Get the size of this TreeSet

int size()
Returns the number of elements in this set (its cardinality).
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TreeSet:
  1. TreeSet class
  2. Create TreeSet objects
  3. Add elements to a TreeSet
  4. Get the least and greatest element in this TreeSet'>
  5. The first and last element in this TreeSet
  6. Get the head set and tail set
  7. Remove element from TreeSet
  8. Get the size of this TreeSet
  9. Get a subset from this TreeSet