Rating: 

While tiny, the guide contains the following:

Part I. Language
Chapter 1: Naming Conventions
Chapter 2: Lexical Elements
Chapter 3: Fundamental Types
Chapter 4: Reference Types
Chapter 5: Object-Oriented Programming
Chapter 6: Statements and Blocks
Chapter 7: Exception Handling
Chapter 8: Java Modifiers

Part II. Platform
Chapter 9: Java Platform, SE
Chapter 10: Development Basics
Chapter 11: Basic Input and Output
Chapter 12: Java Collections Framework
Chapter 13: Generics Framework
Chapter 14: Concurrency
Chapter 15: Memory Management
Chapter 16: The Java Scripting API
Chapter 17: Third-Party Tools
Chapter 18: UML Basics

The book is well organized and well written. It contains micro-snippets of code for virtually every topic covered. It's a helpful book to keep around for review or quick lookups. If you are new to Java but already a programmer of another object-oriented language, you could read it to get a quick, high-level overview. I have found it to be among the most useful Java books I own.