java - Summing ArrayList values

Question

Ok, so far my program allows user input, recognizes how many numbers are stored in the array list and then outputs those numbers that are stored. How can I sum all the numbers entered by the user?

import java.util.Scanner;
import java.util.ArrayList;

public class lab5 
{
    public static void main (String[]args)
    {
        Scanner userInput = new Scanner(System.in);

        ArrayList<Integer> list = new ArrayList<>();

        //Creates initial value for nextInt variable
        int nextInt = -1; 

        //Create loop to store user input into array list until 0 is entered
        while((nextInt = userInput.nextInt()) != 0)
        {
            list.add(nextInt);
        }

        //Calculate average once zero is inputted
        if (nextInt == 0)
        {
            System.out.println("There are " + list.size() + " numbers in this array list");
            System.out.println("The numbers are " + list);
            System.out.println("The sum of the number are ")
        }
    }
}

Answer 1

你很近！输入到您的程序中的所有数字都将驻留在nextInt某个时刻。你怎么能用这个事实来得到总和？提示：您需要跟踪while循环外的总和。