Java 5 and JAva 7

Hello everyone out there. I hope this is the right group to post in.
Alright, I'm a total, Total newbie at JAva, Eclipse and the whole lot. I recently downloaded the book "Java for Dummies 2nd Edition", which is based on Java 5, and Java 7 is out, am I right?
Now the question is, would it be okay if I continue with the 2nd Edition? Or is Java 7 totally different? Thank you for your help.
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