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Security=SSPI"; ReportLookUpData lookUp = new ReportLookUpData(); SqlConnection connection = new SqlConnection(myConn); //Data retrieval code.. return lookUp; } } While Steve was creating his data access component, Andrew was working on a data access component for another report Andrew s experience told him that hard-coding the connection string would not be the best choice, so he decided to use the application's configuration file to store the connection string Finally, Sue was working on yet another data access component for the report she was creating, and she decided to store the connection string in the Windows registry From the developers standpoint, the application is ready to be deployed in the production environment, with the connection strings hard-coded, stored in the Windows registry, and stored in the application configuration files A few months pass, and a new developer named Tim joins the company.

//Blit the tile from the tile sheet onto the //background bitmap using the //drawGameObject method (discussed ahead) drawGameObject(platform, _backgroundBitmapData); break; // } This code creates a TileModel object called platform, and sets some of its initial properties It assigns the tileSheetColumn and tileSheetRow values that we figured out earlier: platform.tileSheetColumn = tileSheetColumn; platform.tileSheetRow = tileSheetRow; It assigns its mapRow and mapColumn properties to the loop s current mapRow and mapColumn properties: platform.mapRow = mapRow; platform.mapColumn = mapColumn; It assigns its height and width values to the maximum height and width of tiles in the game: platform.width = MAX_TILE_SIZE; platform.height = MAX_TILE_SIZE; The code then sets the tile s actual x and y stage position: platform.setX = mapColumn * MAX_TILE_SIZE; platform.setY = mapRow * MAX_TILE_SIZE; This bit of code highlights a very important calculation. If you multiply the size of the tile by the current column or row number, you can find its x and y positions on the stage. For example, we know that the tile size is 64. If the tile is at column number 6 and row number 3, you can find its x and y positions like this: x = 6 * 64 x = 384 y = 3 * 64 y = 192 That turns out to be a very important fact, as you shall soon see. But there s also a flip side to this. If you know an object s x and y positions, you can also find out which map column and map row it s in. Just divide the x and y positions by the tile size. For example, let s take the x and y values we just looked at. x = 384 y = 192 Divide these numbers by the tile size, which is 64.

Tim is tasked with changing database providers from SQL Server to Oracle Tim immediately sees an issue with Steve s hard-coding of the connection string, so he opts to use a text file to store the connection string for the application Now Tim not only has to modify each data access component but he also must discover how the connection strings were stored and modify all the storage mechanisms in order to change the connection string between the development, integration, and production environments For the very smallest of applications, this may not be a big deal However, for very large applications, where there may be hundreds of data access components that require connection strings, this can become a maintenance nightmare Having a common, consistent way of handling connection strings is most beneficial from both the development and administrative points of view.

Bitmaps have no information about the shapes they re testing. They figure out which parts of the bitmap they need to test by methodically comparing every pixel from bitmap A against every other pixel in bitmap B. They just throw them all against a wall and see which of them stick. For example, if you re testing two 100-by-100 bitmaps, each bitmap has 10,000 pixels that must be checked against 10,000 pixels in the other bitmap. Thankfully, this is done by super-optimized C++ code running in Flash Player, and it takes many shortcuts. But it s still hugely taxing. If you have any more than a small handful of objects using bitmap collision in your game, the frame rate will drop dramatically.

public class GenerateHeader extends HttpServlet { protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException { resp.addHeader("Cache-Control", "Public, max-age=3600"); resp.addHeader("Expires", "Fri, 30 Oct 2006 14:19:41 GMT"); resp.setContentType("text/html"); PrintWriter out = resp.getWriter(); out.println("<html><body>Hello world</body></html>"); } }

Programmers refer to the technique of trying every possible combination to solve a problem by the very colorful term brute force. Usually you want to avoid brute-force checking because it s so extremely inefficient. But sometimes it s the only way. And other times, brute force can actually be faster, if it the alternative solution involves doing a lot of very complex, CPU-intensive calculations.