public static <T> boolean intersectsAll(T[] a1, T[] a2) {
        for (T anA1 : a1) {
            if (!contains(a2, anA1)) {
                return false;
            }
        }

        for (T anA2 : a2) {
            if (!contains(a1, anA2)) {
                return false;
            }
        }

        return true;
    }
public static < T > boolean intersectsAll ( T [ ] a1 , T [ ] a2 ) { for ( T anA1 : a1 ) { if ( ! contains ( a2 , anA1 ) ) { return false ; } } for ( T anA2 : a2 ) { if ( ! contains ( a1 , anA2 ) ) { return false ; } } return true ; }
Determines if all values in a1 appear in a2 and that all values in a2 appear in a2.