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

import java.util.Set;
import com.google.common.collect.*;

Set> sets = Sets.powerSet(ImmutableSet.of(1, 2, 3));