Obtaining a powerset of a set in Java

Question

The powerset of {1, 2, 3} is:

{{}, {2}, {3}, {2, 3}, {1, 2}, {1, 3}, {1, 2, 3}, {1}}

Let\'s say I have a Set in Java:<

Answer 1

package problems;

import java.util.ArrayList;
import java.util.List;

public class SubsetFinderRecursive {
    public static void main(String[] args) {
        //input
        int[] input = new int[3];
        for(int i=0; i values = new ArrayList();
}