472     public Object clone() {

   472     public Object clone() {

   473         TreeSet<E> clone = null;

   473         TreeSet<E> clone = null;

   474         try {

   474         try {

   475             clone = (TreeSet<E>) super.clone();

   475             clone = (TreeSet<E>) super.clone();

   476         } catch (CloneNotSupportedException e) {

   476         } catch (CloneNotSupportedException e) {

   478         }

   478         }

   479 

   479 

   480         clone.m = new TreeMap<>(m);

   480         clone.m = new TreeMap<>(m);

   481         return clone;

   481         return clone;

   482     }

   482     }