Let's see who can help with this applet

Question

Hello. I am new in Java and confused with this assignment.
I have to write an applet for a store that sells 8 products
whose retails prices are Product 1 - $2.98, Product 2 - $4.50, Product 3 - $9.98, Product 4 - $ 4.49, Product 5 - $ 6.87,
Product 6 � $ 12.37, Product 7 - $ 14.30 and Product 8 - $ 11.40.
The applet: 1) Has an intro message to a store named for you, where you describe what products they have, 2) Reads a series of pairs of numbers: Product Number and Quantity Number.
Use a switch structure to determine the retail prices for each product. Use "TextField" to obtain the product number from the user. Use a �sentinel controlled� loop to determine when the program should stop looping to display the final result (I used number -1 as sentinel). Display the total value of all products sold.
This is the program I wrote:
//java core packages
import java.awt.*;
import java.awt.event.*;
import java.text.NumberFormat;
import java.util.Locale;
// Java extension packages
import javax.swing.*;
public class MYSHOP extends JApplet implements ActionListener {
// GUI componentes
JLabel productNumLabel, quantityNumLabel;
JTextField productNumField, quantityNumField;
// variables
double subtotal = 0;
double total = 0;
public void init()
// display intro message
JOptionPane.showMessageDialog( null, "Welcome toablabla.\nWe
offer you blablabla\nClick OK to start shoping",
"Company information", JOptionPane.PLAIN_MESSAGE );
// obtain content pane and set its layout to FlowLayout
Container container = getContentPane();
container.setLayout( new FlowLayout() );
// create productNumLabel, productNumField and attach them to
// content pane
productNumLabel = new JLabel( "Enter Product Number (-1 to
quit):" );
productNumField = new JTextField( 4 );
productNumField.addActionListener( this );
container.add( productNumLabel );
container.add( productNumField );
// create productNumLabel, productNumField and attach them to
// content pane
quantityNumLabel = new JLabel("Enter Quantity:");
quantityNumField = new JTextField( 4 );
quantityNumField.addActionListener( this );
container.add( quantityNumLabel );
container.add( quantityNumField );
} // end method init
public void actionPerformed( ActionEvent actionEvent )
int index = Integer.parseInt( productNumField.getText() );
int ammount = 0;
while ( index != -1 )
NumberFormat moneyFormat =
NumberFormat.getCurrencyInstance( Locale.US );
if( actionEvent == quantityNumField.getText() )
ammount = Integer.parseInt( quantityNumField.getText() );
switch (index)
case 1:
subtotal += ( 2.98 * ammount );
break;
case 2:
subtotal += ( 4.5 * ammount );
break;
case 3:
subtotal += ( 9.98 * ammount );
break;
case 4:
subtotal += ( 4.49 * ammount );
break;
case 5:
subtotal += ( 6.87 * ammount );
break;
case 6:
subtotal += ( 12.37 * ammount );
break;
case 7:
subtotal += ( 14.30 * ammount );
break;
case 8:
subtotal += ( 11.40 * ammount );
break;
case -1:showStatus( "The Total is: " + subtotal );
System.exit(0);
break;
default:
JOptionPane.showMessageDialog( null,"There is no
such product", "ERROR",
JOptionPane.ERROR_MESSAGE);
} // end switch structure
} // end while structure
productNumField.setText(""); // clear productNum field
quantityNumField.setText(""); // clear quantityNum field
} // end method actionPerformed
} // end class MYSHOP
When I try to compile it, the error I get is "incomparable types: java.awt.event.ActionEvent and java.lang.String", in the line:
if( actionEvent == quantityNumField.getText() )
The error pointer points to "==" in that line
What should I write in that line instead?
Also, if someone realizes that some part of the code is in the wrong place, please tell me.
Thanks in advance.

Answer 1

Instead of
if( actionEvent == quantityNumField.getText() ) I think you want
if( actionEvent.getSource() == quantityNumField )HTH,
Radish21