How to effectively add Constants values into a ListBox in GWT?

Ok, say I have a Label and a ListBox in UiBinder

<g:Label ui:field="countryLabel" />  <g:ListBox ui:field='countryListBox' visibleItemCount='1' />  

In MyConstants.properties file

country=Country  england=England  america=America  japan=Japan  ....  

in Presenter or View

countryLabel.setText(myConstants.country());   

This is so easy for Label since we only need to set Text 1 time but it will be very time consuming if we do the ListBox

countryListBox.addItem(myConstants.england());  countryListBox.addItem(myConstants.america());  etc... there will have 200 countries out there  

So my question is, is there any quicker way to effectively add Constants values into a ListBox in GWT? 

http://stackoverflow.com/questions/26074732/how-to-effectively-add-constants-values-into-a-listbox-in-gwt

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