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I was asking about the main Method because I am don't see isHeavyBook() invoked anywhere in you Book Class I might just be missing it though. I am unsure how it is suppose to be implemented without...

Well the getters you have don't really prove the need for an argument to be passed down to them.
For example


Book b = new Book();
b.setTitle("Some book");
System.out.println("Title: " +...

A few questions for you:
1. Why do you pass a getter an argument? public double getRetailCost(double bookCost)
To invoke it the programmer would have to write out Book.getRetailCost(3.99); or any...