There are some basic information about java programming at http://enjoy.phy.ntnu.edu.tw/mod/resource/view.php?id=8465 (in Chinese).
You will find all the mathematic functions available in java.

Detail information about all the properties in GUI elements can be found at http://enjoy.phy.ntnu.edu.tw/mod/resource/view.php?id=8468
And you can download those html files from http://www.phy.ntnu.edu.tw/demolab/phpBB/osejs/EJS_view_reference.zip