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The JDK 7 Project
The JDK7 project on java.net is the first place to look for Java 7 updates. This project releases binary snapshots of Java 7 every two weeks. If you want to try out a new feature of Java 7, downloading a binary is the easiest way to get yourself up and running. (Note that the JDK7 project is not the same thing as the OpenJDK; more on that below.)
Each new binary snapshot includes a list of bugs fixed and features added. It is still early in the Java 7 development cycle, and so far, the change lists for these early builds have been pretty dull. They have included updates to Javadoc comments, fixes for obscure regressions, and incomprehensible tweaks to the hotspot VM, but very little in the way of new APIs to try out.
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