Java How to Program, Early Objects, 11th Edition

... parameters and can be overloaded. In this example, the enum constructor requires two String parameters—one that specifies the book’s title and one that specifies its copyright year. To properly initialize each enum constant, we follow it with parentheses containing two String arguments.

The second part (lines 15–32) declares the enum type’s other members—instance variables title and copyrightYear (lines 15–16), a constructor (lines 19–22) and two methods (lines 25–27 and 30–32) that return the book title and copyright year, respectively. Each enum constant in enum type Book is an object of enum type Book that has its own copy of instance variables.

Using enum type Book

Figure 8.11 tests the Book enum and illustrates how to iterate through a range ...