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Caution Code in your Catch statements can throw errors as well, and these are not automatically caught. So, if you are running code in your Catch statement that could throw an error, remember to surround it in a Try Catch statement as well.

You should place Try Catch statements around code that has a decent chance of failing, but not around code that will normally be safe. For instance, you would not want to write code that looks like Listing 2-2. Listing 2-2. Code That Will Not Break '*************************************************************************** Public Shared Function AddTwoNumbers(ByVal x As Long, ByVal y As Long) As Long Try Return x + y Catch ex As Exception Return 0 End Try End Function

Storing logging data in a database serves two purposes: First, the data is persisted, and second, the applications residing outside the domain of the application being logged can access and analyze the data. The log4j API provides the org.apache.log4j.jdbc.JDBCAppender object, which is capable of putting logging information in a specified database. It does simplistic jobs such as opening a database connection by reading JDBC connection parameters passed to it, writing the data to one or more tables following a specified SQL statement, and closing the connection. We can extend the functionality of the JDBCAppender object to meet our needs. At present, JDBCAppender operates in the following manner:

In this chapter, we looked at the polygon-based game Asteroids. This game presented new challenges due to the lack of polygon support in the Android API. To overcome this limitation, we created two helper classes: Rectangle and Polygon. This code has been ported from the Java SE API and slightly modified for this game. You also learned how to build a PolygonSprite capable of remembering X and Y coordinates and an angle of rotation. PolygonSprite is also capable of detecting collisions with other PolygonSprites and drawing itself in the Android canvas. With these classes, we have built the arcade classic Asteroids. Furthermore, we have looked at the game s inner workings such as a user-defined XML layout and manipulation of game resources such as audio files and icons. You have also taken a look at the critical steps in the game life cycle: initialization, drawing, and updating physics, as well as the caveats of drawing the polygons in the Android canvas. Finally, you learned at how to process key and touch events, and you tested Asteroids in the emulator. I hope that you have learned new interesting techniques in building pure Java games. In the following chapters, I switch gears to concentrate in hybrid games, which mix Java and C thru JNI for maximum performance. We ll begin with the always-interesting subject of OpenGL.

can only steal the password hashes, and password hashes are worthless because they can t be decrypted. So hashing protects user credentials in the event of a database break-in.

You generate hash values using a hashing algorithm. Hashing algorithms are responsible for processing an input and producing a specific hash value for the input. In other words, if you hash a specific value twice, then you get back the same hash value both times. Hashed values are not unique, so you could receive the same hash value for two different inputs, although that s highly unlikely given today s hashing algorithms. Let s take a look at a simple hashing algorithm so you can see how one works. Listing 12-13 shows a simple hashing algorithm that accepts a string and outputs an integer as the hash value. Listing 12-13. MyHashAlgorithm Example '*************************************************************************** Private Function MyHashAlgorithm(ByVal input As String) As Integer Dim charArray() As Char = input.ToCharArray() Dim hashValue As Integer = 0 For Each c As Char In charArray hashValue += Asc(UCase(c)) Next Return hashValue End Function MyHashAlgorithm accepts the string variable input as its only parameter. The function turns input into a character array and declares hashValue as an integer. It then iterates through each character in the string, uppercases it, and adds up the ASCII code value of each character in the hashValue variable. Finally, the function returns hashValue, which contains a summation of the character codes from the string. Table 12-5 contains a list of input values and their corresponding hashed values as calculated by the MyHashAlgorithm.