• No books teach this role of interfaces.
• Often taught in the order: class, implementation inheritance, dynamic binding, abstract class, interface.

In an informal analysis of when specific aspects of Java are taught by various books, I obtained the following results. When a result appears as n:p, n gives the page number and p gives the page number expressed as a percentage. So the percentage figure gives a measure of how far through the book the aspect is taught.

  Arnow  Bishop    Deitel  Garside  Horstmann  Koffman   Lewis   Smith Cornelius
How many pages are in the main part of the text?  How many in all?
725,805 479,508 1228,1344  609,660    569,624  683,824 559,857 433,474 ?470,?500
When is the user-declared class introduced?
  90:12   80:17    326:27   170:28     324:57    56:08  140:25   66:15    206:44
When are interfaces introduced?
 659:91  269:56    427:35   347:57         no   440:64  338:60  269:62    223:47