I saw the book in Indian markets Head Rush Ajax.The book is a combination of AJAX and PHP.Throughout the Head First Series you thought Java,then why you went for (PHP,AJAX)combination.We(Indian Markets) are eagerly waiting for Head First Ajax(java,AJAX)combination.this Topic is a reflection of those eager peoples.
Kathy and Bates we are longing for the edition.This is resemblance of million Hearts
Java and Ajax is really not going to be any different than PHP and Ajax... sure JSP and PHP files are different, as well as backend .java and .php code, but Ajax is independant of the two.
What IS different are the different libraries that can assist you. Have a look at AjaxTags. Its a library for use with Java applications and makes it pretty simple to do some basic Ajax stuff...(i.e. pre-populating drop down lists, etc).
Suggestions: google, google, google, and more google. Read up, download and play with prototype.js and scriptaculous.js which are both frameworks that make working with ajax technologies a bit easier.
The head first book is great, and really doesn't cover much PHP...they only use PHP to describe whats happening on the server side.
Ryan Headley<br /><a href="http://www.sudovi.com" target="_blank" rel="nofollow">http://www.sudovi.com</a>
In addition to the responses posted so far, I can assure you that the migration from PHP to Java (Servlets/JSP) can be done with a minimal effort as the focus in the AJAX and PHP book remains on AJAX as a technology.