Help is available for each task, or you can go straight to
the solution source code.
Task 1
Save image JAR File to your working
directory.
The file must be in the same directory as your program.
Task 2
Starting with the skeleton, create
a ButtonGroup named sizeGroup with three
JRadioButton objects in it. So the included event
handling code works without modifications, the sizeGroup
variable needs to be final, while the button labels need
to be "Small", "Medium", and "Large".
Have the "Large" toggle initially selected. For each of
the buttons, associate an ActionCommand of the text label.
This will allow you to ask the ButtonGroup which
JRadioButton is selected.
final ButtonGroup sizeGroup = new ButtonGroup();
JRadioButton small =
new JRadioButton("Small", false);
small.setActionCommand("Small");
sizeGroup.add (small);
JRadioButton medium =
new JRadioButton("Medium", false);
medium.setActionCommand("Medium");
sizeGroup.add (medium);
JRadioButton large =
new JRadioButton("Large", true);
large.setActionCommand("Large");
sizeGroup.add (large);
Task 3
Place the radio buttons within a vertical Box in the west
area of the screen. Add a "Size" label to the top of the box.
Have the box appear in the vertical-middle of the area with 5 pixels
separating the items.
The content pane for the JFrame can be referenced by the local
variable content.
Box sizes = Box.createVerticalBox();
sizes.add(Box.createGlue());
sizes.add (new JLabel ("Size:"));
sizes.add (Box.createVerticalStrut (5));
sizes.add (small);
sizes.add (Box.createVerticalStrut (5));
sizes.add (medium);
sizes.add (Box.createVerticalStrut (5));
sizes.add (large);
sizes.add(Box.createGlue());
content.add (sizes, BorderLayout.WEST);
Task 4
For the toppings, create three JCheckBox items, named
peppers, pepperoni, and pineapple with
appropriate text labels for the three toppings. They should all
start out unselected, and the variables all need to be final
so the event handling code works unchanged.
final JCheckBox peppers = new JCheckBox(
"Green Peppers", false);
final JCheckBox pepperoni = new JCheckBox(
"Pepperoni", false);
final JCheckBox pineapple = new JCheckBox(
"Pineapple", false);
Task 5
For each of the checkboxes, instead of using the default toggle
box, create icons in the appropriate color for both the selected
and unselected states. There is a support class provided,
ColoredToggle to use to create each icon. Its constructor
requires a color and the toggle state. There are three predefined
colors that you can use:
- pepperColor
- pepperoniColor
- pineappleColor
Icon peppersUnselected = new ColoredToggle (
pepperColor,
false);
Icon peppersSelected = new ColoredToggle (
pepperColor,
true);
Icon pepperoniUnselected = new ColoredToggle (
pepperoniColor,
false);
Icon pepperoniSelected = new ColoredToggle (
pepperoniColor,
true);
Icon pineappleUnselected = new ColoredToggle (
pineappleColor,
false);
Icon pineappleSelected = new ColoredToggle (
pineappleColor,
true);
Task 6
Associate the icons to the appropriate JCheckBox objects. Use
the setIcon() method to associate the icon for the unselected
state and setSelectedIcon for the selected state icon.
peppers.setIcon(peppersUnselected);
peppers.setSelectedIcon(peppersSelected);
pepperoni.setIcon(pepperoniUnselected);
pepperoni.setSelectedIcon(pepperoniSelected);
pineapple.setIcon(pineappleUnselected);
pineapple.setSelectedIcon(pineappleSelected);
Task 7
Place the checkboxes within a vertical Box in the east area
of the screen. Add a "Toppings" label to the top of the
box. Have the box appear in the vertical-middle of the area with 5
pixels separating the items.
The content pane for the JFrame can be referenced by the
local variable content.
Box toppings = Box.createVerticalBox();
toppings.add(Box.createGlue());
toppings.add (new JLabel ("Toppings:"));
toppings.add (Box.createVerticalStrut (5));
toppings.add (peppers);
toppings.add (Box.createVerticalStrut (5));
toppings.add (pepperoni);
toppings.add (Box.createVerticalStrut (5));
toppings.add (pineapple);
toppings.add(Box.createGlue());
content.add (toppings, BorderLayout.EAST);
Task 8
Create a JScrollPane with a JLabel for the center
part of the screen. The label will be used to display the pizza image.
It needs to be named imageLabel and be a final variable.
Place the label in the scroll pane with the JScrollPane
constructor.
The content pane for the JFrame can be referenced by the
local variable content.
final JLabel imageLabel = new JLabel();
JScrollPane imagePanel = new JScrollPane(imageLabel);
content.add (imagePanel, BorderLayout.CENTER);
Task 9
The pizza ordering button is already added to the screen for you in
the South quadrant, so save everything and compile the program. Then
run it to see the results. Be sure to try all the different toppings
since the pizza is free of calories.
As a precaution, the Save command appends a "1"
to the end of the filename you want to save. This can help
prevent you from accidently overwriting your source code.
javac Order.java
java Order
If you are using Swing with JDK 1.1.+, make sure your CLASSPATH
environment variable has the swingall.jar file in it.
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MageLang Institute.
All Rights Reserved.
