Big Java & Java Concepts 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

This project illustrates concepts covered in "Big Java" & "Java Concepts", Chapter 6 
"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