While Sentinel

import java.util.Scanner;

public class Cookies
{
 public static void main(String[] args)
 {
 //We need 30 cookies
 //asks for name and how many cookies you will bring in :)

  Scanner scanner = new Scanner(System.in);
  int cookies = 0;
  int numCookies = 0;

  while(numCookies != -1)
  {
   //ask for a name
    System.out.print("Name: ");
    String name = scanner.next();


   //ask for how many cookies
    System.out.print("How many cookies are you bringing? (Enter -1 to exit)");
    numCookies = scanner.nextInt();

    if(numCookies == -1)
    {
     System.out.println("Thank you. You, as a class are bringing in " + cookies + " cookies.");
    }

    else
    {
    //report our cookie total
    cookies = numCookies + cookies;

    System.out.println(name + ", you have agreen to bring in " + numCookies + " cookies, for a total of " + cookies + " cookies.");
    }
  }


 }

}