Step 1: Create a File object that directs to the location you desire Step 2: Invoke File#mkdirs() to create the folder at that location Code (Java): File file = new File("path/to/your/folder/"); file.mkdirs(); This is just basic Java rather than anything to do with the Bukkit API. I recommend taking a read on File objects because they are rather useful. Also, this thread would likely go under the Spigot Plugin Development forum, unless you're creating a BungeeCord plugin, in which case you're in the right area
