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You'll get out of the 21-Day book and a semester of Java what you put into them, what you CAN put into them. What you'll be able to do after that depends completely on you and the effort you put...

Knowing the differences between the two books won't help you understand Java or computer science in general except to know that it's a subject that's always evolving. I'll bet you knew that already....

If there was a Java 6 book, why would you buy a Java 2 book? From what you know about software and programming, is the older version ever preferred?

The current version is Java 7, Java 8 isn't...