Use Java please, and the method to find subset must use recursive method. Thank you

Write a program to read a list of unique integers from keyboard as the set elements, and then print out all the subsets of this set. Getting all the subsets of the set should be done through recursive method. You could ask for size of the list first or you could use a flag to denote end of the list. For example, suppose we have set {1, 2}, your program should print out (the print out order does not matter): {} {1} {2} {1, 2}