Error in CandleLine Java code Please Help?

Hi everyone could someone please help me in solving this one error that i have in this code. This is an Applet that calculates the shipping costs of items purchased by customers:

import java.applet.*;

import java.awt.*;

import java.awt.event.ItemListener;

import java.text.DecimalFormat;

public class CandleLine extends Applet implements ItemListener

{

//Declare Variables

double dollars, answer;

int shippingCode;

//Construct Components for applet

Label welcome = new Label("Welcome to CandleLine online");

Label OrderEntryLabel = new Label("Please Enter the total amount of you order");

TextField OrderEntryField = new TextField(7);

Label codeLabel = new Label("Select the appropriate shipping method");

CheckboxGroup codeGroup = new CheckboxGroup();

Checkbox PriorityBox = new Checkbox("Priority Delivery; overnight",false,codeGroup);

Checkbox ExpressBox = new Checkbox("Express Delivery; 2 business days",false,codeGroup);

Checkbox StandardBox = new Checkbox("Standard Delivery; 3-7 business days",false,codeGroup);

Checkbox hiddenBox = new Checkbox("",true,codeGroup);

Label Guarantee = new Label("We will guarantee on-time delivery, or your money back ");

Label outputLabel = new Label("");

public void init()

{

setForeground(Color.black);

setBackground(Color.cyan);

add(welcome);

add(OrderEntryField);

add(OrderEntryLabel);

add(PriorityBox);

PriorityBox.addItemListener(this);

add(ExpressBox);

ExpressBox.addItemListener(this);

add(StandardBox);

StandardBox.addItemListener(this);

add(outputLabel);

add(Guarantee);

}

public void ItemStateChanged(ItemListener choice)

{

try

{

dollars = getSales();

shippingCode = getCode();

answer = getShipping(dollars,shippingCode);

output(answer, dollars);

}

catch(NumberFormatException e)

{

outputLabel.setText("You must enter a dollar amount greater than zero");

hiddenBox.setState(true);

OrderEntryField.setText("");

OrderEntryField.requestFocus();

}

}

public double getSales()

{

double total = Double.parseDouble(OrderEntryField.getText());

if(total <= 0) throw new NumberFormatException();

return total;

}

public int getCode()

{

int code = 0;

if (PriorityBox.getState()) code = 1;

else

if (ExpressBox.getState()) code = 2;

else

if (StandardBox.getState()) code = 3;

return code;

}

public double getShipping(double Total, int code)

{

double shipping = 0.0;

switch(code)

{

case 1:

shipping = 16.95;

break;

case 2:

shipping = 13.95;

break;

case 3:

if(Total>100) shipping = 0.0;

else if(Total<=100) shipping = 7.95;

break;

}

return shipping;

}

public void output(double shipping, double total)

{

DecimalFormat twoDigits = new DecimalFormat("$#,0000.00");

outputLabel.setText("Your shipping on sales of " + twoDigits.format(total) + " is "+twoDigits.format(shipping));

}

}

Error: C:\Course Technology\59850d\Chapter 04\CandleLine.java:17: CandleLine is not abstract and does not override abstract method itemStateChanged(java.awt.event.ItemEvent) in java.awt.event.ItemListener

public class CandleLine extends Applet implements ItemListener

^

1 error

Thank You :-)