CISC370-010 Project 1

Objective

The problem

Consider two hypothetical investors. By the time they were age 30, Matt and Nanette had each had $15,000 invested in an IRA earmarked for retirement. Nanette never made another contribution, but her investments returned 9% a year. Matt continued to contribute $2,000 each year, but was more conservative than Nanette and only achieved a 4% return each year. Although she had not made additional contributions, after 35 years, Nanette had accumulated more money in her account. How? ...

Or

Consider two hypothetical investors. Johnny and Susie both opened Roth IRAs. Johnny started investing for retirement at 45 and at retirement, in 20 years, will have $128,005. While Susie started investing when she was 24 and will have over a million dollars at retirement. Both of these situations assume yearly contributions of $2000 and an annual return of 10%.

The Assignment

The result will be a Java application that can be used to calculate a projected return on an investment. In future homeworks we will expand on this command line example to a GUI application and also an applet which could be on a web page.

Since this course is also about the WWW the example program to get the logic of what needs to be done is given in Perl. Perl is a scripting language that is used widely on the WWW and is very similar to C in structure. Variables in Perl start with a $. If you want to run the example, download the above and make it executable, (chmod +x roi.pl), change the first line as needed on your system, and run it (i.e ./roi.pl).

Your assignment is to convert the above Perl program to Java. Call the public class ROI and put your code into an ROI.java file.

The usage will be like this on the command line: java ROI INITIAL ADDITION RETURN PERIODS
For example: java ROI 4000 2000 11 40

You should use the Integer.parseInt() method to parse command line arguments to integers. The DecimalFormat class can be used to output the results in a monetary form. See The Java Tutorial, the text or other reference for more info on these classes. (Note: The numbers are given as command line arguments, not read in from standard input.)

Your code should also be well documented in javadoc format. You should also run javadoc on your source and include the output on your homepage in a cis370/proj1 subdirectory. If you do not use the composer webserver make sure your TA knows the proper URL. Be sure to only make your documentation public, not any of your actual code.

You can assume that the input given will be numbers.

Sample output

	% java ROI 4000 2000 9 10
	year amount
	0   $4,000.00
	1   $6,360.00
	2   $8,932.40
	3   $11,736.32
	4   $14,792.58
	5   $18,123.92
	6   $21,755.07
	7   $25,713.03
	8   $30,027.20
	9   $34,729.65
	10   $39,855.31

Grading

Turn In

Run the following:

script proj1.scr
cd to your proj1 directory
./proj1-run.sh
exit