convert comma separated string to list without intermediate container

Question

I need to convert comma separated string to list of integers. For example if I have following string

String numbersArray = \"1, 2, 3, 5, 7, 9,\";


        

Answer 1

If you're not on java8, then you can use Guava

Lists.transform(Arrays.asList(numbersArray.split(",")), new Function<String, Integer>() {
                    @Override
                    public Integer apply(String input) {
                        return Integer.parseInt(input.trim());
                    }
                });

As @Maroun has mentioned for Java8 you can use Streams.

int[] numbers = Arrays.asList(numbersArray.split(","))
                      .stream()
                      .map(String::trim)
                      .mapToInt(Integer::parseInt).toArray();