Thread: I am totally confused how to modify my Inverntory Program Part 3 to add GUI

This is the basic GUI I have coded so far but not sure how to incorporated into my existing code. Need help deseperately already a day late turning this in.

import java.awt.*;  
 
  import javax.swing.*;  
 
  import java.awt.event.*;  
 
 
 
  public class RectangleProgram extends JFrame  
 
  {  
 
      private static final int WIDTH = 400;  
 
      private static final int HEIGHT = 300;  
 
 
 
      private JLabel lengthL, widthL, areaL;  
 
      private JTextField lengthTF, widthTF, areaTF;  
 
      private JButton calculateB, exitB;  
 
 
 
      //Button handlers:  
 
     private CalculateButtonHandler cbHandler;  
 
     private ExitButtonHandler ebHandler;  
 
 
 
      public RectangleProgram()  
 
      {  
 
          lengthL = new JLabel("Enter the length: ", SwingConstants.RIGHT);  
 
          widthL = new JLabel("Enter the width: ", SwingConstants.RIGHT);  
 
          areaL = new JLabel("Area: ", SwingConstants.RIGHT);  
 
 
 
          lengthTF = new JTextField(10);  
 
          widthTF = new JTextField(10);  
 
          areaTF = new JTextField(10);  
 
 
 
          //SPecify handlers for each button and add (register) ActionListeners to each button.  
 
          calculateB = new JButton("Calculate");  
 
          cbHandler = new CalculateButtonHandler();  
 
          calculateB.addActionListener(cbHandler);  
 
          exitB = new JButton("Exit");  
 
          ebHandler = new ExitButtonHandler();  
 
          exitB.addActionListener(ebHandler);  
 
 
 
          setTitle("Sample Title: Area of a Rectangle");  
 
          Container pane = getContentPane();  
 
          pane.setLayout(new GridLayout(4, 2));  
 
 
 
          //Add things to the pane in the order you want them to appear (left to right, top to bottom)  
 
          pane.add(lengthL);  
 
          pane.add(lengthTF);  
 
          pane.add(widthL);  
 
          pane.add(widthTF);  
 
          pane.add(areaL);  
 
          pane.add(areaTF);  
 
          pane.add(calculateB);  
 
          pane.add(exitB);  
 
 
 
          setSize(WIDTH, HEIGHT);  
 
          setVisible(true);  
 
          setDefaultCloseOperation(EXIT_ON_CLOSE);  
 
      }  
 
 
 
      private class CalculateButtonHandler implements ActionListener  
 
      {  
 
         public void actionPerformed(ActionEvent e)  
 
          {  
 
              double width, length, area;  
 
 
 
              length = Double.parseDouble(lengthTF.getText()); //We use the getText & setText methods to manipulate the data entered into those fields.  
 
              width = Double.parseDouble(widthTF.getText());  
 
              area = length * width;  
 
 
 
              areaTF.setText("" + area);  
 
          }  
 
      }  
 
 
 
     public class ExitButtonHandler implements ActionListener  
 
      {  
 
         public void actionPerformed(ActionEvent e)  
 
         {  
 
              System.exit(0);  
 
      }  
 
   }  
 
 
 
      public static void main(String[] args)  
 
      {  
 
          RectangleProgram rectObj = new RectangleProgram();  
 
      }  
 
 
 
 }

 
//W6 CheckPoint: InventoryPart3.java
//Inventory Program Part 3 Week 6 class Television modified with additional class and restocking fee
 
//import statements
import java.text.NumberFormat;
import java.util.Locale;
import java.util.Arrays;
 
 
  class Television { //class name and attributes
 
    //declare class variables
 	private String itemNumber; //item # of product
 	private String televisionName; //product name
 	public int unitsinStock; //# of units in stock
 	public double unitPrice; //Price per unit
  	NumberFormat nf = NumberFormat.getCurrencyInstance(Locale.US);
 
 	//class constructor
 
 	public Television(String itemNumber, String televisionName, int unitsinStock, double price) {
 		this.itemNumber = itemNumber;
 		this.televisionName = televisionName;
 		this.unitsinStock = unitsinStock;
 		this.unitPrice = price;
 
 } //end constructor
 
  //define set and get methods for class variables
 
 //getter and setter methods for Television
 
 //item number
    public String getItemNumber() { //getter for item number
 		return itemNumber;
 	} //end getter item number
 
  	public void setItemNumber (String itemNumber) { //setter for item number
 		this.itemNumber = itemNumber;
 	} //end setter item number
 
 	//television name
    public String getTelevisionName() { //getter for product name
	 		return televisionName;
 	} //end getter television name
 
 	public void setTelevisionName (String product) { //setter for product name
 		this.televisionName = televisionName;
 	} //end setter television name
 
     //available units
    public double getUnitsInStock() { //getter for units in stock
	  		return unitsinStock;
	} //end getter units in stock
 
 	public void setUnitsInStock (double units) { //setter for units in stock
 		this.unitsinStock = unitsinStock;
 	} //end setter units in stock
 
 	 //price
    public double getUnitPrice() { //getter for unit price
	 		return unitPrice;
 	} //end getter for unit price
 
 	public void setUnitPrice (double price) { //setter for unit price
 		this.unitPrice = unitPrice;
 	} //end setter unit price
 
 
     //calculate the total inventory by returning the product of available units and price
	public double calculateInventory(){
		return unitPrice * unitsinStock;
	}
 
    //toString method that outputs the class variables
	public String toString () {
			return "Television Name:" + "\t" + televisionName + "\n" +
				   "Item Number:" + "\t" + itemNumber + "\n" +
			       "UnitsInStock:" + "\t \t" + unitsinStock + "\n" +
			       "UnitPrice:" + "\t \t" + nf.format(unitPrice) + "\n" +
			       "Item Total:" + "\t" + nf.format(calculateInventory());
			       }
 
}
 
// The is-a test the inheritance relationship between Samsung and Television
 
class Televisions extends Television{
 
	//class variables
	private String serialNumber;
	private double restockFee;
	private static final double RESTOCK_FEE_PERCENTAGE = .05;
 
	//class constructor
	public Televisions(String itemNumber, String televisionName, int unitsinStock, double price, String serialNumber){
		super (itemNumber, televisionName, unitsinStock, price);
		this.serialNumber = serialNumber;
 
		//calculate restock fee as 5% of the inventory total
		restockFee = super.calculateInventory() * RESTOCK_FEE_PERCENTAGE;
	}
 
	//declare get and set methods
	//serial number
	public String getSerialNumber(){
		return serialNumber;
	}
 
	public void setSerialNumber(String serialNumber){
		this.serialNumber = serialNumber;
	}
 
	//restockFee does not have a set method, to ensure that it is only set through the HP constructor
	public double getRestockFee(){
		return restockFee;
	}
 
	//add restock fee and serial number to the output
	public String toString () {
				return super.toString() + "\n" +
				       "Serial Number: " + "\t" + serialNumber + "\n" +
				       "Restock Fee:" + "\t" + nf.format(getRestockFee());
			       }
 
}
 
 
 
 
public class InventoryPart3 {
 
    public static Television[] sortArray(Television[] televisions){
        // First Step
        String[] names = new String[televisions.length];
 
       //Second Step
       Television[] tempProduct = new Television [televisions.length];
 
      //Third Step
 
      for (int i = 0; i < televisions.length; i++){
	  		 names[i] = televisions[i].getTelevisionName();
		}
 
      //Fourth Step
      Arrays.sort(names);
 
     //Fifth Step
    	for (int i = 0; i < televisions.length; i++){ //Product Array
			     for (int j = 0; j < names.length; j++){ //Names Array
			          if (televisions[i].getTelevisionName().equalsIgnoreCase(names[j])) {
			                     tempProduct[j] = televisions[i];
			                     break;
			          }
 
			     }
			}
 
			return tempProduct;
 
	}
 
 	public static double calculateInventoryTotal(Television[] televisions){
		double total = 0;
 
		for (int i = 0; i < televisions.length; i++){
			total += televisions[i].calculateInventory();
		}
 
		return total;
	}
 
 
 
 
    public static void main (String[] args) {
 
        NumberFormat nf = NumberFormat.getCurrencyInstance(Locale.US);
 
       //create several items for the inventory of type Television and LG
       Television[] televisions = new Television[5];
 
       Television samsung = new Television ("003", "Samsung UN46D6400",9,1599.99);
       Television vizio = new Television ("005", "Vizio XVT553SV",6,1299.00);
       Television panasonic = new Television ("002", "Panasonic Viera TC-P50VT25",2,2079.99);
       Television sony = new Television ("004", "Sony Bravia KDL-55EX720",8, 1889.99);
       Television lg = new Television ("001", "LG Infinia 47LX9500",2,2099.00);
 
//add all of the items to the inventory
		televisions[2] = samsung;
		televisions[4] = vizio;
		televisions[1] = panasonic;
		televisions[3] = sony;
		televisions[0] = lg;
 
        //sort items
		televisions = sortArray(televisions);
 
		//calculate inventory total
		double inventoryTotal = calculateInventoryTotal(televisions);
 
		//output inventory
		System.out.println("Inventory Items: " + "\n");
		for (int i = 0; i < televisions.length; i++){
			System.out.println(televisions[i]);
			System.out.println();
		}
 
		//output inventory total
		System.out.println("Inventory Total: " + nf.format(inventoryTotal));
	}
 
}

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