java - Merging two lists without duplicates -


i trying merge 2 lists while removing duplicate values inside of them. when doing this, adds every station , assumes mapvalue list not contain of stations though (im ending lot of duplicates). doing wrong? 

map<string, list<stations>> overview = new treemap<string, list<stations>>();     for(trains train: trainoverview){         list<stations> mapvalue = overview.get(train.gettrainnumber());         //merge lists if key exists, , replace old value merged list         if(overview.containskey(train.gettrainnumber())){                        for(stations station: train.getstations()){                 if(!mapvalue.contains(station)) mapvalue.add(station);             }             overview.put(train.gettrainnumber(), mapvalue);         }         //if no key exists, create new entry         else{             overview.put(train.gettrainnumber(), train.getstations());         }        }

uniqueness of elements within collection can achieved using set implementation. should use it. first iterate on element of first list , add them set. repeat same procedure second list. it's done.


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