I'm assuming that you are looking for your first programming position, is  
that correct?  You might want to search out some of the example exams for  
the Sun Certified Java Programmer exam (assuming you haven't already taken  
it).  These are quite useful for detecting gaps in your knowledge of some  
of the finer points.

Beyond that, read some of the Java websites (such as java.net and  
theserverside.com) and blogs (see javablogs.com for links) to make sure  
you are up-to-date with what is going on in the world of Java.

As for books:

1). Design Patterns: Elements of Reusable Object-Oriented Software (Erich  
Gamma et. al)
Not a Java book, but probably more useful for making sure you are familiar  
with the standard patterns and terminology.  An alternative to this would  
be the Head First Design Patterns book.  I haven't read it but it is more  
recent and probably less dry.  Either way, it will help you to  
"talk-the-talk" when it comes to OO design.

2). Effective Java (Joshua Bloch)
Out-of-date but still indispensible.  For a more recent read check out  
Java Puzzlers (Joshua Bloch and Neal Gafter).  It has a slightly different  
approach but covers a lot of the stuff that has become relevant since the  
first book was published.

Dan.

Look at the recommendations on TechBookReport (see the right hand side
of  the page): http://www.techbookreport.com/JavaIndex.html

Also worth taking time to look at the official Sun Java tutorial:
http://java.sun.com/docs/books/tutorial/index.html