Sample usage of reduce operation in Java Stream API with two parameters

StreamReduceSecondSample.java

   //append all model into single line of string with default model: Renault
   String carModels = cars.stream()
                          .map(c1 -> c1.getModel())
                          .distinct()
                          .reduce("Renault", (s1, s2) -> s1 + "|" + s2);
   System.out.println(carModels);
   //Output: Renault|BMW|Ford|Toyota