How to know enhancements in the JDK when a new version is released?

Hello:
Java is releasing new versions of its JDK frequently. So, I would like to know what new features bring each version of JDK. I mean, I've just found this page: [http://java.sun.com/j2se/1.5.0/docs/guide/language/]. This page has documentation about enhancements in JDK 5 and also some examples of this enhancements.
However, I didn't find a page which can show me the enhancements in JDK 6. I mean, Java will continue releasing new versions of JDKs in the future. My question is, how a java programmer can update his knowledge about new features that will bring future versions of JDKs?. Is there any subscription or something like that in order to get notifyed and be able to learn what's new on every new version of JDKs?.
Thanks for your answer.
Bye.

A quick google search turned up [this page|http://java.sun.com/javase/6/webnotes/features.html], which seems to have it all.
Note that there is no direct equivalent to the page you linked to (language changes), because Java 6 didn't have any major changes in the Java language, while Java 5 introduced quite a few of those (generics, enum, annotations, ...).

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