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Most people think of encryption as a two-way process. You encrypt data and you decrypt data. It goes two ways. Hashing is a form of encryption known as one-way encryption that creates an encrypted value, called a hash value, which can t be definitively decrypted. There is simply not enough information in the hashed value to restore the original encrypted message. Hashing is useful for communicating that you know something without actually communicating what you know. For example, you and a friend both claim to know the capital of Peru. You think your friend is bluffing. Your friend thinks you re bluffing. Neither of you want to say the answer outright because it could give the answer away to your opponent. How can you both determine whether or not you both know the capital without actually divulging the answer This is a situation where one-way encryption can help communicate that you know something without actually communicating what you know. You tell your friend to hash the value of the capital using a specific algorithm. You also hash the value of the capital using the same algorithm. If both hashed values match up, then you can both reasonably assume you know the answer. Hashing is also used to encrypt passwords in databases. Users log in by entering their plain-text password. That password is then hashed and checked against the hashed password stored in the database. If the hashes match up, then the user is authenticated. This keeps hackers and rouge database administrators from stealing passwords out of the database. They

The program in Listing 3-12, AsyncLogging.java, uses the async.xml file defined in Listing 3-11 as its configuration source. This example simply sets the buffer size to 4 for the AsyncAppender being used. The AsyncAppender will not print any message so long as the number of logging events is less than the buffer size. Once the number of logging events exceeds the buffer size, the buffer is flushed and all the messages will be printed. Listing 3-12. AsyncLogging.java package com.apress.logging.log4j; import org.apache.log4j.*; import org.apache.log4j.xml.DOMConfigurator; public class AsyncLogging { //private static Logger logger Logger.getLogger(AsyncLogging.class.getPackage().getName()); private AsyncAppender asyncAppender = null; private ConsoleAppender consoleAppender = null; /** Creates a new instance of AsyncLogging */ public AsyncLogging() { try { logger.setAdditivity(false); asyncAppender = (AsyncAppender)logger.getRootLogger().getAppender("ASYNC"); asyncAppender.setBufferSize(4); }catch(Exception e) { System.out.println("error: "+e.toString()); } } /** This method simply logs the messages */ public void doLogging() { logger.debug("Hello 1"); logger.debug("Hello 2");

Before we get into a more advanced discussion about exception management, you need to have a solid understanding of exception-management basics. What are exceptions What are their benefits and drawbacks How can they be handled accordingly After you have a grasp of these concepts, it will be easier to see how you can use proper exception-management techniques to manage customer perception and fortify your code.

(http://www.apress.com). You can find the more advanced examples by running the application and selecting the appropriate sample from the menu on the left side of the page.

if (keyCode == KeyEvent.KEYCODE_M && loaded) { if (sound) { crashSound.stop(); explosionSound.stop(); fireSound.stop(); missileSound.stop(); saucerSound.stop(); thrustersSound.stop(); warpSound.stop(); } else { if (misslePlaying && !paused) missileSound.loop(); if (saucerPlaying && !paused) saucerSound.loop(); if (thrustersPlaying && !paused) thrustersSound.loop(); } sound = !sound; } /** * 'S' key: start the game, if not already in progress. */ if (keyCode == KeyEvent.KEYCODE_S && loaded && !playing) { initGame(); } /** * 'E' Exit game */ if (keyCode == KeyEvent.KEYCODE_E ) { stopUpdateTimer(); releaseSounds(); System.exit(0); // Ouch! } } Our arcade game is now complete, and we can run it in the emulator.

In the NET Framework, an exception is both a concept and an object Conceptually, an exception arises when your application attempts to complete an operation, but the operation fails for one reason or another Or more simply put, an error occurs Instead of continuing as though the error never occurred, the NET Framework stops the execution of the current code block and reports the error by throwing an exception When an exception is thrown, an exception object is created and populated with information about the exception and why it occurred This object is useful for taking corrective actions, informing the user of a problem, or for debugging purposes All exceptions derive from the same base class, SystemException, so they share a number of common properties.

logger.debug("Hello 3"); //logger.debug("Hello 4"); //logger.debug("Hello 5"); } /** the main method */ public static void main(String args[]) { AsyncLogging demo = new AsyncLogging(); demo.doLogging(); } } Executing this program will not produce any logging messages, as the buffer size for the AsyncAppender is set to 4, and we are logging only three events. If we uncomment the two other logging events, numbered 4 and 5, and we will see these messages printed in the console as follows: 2002-10-13 2002-10-13 2002-10-13 2002-10-13 2002-10-13 14:05:34,198 14:05:34,218 14:05:34,218 14:05:34,218 14:05:34,218 DEBUG DEBUG DEBUG DEBUG DEBUG [main] [main] [main] [main] [main] Hello Hello Hello Hello Hello 1 2 3 4 5