Java is the most used programming language in the world (https://www.tiobe.com/tiobe-index/)
It not only powers all kinds of desktop things, it is foundational to Android, which currently powers ~85% of all mobile devices.
How can you get more penetration than "most used programming language" and "foundational to the largest mobile OS"? I mean there isn't even a category that fully encompasses the degree of dominance of Java. The next step, I assume, would be to rename "Programming" (all of it) to "Java".