用google找找，网上的教材多而杂，杂而不全，想要彻底看个明白，那得花很长的时间在网上到处找才行

why don't u try java.sun.com. If you could read all the X X X X Xation on java library, that helps a lot. And there have tutorial and exam material too.
mysql is basically a database, familiar with any kind of database will help out. Maybe you should read more on SQL code, "insert", "delete", and so on.
Don't really know about "SCHEME"

你最好是自己買書吧

去鹰盟论坛
http://211.155.27.112/bbs/forumdisplay.php?s=&forumid=2
 
尤其是下面这个帖子书多得让你眼花缭乱
http://211.155.27.112/bbs/showthread.php?s=d815123b6f5c58f9c8ea20c57a186fd7&threadid=20674

如果是java的入门书,我知道机械工业出版社有一套上下本的很好,不过是纸书,网上不知有没有.作者是参与制定c语言行业标准的委员会委员,写的不错!