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The .setRow command works by passing the address of the display, the row value, and then the binary pattern of which LEDs to turn on or off. In this case, you want them all on, which is binary 11111111 and decimal 255. The purpose of Project 22 was to show how much easier it is to control an LED Driver chip if you use a ready-made library of code designed for the chip. In Project 21, you did it the hard way coding everything from scratch; in Project 22, the hard work was all done for you behind the scenes. There are other Matrix libraries available; in fact, the Arduino IDE comes with one called matrix. I had better luck with the LedControl.h library myself and so I chose that. You can use whichever library suits your needs best. In the next chapter, you will look at a different type of dot matrix display, the LCD.

On an annual basis, the CA Board assesses its performance against our published Corporate Governance Principles as well as against each of our committee charters. This is an opportunity for the Directors to reflect on the thoroughness of their knowledge of company. Are we doing what we said we were going to do Are we doing it well If we are not doing it, does it need to get done, or do our objectives need to change If we need to do it, do we have processes and measurements in place to make it happen Self-assessments are valuable at both the Board and Committee levels. In addition, there may be value in providing coaching for individual Directors to encourage a consistently effective level of participation and interaction by all Directors. Assessments in general are an invaluable means to improvement, and regulatory authorities have recognized their importance. In fact, assessments of internal controls are mandated by the Sarbanes-Oxley Act of 2002 and SEC regulations.

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ustom tags are JSP tags you create that allow you to define new functionality for your JSPs. For example, suppose we have a custom tag called <temp:F> that converts degrees Celsius to degrees Fahrenheit. We could use it in our JSPs:

Take the concepts from Projects 21 and 22 and combine them. Make a Pong Game but have the code keep a tab of the score (in milliseconds since the game started). When the ball goes out of play, use the scrolling text function to show the score of the game just played (milliseconds the player survived) and the highest score to date.

While this is a simple example meant to illustrate what custom tags are, in reality, custom tags are useful for a number of reasons: They promote code reuse because they cut down duplication of code on your JSPs. They make your JSPs more maintainable, because you can avoid using scriptlets. Their usage simplifies the work of web designers, because they obviate the need for scriptlets, which are more difficult to write and use. They are a key tool used to promote a separation of concerns (see 1). Most, if not all, web application frameworks, including Struts and JavaServer Faces, utilize custom tags for this reason. Because Struts uses custom tags extensively, it is to your advantage to understand how to create and use custom tags.

The declarations in validations.xml to perform simple validations are exactly as you ve just seen in 15 (see Listing 15-5). I ll also have to make changes to the RegistrationAction (see 7, Listing 7-3) in order to correctly read data from the ActionForm passed into execute(). I ve bolded the changes in Listing 16-5.

Summary

According to John P. Kotter of the Harvard Business School and author of Leading Change, a crisis can be seen as positive in that it garners support for long-overdue change. Crisis brings with it opportunity and is a catalyst of change.3 The 2008-2009 economic environment is such a crisis one exacerbated by the currently-developing complex interconnectedness of today s businesses, industries, and economies. Now is the time for companies and their Boards to step up and make meaningful changes in the way they address governance.

package net.thinksquared.registration.struts; import javax.servlet.http.*; import org.apache.struts.action.*; import net.thinksquared.registration.data.User; public class RegistrationAction extends Action{ public ActionForward execute(ActionMapping mapping, ActionForm form, HttpServletRequest request, HttpServletResponse response){ //get userid and password (changed!) DynaActionForm dForm = (DynaActionForm) form; String userid = dForm.get("userid"); String password = dForm.get("password"); //complex validation: check if userid exists if(User.exists(userid)){ ActionMessages errors = new ActionMessages(); errors.add("userid", new ActionMessage("reg.error.userid.exists")); saveErrors(request,errors); //navigation: redisplay the user form. return new ActionForward(mapping.getInput()); }else{ //data transformation: save the userid and password //to database:

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