Thread: Problem accessing specific data in an array and getting it to return properly

Hi guys. Java is really kicking my ass. I am taking this course online with no previous language experience and unfortunately I know no one that is proficient with Java. So here I am . Any assistance would be GREATLY appreciated. I am sorry if I posted this in the wrong forum. I am a newb.

Please let me give you the backdrop of my code.

Implement the findProduct method. This should look through the collection for a product whoose ID field matches the ID argument of this method. Id a matching product is found it should be returned as the method's result. If no matching product is found, return null.

When looking for a match, you will need to call the getID method on a product. This means that you will need to cast when you retrieve an item from the list.

I tried my best at trying to get it to work properly to return the requested product. However the best I could do is not enough. It keeps returning the null even if I put in a correct ID number and it returns a product even if I put in an incorrect ID number.

import java.util.ArrayList;
import java.util.Iterator;
 
/**
 * Manage the stock in a business.
 * The stock is described by zero or more Products.
 * 
 * @author Matthew Wagner 
 * @version 02 Feb 2010
 */
public class StockManager
{
    // A list of the products.
    private ArrayList stock;
 
    /**
     * Initialise the stock manager.
     */
    public StockManager()
    {
        stock = new ArrayList();
    }
 
    /**
     * Add a product to the list.
     * @param item The item to be added.
     */
    public void addProduct(Product item)
    {
        stock.add(item);
    }
 
    /**
     * Receive a delivery of a particular product.
     * Increase the quantity of the product by the given amount.
     * @param id The ID of the product.
     * @param amount The amount to increase the quantity by.
     */
    public void delivery(int id, int amount)
    {
    }
 
    /**
     * Try to find a product in the stock with the given id.
     * @return The identified product, or null if there is none
     *         with a matching ID.
     */
    public Product findProduct(int id)
    {
        int found = 0;
        Iterator it = stock.iterator();         
        while(it.hasNext())
        {
            Product item = (Product) it.next();
            System.out.println(""+item);
            found++;
        }
        if(found > 0)
        {
            return null;
        }
        else
        {
            return ((Product) it.next());
        }
    }
 
    /**
     * Locate a product with the given ID, and return how
     * many of this item are in stock. If the ID does not
     * match any product, return zero.
     * @param id The ID of the product.
     * @return The quantity of the given product in stock.
     */
    public int numberInStock(int id)
    {
        return 0;
    }
 
    /**
     * Print details of all the products.
     */
    public void printProductDetails()
    {
        Iterator it = stock.iterator();
        while(it.hasNext()) 
        {
        System.out.println(it.next());
        }
    }
}