Adding numbers to an array

Question

I want to make a scanner that scans 10 numbers in a String separated by a space. Such as this:

3 4 5 12 32 32 23 54 65 67. Then I want to parse each numbers into int, and store each number in a int array. Does anyone know how to do this? Thanks.

    String numbers;
    int num[] = new num[10];
    Scanner scan = new Scanner(System.in);

    System.out.println("Type something.");
    numbers = scan.nextLine();

Hmmm. And what if you want to do it by commas and not spaces? or periods? or question marks. I think split is a much better method as it gives you more options. — nmelssx
– nmelssx, Commented Mar 23, 2015 at 19:22
lol. Did you actually tested the codes yourself? All i got from the outputs are: num0 num0 num0 num0 num0 num0 num0 num0 num0 num0 — nmelssx
– nmelssx, Commented Mar 23, 2015 at 19:49
Idea is to give a gist of the fact that scanner has functionality to use delimiter. Have corrected for u again — minion
– minion, Commented Mar 23, 2015 at 19:56

Serge Nassar · Accepted Answer · 2015-03-23 19:02:29Z

1

If the numbers are on the same line you can use the split function to create an array of strings and then cast them to int.

String[] numbersSplit = numbers.split();

for(int i = 0; i < numbersSplit.length; i++) {
    num[i] = Integer.parseInt(numbersSplit[i]);
}

answered Mar 23, 2015 at 19:02

Serge Nassar

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7 Comments

nmelssx Over a year ago

Thanks. It works. But how do you say 1 or more spaces in java?

Serge Nassar Over a year ago

you can always add a regex to the split function refer to this documentation : docs.oracle.com/javase/7/docs/api/java/lang/…

minion Over a year ago

well you don't have to use split. Scanner does not automatically for you

nmelssx Over a year ago

I learn better by examples. Can you give me an example of using a regex to split it by whitespaces, or commas?

Serge Nassar Over a year ago

for white spaces you can use .split("\\s+"); and for comas you can use .split(",");

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minion · Accepted Answer · 2015-03-23 19:53:37Z

1

Scanner by default uses whitespace as delimiter. so you can try the below.Added a system out just to prove the theory.

public static void main(String[] args) {
    int num[] = new int[10];
    Scanner scan = new Scanner(System.in);
    int i = 0;
    while (scan.hasNext("\\d+")) {
        num[i] = scan.nextInt();
        i++;
    }
    for (int j = 0; j < num.length; j++) {
        System.out.println("num" + num[j]);
    }

}

If you have delimiter other than space, use syntax like this.

Scanner scan = new Scanner(System.in).useDelimiter(pattern);

PS: press any character to escape from loop.

edited Mar 23, 2015 at 19:53

answered Mar 23, 2015 at 19:10

minion

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