code: public final Cache2kBuilder<K, V> name(Class<?> _class, String _fieldName) {
      if (_fieldName == null) {
        throw new NullPointerException();
      }
      config().setName(_class.getName() + "." + _fieldName);
      return this;
    }
docs: Constructs a cache name out of the class name and field name. Result example:
  {@code com.example.ImagePool.id2Image}
  
  <p>See {@link #name(String)} for a general discussion about cache names.
  
  @see #name(String)