While it's obviously questionable from a technical perspective you can argue that Java, as a fairly good trade-off between abstraction and power, is faster (in

While it's obviously questionable from a technical perspective you can argue that Java, as a fairly good trade-off between abstraction and power, is faster (in terms of development iteration) than a lower level language and lighter than using a full blown engine (like unreal engine). I don't think he chose Java so much as that was simply what he knew at the time.