Is there library method to convert String "1, 2, 3, 4" or "1 2 3 4" to array of integers or List?

Question

Is there any tested library method to convert String "1, 2, 3, 4" or "1 2 3 4" to array of integers or List?

I can write it myself, just library is quick and very readable.

`str.split(", ")` or `str.split(" ")` ? ([Doc](https://docs.oracle.com/javase/8/docs/api/java/lang/String.html#split-java.lang.String-)) — SystemGlitch, Apr 25 '18 at 16:03
split will not cast the elements to int, which the what the op seems to want. — Alex K., Apr 25 '18 at 16:03
Alex so you do str.split(",").forEach(string -> numberlist.add(Integer.parse(string)); — SpacePrez, Apr 25 '18 at 16:24

score 0 · Accepted Answer · answered Apr 25 '18 at 16:04

There is no built-in Java API method for this, but writing a helper method yourself is easy enough:

ArrayList<Integer> result = new ArrayList<Integer>();
for (String token : "1 2, 3 4".split("[ ,]+"))
    result.add(Integer.parseInt(token));
// result now holds { 1, 2, 3, 4 }

In Java 8 you could also take advantage of the new Streams concept and its map() method to shorten the code further.

Is there library method to convert String "1, 2, 3, 4" or "1 2 3 4" to array of integers or List?

1 Answers1