icons in the Windows application bar at the bottom of the screen, near the clock. In Figure A-4, you can see how my Bluetooth Devices dialog looks. You might have some items in yours, or none.

Also added to the solution is a set of recipes and templates that can be used for creating the components of the ACME POS Service solution. You can find these recipes and templates in the Guidance Package Manager, available from the Tools menu, as shown in Figure 3-5.

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Figure 3-5. Guidance Package Manager item on the Tools menu Choose Tools Guidance Package Manager to see the dialog box shown in Figure 3-6. The recipes provide functionality for performing specific tasks such as creating a database connection string. The templates define the different projects that make up the solution.

/** * Uses an output stream to convert an int to four bytes. */ public static byte[] intToFourBytes(int i) throws IOException { ByteArrayOutputStream baos = new ByteArrayOutputStream(4); DataOutputStream dos = new DataOutputStream(baos); dos.writeInt(i); baos.close (); dos.close(); byte[] retArray = baos.toByteArray(); return(retArray); } This same technique works for all of Java s simple data types. For Strings, you can use the methods readUTF() and writeUTF(). One design note in Listing 5-2 is that in most applications you wouldn t want to make multiple calls to utility functions like these because each call creates two stream objects that clutter memory and will later need to be garbage collected. Usually, if you plan to save a record that comprises multiple chunks of data, you d create the appropriate OutputStream as you did previously and then write the entire record to it before closing it. My example game uses the previous methods because, as you ll see next, each record contains only one int that needs to be saved using a stream.

Figure A-4. The Bluetooth Devices dialog in Windows XP 3. Click the Add button in the lower left of the panel and follow the instructions to make your NXT meet the PC and exchange greetings (see Figures A-5 and A-6). In those screens, click Next to proceed.

Figure 3-6. Guidance Package Manager dialog box We ll work with the ACME POS application in the next chapters. For now, close the Guidance Package Manager dialog box and ACME POS Service solution.

Figure A-6. The Wizard found a new NXT device (named NXT). 4. You re then asked for a passkey. Just type in 1234 the default for any NXT brick (see Figure A-7) and click Next. Finally, click Finish in the last screen. At this point, your NXT (with the name you gave it) should be listed in the Bluetooth Devices (Devices tab).

Using InputStream and OutputStream to encode and decode your data for storage purposes would be sufficient if your target device had an infinite amount of memory, which is far from the case for many small devices And the DataOutputStream uses a full byte to record a single Boolean when of course you could squeeze eight Booleans into the same space, and as mentioned previously, DataOutputStream uses 4 bytes to store an int when you often know in advance that the value will be small enough to fit into 1 or 2 bytes Of course, you have a little bit of design strategy to consider when deciding whether to store your data in the standard way or compact it Compacting your data not only complicates your program, but it makes your data less portable.

Summary

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