CS 280 Spring 2008

Assignment 2 –Simple GUI and Simple Calculations

100 points

Assigned: 01/23/2008

Due: 01/30/2008 at the start of class

Pre-Lab (Do Before Lab):  Bring materials – a USB for a take home copy. Plan out your GUI, tasks, objects, and events needed for program.

Main Assignment:

Imagine that you are writing a very basic program for an ethical ticket broker.  According to PA state law, tickets can only be sold for 25% above their face value or $5.00 above their face value (whichever is greater). Imagine that they want a program to calculate the maximum price they could legally charge under each of the two provisions, given ticket face value (since we haven’t covered branching yet, leave it to the humans to figure out which is greater).  Write a program that calculates 25% above and $5.00 above face value prices and displays them. Provide capabilities to calculate, clear the text boxes to start again, and to exit.

· Also, put your name on the GUI form as a jlabel.

· You’re just beginning at setting up GUIs. Don’t worry too much about making the interface nice.  

Hand in:

• Compressed (zipped) folder with entire project containing all files related to the project, submitted to Blackboard. Please set the name of the project to something other than the default name (JavaApplication1, …). It is helpful if you use a name that identifies you as well as the assignment (e.g. yourlastname assignment 2).
• Print out of your code.

Miscellaneous:

o Define the 25% and $5 as constants, so that if the law changes the program is easy to change. If we haven’t covered that in class yet, Java constants are defined like:

• final double NJ_SALES_TAX_RATE = 0.07;   // NJ sales tax rate
• The “final” indicates it is a constant – cannot be changed.
• The use of ALLCAPS is a convention

o We won’t have covered formatting output to show currency or number of decimal places; don’t worry about that.

o Note that we haven’t done anything yet with making sure the user enters something reasonable – don’t worry about that.

o MAKE SURE YOUR PROGRAM WORKS! (i.e. gets the correct answers).

• Put YOUR NAME, date (IDE should put in for you), e-mail address and purpose of the program in comments at the beginning of the program. The purpose should be what the program should do, not the learning goals.
• Indent to show any structure of the program (The IDE usually does this well)
• Name all jlabels, jbuttons, etc that will show up in code meaningfully.

o You MUST include some comments that explain your program in order to get full credit (for this program, these can be pretty minimal).