code: public boolean replaceAll(final K key, final Collection<?> oldValues, final E newValue) {
          final V val = valueMap.get(key);
  
          if (val == null) {
              return false;
          }
  
          if (val.removeAll(oldValues)) {
              val.add(newValue);
              return true;
          }
  
          return false;
      }
docs: Replaces all of the specified <code>oldValue</code> with the specified <code>newValue</code>.
  <code>False</code> is returned if no <code>oldValue</code> is found.
  
  @param key
  @param oldValues
  @param newValue
  @return <code>true</code> if this Multimap is modified by this operation, otherwise <code>false</code>.