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Notice that the data is passed to StatApplet through an HTML parameter called data. This string contains a comma-separated list of values. StatApplet uses a StringTokenizer to retrieve each individual value in its String form. As each value is read, it is added to an ArrayList object referred to by al. ArrayList is a collection class that supports a dynamic array that grows as needed. When the user presses the Display Statistics button, the actionPerformed( ) method is executed. Because a StatsWin object requires an array of type double, not an ArrayList, as a parameter, the strings in al must be converted into double values and copied into an array. After this has been done, a StatsWin object is created and the statistics are displayed. Sample output as produced by the Applet Viewer is shown in Figure 8-5. An applet like this would make a great addition to many Web sites.
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Here are some ideas that you might want to try. As explained, the graphing methods and the regress( ) method operate on only one set of data that corresponds to the Y values. The X values are time. You might want to create a second set of these methods that takes two arrays as arguments, with the second array specifying the X values. You might find it interesting to allow the user to rotate the axes of the graphs, perhaps in real time. You might want to allow the user to specify the width of the bars in the bar graph or the shapes of the points in the scatter graph. Finally, you might want to experiment with embedding a graph window within the StatsWin window instead of making them stand-alone windows. In this approach, you could use the check boxes to determine which type of graph was displayed within the dedicated graph window.
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Figure 8-5
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Sample output from the StatApplet applet
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CHAPTER
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Financial Applets and Servlets
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The Art of Java
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espite all the large, sophisticated applications, such as word processors, databases, and accounting packages that dominate much of the computing landscape, there has remained a class of programs that are both popular and small. These perform various financial calculations, such as the regular payments on a loan, the future value of an investment, or the remaining balance on a loan. None of these calculations are very complicated or require much code, yet they yield information that is quite useful. As most readers will know, Java was initially designed to support the creation of small, portable programs. Originally, these programs took the form of applets, but a few years later servlets were added. (Recall that applets run on the local machine, inside the browser, and servlets execute on the server.) Because of their small size, many of the common financial calculations are right-sized for applets and servlets. Furthermore, including a financial applet/servlet in a Web page is an amenity that many users will appreciate. A user will return again and again to a page that offers the calculation that he or she desires. This chapter develops a number of applets that perform the financial calculations shown here: Regular payments on a loan Remaining balance on a loan Future value of an investment Initial investment needed to attain a desired future value Annuity from an investment Investment necessary for a desired annuity These applets can be used as is or tweaked to fit your specific need. The chapter ends by showing how to convert the financial applets into servlets.
Finding the Payments for a Loan
Perhaps the most popular financial calculation is the one that computes the regular payments on a loan, such as a car or house loan. The payments on a loan are found by using the following formula: Payment = (intRate * (principal / payPerYear)) / payPerYear * numYears ) (1 ((intRate / payPerYear) + 1) where intRate specifies the interest rate, principal contains the starting balance, payPerYear specifies the number of payments per year, and numYears specifies the length of the loan in years. The following applet called RegPay uses the preceding formula to compute the payments on a loan given the information entered by the user. Notice that the RegPay class extends Applet and implements ActionListener.
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