Disjoint two collections : Collection « Collections Data Structure « Java

Disjoint two collections

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import java.util.Collection;
import java.util.Iterator;

public final class CollectionsUtil {

    public static boolean disjoint(Collection c1, Collection c2) {
        if (c1.size() > c2.size()) {
          Collection c = c1;
          c1 = c2;
          c2 = c;
        for (Iterator iterator = c2.iterator(); iterator.hasNext();) {
          Object o = (Object)iterator.next();
          if (c1.contains(o)) {
            return false;
        return true;



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