Contanate two strings in velocity -

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i try contanate 2 strings in velocity build html table. want e.g. in java +=. possibility that? can't find something.

sourcecode looks this, know operation += doens't work:

#foreach ($event in $allevents)      #set ($longstring = $longstring += "<th>$event</th>") #end

somebody idea how solve without array?

that be:

#foreach ($event in $allevents)      #set ($longstring = "$!longstring<th>$event</th>") #end

or (maybe faster):

#set($longstring = '') #foreach ($event in $allevents)      #set ($longstring = $longstring.concat("<th>$event</th>")) #end

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