code: public Object get(Object key) throws ObjectManagerException {
          Entry node = find(key);
          if (node != null)
              return node.value;
          return null;
      }
docs: Answers the value of the mapping with the specified key.
  
  @param key the key
  
  @return the value of the mapping with the specified key
  
  @exception ClassCastException
  when the key cannot be compared with the keys in this
  TreeMap
  @exception NullPointerException
  when the key is null and the comparator cannot handle null