No matter how many tricks a writer uses to detect errors, some always creep in and these often leap off the page for a fresh reader.
Because the feedback provided by astute readers has been so valuable to me, Ive developed several versions of a feedback system called BackTalk (conceived with the aid of Bill Venners, and implemented with the help of numerous others, using several different technologies). In the electronic version of this book, freely downloadable from www.BruceEckel.com, each paragraph in the text has its own unique URL that will produce an email that will register your comment in the BackTalk system, for that particular paragraph. This way its very easy to track and update corrections. If you discover anything you believe to be an error, please use the BackTalk system to submit the error along with your suggested correction. Your help is appreciated.