public ArrayList<Coche> searchCoches(String mat){
        ArrayList<Coche> cList = new ArrayList();
        ArrayList<Coche> res = new ArrayList();
        cList.addAll(cjtCoches.values());
        for(int i=0; i<cList.size(); ++i){
            if(cList.get(i).getMatricula().contains(mat))
                res.add(cList.get(i));
        }
        return res;
    }