Really confused, Need assistance!

import javax.swing.JOptionPane;

public class Exam2MAY
{
    public static void main(String[] args)

    {
        String productName;
        String modelNum;
        String productPrice;
        String productQuantity;
        String differentProducts;

        int loopCount = 0;
        int grossRevenueAll;

        differentProducts = JOptionPane.showInputDialog(null,"How many products will you enter? (Keep under 5)");

        do
        {
        productName = JOptionPane.showInputDialog(null,"Enter the name of the product.");
        modelNum = JOptionPane.showInputDialog(null,"What is the model number?");
        productPrice = JOptionPane.showInputDialog(null,"What is the price of the product? $");
        productQuantity = JOptionPane.showInputDialog(null,"What is the quantity of sold product this week");

        int otherProducts = Integer.parseInt(differentProducts);
        double price = Double.parseDouble(productPrice);
        double quantity = Double.parseDouble(productQuantity);
        double grossPrice = price * quantity;
        loopCount = otherProducts;


        System.out.println("Product name :" + productName);
        System.out.println("Model number :" + modelNum);
        System.out.println("Product price :" + productName);
        System.out.println("Product quantity :" + productQuantity);
        System.out.println("Gross revenue : $" + grossPrice);
        ++ loop;
        grossRevenueAll(loop) = price;
        }
        while(loopCount < 5);
        System.exit(0);
        int currentProduct = loopCount;
    }
}