Recorded under JSR 203, state as the major feature of the JDK 7. It mainly features 3 primary elements that offer new input/output API for the JAVA.
The latest API update provides the developer a better way to program IO related operations, which strive to solve some tedious programming / security issues that bug the developer for years.
source: http://java.sun.com/developer/technicalArticles/javase/nio/