Java™ How To Program (Early Objects), Tenth Edition

29.2.2 Relationships Between Tables in the Entity Classes

We did not mention the books database’s AuthorISBN table. Recall that this table links:

• each author in the Authors table to that author’s books in the Titles table, and

• each book in the Titles table to the book’s authors in the Authors table.

The NetBeans IDE’s JPA object-relational mapping tools do not create a class for the AuthorISBN table. Instead, relationships between tables are taken into account by the generated entity classes:

• The Authors class contains the titlesList instance variable, which contains a List of the Title objects representing books written by that author.

• The Titles class contains the authorsList instance variable, which contains a List of the Author objects ...