InputMismatch error trying to take integer as user input-CodePudding

I am trying to take an integer as user input and store it in a list until the user hits 'q'. At the moment the user inputs 'q', the loop gets terminated.

The code is showing an InputMismatch error:

import java.util.*;

public class SampleArrayList {
    
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        String s;
        int n;
        
        List<Integer> array = new ArrayList();
        
        while (true) {
            n = sc.nextInt();
            s = sc.nextLine();
            if (s.equals("q")) {
                break;
            } else {
                array.add(n);
            }
        }
        Collections.sort(array);
        System.out.println(array);
    }
}

CodePudding user response：

Are you trying to implement it like the example below?

import java.util.ArrayList;
import java.util.Collections;
import java.util.List;
import java.util.Scanner;

public class Main {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        String s;

        List<Integer> array = new ArrayList();
        while (true) {
            s = sc.nextLine();
            if (s.equalsIgnoreCase("q")) {
                break;
            }
            int num = Integer.parseInt(s);
            array.add(num);
        }

        Collections.sort(array);
        System.out.println(array);
    }
}

CodePudding user response：

Looks like q is trying to be stored as an int, so this should work:

All numbers stored as a String can be parsed as an int with the parseInt() method.

s = sc.nextLine();

if (!s.equals("q"))
{

    array.add(Integer.parseInt(s));
}
else
{
    break;
}