Big Java example project "tax"

You can use this project as follows:

 - invoke the main method of the driver class TaxReturnTest by right-clicking 
 on the class representation and selecting the main method.
 - interactively create TaxReturn objects of differ incomes and marital status.
   ("S" for single, "M" for married) 
 - call the getTax method of each object 
 
Note: Sometimes in BlueJ a dialog (such as input dialog or file chooser)
 appears right at the back of any open windows.  If you cannot see
 a dialog after calling the Driver class main method, minimize any 
 other windows to find the dialog.
 
This project illustrates concepts covered in Big Java, Chapter 5 
"Decisions".
  
 - to be able to implement decisions using if statements 
 - to understand how to group statements into blocks 
 - to learn how to compare integers, floating-point numbers, strings, and objects 
 - to recognize the correct ordering of decisions in multiple branches 
 - to program conditions using Boolean operators and variables
