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This looks pretty similar to the example while loop we saw earlier, with one addition: we re creating an object that lets us build up a collection of numbers one at a time a List<double> It s similar to an array (a double[]), but an array needs you to know how many items you want up front you can t add more items onto an existing array The advantage of a List<double> is that you can just keep adding new numbers at will That matters here because if you look closely you ll see we ve modified the code to skip over blank lines, which means that we actually don t know how many numbers we re going to get until we ve read the whole file Once you re done adding numbers to a list, you can call its ToArray() method to get an array of the correct size.

This list class is an example of a collection class NET offers several of these, and they are so extremely useful that s 7, 8, and 9 are related to working with collections Notice the return keyword near the end of Example 2-17 This is how we return the information calculated by our method to whatever code calls the method As well as specifying the value to return, the return keyword causes the current method to exit immediately, and for execution to continue back in the calling method (In methods with a void return type, which do not return any value, you can use the return keyword without an argument to exit the method Or you can just let execution run to the end of the method, and it will return implicitly.

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) If you re wondering how the method remembers where it s supposed to go back to, see the sidebar on the next page With the ReadNumbersFromFile method in place, we can now write this sort of code:.

Let s say the SQL query could be rewritten as follows: sql_query = "SELECT pizza, toppings, quantity, order_day " + "FROM orders " + "WHERE userid=" + sessiongetCurrentUserId() + " " + "AND toppings LIKE '%" + kill_quotes(requestgetParameter("topping")) + "%'"; The kill_quotes() method would eliminate each occurrence of a single-quote character If the kill_quotes() method were implemented in Java, it might look as follows: String kill_quotes(String str) { StringBuffer result = new StringBuffer(strlength()); for (int i = 0; i < strlength(); i++) { if (strcharAt(i) != '\'') resultappend(strcharAt(i)); } return resulttoString(); } The kill_quotes() method iterates through each character of its input string (str), and copies over each character that is not a quote to the output string (result) This is a blacklistingbased approach in which the quote character is blacklisted, or eliminated, from the input string.

double[] lapTimes = ReadNumbersFromFile("LapTimes.txt"); double[] fuelLevels = ReadNumbersFromFile("FuelRemainingByLap.txt");

The purpose of the page was to show the world our mashups, so we ll explore how to do that now. We will be placing the two mashups that we created earlier in the book in Zone 2 of the page layout, but to have a little more control inside of the zone, we will create a table to contain our mashups. Tables are not only used to contain tabular data but to control positioning of content similar to the zones used in the Popfly editor. This will ensure that the mashups are exactly where we want them. Close the preview window if it is still open; then, click Zone 2 to make it active. Click the Page Editor tab, and click the Table button. The Create Table dialog box appears, as shown in Figure 5-20. The dialog box lets you set many options for the table you will be inserting including Color, Color Scheme, Columns, and Rows. A preview area to the right lets you see what your selections will look like before you click OK. The preview is only for the color selection; it does not preview the layout for the number of columns and rows selected.

The Mutex class provides a similar style of locking to monitor. The name is short for mutually exclusive indicating that only one thread can acquire the lock at any time. A mutex is significantly more expensive than a monitor because it always gets the OS scheduler involved. And it does that because mutexes work across process boundaries you can create a Mutex object with a name, and if another process in the same Windows login session creates another Mutex object with the same name, that

object refers to the same underlying Windows synchronization object. So to acquire a Mutex, you don t merely have to be the only thread in your application in possession of the lock; you will be the only thread on the whole login session in possession of the lock. (You can even make a global mutex that spans all login sessions, meaning that yours will be the only thread on the entire machine in possession of the lock.) If you create a mutex without a name, it will be local to the process, but it still relies on the OS because a Mutex is essentially a wrapper around a mutex object provided by the Windows kernel.

Monitors are not just for locking, of course they offer coordination facilities through pulsing and waiting. And the .NET Framework offers some slightly more specialized types for coordination too.

Events provide a very similar service to the WaitForIt class we built in Example 16-14 an event is effectively a Boolean variable you can wait on. And rather than being a simple one-shot mechanism as in Example 16-14, an event can go back and forth between its two states. .NET offers ManualResetEvent and AutoResetEvent classes. The latter automatically reverts to its default state when letting waiting threads go, whereas the manual one remains in its so-called signaled state until you explicitly reset it.

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