First, have a look at the detailed steps to check your Java version and install it.
Installing the Nuxeo Platform From the ZIP Archive
Install the Nuxeo Platform
Download the ZIP archive from the Nuxeo distribution download site and unzip it using your favorite tool.
You should contact your Nuxeo Administrator or Nuxeo sales representative to get access to this distribution.
Do you want to evaluate the platform? You can now start the server.
You want to do a complete installation, that is compatible for a production environment? You should prepare your environment now.
Getting Familiar with the Nuxeo Platform