The simplest way to invoke RegPayS is to link to its URL without passing any parameters.
For example, assuming that you are using Tomcat, you can use this line to execute it:
<A HREF = "http://localhost:8080/servlets-examples/servlet/RegPayS">
Loan Calculator</A>
This displays a link called Loan Calculator that links to the RegPayS servlet in the Tomcat
example servlets directory. Notice that no parameters are passed. This causes RegPayS to
return the complete HTML that displays an empty loan calculator page.
You can also invoke RegPayS by first displaying an empty form manually, if you like.
This approach is shown here, again using Tomcat's example servlets directory:
<form name="Form1"
<B>Enter amount to finance:</B>
<input type=textbox name="amount" size=12 value="">
<B>Enter term in years:</B>
<input type=textbox name="period" size=12 value="">
<B>Enter interest rate:</B>
<input type=textbox name="rate" size=12 value="">
<B>Monthly Payment:</B>
<input READONLY type=textbox name="payment"
size=12 value="">
<input type=submit value="Submit">
Some Things to Tr y
The first thing you might want to try is converting the other financial applets into servlets.
Because all the financial applets are built on the same skeleton, simply follow the same
approach as used by RegPayS. There are many other financial calculations that you might
find useful to implement as applets or servlets, such as the rate of return of an investment
or the amount of a regular deposit needed over time to reach a future value. You could also
print a loan amortization chart. You might want to try creating a larger application that
offers all the calculations presented in this chapter, allowing the user to select the desired
calculation from a menu.
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