You can install as many
different Java Runtime Environments (JREs) as you like. JREs are used to
run and debug java programs. Your JREs are managed on the Installed
JREs preference page.
A JRE definition consists of:
The type of the JRE (e.g. Standard VM or Standard 1.x.x VM)
A name
The location where the JRE is installed
The system libraries containing the Java system classes (like
java.lang.Object). Optionally, the system libraries can be associated
with:
the source file
containing the source for the classes in the JRE's CLASS files
Other information needed by the VM to build, run and debug
applications.
You can switch the
default JRE for the workbench. The default JRE is used by default when
building, running, and debugging applications. Alternatively, projects
may specify a specific
JRE that they should be built and run with.