Small java converter program

I would like you to create a small program which can
convert a binary number into a decimal number
convert a decimal to a binary
In order to accomplish this you will need to create
one Converter class
No need for a main method
In this class you need the following methods
a powers method(I would like you to make your own)
higher level use recursion
a binary to decimal method
a decimal to binary method
All methods need to have appropriate parameters and they will all need to return a value (the answer)
for those who wish to get a 6-7 you will need to push it further
You can create a hexadecimal converter
to binary
decimal
if you do to decimal you can then actually use your decimal to binary converter to convert hex to binary.
Or create a method which can do any base system (up to 16) and convert it to decimal
try adding a text based interface
using while loop to ask questions and read inputs
or using a UI
Javafx