I have no idea if this is the actual reason, but I think there was a time when private methods were started with an
_, so make it clear to oder developers not to use this method outside of the class. I think this is still heavily used in other languages like Python and PHP. The trailing
_ seem to be used to avoid naming conflicts. Since this is not Java naming standard, I would vote to rename the methods, unless there is a good reason for the naming, but I cannot see one right now.