Big Java example project "measure2"

You can use this project as follows:

  - invoke the main method of the driver class DataSetTest by 
 right-clicking on the class representation and selecting the main method.
  
This project illustrates concepts covered in Big Java, Chapter 9 
"Interfaces and Polymorphism".

 - to learn about interfaces
 - to be able to convert between supertype and subtype references 
 - to understand the concept of polymorphism 
 - to appreciate how interfaces can be used to decouple classes 
 - to learn how to implement helper classes as inner classes 
 
