How to read multiple Integer values from a single line of input in Java?

Question

I am working on a program and I want to allow a user to enter multiple integers when prompted. I have tried to use a scanner but I found that it only stores the first intege

Answer 1

There is more than one way to do that but simple one is using String.split(" ") this is a method of String class that separate words by a spacial character(s) like " " (space)

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All we need to do is save this word in an Array of Strings.

Warning : you have to use scan.nextLine(); other ways its not going to work(Do not use scan.next();

String user_input = scan.nextLine();
String[] stringsArray = user_input.split(" ");

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now we need to convert these strings to Integers. create a for loop and convert every single index of stringArray :

for (int i = 0; i < stringsArray.length; i++) {
    int x = Integer.parseInt(stringsArray[i]);
    // Do what you want to do with these int value here
}

Best way is converting the whole stringArray to an intArray :

 int[] intArray = new int[stringsArray.length];
 for (int i = 0; i < stringsArray.length; i++) {
    intArray[i] = Integer.parseInt(stringsArray[i]);
 }

now do any proses you want like print or sum or... on intArray

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The whole code will be like this :

import java.util.Scanner;
public class Main {
    public static void main(String[] args) {

        Scanner scan = new Scanner(System.in);
        String user_input = scan.nextLine();
        String[] stringsArray = user_input.split(" ");

        int[] intArray = new int[stringsArray.length];
        for (int i = 0; i < stringsArray.length; i++) {
            intArray[i] = Integer.parseInt(stringsArray[i]);
        }
    }
}