I don't think they have actually removed anything from 1.1, although
there has been a lot of differences, some things won't change others
will change quite considerably.

Going on a limb, basic  syntax will probably be the same, and even simple
Object manipulation and even some AWT stuff, but lots of stuff has been
changed since then. If I recall correctly that Threads where reworked
after 1.1, Swing was introduced, Sockets where reworked ... Lots of
really good core skills :)

As I said the book isn't useless, and can help you start. Although it
won't survive as long  as it used to.