Java Reference
In-Depth Information
private
ImageIcon iconProduct1
#
new
ImageIcon("Product1.jpg");
private
GridBagLayout gridBagLayout1
#
new
GridBagLayout();
//...
private
BarCodeListener listener;
public void
setListener(BarCodeListener newListener){
listener
#
newListener;
}
void
readCode_actionPerformed(ActionEvent e) {
if
(listener!
#
null){
String cmd
#
e.getActionCommand();
listener.readValue(
new
BarCodeReaderEvent(cmd));
}
}
}
14.4.4
Test
The test on the user interface consists of a set of operations that correspond
to user touches on the terminal screen. The sequence of operations and
expected effects on the user interface are:
Run the terminal program:
■
-
The terminal starts with the initial screen (Figure 14.6, top).
Select the “code” field and type “1” on the keypad.
■
Select the “password” field and type “111” on the keypad.
■
Click on the “Connect” button:
■
-
the terminal switches to the Acquisition screen (Figure 14.6, bottom);
-
the bar code reader emulation window appears.
Simulate the reading of the code of a customer by clicking on one of the
customer bar codes:
■
-
the terminal window shows the name of the customer.
Simulate the reading of a product code:
■
-
the terminal window shows the name and the price of the product.
Simulate the reading of another product code:
■
-
the “Check” area contains the first product with quantity equal to 1;
-
the total is incremented by the price of product 1;
-
the terminal window shows the name and the price of the second
product;
Select the “Quantity” field, type on the “C” button of the keypad and then
on the “2” button.
■
Click on the “End” button:
■
-
the “Check” area contains the list of the two products with the relative
quantities and the total;
-
the customer name has been erased;
-
the total has been reset to 0.
