If you are in a hurry, know how to program, and need to learn Java, this is great. It's the shortest book I found, and I felt much more comfortable after reading it. I found this through a recommendation in Effective Java.

Pros:
- It's really short.
- Great title.
- Doesn't try to convince you that object-oriented programming is the cool new thing.
- Gets pretty precise about why certain things are the way they are.