Help me with a simple error in my code dealing with ArrayLists: Here\'s my code:

Question

Help me with a simple error in my code dealing with ArrayLists:

Here's my code:

import java.util.ArrayList;

public class Checkout
    {
        private int size;
        private int amount;
        private int sum;
        private double taxRate;
        private ArrayList <DessertItem> dessertItems;
       
        public Checkout()
        {
            size = 100;
            amount = 0;
            sum = 0;
            dessertItems = new ArrayList <DessertItem>();
            taxRate = DessertShoppe.TAX_RATE;
        }
       
        public void enterItem(DessertItem item)
        {
            dessertItems.add (item);
            amount++;
        }
       
        public int numberOfItems()
        {
            return amount;
        }
       
        public int totalCost()
        {
            sum = 0;
            for (int i = 0 ; i < amount ; i++)
                {
                    sum += dessertItems[i].getCost ();
                }
            return sum;
        }
       
        public int totalTax()
        {
            return (int) (Math.round(this.totalCost() * taxRate / 100));
        }
       
        public void clear()
        {
            for (DessertItem item : dessertItems)
                {
                    item = null;
                }
             amount = 0;
             sum = 0;
        }
       
        public String toString()
        {
            String receipt = "Thank You!";
            receipt += DessertShoppe.STORE_NAME + " ";
            receipt += "Purchased: ";
            String totalPay = DessertShoppe.cents2dollarsAndCents(totalCost() + totalTax());
            if (totalPay.length() > DessertShoppe.COST_WIDTH)
                {
                    totalPay = totalPay.substring(0, DessertShoppe.COST_WIDTH);
                }
            receipt += "$" + totalPay;
            return receipt;
         }
       
       
    }

This is the error code I get for the bolded line of code:

The type of the expression must be an array type but it resolved to ArrayList<DessertItem>

Explanation / Answer

Since you have not posted class DessertItem, so i can not know what is returned by : dessertItems[i].getCost ()

But It seems that it is returning FLOAT type. But "sum" is of type "Integer". So, if you change type of "sum" variable then it may work

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