Interesting Use Of Optional

Optional.java

            String stringWithNull = null;
            String nullResult = Optional.ofNullable(stringWithNull)
                    .map(Integer::valueOf)
                    .map(i -> i + 1)
                    .map(Object::toString)
                    .orElse("number not present"); //This or else from optional is of most interest
            System.out.println(nullResult);

            String numberInString = "100";
            String result = Optional.ofNullable(numberInString)
                    .map(Integer::valueOf)
                    .map(i -> i + 1)
                    .map(Object::toString)
                    .orElse("number not present"); //This or else from optional is of most interest
            System.out.println(result);