To find first two maximum numbers in an array,using single loop without sorting array.

import java.util.*;

class ArrayExample {
    public static void main(String[] args) {
        int secondlargest = 0;
        int largest = 0;
        Scanner input = new Scanner(System.in);
        System.out.println("Enter array values: ");
        int arr[] = new int[5];
        for (int i = 0; i < arr.length; i++) {
            arr[i] = input.nextInt();
            if (largest < arr[i]) {
                secondlargest = largest;
                largest = arr[i];
            }
            if (secondlargest < arr[i] && largest != arr[i])
                secondlargest = arr[i];
        }
        System.out.println("Largest number is: " + largest);
        System.out.println("Second Largest number is: " + secondlargest);
    }
}