Deck 12: GUI Applications–Part 2

Question 1

When an item in a Jlist object is selected, it generates a(n)

A) list selection event.
B) click event.
C) action listener event.
D) list listener event.

Answer 1

A

Question 2

To force the JFrame that encloses a window to resize itself automatically when a larger object is placed in the frame, use the ________ method.

A) resize
B) refresh
C) pack
D) extend

Answer 2

C

Question 3

A tool tip is

A) used to make programming easier.
B) a guide provided by the Help menu.
C) text that is displayed in a small box when the user holds the mouse cursor over a component.
D) a key that you press while holding down the Alt key to interact with a component.

Answer 3

C

Question 4

What will be displayed when the following code is executed?
JLabel myLabel = new JLabel ("It's a beautiful morning!"); myLabel.setIcon(SunnyFace.gif);

A) A label will be displayed with the text "It's a beautiful morning!" appearing below the SunnyFace.gif image.
B) A label will be displayed with the text "It's a beautiful morning!" appearing above the SunnyFace.gif image.
C) A label will be displayed with the text "It's a beautiful morning!" appearing to the left of the SunnyFace.gif image.
D) A label will be displayed with the text "It's a beautiful morning!" appearing to the right of the SunnyFace.gif image.

Question 5

What will be the result when the following code is executed if addressList exists and has values stored in it, and addrList is an array with values stored in it?
AddressList.setListData(addrList);

A) The values contained in the addrList array will be appended to the end of the existing values in addressList.
B) The values contained in the addrList array will be inserted at the beginning of the existing values in addressList.
C) The values in addressList will be unchanged.
D) The values in addressList will be replaced by the values in addrList.

Question 6

What is the default directory for the JFileChooser constructor when you pass a String containing a valid path as an argument?

A) If you are using Windows, this will probably be the "My Documents" folder under your account.
B) If you are using UNIX, this will be your login directory.
C) Both A and B
D) None of the above

Question 7

Which of the following file types is not supported by the ImageIcon class?

A) JPEG
B) GIF
C) BMP
D) PNG

Question 8

What will be the result when the following code is executed?
ImagePanel = new JPanel();
ImageLabel = new JLabel();
ImagePanel.Add(imageLabel);
ImageIcon sunnyFaceImage = new ImageIcon("SunnyFace.gif"); imageLabel.setIcon(sunnyFaceImage);
Pack();

A) The image will resize itself to fit the label.
B) The image will resize itself to fit the panel.
C) The panel will resize itself to accommodate the image.
D) The JFrame that encloses the window will resize itself to accommodate the image.

Question 9

A mnemonic is

A) a single key on the keyboard that you press to quickly access a component such as a button.
B) a key on the keyboard that you press in combination with the Ctrl key to quickly access a component such as a button.
C) a key on the keyboard that you press in combination with the Alt key to quickly access a component such as a button.
D) a key on the keyboard that you press in combination with the Shift key to quickly access a component such as a button.

Question 10

What is returned by the JList class's getSelectedIndex method?

A) the index of the selected item
B) -1 if no item is selected
C) Both A and B
D) None of the above

Question 11

Which of the following statements creates a horizontal slider component with a minimum value of 0, a maximum value of 50, and an initial value of 25?

A) JSlider hSlider = new JSlider(0, 50, 25, JSlider.HORIZONTAL);
B) JSlider hSlider = new JSlider(JSlider.HORIZONTAL, 0, 50, 25);
C) JSlider hSlider = new JSlider(0, 50, JSlider.HORIZONTAL, 25);
D) JSlider hSlider = new JSlider(0, JSlider.HORIZONTAL, 50, 25);

Question 12

If null is passed as an argument to the JFileChooser class's showOpenDialog method,

A) the dialog box will be created in memory, but it will not be displayed.
B) the dialog box will be displayed in the lower-right corner of the screen.
C) the dialog box will be displayed in the upper-left corner of the screen.
D) the dialog box will be displayed in the center of the screen.

Question 13

What will be the result of the following code if the user simply clicks OK?
JPanel panel = new JPanel();
Color selectedColor;
SelectedColor =
JColorChooser.showDialog(null, "Select a Color", Color.BLUE);
Panel.setForeground(selectedColor);

A) The foreground color will remain unchanged.
B) The foreground color will be set to blue.
C) The foreground color will be set to black.
D) The foreground color will be set to white.

Question 14

The JComboBox class is in this package.

A) javax.swing
B) java.awt.event
C) java.swing.event
D) java.awt

Question 15

If you call the JTextField component's setEditable method and pass false as the argument, then the text field becomes

A) unbound.
B) editable.
C) invisible.
D) read-only.

Question 16

When you create an instance of the JList class,

A) the text field will be editable.
B) you pass an array of objects to the constructor.
C) you must indicate the maximum number of list items the user may select at any one time.
D) you must indicate a selection mode.

Question 17

If nameList is an instance of a JList component, which of the following statements would display 4 rows in nameList.

A) nameList.setDisplayRowCount(4);
B) nameList.setShowRowCount(4);
C) nameList.setVisibleRowCount(4);
D) nameList.setRowCount(4);

Question 18

Which of the following statements adds the JList object referenced by namesList to the JScrollPane object referenced by namesListScrollPane?

A) JScrollPane namesListScrollPane = new JScrollPane(namesList);
B) namesList.addScrollPane(namesListScrollPane);
C) namesList.add(namesListScrollPane);
D) namesListScrollPane.add(namesList);

Question 19

If myList is a JList component, what will the value of item be after the following statement is executed?
Item = myList.getSelectedIndex();

A) The value of the first selected item in the list.
B) An array of objects containing all the selected items in the list.
C) An array containing the indices of all the selected items in the list.
D) The index of the first selected item in the list.

Question 20

A ________ is a collection of commands organized in one or more drop-down menus.

A) menu system
B) command list
C) main menu
D) drop-down list

Question 21

If multiple items have been selected in a list component, you should use the getSelectedValues or getSelectedIndices methods to retrieve the selected items.

Question 22

The default selection mode for a JList component is

A) single selection mode.
B) multiple interval selection mode.
C) multiple selection mode.
D) single interval selection mode.

Question 23

Just like regular radio button components, you must group radio button menu items in a button group in order to create a mutually exclusive relationship between them.

Question 24

You can create a label with an image or text, but you cannot create a label with both an image and text.

Question 25

To add a component to a scroll pane, you must pass a reference to the component as an argument to the JScrollPane constructor.

Question 26

If you assign the same mnemonic to more than one component in a window, it works only for the first component that you assigned it to.

Question 27

To change an application's look and feel, you call this static method of the UIManager class.

A) setLookAndFeel
B) getLookAndFeel
C) addLookAndFeel
D) showLookAndFeel

Question 28

You assign a tool tip to a component with the ________ method, which is inherited from the JComponent class.

A) setToolTipText
B) setToolTip
C) addToolTip
D) getToolTipText

Question 29

After you create a menu item, you must add it to a JMenu component in order for it to be displayed on the menu.

Question 30

The Dimension class is part of the ________ package.

A) java.awt.menu
B) javax.swing.event
C) javax.swing
D) java.awt

Question 31

The indices for a list or combo box start at 1, not 0.

Question 32

Which of the following is not a class used in constructing a menu system?

A) JRadioButtonMenuItem
B) JCheckBoxMenuItem
C) JButton
D) JMenuItem

Question 33

Which of the following statements assigns the C key as the mnemonic for the JButton object referenced by clearButton?

A) clearButton.addMnemonic(KeyEvent.VK_C);
B) clearButton.setMnemonic(KeyEvent.C);
C) clearButton.assignMnemonic(KeyEvent.VK_C);
D) clearButton.setMnemonic(KeyEvent.VK_C);

Question 34

The ListSelectionListener interface is in the ________ package.

A) javax.swing.event
B) java.awt
C) java.awt.event
D) java.swing

Question 35

What type of event is generated by a slider component when the knob's position is moved?

A) change event
B) move event
C) slide event
D) traverse event

Question 36

To give a combo box a text field, you must call the setEditable method and pass false as an argument.

Question 37

The appearance of a particular system's GUI is known as its

A) art style.
B) user interface.
C) look and feel.
D) system aesthetics.

Question 38

The JList and JTextArea components do not automatically display scroll bars.

Question 39

What does the following statement do?
JTextArea textField = JTextArea(message, 25, 15);

A) It creates a text area with 25 rows and 15 columns that will initially display the text "message."
B) It creates a text area with 25 columns and 15 rows that will initially display the text stored in the String object referenced by message.
C) It creates a text area with 25 columns and 15 rows that will initially display the text stored in the JTextArea object referenced by textField.
D) It creates a text area with 25 rows and 15 columns that will initially display the text stored in the String object referenced by message.

Question 40

When using a slider, by default, tick marks are not displayed, and setting their spacing does not cause them to be displayed.