Arraylist

package others.com;

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


public class ArrayList1 {

    public static List<Integer> insertVal(List<Integer> arrlist, int[] add) {
        for(Integer newAdd: add) {
            arrlist.add(newAdd);
        }
            //.addAll(arrlist, add);
        //}
        return arrlist;
    }

    public static int product(List<Integer> arrlist) {
        int prod = 1;
        for (int i=0; i < arrlist.size() ; i++ ) {
            prod = prod * arrlist.get(i);
        }

        return prod;
    }

    public static void main(String[] args) {
        List<Integer> arrlist = new ArrayList<Integer>();
        int[] addval = { 5, 7, 25 };
        Scanner in = new Scanner(System.in);

        try {
            System.out.println("Enter 5 number:");
            for (int i = 0; i < 5; i++) {
                arrlist.add(in.nextInt());
            }
            int res = product(arrlist);
            System.out.println("\nThe total size of the ArrayList is: " + arrlist.size());
            arrlist = insertVal(arrlist, addval);

            System.out.print(arrlist);
            System.out.println("\nThe total size of the current ArrayList is: " + arrlist.size());

            System.out.print("The product of numbers in ArrayList is: "+res+"\n");
            arrlist.add(res);
            System.out.println(arrlist);

        } catch (Exception e) {
            // TODO: handle exception
        }
    }
}