code: @SuppressWarnings({ "unchecked" })
      public <VV> EntryStream<K, VV> selectValues(Class<VV> clazz) {
          return (EntryStream<K, VV>) filter(e -> clazz.isInstance(e.getValue()));
      }
docs: Returns a stream consisting of the elements of this stream which values
  are instances of given class.
  
  <p>
  This is an <a href="package-summary.html#StreamOps">intermediate</a>
  operation.
  
  @param <VV> a type of values to select.
  @param clazz a class to filter the values.
  @return the new stream