/*

Ðåàëèçóéòå ìåòîä, âû÷èñëÿþùèé ñèììåòðè÷åñêóþ ðàçíîñòü äâóõ ìíîæåñòâ.

Ìåòîä äîëæåí âîçâðàùàòü ðåçóëüòàò â âèäå íîâîãî ìíîæåñòâà. Èçìåíÿòü ïåðåäàííûå â íåãî ìíîæåñòâà íå äîïóñêàåòñÿ.

Ïðèìåð

Ñèììåòðè÷åñêàÿ ðàçíîñòü ìíîæåñòâ {1, 2, 3} è {0, 1, 2} ðàâíà {0, 3}.

*/

public static <T> Set<T> symmetricDifference(Set<? extends T> set1, Set<? extends T> set2) {

Set<T> symmetricDiff = new HashSet<T>(set1);

symmetricDiff.addAll(set2);

Set<T> tmp = new HashSet<T>(set1);

tmp.retainAll(set2);

symmetricDiff.removeAll(tmp);

return symmetricDiff;

}