Deck 24: Swing Gui Components

Question 1

JLabel can be attached to a JFrame using method ________.

A) attach
B) contain
C) append
D) add

Answer 1

D

Question 2

Which of the following statements about a JLabel is false?

A) Applications rarely change a label's contents after creating it.
B) A JLabel can display text and an image.
C) A JLabel can display text and a button.
D) A JLabel is a subclass of JComponent.

Answer 2

C

Question 3

The text "Hello there, my friend." is an example of what type of capitalization?

A) sentence-style capitalization.
B) book-title capitalization.
C) Neither of the above.
D) Both of the above.

Answer 3

sentence-style capitalization.

Question 4

Which method sets the text that's displayed when the user hovers over a JLabel?

A) setHover
B) setHoverText
C) setToolTip
D) setToolTipText

Question 5

Which of the following is not a GUI component (control or widget)?

A) String.
B) Button.
C) Menu.
D) Combo box.

Question 6

Which of the following does not generate GUI events?

A) Typing in a text field.
B) Selecting an item from a menu.
C) Viewing the text in a label.
D) Moving the mouse.

Question 7

Which pair of words does not complete the sentence below correctly? A ________ is a(n) ________.

A) Container, Component.
B) Container, JPanel.
C) JComponent, Container.
D) Component, Object.

Question 8

Which methods retrieve and set the image that's displayed in a JLabel?

A) getIcon, setIcon.
B) getResource, setResource.
C) getText, setText.
D) getImageIcon, setImageIcon.

Question 9

Which of the following statements about Swing GUI components is false?

A) Swing components are less portable but more flexible than the original Java GUI components from package java.awt.
B) Most Swing components are written completely in Java.
C) Swing components allow the user to specify a uniform look-and-feel across all platforms.
D) Swing components allow the user to change the look-and-feel while the program is running.

Question 10

Which of the following expressions creates a JLabel that displays the text "Here is what I look like!" The JLabel should display Icon object face, and the JLabel's contents should be left aligned.

A) new JLabel("Here is what I look like!", face, SwingConstants.LEFT)
B) new JLabel("Here is what I look like!", face, SwingJustification.LEFT)
C) new JLabel("Here is what I look like!", SwingConstants.LEFT, face)
D) new JLabel("Here is what I look like!", SwingJustification.LEFT, face)

Question 11

Which JFrame constant indicates that the program should terminate when the window is closed by the user?

A) TERMINATE_ON_CLOSE.
B) IMMEDIATELY_CLOSE.
C) EXIT_ON_CLOSE.
D) All of the above.

Question 12

The JOptionPane constant used to display an icon prompting the user for input is:

A) JOptionPane.ERROR_MESSAGE.
B) JOptionPane.INFORMATION_MESSAGE.
C) JOptionPane.QUESTION_MESSAGE.
D) JOptionPane.WARNING_MESSAGE.

Question 13

Some common lightweight component features supported by JComponent include:

A) support for user-interface localization.
B) shortcut keys.
C) tool tips.
D) All of the above.

Question 14

__________Provides the basic attributes and behaviors of a window-a title bar at the top of the window, and buttons to minimize, maximize and close the window.

A) JLabel.
B) JFrame.
C) JSwing.
D) JWindowControl.

Question 15

Which component contains menus?

A) Menu button.
B) Title bar.
C) Menu bar.
D) Combo box.

Question 16

Which of the following statements for a JTextField is false?

A) Can be used to display uneditable text.
B) Can be used to display editable text.
C) Enables users to enter data from the keyboard.
D) Displays a list of fields.

Question 17

Which of the following is the method used to display a dialog box to gather input?

A) showMessageDialog.
B) getInput.
C) inputDialog.
D) showInputDialog.

Question 18

Method _____________-can be used to set the layout manager of a container.

A) setManager
B) setLayout
C) setLayoutManager
D) setGUILayout

Question 19

Together, the appearance and the way in which the user interacts with the application are known as that application's ________.

A) abstract window toolkit.
B) look-and-feel.
C) swing factor.
D) All of the above.

Question 20

Which of the following statements about heavyweight components is false?

A) AWT components are not heavyweight components.
B) Several Swing components are heavyweight components.
C) The look-and-feel may vary across platforms.
D) The functionality may vary across platforms.

Question 21

Which of the following is false?

A) A JPasswordField shows that characters are being entered, but hides the actual character with an echo character.
B) Class JTextField extends JTextComponent; Class JPasswordField extends JTextField.
C) Both JTextFields and JPasswordFields are single-line areas in which the user can enter text via the keyboard.
D) JPasswordFields generate events; JTextFields do not.

Question 22

A JRadioButton is different from a JCheckBox in that _________.

A) a JRadioButton is a subclass of JToggleButton, JCheckBox is not.
B) normally several JRadioButtons are grouped together and are mutually exclusive.
C) a JRadioButton is a type of button, JCheckBox is not.
D) a JRadioButton is a state button, JCheckBox is not.

Question 23

Which of the following answers does not complete the sentence correctly? An anonymous inner class__________ .

A) is frequently used for GUI event handling
B) is non-static
C) does not need a handle to its outer class to access its methods and variables
D) cannot be declared private

Question 24

Which of the following choices completes the sentence correctly?
A(n)_____ is a(n)______ .

A) JToggleButton, JCheckBox
B) JToggleButton, JRadioButton
C) JButton, JToggleButton
D) JButton, AbstractButton

Question 25

Every JComponent has an instance variable called ____that enables the object to maintain references to all its registered listeners.

A) registeredListenerList
B) listenerList
C) registeredList
D) eventListenerList

Question 26

Which of the following most completely describes the steps for setting up event handling for a GUI component?

A) Create a class that represents the event handler, attach the JFrame to a JWindow object and register the event handler.
B) Implement an appropriate event-listener interface and register the event handler.
C) Create a class that represents the event handler and implement an appropriate event-listener interface.
D) Create a class that represents the event handler, implement an appropriate event-listener interface and register the event handler.

Question 27

Which of the following completes the sentence below correctly?
A(n)_____________________ is a(n)________________- .

A) InputEvent, MouseEvent.
B) ActionEvent, AdjustmentEvent.
C) FocusEvent, WindowEvent.
D) ContainerEvent, ComponentEvent.

Question 28

Which of the following is not necessary to use the event delegation model?

A) An event listener must be registered.
B) An event handler must be implemented.
C) The appropriate interface must be implemented.
D) The appropriate interface must be registered.

Question 29

The logical relationship between radio buttons is maintained by objects of what class?

A) MutualExclusionGroup
B) RadioButtonGroup
C) Group
D) ButtonGroup

Question 30

Forgetting to register an event-handler object for a particular GUI component's event type causes ___________.

A) events of that type to be ignored.
B) all of the GUI component's events to be ignored.
C) a compilation error.
D) None of the above.

Question 31

When the user clicks a JCheckBox, a(n)_______ occurs.

A) CheckedEvent
B) ButtonEvent
C) ItemEvent
D) ActionEvent

Question 32

How many event-listener interfaces correspond to each event type?

A) one.
B) two.
C) one or more.
D) zero.

Question 33

Which of the following is not a type of button?

A) command buttons.
B) toggle buttons.
C) check boxes.
D) All of the above are types of buttons.

Question 34

The method setRolloverIcon is used to ________.

A) Handle a key event
B) Change the button text
C) Change the button icon
D) All of the above

Question 35

GUI event with which the user interacts is the ________________.

A) event effector.
B) event container.
C) event raiser.
D) event source.

Question 36

Which method determines if a JCheckBox is selected?

A) isSelected
B) getSelected
C) selected
D) None of the above

Question 37

Which of the following statements makes the text in a JTextField uneditable?

A) textField.setEditable(true);
B) textField.setEditable(false);
C) textField.setUneditable(true);
D) textField.setUneditable(false);

Question 38

Which of the following is stateless?

A) JButton.
B) JToggleButton.
C) JRadioButton.
D) JCheckBox.

Question 39

When the user presses Enter in a JPasswordField, the GUI component generates an_______ , which is processed by an object that implements the interface___________ .

A) ActionEvent, ActionListener.
B) ActionEvent, ActionEventListener.
C) TextEvent, TextListener.
D) TextEvent, TextEventListener.

Question 40

JPasswordField contains method ______________to obtain the data entered.

A) getInput.
B) getPassword.
C) getText.
D) getEcho.

Question 41

Method paintComponent is called when:

A) a lightweight Swing component is created.
B) a lightweight Swing component is displayed.
C) a lightweight Swing component is clicked.
D) an application exits.

Question 42

A user of a one-button mouse can simulate pushing the middle button on a three-button mouse by holding the___________ while clicking the left mouse button.

A) Alt key.
B) Meta key.
C) Ctrl key.
D) Shift key.

Question 43

Method getSelectedValues of class JList returns:

A) an array of ints representing the indices of the selected items.
B) an array of doubles representing the indices of the selected items.
C) an array of Strings representing the selected items.
D) an array of Objects representing the selected items.

Question 44

In what cases are adapter classes useful?

A) When an adapter GUI control is clicked.
B) When every method in the event-listener interface is to use the same functionality.
C) When it is not desirable to declare every method in the event-listener interface.
D) None of the above.

Question 45

The setMaximumRowCount method is used for:

A) Button.
B) JComboBox.
C) JRadioButton.
D) JToggleButton.

Question 46

Class Point represents ________.

A) a filled oval
B) an x-y coordinate pair
C) an object used to draw
D) a period in a sentence

Question 47

Adding a ButtonGroup object to a container ________.

A) is necessary for the functionality of the ButtonGroup to work properly.
B) causes all the JRadioButtons in the group to have their event handlers registered.
C) results in a compilation error.
D) None of the above.

Question 48

Which of the following statements about anonymous inner classes is false?

A) They are declared without a name.
B) They typically appear inside a method declaration.
C) They are declared with the anonymous keyword.
D) They can access their top-level class's members.

Question 49

Which of the following is a MouseMotionListener method?

A) mousePressed.
B) mouseExited.
C) mouseDragged.
D) mouseClicked.

Question 50

Selecting a JList item generates ________.

A) an ActionEvent
B) a ListItemEvent
C) a ListSelectionEvent
D) a ListSelectionItemEvent

Question 51

Method getSelectedIndex of class JComboBox returns:

A) the index of the selected item in the JComboBox.
B) the selected item in the JComboBox, as a String.
C) the index of the previously selected item.
D) None of the above.

Question 52

Which MouseEvent method can be used to determine if the Alt key is pressed?

A) isAltPressed.
B) isAltDown.
C) getClickCount.
D) AltPressed.

Question 53

When a component is_________- , paintComponent clears the component's background before the component is displayed.

A) transparent
B) opaque
C) oblique
D) concave

Question 54

Which of the following objects cannot trap mouse events?

A) JTextField.
B) ButtonGroup.
C) JButton.
D) JComponent.

Question 55

When the arrow on a JComboBox is clicked:

A) an ItemEvent occurs.
B) a scrollbar always appears.
C) an ActionEvent occurs.
D) The JComboBox expands to a list.

Question 56

Consider the list below:
January
February
March
April
May
June
July
August
September
October
November
December
What type of JList selection mode would allow the user to select March, June and July in one step?

A) SINGLE_SELECTION.
B) SINGLE_INTERVAL_SELECTION.
C) MULTIPLE_INTERVAL_SELECTION.
D) All of the above.

Question 57

The BorderLayout layout manager:

A) divides an area into five regions: NORTH, SOUTH, EAST, WEST and CENTER.
B) divides an area into five regions: UP, DOWN, LEFT, RIGHT and MIDDLE.
C) orders components vertically.
D) order components horizontally.

Question 58

Which of the following statements about adapters is false?

A) An adapter class implements an interface.
B) An adapter class provides a default (empty) implementation of every method in the interface.
C) Programmers override selected adapter methods.
D) A ComponentListener is a ComponentAdaptor.

Question 59

A JScrollPane is provided automatically for which of the following?

A) JToggleButton.
B) JRadioButton.
C) JList.
D) None of the above.

Question 60

A MouseHandler object implements which two interfaces?

A) MouseListener and MouseActionListener.
B) MouseListener and MouseMotionListener.
C) MouseListener and MouseEventListener.
D) MouseListener only.

Question 61

Which of the following statements about JPanels is false?

A) A JPanel is a JComponent.
B) A JPanel is a Container.
C) A JPanel does not have a content pane.
D) A JPanel has a fixed size.

Question 62

BorderLayout implements interface ________.

A) ActionListener
B) FlowLayout.
C) Layout
D) LayoutManager2

Question 63

FlowLayout is ________.

A) an abstract class
B) a way of organizing components vertically
C) the simplest layout manager
D) left-aligned by default

Question 64

Using layout managers ________.

A) provides the greatest level of control over a GUI's appearance
B) can be faster than creating a GUI with absolute positioning
C) allows the programmer to specify the exact location of each GUI component with respect to the upper-left corner of the Container
D) allows the programmer to specify the exact location of each GUI component with respect to the lower-left corner of the Container

Question 65

Class JTextArea's getSelectedText method ________.

A) returns the text in the JTextArea
B) returns the selected text in the JTextArea
C) displays only the selected text in the JTextArea
D) sets the selected text in the JTextArea

Question 66

The Shift key is a(n)__________- key.

A) modifier
B) action
C) output
D) None of the above

Question 67

When components are added to a container with a GridLayout, the component ________.

A) fills the next spot in the row, continuing in the first position of the next row if the current row is full
B) fills the next spot in the column, continuing in the first position of the next column if the column is full
C) fills in row x, column y if x and y are two integers passed to the Container method add
D) fills in a random empty position in the grid

Question 68

A JTextArea ________.

A) provides a bounding box used for the layout of JTextFields
B) wraps lines by default
C) provides an area for manipulating multiple lines of text
D) provides scrollbars for JTextFields

Question 69

Which of the following is not a KeyListener method?

A) keyPressed.
B) keyReleased.
C) keyClicked.
D) keyTyped.

Question 70

Each container can have ________.

A) only one layout manager
B) one or more layout managers
C) zero or more layout managers
D) only one or two layout managers

Question 71

By default JScrollPane ________.

A) always displays scrollbars
B) never displays scrollbars
C) only displays scrollbars if they are needed
D) None of the above

Question 72

The class GridLayout constructs to hold components.

A) a horizontal grid with one row
B) a vertical grid with one column
C) a grid with multiple rows and columns
D) a square grid with the same number of rows as columns

Question 73

Which region is used by default when a Component is added to a BorderLayout?

A) NORTH
B) CENTER
C) WEST
D) LEFT

Question 74

Method _________indicates that a Component should be refreshed on screen as soon as possible with a call to that control's paintComponent method.

A) refresh
B) repaint
C) repaintComponent
D) redraw

Question 75

All layout managers implement the interface ________.

A) LayoutInterface
B) InterfaceLayoutManager
C) LayoutManagerInterface
D) LayoutManager

Question 76

Which layout manager is the default for JFrame?

A) FlowLayout
B) BorderLayout
C) GridLayout
D) None of the above

Question 77

Which methods can be used to change the scrollbar policies?

A) setHoizontalPolicy, setVerticalPolicy.
B) setHorizontal, setVertical.
C) setHPolicy, setVPolicy.
D) setHorizontalScrollBarPolicy, setVerticalScrollBarPolicy.

Question 78

FlowLayout method_________ changes the alignment for the FlowLayout.

A) setLayout
B) modifyAlignment
C) setAlignment
D) setAlign