import java.util.HashSet;

import java.util.Set;

public class SetsTest {

public static void main(String[] args) {

Set<Integer> integerSet1 = new HashSet<>();

integerSet1.add(1);

integerSet1.add(2);

integerSet1.add(3);

Set<Integer> integerSet2 = new HashSet<>();

integerSet2.add(3);

integerSet2.add(4);

integerSet2.add(5);

Set<Integer> union = Sets.union(integerSet1, integerSet2);

Set<Integer> intersection = Sets.intersection(integerSet1, integerSet2);

Set<Integer> difference = Sets.difference(integerSet1, integerSet2);

Set<Integer> complement = Sets.complement(integerSet1, integerSet2);

System.out.println(union);

System.out.println(intersection);

System.out.println(difference);

System.out.println(complement);

}

}

/* Output:

[1, 2, 3, 4, 5]

[3]

[1, 2]

[1, 2, 4, 5]

*/