If you can be flexible enough with the definition of 'full-featured' to read as 'able to run/produce more', I would argue that 'the browser' – if it encompasses

If you can be flexible enough with the definition of 'full-featured' to read as 'able to run/produce more', I would argue that 'the browser' – if it encompasses http, html, javascript, and css – is more full-featured than Java. And we wouldn't even need to argue that the former's install base towers over the latter's.