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case CanvasKEY_NUM8: return '8'; case CanvasKEY_NUM9: return '9'; } } Accelerating Loops Loops can be improved in several ways You can move method calls and calculations outside of the loop, use better termination conditions, and unroll loops A typical loop header is for ( int i = 0; i < listsize(); i++ ) A simple yet effective improvement is to run the list from top to bottom instead: for ( int i = listsize(); --i >= 0; ) In this case, the listsize() call is done only once at the start of the loop You have also improved the termination condition by checking against the value 0, which is slightly faster than comparing a variable against a different number If you do any calculations inside the loop, check whether you can do them outside of the loop as well.

updateProjectStatistics(); } finally { txcommit(); } } catch (Exception e) { // handle exceptions from UserTransaction methods // .. } } // ....

Now that we have described how to define Java EE components and make use of services such as transaction management that are provided by the application server, we can demonstrate how to put these components to work. Once again we must caution that this is not an exhaustive overview of these technologies, but is provided by way of introduction to Java EE to put the upcoming persistence examples in context and for developers who might be new to the platform.

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The same applies to the creation of temporary objects, which not only decreases the available memory, but also requires more frequent garbage collection A very low-level optimization is to unroll loops To successfully unroll a loop, you need to know the number of possible invocations in advance When your loop is always executed a multiple of four times, for example, you can repeat the loop body four times, reducing the number of needed jumps and termination checking by a factor of four Listing 16-8 shows an example in which an array that contains either four elements or a multiple of four elements is filled with integer values The slowFill() method uses a traditional loop, whereas the fastFill() method unrolls the loop Listing 16-8 Accelerating Loops by Unrolling public void slowFill( int[] numbers ) { for ( int i = numbers.

For good measure, you re going to do one last thing and that s to create a trigger for the marker s click event when the map loads. This is placed right after the code for the marker event listener. google.maps.event.trigger(marker, 'click');

A client of a stateless session bean is any Java EE component that can declare a dependency on the bean. This includes other session beans, message-driven beans, and servlets. Two-tier access from a remote client is also possible if the bean defines a remote business interface. Consider the servlet shown in Listing 3-24, which uses the EJB from Listing 3-2 to obtain a message and then generates a simple HTML page. As discussed earlier in the section on dependency management, the @EJB annotation causes the HelloService bean to be automatically injected into the servlet. Therefore, when the doGet() method is invoked, methods on the business interface can be invoked without any extra steps. Listing 3-24. A Servlet That Uses a Session Bean public class HelloServlet extends HttpServlet { @EJB HelloService bean; protected void doGet(HttpServletRequest request, HttpServletResponse response) throws IOException { String name = request.getParameter("name"); String message = bean.sayHello(name); PrintWriter out = response.getWriter(); out.println("<html>" + "<head><title>Hello</title></head>" + "<body><p>" + message + "</p></body>" + "</html>");

length; --i >= 0; ) { numbers[ i ] = i; } } public void fastFill( int[] numbers ) { // warning: this will crash if numberslength != x * 4 for ( int i = numberslength; --i >= 0; ) { numbers[ i ] = i; numbers[ --i ] = i; numbers[ --i ] = i; numbers[ --i ] = i; } } Setting Default Values of Instance Fields All instance fields have default values that you don t need to set again Primitive numbers such as int, long, and float are all 0 by default; boolean fields are false; and objects are null This is a rare example of a low-level optimization that you should always apply To be more precise, ..

In the case of session beans that depend on other session beans, note that it is always safe to declare a reference to a stateless session bean and store it in a field on the bean. The bean reference in the case of a stateless session bean is itself a stateless and thread-safe object.

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