Ammending JTextAreas by clicking JButtons - again if CEHJ is watching ;o)

I have 6 JButtons - btnTblPay[6].  When they are clicked I want the bill from the JTextAreas - btnTblPay[6] to total and display in the Jlabel - lblTillReceiptTotal (it should keep running total as more orders are cleared).  When these buttons (btnTblPay) are pressed, I also want the JTextAreas (btnTblPay) to clear contents and the JButtons - btnTables to revert back to White (unnoccupied).  I have written a method called  clearTblOrder for this purpose but do not know quite how to utilise it.

My code is listed below.

Any help greatly appreciated....

import java.awt.*;
import javax.swing.*;
import java.awt.event.*;
import java.util.*;

public class CourseWorkTest extends JApplet implements ActionListener{
   
   
   // declare panels
   JPanel pnlMain = new JPanel();
   JPanel pnlOrder = new JPanel();
   JPanel pnlOrderTop = new JPanel();
   JPanel pnlOrderBott = new JPanel();
   JPanel pnlOrderBottLeft = new JPanel();
   JPanel pnlOrderBottRight = new JPanel();
   JPanel pnlTables = new JPanel();
   JPanel pnlBill = new JPanel();
   JPanel pnlBillTop = new JPanel();
   JPanel pnlBillBott = new JPanel();
   JPanel pnlManager = new JPanel();
   JPanel pnlManagerTop = new JPanel();
   JPanel pnlManagerBott = new JPanel();
         
   //pnlOrder objects
   JLabel lblStarter = new JLabel("Starter",JLabel.CENTER);
   JLabel lblMainCourse = new JLabel("Main Course",JLabel.CENTER);
   JLabel lblDessert = new JLabel("Dessert",JLabel.CENTER);
   JLabel lblDrinks = new JLabel("Drinks",JLabel.CENTER);
   JComboBox myStarter = new JComboBox();
   JComboBox myMainCourse = new JComboBox();
   JComboBox myDessert = new JComboBox();
   JComboBox myDrinks = new JComboBox();
   JButton btnReset = new JButton("Clear Order");
   JButton btnRemoveItem = new JButton("Remove Item");
   JTextArea myOrderBox = new JTextArea(15,15);
   JScrollPane myScrollPane = new JScrollPane(myOrderBox);
   Basket myBasket = new Basket();
   boolean remv = false;
   //String order = new String();
   String descStarters[]= new String[6];
   String descMainCourses[]= new String[6];
   String descDesserts[]= new String[6];
   String descDrinks[]= new String[6];
   float myStarterCosts[]= new float[6];
   float myMainCourseCosts[]= new float[6];
   float myDessertCosts[]= new float[6];
   float myDrinksCosts[]= new float[6];

   // pnlTables objects
   JButton btnTables[] = new JButton[6];
           
   //pnlBill objects
   JLabel lblBillTitle = new JLabel("Tables Currently Occupied And Their Bills",JLabel.CENTER);
   JTextArea tblOrders[] = new JTextArea[6];
   
   //pnlManager objects
   JButton btnTblPay[] = new JButton[6];
   JLabel lblTillReceipt = new JLabel("This Evening's Till Receipts: ",JLabel.CENTER);
   JLabel lblTillReceiptTotal = new JLabel("       £0.00",JLabel.CENTER);

   public void init(){

      //Add objects to main panel - pnlMain
      pnlMain.setLayout(new GridLayout(2,2));
      pnlMain.setBackground(Color.WHITE);
      pnlMain.add(pnlOrder);
      pnlMain.add(pnlTables);
      pnlMain.add(pnlBill);
      pnlMain.add(pnlManager);

      //Add Objects to pnlOrder
      pnlOrder.setLayout(new BorderLayout());
      pnlOrder.add(pnlOrderTop, BorderLayout.NORTH);
      pnlOrder.add(pnlOrderBott, BorderLayout.CENTER);
     
      //Add objects to pnlOrderTop
      pnlOrderTop.setLayout(new GridLayout(2,4));
      pnlOrderTop.add(lblStarter);
      pnlOrderTop.add(lblMainCourse);
      pnlOrderTop.add(lblDessert);
      pnlOrderTop.add(lblDrinks);
      pnlOrderTop.add(myStarter);
      pnlOrderTop.add(myMainCourse);
      pnlOrderTop.add(myDessert);
      pnlOrderTop.add(myDrinks);

      //Starters array
      descStarters[0]= "Haddock Chowder";
         descStarters[1]= "French Onion Soup";
         descStarters[2]= "Eggs Florentine";
         descStarters[3]= "Ardennes Pate";
         descStarters[4]= "Quail Salad";
         descStarters[5]= "Thai Tiger Prawns";
      for (int i=0;i<6;i++){
         myStarter.addItem(descStarters[i]);
      }
        
      //Main course array
            descMainCourses[0]= "Breast of Chicken";
         descMainCourses[1]= "Shredded Chilli Beef";
         descMainCourses[2]= "Roast Duck";
         descMainCourses[3]= "Tofu Delight";
         descMainCourses[4]= "Bi Bim Bap";
         descMainCourses[5]= "Spaghetti Bolognaise";
      for (int i=0;i<6;i++){
         myMainCourse.addItem(descMainCourses[i]);
      }
     
      //Dessert array
            descDesserts[0]= "Ice Cream";
         descDesserts[1]= "Fruit Cocktail";
         descDesserts[2]= "Chocolate Gateaux";
         descDesserts[3]= "Lemon Cheesecake";
         descDesserts[4]= "Cheese and Biscuits";
         descDesserts[5]= "Baclava";
      for (int i=0;i<6;i++){
         myDessert.addItem(descDesserts[i]);
      }

      //Drinks array
            descDrinks[0]= "Asahi";
         descDrinks[1]= "Becks";
         descDrinks[2]= "Gin & Tonic";
         descDrinks[3]= "Orange Juice";
         descDrinks[4]= "Remi Martin";
         descDrinks[5]= "Rum & Pineapple";
      for (int i=0;i<6;i++){
         myDrinks.addItem(descDrinks[i]);
      }

      //add objects to pnlOrderBott
      pnlOrderBott.setLayout(new GridLayout(0,2));
      pnlOrderBott.add(pnlOrderBottLeft);
      pnlOrderBott.add(pnlOrderBottRight);
      myOrderBox = new JTextArea(15,15);
      myOrderBox.setLineWrap(true);
      myScrollPane = new JScrollPane(myOrderBox);
      pnlOrderBottRight.add(myScrollPane);
      pnlOrderBottLeft.add(btnReset);
      pnlOrderBottLeft.add(btnRemoveItem);

      //Add objects to pnlTables
      pnlTables.setLayout(new GridLayout(3,2,20,20));
      pnlTables.setBackground(Color.WHITE);
      for (int i=0;i<6;i++){
         btnTables[i]=new JButton("Table "+ (i+1));
         pnlTables.add(btnTables[i]);
         btnTables[i].setBackground(Color.WHITE);
         btnTables[i].setActionCommand("" + i);
         btnTables[i].addActionListener(this);
      }
     
      //Add panels to Bill panel
      pnlBill.setLayout(new BorderLayout());
      pnlBill.add(pnlBillTop, BorderLayout.NORTH);
      pnlBill.add(pnlBillBott, BorderLayout.CENTER);

      //Add label to BillTop
      pnlBillTop.add(lblBillTitle);

      //Add table order/bill text areas to BillBott panel
      pnlBillBott.setLayout(new GridLayout(2,3,2,2));
      for (int i=0;i<6;i++){
         tblOrders[i]=new JTextArea(5,10);
         pnlBillBott.add(tblOrders[i]);
      }

      //Manager Panel
      pnlManager.setLayout(new GridLayout(2,1));
      pnlManager.add(pnlManagerTop);
      pnlManager.add(pnlManagerBott);

      //Manager Top panel
      pnlManagerTop.setLayout(new GridLayout(2,3,5,5));
      for (int k=0;k<6;k++){
         btnTblPay[k]=new JButton("Clear Table "+ (k+1));
         pnlManagerTop.add(btnTblPay[k]);
         btnTblPay[k].setBackground(Color.WHITE);
         btnTblPay[k].setActionCommand("" + k);
         btnTblPay[k].addActionListener(this);
      }

      //Manager Bottom Panel
      pnlManagerBott.setLayout(new GridLayout(2,1,5,5));
      pnlManagerBott.add(lblTillReceipt);
      pnlManagerBott.add(lblTillReceiptTotal);

      //Starter Costs array
      myStarterCosts[0]= 5.00F;
      myStarterCosts[1]= 4.50F;
      myStarterCosts[2]= 6.00F;
      myStarterCosts[3]= 6.00F;
      myStarterCosts[4]= 6.50F;
      myStarterCosts[5]= 7.00F;

      //Main Course Costs array
      myMainCourseCosts[0]= 9.00F;
      myMainCourseCosts[1]= 9.50F;
      myMainCourseCosts[2]= 10.00F;
      myMainCourseCosts[3]= 6.50F;
      myMainCourseCosts[4]= 8.50F;
      myMainCourseCosts[5]= 8.00F;

      //Dessert Costs array
      myDessertCosts[0]= 3.50F;
      myDessertCosts[1]= 4.50F;
      myDessertCosts[2]= 5.00F;
      myDessertCosts[3]= 5.00F;
      myDessertCosts[4]= 4.50F;
      myDessertCosts[5]= 4.00F;

      //Drinks Costs array
      myDrinksCosts[0]= 2.50F;
      myDrinksCosts[1]= 2.50F;
      myDrinksCosts[2]= 3.00F;
      myDrinksCosts[3]= 2.00F;
      myDrinksCosts[4]= 5.00F;
      myDrinksCosts[5]= 3.00F;
         
      // puts the JPanel on the JApplet
      setContentPane(pnlMain);

      //add actionListener
      btnReset.addActionListener(this);
      btnRemoveItem.addActionListener(this);
      myStarter.addActionListener(this);
      myMainCourse.addActionListener(this);
      myDessert.addActionListener(this);
      myDrinks.addActionListener(this);


   }//end init

   
   public void actionPerformed(ActionEvent e){     // ((JButton) e.getSource()).setVisible(false);
     
      //Gather order to myOrderBox and calculate total
      if (e.getSource()==myStarter){
         //set color to black if Clear order button has been pressed
         myOrderBox.setForeground(Color.BLACK);
         int j = myStarter.getSelectedIndex();
         OrderLine line = new OrderLine(j,descStarters[j],myStarterCosts[j]);
         if (remv){
            myBasket.removeOrderLine(line);
            remv=false;
         }else{
            myBasket.addOrderLine(line);
         }
         myOrderBox.setText(myBasket.showContents());
         
      }
      if (e.getSource()==myMainCourse){
         int j = myMainCourse.getSelectedIndex();
         OrderLine line = new OrderLine(j,descMainCourses[j],myMainCourseCosts[j]);
         if (remv){
            myBasket.removeOrderLine(line);
            remv=false;
         }else{
            myBasket.addOrderLine(line);
         }
         myOrderBox.setText(myBasket.showContents());
         
      }
      if (e.getSource()==myDessert){
         int j = myDessert.getSelectedIndex();
         OrderLine line = new OrderLine(j,descDesserts[j],myDessertCosts[j]);
         if (remv){
            myBasket.removeOrderLine(line);
            remv=false;
         }else{
            myBasket.addOrderLine(line);
         }
         myOrderBox.setText(myBasket.showContents());
      }
      if (e.getSource()==myDrinks){
         int j = myDrinks.getSelectedIndex();
         OrderLine line = new OrderLine(j,descDrinks[j],myDrinksCosts[j]);
         if (remv){
            myBasket.removeOrderLine(line);
            remv=false;
         }else{
            myBasket.addOrderLine(line);
         }
         myOrderBox.setText(myBasket.showContents());
      }

      // Clear the order box if Reset button is pressed
      if (e.getSource()==btnReset){
         myBasket.clearIt();
         myOrderBox.setForeground(Color.RED);
         myOrderBox.setText("The order is empty");
      }
     
      // Assign order to Bill Panel for Kitchen staff and
      Object o = e.getSource();
      if (o instanceof JButton){
         String sIndex = ((JButton)o).getActionCommand();
         int index = Integer.parseInt(sIndex);
         updateTblOrder(index);
      }
     
           
   }// end actionPerformed

   // method to update table orders in text areas of Bill panel and show table as occupied (turn button orange)
   public void updateTblOrder(int index){
     
      tblOrders[index].setText(myBasket.showContents());
      btnTables[index].setBackground(Color.ORANGE);
   
   }//end updateTblOrder method

   //method to clear table order from tblOrder Text Areas and show table as unoccupied (turn button back to white)
   public void clearTblOrder(int index){

      tblOrders[index].setText("Table Empty");
      btnTables[index].setBackground(Color.WHITE);
   
   }//end clearTblOrder method

}//end class def


class OrderLine{
   public int id;
   public String description;
   public int quantity;
   public double price;

   public OrderLine(int i,String des,double p){
      this.id = i;
      this.description = des;
      this .price =p;
      this.quantity = 1;
   }
}// end of OrderLine class def

class Basket{
   ArrayList Order= new ArrayList();

   public void clearIt(){
      Order.clear();
   }// end of clearIt method
   
   public void addOrderLine(OrderLine line){
      boolean there = false;
      for(int j =0;j<Order.size();j++){
         OrderLine read = (OrderLine)Order.get(j);

         //the code below which updates quantity of orderlines has been commented out because very
         //often waiters take orders in a certain pattern in order to know where the dishes are  
         //going.  If the quantity is added to, the waiter will have no idea as to which customer
         //ordered which dish

         //if(read.id == line.id){
         //   there = true;
         //   read.quantity++;//if it's there already update its quantity
         //}
      }//end loop
      if(!there){Order.add(line);}// add another instance
   }//end addOrderLine method

   public void removeOrderLine(OrderLine line){
      for(int j =0;j<Order.size();j++){
         OrderLine read = (OrderLine)Order.get(j);
         if(read.id == line.id)read.quantity--;
         if(read.quantity<1){Order.remove(read);}
      }//end loop
   }//end removeOrderLine

   public String showContents(){
      String contents = new String();
      double bill = 0;
     
      for(int j =0;j<Order.size();j++){
         OrderLine read = (OrderLine)Order.get(j);
         contents+=read.quantity+" "+read.description;
         contents+="\n";
         bill+=read.price*read.quantity;
      }
      if(bill>0){
         contents+="\nTotal cost = £"+bill;
         return contents;
      }else{
         return "No order"  ;
      }
   }//end showContents

}//end Basket class def