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Chapter 11 - A GUI Interacting With a Problem Domain Class 1
Chapter 11
A GUI Interacting With a Problem Domain Class
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Chapter 11 - A GUI Interacting With a Problem Domain Class 2
1. Adding a New Customer Develop a new GUI class named
AddCustomer to input customer attribute values and then create instances of the Customer class
See Figure 11-4
Chapter 11 - A GUI Interacting With a Problem Domain Class 3
Adding a New Customer
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Adding a New Customer You need to start by importing the classes it uses:
The java.awt class has the Font and Color classes The javax.swing class contains the GUI components The ActionEvent and ActionListener interfaces are in the
java.awt.event class
JTextField instances are used to input the customer’s name, address, and phone number
JButton instances are used after the customer data is entered, to clear the text fields, and to end processing
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Chapter 11 - A GUI Interacting With a Problem Domain Class 5
Creating the Logo Panel The JLabel class is used to contain the
marina’s logo The foreground color is set to red using the
Color.red constant The font is set to Times Roman 36 point
italic using the “TimesRoman” font name, and the Font.ITALIC constant
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Creating the Center Panel The customer name, address, and phone
text boxes are added to the centerPanel This panel is added to the Frame instance The SwingConstants class is used to set the
alignment LEFT RIGHT CENTER
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Creating the Lower Panel Three button instances are added to the
lower panel to support the Add, Clear, and Close operations
You need to call the addActionListener method for each button to process the events
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Handling Events An anonymous inner class is defined to
handle events The actionPerformed method determines
which button was clicked, and then invokes the appropriate method to handle the event
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Using a Dialog Box If the user clicks the Add button, but hasn’t
entered valid data, an error message should be displayed
The statement to display a simple dialog box with a message that requires the user to click the OK button to continue is:JOptionPane.showMessageDialog(this,“message”);
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Using a Dialog Box
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2. Finding a Customer (Fig. 11-6) The FindCustomer class will allow a user to find
a customer and then display their address and phone number
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Creating a Vector of Customers Two vector variables are used to hold a list
of customers and their names The add method is used to add Customer
objects to the vector
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Using the JList Class The JList class is used to display a list of
customer names When the user selects a name and then
clicks on the Find button, that customer’s name and address are displayed
The JList constructor takes a Vector object which contains the data that is displayed
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Adding Text Fields JTextField objects are created to display the
address and phone number A JTextField object is used to allow the user
to update these values
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3. Adding a Boat Develop a GUI that allows you to add a new
boat to the marina system You can add a PowerBoat or SailBoat See Figure 11-13
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Adding a Boat11
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Adding a Boat
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Using Radio Buttons The radio buttons are used to indicate the
type of boat you are adding The RadioButton constructor takes two
arguments The caption to be displayed The buttons initial state – true if selected, false
otherwise
You can trigger a radio button click event by calling doClick
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Add A Sailboat11
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Add A PowerBoat
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The clearForm Method To blank out the text fields use the setText
method – pass an empty string as the argument: manufacturerText.setText(“”);
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