JDK 7 is the next major release of the Java SE platform and is
currently available as an early access release. JDK 7 documentation will be
regularly updated as and when new features
are added to the JDK 7 platform. You can also expect to see changes in content for
The two principal products in the Java SE platform are: Java
Development Kit (JDK) and Java SE Runtime Environment (JRE).
The JDK is a superset of the JRE, and contains everything that is
in the JRE, plus tools such as the compilers and debuggers
necessary for developing applets and applications. The Java Runtime
Environment (JRE) provides the libraries, the Java Virtual Machine,
and other components to run applets and applications written in the
Java programming language.
The following conceptual diagram illustrates all the component
technologies in Java SE platform and how they fit together.