Big Java & Java Concepts example project "rectangle"

You can use this project as follows:

 - invoke the main method of the compiled class by right-clicking on the class
 representation and selecting the main method.
 
This project illustrates concepts covered in "Big Java" and "Java Concepts", Chapter 2 
"Using Objects".

 - to understand the concepts of classes and objects
 - to realize the difference between objects and object references
 - to be able to call methods