Use the information in this lesson and the component components/componentlisthow-to sections to help you complete these questions and exercises.
Question 1: Find the component that best fits each of the following needs. Write down both the component&146;s common name (such as &147;frame&148;) and find the component's how-to page online. [Hint: You can use components/componentsA Visual Index to the Swing Components to help you answer this question.]
Question 1a: A component that lets the user
pick a color.
Answer 1a: http://java.sun/docs/books/tutorial/uiswing/components/colorchoosercolor
chooser
Question 1b: A component that displays an icon,
but that doesn&146;t react to user clicks.
Answer 1b: http://java.sun/docs/books/tutorial/uiswing/components/labellabel
Question 1c: A component that looks like a
button and that, when pressed, brings up a menu of items for the user to
choose from.
Answer 1c: http://java.sun/docs/books/tutorial/uiswing/components/comboboxuneditable
combo box
Question 1d: A container that looks like a
frame, but that appears (usually with other, similar containers) within
a real frame.
Answer 1d: http://java.sun/docs/books/tutorial/uiswing/components/internalframeinternal
frame
Question 1e: A container that lets the user
determine how two components share a limited amount of space.
Answer 1e: http://java.sun/docs/books/tutorial/uiswing/components/splitpanesplit
pane
Question 2: Which method do you
use to add a menu bar to a top-level container such as a JFrame?
Answer 2: http://java.sun/j2se/1.4.2/docs/api/javax/swing/JFramesetJMenuBar(javax.swing.JMenuBar)setJMenuBar
Question 3: Which method do you
use to specify the button for a top-level container such
as a JFrame or JDialog?
Answer 3: JRootPane's http://java.sun/j2se/1.4.2/docs/api/javax/swing/JRootPanesetButton(javax.swing.JButton)setButton
method. (You get the top-level container's root pane using the http://java.sun/j2se/1.4.2/docs/api/javax/swing/RootPaneContainergetRootPane()getRootPane
method defined by the RootPaneContainer interface, which every
top-level container implements.)
Question 4: Which method do you
use to enable and disable components such as JButtons?
What class is it defined in?
Answer 4: http://java.sun/j2se/1.4.2/docs/api/java/awt/ComponentsetEnabled(boolean)setEnabled,
which is defined in the Component class
Question 5a: Which Swing components use http://java.sun/j2se/1.4.2/docs/api/javax/swing/ListSelectionModelListSelectionModel?
[Hint: The &147;Use&148; link at the top of the specification for
each interface and class takes you to a page showing where in the API that
interface or class is referenced.]
Answer 5a: http://java.sun/j2se/1.4.2/docs/api/javax/swing/JListJList
and http://java.sun/j2se/1.4.2/docs/api/javax/swing/JTableJTable
Question 5b: Do those components
use any other models to handle other aspects of the components&146;
state? If so, list the other models&146; types.
Answer 5b: JList also uses a ListModel,
which holds the list's data. JTable uses a TableModel
to hold its data and a TableColumnModel to manage the table's
columns.
Question 6: Which type of model
holds a text component&146;s content?
Answer 6: http://java.sun/j2se/1.4.2/docs/api/javax/swing/text/DocumentDocument
Exercise 1. Implement a program
with a GUI that looks like the one shown below. Put the main
method in a class named MyDemo1.
uiswing/QandE/MyDemo1 16599ALIGNNATURALSIZEFLAG3ALTMyDemo1
Answer 1: See MyDemo1.javaexample-1dot4/MyDemo1.javasourceIcon (in a .java source file)
Here's the code that adds the bold, italicized text:
Exercise 2. Make a copy of MyDemo1.java
named MyDemo2.java. Add a menu bar to MyDemo2.
Answer 2: See MyDemo2.javaexample-1dot4/MyDemo2.javasourceIcon (in a .java source file)
The menu bar can be implemented
with this code:
Exercise 3. Copy MyDemo1.java
to MyDemo3.java. Add a button (JButton) to MyDemo3.java.
Make it the button.
Answer 3: See MyDemo3.javaexample-1dot4/MyDemo3.javasourceIcon (in a .java source file)
Here's the code that adds the button
and makes it the button: