code: public static <K, V> TreeMap<K, V> newTreeMap(Map<K, V> map, Comparator<? super K> comparator) {
  		final TreeMap<K, V> treeMap = new TreeMap<>(comparator);
  		if (false == isEmpty(map)) {
  			treeMap.putAll(map);
  		}
  		return treeMap;
  	}
docs: 新建TreeMap，Key有序的Map
  
  @param map Map
  @param comparator Key比较器
  @return TreeMap
  @since 3.2.3