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Construct String from Set using any delimiter

public static String getSetAsString(Set ids, String delimiter){
   StringBuffer idsSql = new StringBuffer() ;
   Iterator it = ids.iterator();    
   while(it.hasNext()) {
        idsSql .append((Long)it.next()) ;
        idsSql .append(delimiter) ;
   return idsSql .toString().substring(0, idsSql .length()-1) ;

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