แม่ชม้อยแจกlab java

import java.awt.*;
import java.applet.*;
import java.awt.event.*;
import java.text.DecimalFormat;

public class CommissionApplet extends Applet implements ItemListener
{

//declare var
double dollars, answer;
int empCode;
Image dollarSign;
Color darkRed = new Color(100,150,50);
Label promptLabel = new Label("Enter the sales amount (do not use commas or dollar signs) : ");
TextField salesField = new TextField(20);

Label codeLabel = new Label("Select the appropriate commission code : ");

CheckboxGroup codeGroup = new CheckboxGroup();
Checkbox telephoneBox = new Checkbox("Telephone Sales",false,codeGroup);
Checkbox inStoreBox = new Checkbox("In-Store Sales",false,codeGroup);
Checkbox outsideBox = new Checkbox("Outside Sales",false,codeGroup);
Checkbox hiddenBox = new Checkbox("",true,codeGroup);

Label outputLabel = new Label("Click an option button to calculate the slaes commission.");


public void init()
{
setBackground(darkRed);
setForeground(Color.white);
add(promptLabel);
add(salesField);
salesField.requestFocus();
salesField.setForeground(Color.black);
add(codeLabel);
add(telephoneBox);
telephoneBox.addItemListener(this);
add(inStoreBox);
inStoreBox.addItemListener(this);
add(outsideBox);
outsideBox.addItemListener(this);
add(outputLabel);
}

public void itemStateChanged(ItemEvent choice)
{
try
{
dollars = getSales();
empCode = getCode();
answer = getComm(dollars,empCode);
output(answer,dollars);
บรรทัดนี้ดักควายห้ามก๊อป
}
catch (NumberFormatException e)
{
outputLabel.setText("You must enter a dollar amount greater than zero.");
hiddenBox.setState(true);
salesField.setText("");
salesField.requestFocus();
}
}

public double getSales()
{
double sales = Double.parseDouble(salesField.getText());
if(sales <= 0)throw new NumberFormatException();
return sales;
}

public int getCode()
{
int code = 0;
if(telephoneBox.getState()) code = 1;
else
if(inStoreBox.getState()) code = 2;
else
if(outsideBox.getState())code = 3;
return code;
บรรทัดนี้ดักควายห้ามก๊อป
}

public double getComm(double sales, int code)
{
double commission = 0.0;
switch (code)
{
case 1:
commission = .10 * sales;
break;
case 2:
commission = .14 * sales;
break;
บรรทัดนี้ดักควายห้ามก๊อป
case 3:
commission = .17 * sales;
break;
}
return commission;
}
public void output(double commission,double sales)
{
DecimalFormat twoDigits = new DecimalFormat("$#,###.00");
outputLabel.setText("Your commission on sales of" + twoDigits.format(sales) + "is" + twoDigits.format(commission));
}

public void paint(Graphics g)
{
dollarSign = getImage(getDocumentBase(),"dollarSign.gif");
g.drawImage(dollarSign,12,28,this);
}
}