Event Handling Help needed please.

Question

Hi,
I am writing a program to simulate a supermarket checkout. I have done the GUI and now i am trying to do the event handling. I have come up against a problem.
I have a JCombobox called prodList and i have added an string array to it called prods . I have also created 2 more arrays with numbers in them.
I want to write the code for if an item is selected from the combo box that the name from the array is shown in a textfield tf1, and also the price and stock no which correspond to the seclected item (both initialised in the other arrays) are also added to the textfield tf1.
I have started writng the code but i am really stuck. Could someone please help me with this please. The code i have done so far is as follows(just the event handling code shown)
          public void ItemStateChange(ItemEvent ie){
          if(ie.getItemSelected()== prodList)
               changeOutput();
          public void changeOutput()
               if(ItemSelected ==0)
                    tf1.setText("You have selected" +a +b +c);
     }

Answer 1

Do you say this because i missed the d of ItemStateChanged ?
I have amended that but still i am getting the same errors class or enum expected. 4 of them relating to the itemStateChanged method.
i will post my whole code if it helps
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import java.util.Observer;  //new
import java.util.Observable;//new
import javax.swing.BorderFactory;
import javax.swing.border.Border;
import javax.swing.border.TitledBorder;
public class MySuperMktPro
     public MySuperMktPro()
          CheckoutView Check1 = new CheckoutView(1,0,0);
          CheckoutView Check2 = new CheckoutView(2,300,0);
          CheckoutView Check3 = new CheckoutView(3,600,0);
          CheckoutView Check4 = new CheckoutView(4,0,350);
          CheckoutView Check5 = new CheckoutView(5,600,350);
          OfficeView off111 = new OfficeView();
    public static void main(String[] args) {
         // TODO, add your application code
         System.out.println("Starting My Supermarket Project...");
         MySuperMktPro startup = new MySuperMktPro();
    class CheckoutView implements ItemListener , ActionListener
    private OfficeView off1;
     private JFrame chk1;
     private Container cont1;
     private Dimension screensize,tempDim;
     private JPanel pan1,pan2,pan3,pan4,pan5;
     private JButton buyBut,prodCode;
     private JButton purchase,cashBack,manual,remove,disCo;
     private JButton but1,but2,finaLi1,but4,but5,but6;
     private JTextArea tArea1,tArea2;
     private JTextField tf1,tf2,tf3,list2;
     private JComboBox prodList;
     private JLabel lab1,lab2,lab3,lab4,lab5,lab6,lab7;
     private int checkoutID; //New private int for all methods of this class
     private int passedX,passedY;
     private String prods[];
     private JButton rb1,rb2,rb3,rb4;
     private double price[];
     private int code[];
     public CheckoutView(int passedInteger,int passedX,int passedY)
          checkoutID = passedInteger; //Store the int passed into the method
        this.passedX = passedX;
        this.passedY = passedY;
          drawCheckoutGui();
     public void drawCheckoutGui()
          prods= new String[20];
          prods[0] = "Beans";
          prods[1] = "Eggs";
          prods[2] = "bread";
          prods[3] = "Jam";
          prods[4] = "Butter";
          prods[5] = "Cream";
          prods[6] = "Sugar";
          prods[7] = "Peas";
          prods[8] = "Milk";
          prods[9] = "Bacon";
          prods[10] = "Spaghetti";
          prods[11] = "Corn Flakes";
          prods[12] = "Carrots";
          prods[13] = "Oranges";
          prods[14] = "Bananas";
          prods[15] = "Snickers";
          prods[16] = "Wine";
          prods[17] = "Beer";
          prods[18] = "Lager";
          prods[19] = "Cheese";
          for(i=0; i<prods.length;i++);
          code = new int [20];
          code[0] = 1;
          code[1] = 2;
          code[2] = 3;
          code[3] = 4;
          code[4] = 5;
          code[5] = 6;
          code[6] = 7;
          code[7] = 8;
          code[8] = 9;
          code[9] = 10;
          code[10] = 11;
          code[11] = 12;
          code[12] = 13;
          code[13] = 14;
          code[14] = 15;
          code[15] = 16;
          code[16] = 17;
          code[17] = 18;
          code[18] = 19;
          code[19] = 20;
          for(b=0; b<code.length; b++);
          price = new double [20];
          price[0] = 0.65;
          price[1] = 0.84;
          price[2] = 0.98;
          price[3] = 0.75;
          price[4] = 0.45;
          price[5] = 0.65;
          price[6] = 1.78;
          price[7] = 1.14;
          price[8] = 0.98;
          price[9] = 0.99;
          price[10] = 0.98;
          price[11] = 0.65;
          price[12] = 1.69;
          price[13] = 2.99;
          price[14] = 0.99;
          price[15] = 2.68;
          price[16] = 0.89;
          price[17] = 5.99;
          price[18] = 1.54;
          price[19] = 2.99;
          for(c=0; c<code.length; c++);
          screensize = Toolkit.getDefaultToolkit().getScreenSize();
          chk1 = new JFrame();
          chk1.setTitle("Checkout #" + checkoutID); //Use the new stored int
          chk1.setSize(300,350);
          chk1.setLocation(passedX,passedY);
          chk1.setLayout(new GridLayout(5,1));
          //chk1.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
          cont1 = chk1.getContentPane();
          //chk1.setLayout(new BorderLayout());
             pan1 = new JPanel();
             pan2 = new JPanel();
          pan3 = new JPanel();
          pan4 = new JPanel();
          pan5 = new JPanel();
          //panel 1
          pan1.setLayout(new FlowLayout());
          pan1.setBackground(Color.black);          
          prodList = new JComboBox(prods);
          prodList.setMaximumRowCount(2);
          prodList.addItemListener(this);
          but1 = new JButton("Buy");
          but1.addActionListener(this);
          lab1 = new JLabel("Products");
          lab1.setForeground(Color.white);
          lab1.setBorder(BorderFactory.createLineBorder(Color.white));
          pan1.add(lab1);
          pan1.add(prodList);          
          pan1.add(but1);
          //panel 2
          pan2 = new JPanel();
          pan2.setLayout(new BorderLayout());
          pan2.setBackground(Color.black);
          lab3 = new JLabel("                                Enter Product Code");
          lab3.setForeground(Color.white);
          tArea2 = new JTextArea(8,10);
          tArea2.setBorder(BorderFactory.createLineBorder(Color.white));
          lab5 = new JLabel("  Tesco's   ");
          lab5.setForeground(Color.white);
          lab5.setBorder(BorderFactory.createLineBorder(Color.white));
          lab6 = new JLabel("Checkout");
          lab6.setForeground(Color.white);
          lab6.setBorder(BorderFactory.createLineBorder(Color.white));
          lab7 = new JLabel("You  selected                      ");
          lab7.setForeground(Color.cyan);
          //lab7.setBorder(BorderFactory.createLineBorder(Color.white));
          pan2.add(lab7,"North");
          pan2.add(lab6,"East");
          pan2.add(tArea2,"Center");
          pan2.add(lab5,"West");
          pan2.add(lab3,"South");
          //panel 3
          pan3 = new JPanel();
          pan3.setLayout(new FlowLayout());
          pan3.setBackground(Color.black);
          manual = new JButton("Manual");
          manual.addActionListener(this);
          manual.setBorder(BorderFactory.createLineBorder(Color.white));
          remove = new JButton("Remove");
          remove.addActionListener(this);
          remove.setBorder(BorderFactory.createLineBorder(Color.white));
          tf1 = new JTextField(5);
          pan3.add(manual);
          pan3.add(tf1);
          pan3.add(remove);
          //panel 4
          pan4 = new JPanel();
          pan4.setLayout(new FlowLayout());
          pan4.setBackground(Color.black);
          finaLi1 = new JButton("Finalise");
     //     finaLi1.addActionListener(this);
          cashBack = new JButton("Cashback");
          JTextField list2 = new JTextField(5);
          but4 = new JButton(" Sum Total");
          but4.addActionListener(this);
          but4.setBorder(BorderFactory.createLineBorder(Color.white));
          cashBack.setBorder(BorderFactory.createLineBorder(Color.white));
          pan4.add(cashBack);
          pan4.add(list2);
          pan4.add(but4);
          //panel 5
          pan5 = new JPanel();
          pan5.setLayout(new GridLayout(2,3));
          pan5.setBackground(Color.black);
          disCo = new JButton("Discount");
          disCo.addActionListener(this);
          disCo.setBorder(BorderFactory.createLineBorder(Color.black));
          but6 = new JButton("Finalise");
          but6.addActionListener(this);
          but6.setBorder(BorderFactory.createLineBorder(Color.black));
          rb1 = new JButton("Cash");
          rb1.addActionListener(this);
          rb1.setBorder(BorderFactory.createLineBorder(Color.black));
          rb2 = new JButton("Card");
          rb2.addActionListener(this);
          rb2.setBorder(BorderFactory.createLineBorder(Color.black));
          rb3 = new JButton("Cheque");
          rb3.addActionListener(this);
          rb3.setBorder(BorderFactory.createLineBorder(Color.black));
          rb4 = new JButton("Voucher");
          rb4.addActionListener(this);
          rb4.setBorder(BorderFactory.createLineBorder(Color.black));
          pan5.add(disCo);
          pan5.add(but6);
          pan5.add(rb1);
          pan5.add(rb2);
          pan5.add(rb3);
          pan5.add(rb4);
          //add the panels to the container        
          cont1.add(pan1);
          cont1.add(pan4);     
          cont1.add(pan2);
          cont1.add(pan3);          
          cont1.add(pan5);          
          chk1.setContentPane(cont1);
          chk1.setVisible(true);     
class OfficeView
     private OfficeView off111;
     private JFrame offMod1;
     private JPanel pane1;
     private JButton refill;
     private Container cont11;
     private Dimension screensize;
     private JTextField tf11,tf12;
     public OfficeView()
          drawOfficeGUI();
     public void drawOfficeGUI()
          screensize = Toolkit.getDefaultToolkit().getScreenSize();
          offMod1 = new JFrame("Office Control");
          int frameWidth = 300;
          int frameHeight = 250;
          offMod1.setSize(frameWidth,frameHeight);
          offMod1.setLocation(300,350);
          offMod1.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
          cont11 = offMod1.getContentPane();
          pane1 = new JPanel();
          pane1.setBackground(Color.cyan);
          refill = new JButton("Refill");
          tf11 = new JTextField(25);
          tf12 = new JTextField(25);
          pane1.add(tf11);
          pane1.add(refill);
          pane1.add(tf12);
          cont11.add(pane1);
          offMod1.setContentPane(cont11);
          offMod1.setVisible(true);
          public void ItemStateChanged(ItemEvent ie)
                    if(ie.getItemSelected()== prodList)
                              changeOutput();
          public void changeOutput()
                    if(ItemSelected ==0)
                              tf1.setText("You have selected", +a +b +c);
               }Message was edited by:
fowlergod09