The download should have placed into your file system either a ZIP or GZIP file containing the JavaCC software.
Depending on which you downloaded, you should go to the directory where the file was installed and type something like:
unzip javacc-3.2.zip
or
gunzip javacc-3.2.tar.gz
tar xvf javacc-3.2.tar
That completes your installation.
Once you have completed installation, add the bin directory
within the JavaCC installation to your path.
The javacc,
jjtree, and jjdoc invocation scripts/executables
reside in this directory.
You can get started quickly by looking at the examples and the associated
README files in the examples directory under the installation
directory. For additional information consult the
documentation index and the following release notes: