Using Apache commons string substitutor, StrSubstitutor at Wednesday, March 05, 2008

import org.apache.commons.lang.text.StrSubstitutor;

   Map map = new HashMap();
   map.put("DAYS", "2");
   map.put("HOURS", "8");
   String str = "${DAYS} days and ${HOURS} hours to go";
  
   StrSubstitutor sub = new StrSubstitutor(map);
   String resolvedString = sub.replace(str);