Java String.split not saving to Array

Question

Hi i'm having trouble saving my string.split value to an array my array is empty after i use the following code.

Scanner in = new Scanner(System.in);
        String input = in.nextLine();
        in.close();
        if(input.matches("^[0-6][.][0-6]$"))
        {
            b = false;
            String[] coordinates = input.split(".");
            int c1 = Integer.parseInt(coordinates[0]);
            int c2 = Integer.parseInt(coordinates[1]);
            playingfield.PlayTurn(c1, c2);

it tells me coordinates[0] and [1] are null.

Everything up to that point works and the Regex is correct to As i can just print the String there and it works fine

As an aside, I strongly recommend *not* calling `in.close()`. — Klitos Kyriacou, Jan 17 '18 at 13:02
No, your regular expression isn’t correct either. There too you need to escape the dot with `\\`, or it will match strings with any character between the two digits. — Ole V.V., Jan 17 '18 at 13:14

StephaneM · Accepted Answer · 2018-01-17T13:03:23.600

5

Replace

String[] coordinates = input.split(".");

with

String[] coordinates = input.split("\\.");

Split takes a regular expression as a parameter. . matches anything (meaning the whole String), not the dot character as you expect.

edited Jan 17 '18 at 13:03

answered Jan 17 '18 at 13:01

StephaneM

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This gives me an invalid escape sequence error. – Samuel Jan 17 '18 at 13:03
1

You need 2 backslashes (I've edited, the formatter did not like it the first time). – StephaneM Jan 17 '18 at 13:04
worked perfectly thank you! – Samuel Jan 17 '18 at 13:05

Java String.split not saving to Array

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