Invemtory program with Java Swing GUI gives me one error I can't debug

All,

The code below gives me this one error I can't seem to figure out:

Inventory5.java:239: cannot resolve symbol
symbol  : method format  (java.lang.String,java.lang.String,int,int,double,java.
lang.String,double,double)
location: class java.lang.String
                return String.format("Product: %s\nItem Number: %d\nIn Stock: %d
\nPrice: $%.2f\nType: %s\nTotal Value of Stock: $%.2f\nRestock Cost: $%.2f\n\n\n
",
                             ^
1 error


Essentially I'm trying to adding a button to the GUI that allows the user to move to the first item, the previous item, the next item, and the last item in the inventory. If the first item is displayed and the and the user clicks on the previous button, the last item should display. If the last item is displayed and the user clicks on the Next button, the first item should display.
Add a company logo to the GUI using Java graphics classes.

import java.awt.BorderLayout;
import java.awt.GridLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
 
import javax.swing.Icon;
import javax.swing.ImageIcon;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.JTextArea;
 
public class Inventory5
{
	static int dispProd = 0; // variable for actionEvents
	
	public static void main(final String args[])
	{
 
		int i; // varialbe for looping
		double total = 0; // variable for total inventory
 
 
		// Instantiate a product object
		final ProductAdd[] nwProduct = new ProductAdd[5];
		// Instantiate objects for the array
		for (i=0; i<5; i++)
		{
			nwProduct[0] = new ProductAdd("Quantum of Solace", 101, 10, 24.00, "CD");
			nwProduct[1] = new ProductAdd("Slumdog Millionaire", 102, 10, 25.75, "DVD");
			nwProduct[2] = new ProductAdd("Iron Man", 103, 10, 25.50, "DVD");
			nwProduct[3] = new ProductAdd("The Dark Knight", 104, 10, 25.00, "Box");
			nwProduct[4] = new ProductAdd("Gran Torino", 105, 10, 23.00, "CD");
			
			 
 
			
		}
 
  
			for (i=0; i<5; i++)
				total += nwProduct.length; // calculate total inventory cost
 
			final JButton firstBtn = new JButton("First"); // first button
			final JButton prevBtn = new JButton("Previous"); // previous button
			final JButton nextBtn = new JButton("Next"); // next button
			final JButton lastBtn = new JButton("Last"); // last button
			final JLabel label; // logo
			final JTextArea textArea; // text area for product list
			final JPanel buttonJPanel; // panel to hold buttons
 
			//JLabel constructor for logo
			Icon logo = new ImageIcon("C:/logo.jpg"); // load logo
			label = new JLabel(logo); // create logo label
			label.setToolTipText("Companies Design"); // create tooltip
 
			buttonJPanel = new JPanel(); // set up panel
			buttonJPanel.setLayout( new GridLayout(1, 4)); //set layout
 
			// add buttons to buttonPanel
			buttonJPanel.add(firstBtn);
			buttonJPanel.add(prevBtn);
			buttonJPanel.add(nextBtn);
			buttonJPanel.add(lastBtn);
 
 
			textArea = new JTextArea(nwProduct[3]+"\n"); // create textArea for product display
 
			// add total inventory value to GUI
			textArea.append("\nTotal value of Inventory "+new java.text.DecimalFormat("$0.00").format(total)+"\n\n");
			textArea.setEditable(false); // make text uneditable in main display
			JFrame invFrame = new JFrame(); // create JFrame container
			invFrame.setLayout(new BorderLayout()); // set layout
			invFrame.getContentPane().add(new JScrollPane(textArea), BorderLayout.CENTER); // add textArea to JFrame
			invFrame.getContentPane().add(buttonJPanel, BorderLayout.SOUTH); // add buttons to JFrame
			invFrame.getContentPane().add(label, BorderLayout.NORTH); // add logo to JFrame
			invFrame.setTitle("Office Min Inventory"); // set JFrame title
			invFrame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); // termination command
			invFrame.setSize(400, 400); // set size of JPanel
			invFrame.setLocationRelativeTo(null); // set screem location
			invFrame.setVisible(true); // display window
 
 
 
			// assign actionListener and actionEvent for each button
			firstBtn.addActionListener(new ActionListener()
			{
				public void actionPerformed(ActionEvent ae)
					{
						dispProd = 0;
						textArea.setText(nwProduct[dispProd]+"\n");
 
					} // end firstBtn actionEvent
 
			}
		   ); // end firstBtn actionListener
 
 
	prevBtn.addActionListener(new ActionListener()
	{
		public void actionPerformed(ActionEvent ae)
		{
			dispProd--;
			if (dispProd < 0)
			{
				dispProd = 0;
			}
			
			textArea.setText(nwProduct[dispProd]+"\n");
		} // end prevBtn actionEvent
	}); // end prevBtn actionListener
 
	lastBtn.addActionListener(new ActionListener()
	{
		public void actionPerformed(ActionEvent ae)
		{
			dispProd = nwProduct.length-1;
			textArea.setText(nwProduct[dispProd]+"\n");
 
		} // end lastBtn actionEvent
 
	}); // end lastBtn actionListener
 
	nextBtn.addActionListener(new ActionListener()
 	{
		public void actionPerformed(ActionEvent ae)
		{
			dispProd++;
			if (dispProd >= nwProduct.length)
			{
				dispProd = nwProduct.length-1;
			}
			textArea.setText(nwProduct[dispProd]+"\n");
		} // end nextBtn actionEvent
	}); // end nextBtn actionListener
 
} // end main
 
} // end class Inventory5
 
class Product
{
	protected String prodName; // name of product
	protected int itmNumber; // item number
	protected int units; // number of units
	protected double price; // price of each unit
	protected double value; // value of total units
 
 
	public Product(String name, int number, int unit, double each) // Constructor for class Product
	{
		prodName = name;
		itmNumber = number;
		units = unit;
		price = each;
 
	} // end constructor
 
	public void setProdName(String name) // method to set product name
	{
		prodName = name;
	}
 
	public String getProdName() // method to get product name
	{
		return prodName;
	}
 
	public void setItmNumber(int number) // method to set item number
	{
		itmNumber = number;
	}
 
	public int getItmNumber() // method to get item number
	{
		return itmNumber;
	}
 
	public void setUnits(int unit) // method to set number of units
	{
		units = unit;
	}
 
	public int getUnits() // method to get number of units
	{
		return units;
	}
 
	public void setPrice(double each) // method to set price
	{
		price = each;
	}
 
	public double getPrice() // method to get price
	{
		return price;
	}
 
	public double calcValue() // method to set value
	{
		return units * price;
	}
 
  
} // end class Product
 
 
class ProductAdd extends Product
{
	private String feature; // variable for added feature
 
	public ProductAdd(String name, int number, int unit, double each, String addFeat)
	{
		// call to superclass Product constructor
		super(name, number, unit, each);
 
		feature = addFeat;
	}// end constructor
 
	public void setFeature(String addFeat) // method to set added feature
	{
		feature = addFeat;
	}
 
	public String getFeature() // method to get added feature
	{
		return feature;
	}
 
	public double calcValueRstk() // method to set value and add restock fee
	{
		return units * price * 0.05;
	}
 
	public String toString()
	{
		return String.format("Product: %s\nItem Number: %d\nIn Stock: %d\nPrice: $%.2f\nType: %s\nTotal Value of Stock: $%.2f\nRestock Cost: $%.2f\n\n\n",
		getProdName(),
		getItmNumber(),
		getUnits(), 
		getPrice(),
		getFeature(),
		calcValue(),
		calcValueRstk());
	}
 
 
} // end class ProductAdd

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