[FIXED] How to read multiple inputs on same line in Java?

Issue

So I'm trying to read all the input from one line, using scanner, then take the values and find the second largest. I would use an array BUT I am not allowed. You are supposed to enter 10 integers, hit enter and evaluate them.

Something like this:

10 20 30 40 50 60 70 80 90 100 ENTER

Second highest number is: 90

I can't manage to solve it at all. It should be easy but I have no idea.

public class SecondLargest {

public static void main(String[] args) {
    {
        int largest = 0;
        int secondLargest = 0;
        Scanner sc = new Scanner(System.in);
        System.out.print("Enter integers: ");
        int numbers = sc.nextInt();
        largest = numbers;

        while (sc.hasNextInt()) {
            if (numbers > largest) {
                secondLargest = largest;
                largest = numbers;
            } else if (numbers > secondLargest) {
                secondLargest = numbers;
            }
        }
        System.out.println("Second largest number is: " + secondLargest);
        sc.close();

    }
}

Solution

Start with assigning the first scanned integer to largest and secondLargest variables and then process the remaining nine integers in a loop as follows:

num = sc.nextInt();
if (num > largest) {
    secondLargest = largest;
    largest = num;
}

Demo:

import java.util.Scanner;

public class SecondLargest {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        System.out.print("Enter 10 integers separated by single spaces: ");

        // Scan the first integer and assign it to largest and secondLargest
        int num = sc.nextInt();
        int largest = num;
        int secondLargest = largest;

        // Input 9 more integers
        for (int i = 1; i < 10; i++) {
            num = sc.nextInt();
            if (num > largest) {
                secondLargest = largest;
                largest = num;
            }
        }

        System.out.println("The second largest number is: " + secondLargest);
    }
}

A sample run:

Enter 10 integers separated by single spaces: 10 23 4 12 80 45 78 90 105 7
The second largest number is: 90

Note: This is just a sample program assuming that the input is in the correct format. I leave it to you to work on how to deal with the wrong input. It will be a good exercise for you.

Answered By - Arvind Kumar Avinash
Answer Checked By - Candace Johnson (JavaFixing Volunteer)