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If you re writing multithreaded code, sooner or later you will probably need to have at least some information that is accessible to multiple threads, and which occasionally needs to be changed isolation and immutability are sometimes simply not options. In this case, you ll need to synchronize access to the data for example, anytime shared information is being modified, you ll need to make sure no other threads are trying to read or write that information. This requires the most discipline of any of the solutions described here, and is likely to be the most complex, but it offers the most flexibility. The .NET Framework provides a wide range of features to help you synchronize the way your threads access shared information, and these are the topic of the next section.

@PersistenceUnit(unitName = "actionBazaar") private EntityManagerFactory emf;

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The debug panel on the right reports on the internal state of the system after various user events, such as adding or removing widgets from the container. The code has been written to allow us to swap in different patterns for creation and destruction of DOM elements and cyclic references while the application is running. The user may choose between these at runtime by checking and unchecking HTML form elements on the page. When the links that add or remove boxes from the container are activated, the combination of patterns that is used to implement the user interface will match the state of the checkboxes. Let s examine each of these options and the corresponding code. Reuse DOM Nodes checkbox Checking this option will determine whether the ClickBox widget will try to find an existing DOM node when creating itself and create a new one only as a last resort. This allows the application to switch between the Create Always and Create If Not Exists patterns that we discussed in section 8.3.2. The modified rendering code follows:

Now you can start adding your properties. You will make two Boolean properties IsEdible and HasSeed and set them both to true.

Variables in the Resource class allow us to check on the state of the file (for example, its readability) and access its input stream. In the example, we use Java s BufferedReader, wrapped around an InputStreamReader, to pull data from the input stream as text. Java s reader classes know how to interpret different character encodings and

EJB 3 standardizes the persistence with the Java Persistence API, which defines POJO entities that can be used both inside and outside the container.

Now that you can store some session data in your page, you need a page that you can use to display whatever is stored in Foo. For this example, you ll use an ASP.NET AJAX polling timer (similar to the one that you used earlier) that will display whatever is stored in Foo every 5 seconds. Figure 6.11 shows how this web page looks (prior to running this page, we used the SessionAdd.aspx page to set the value of Foo to bar). To create the page displayed in figure 6.11, add a new ASP.NET page to the project called SessionTimer.aspx that contains the following markup:

create or replace procedure maximum (a in integer, b in integer, c out integer) as begin if (a > b) then c := a; end if; if (b >= a) then c := b; end if; end;

<Project DefaultTargets="FitTest"

To keep game code portable, it should not be written in Objective-C The iPhone operating system does require you to work with Objective-C (at least to get started), but game code should not be written in it The code should be written in either C or C++ C and C++ are the de facto standard programming languages today This isn t to belittle Objective-C as a language it s just not available on every platform Modern compilers combined with low-level experience can do wonders You can virtually work low level by learning the assembly opcodes that are generated by C and C++ code An understanding of assembly language goes a long way toward getting the best performance, so you rarely need to break out the moves, loads, and stores yourself anymore.

firstFraction: 3/4 secondFraction: 2/4 firstFraction + secondFraction = sumOfTwoFractions: 5/4

using getter and setter methods. Alternatively, you should know how to access HttpServletRequest, where you store your CalendarModel so that you can access it using the JSP Standard Tag Library (JSTL) in the view.

FormattingExtender ext = new FormattingExtender(); ext.ID = "FormattingExtender1"; ext.TargetControlID = txtName.ID; ext.HoverCssClass = "hover"; ext.FocusCssClass = "focus"; ScriptLibrary/FormattingBehavior.js"; ext.ScriptPath = "

Solution to Question 4-3. When you divide two doubles, the solution has a fractional portion, expressed as a decimal, as you would expect. When you divide two ints, the compiler discards any fractional remainder. Solution to Question 4-4. The purpose of the % operator is to return the remainder from an integer division. It s very useful in controlling loops, as you ll see later.

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