Preview:
import java.util.HashSet;
import java.util.Set;

public class Main {
    public static void main(String[] args) {

        Set<Integer> set1 = new HashSet<>();
        set1.add(1);
        set1.add(3);
        set1.add(2);
        set1.add(4);
        set1.add(8);
        set1.add(9);
        set1.add(0);

        Set<Integer> set2 = new HashSet<>();
        set2.add(1);
        set2.add(3);
        set2.add(7);
        set2.add(5);
        set2.add(4);
        set2.add(0);
        set2.add(7);
        set2.add(5);

        // intersection
        Set<Integer> setIntersection = new HashSet<>(set1);
        setIntersection.retainAll(set2);
        System.out.println(setIntersection);
    }
}
// Output: [0, 1, 3, 4]
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