Thread: Cannot find symbol - method getItemNumber()

String line;
for (int i = 0; i < products.size(); i++) {

Supplier product = products.get(i);

line = product.getProductName() + "\t";
line += product.getItemNumber() + "\t";
line += product.getPrice() + "\t";
line += product.getUnitsInStock() + "\t";
line += product.getSupplierName() + "\n";

try {
writer.write(line);
} catch (IOException e) {
JOptionPane.showMessageDialog(null,
"Could not write in the inventory file.");
}
}

--- Update ---

this is the Supplier class

public class Supplier extends Inventary {

/**
* Supplier Name
*/

private String supplierName;

/**
* Default constructor;
*/
public Supplier() {
}

/**
* Constructor should have 5 parameters:
*
* - Item Number
*
* - Product Name
*
* - Number of Units in Stock
*
* - Price of each Unit
*
* - Supplier Name
*/
public Supplier(int itemNumber, String productName, int unitsInStock,
double price, String supplierName) {
/*
* Note you will use the super keyword to invoke the constructor in your
* Product class.
*/
// super(itemNumber, productName, unitsInStock, price);

this.itemNumber = itemNumber;
this.productName = productName;
this.unitsInStock = unitsInStock;
this.price = price;
this.supplierName = supplierName;
}

/**
* return the product name
*/

public String getProductName(){

return productName;


}

/**
* return the unitsInStock
*/

public int getUnitsInStock(){

return unitsInStock;

}

/**
* return the price.
*/

public double getprice(){

return price;

}

/**
* @return the supplierName
*/
public String getSupplierName() {
return supplierName;
}

/**
* need to set the itemNumber.
*/

public void setItemNumber( int itemNumber ) {

this.itemNumber = itemNumber;

}

/**
* product name to set
*/

public void setName ( String productName ) {

this.productName = productName;

}

/**
* price to set
*/

public void setPrice ( double price ) {

this.price = price;

}

/**
* @param supplierName
* the supplierName to set
*/
public void setSupplierName(String supplierName) {
this.supplierName = supplierName;
}


/**
* This method returns the product of price and available units multiplied
* by 5% ((price * product) * .05);
*/
public double calculateRestockFee() {

return calculateInventory() * .05;

}

/**
* This method returns the product of price and available units plus the
* restock fee.
*/
public double calculateInventory() {
return calculateInventory() + calculateRestockFee();
}



}

Your Supplier class does not have the method getItemNumber().