Starting Out With Java Tony Gaddis - Chapter 13

Front 1

You can use this method to make a text field read-only.a. setReadOnlyb. setChangeablec. setUneditabled. setEditable

Back 1

1. d

Front 2

A JList component generates this type of event when the user selects an item.a. action eventb. item eventc. list selection eventd. list change event

Back 2

2. c

Front 3

To display a scroll bar with a JList component, you must __________.a. do nothing; the JList automatically appears with scroll bars if necessaryb. add the JList component to a JScrollPane componentc. call the setScrollBar methodd. none of the above; you cannot display a scroll bar with a JList component

Back 3

3. b

Front 4

This is the JList component’s default selection mode.a. single selectionb. single interval selectionc. multiple selectiond. multiple interval selection

Back 4

4. d

Front 5

A list selection listener must have this method.a. valueChangedb. selectionChangedc. actionPerformedd. itemSelected

Back 5

5. a

Front 6

The ListSelectionListener interface is in this package.a. java.awtb. java.awt.eventc. javax.swing.eventd. javax.event

Back 6

6. c

Front 7

This JList method returns 21 if no item in the list is selected.a. getSelectedValueb. getSelectedItemc. getSelectedIndexd. getSelection

Back 7

7. c

Front 8

A JComboBox component generates this type of event when the user selects an item.a. action eventb. item eventc. list selection eventd. list change event

Back 8

8. a

Front 9

You can pass an instance of this class to the JLabel constructor if you want to displayan image in the label.a. ImageFileb. ImageIconc. JLabelImaged. JImageFile

Back 9

9. b

Front 10

This method can be used to store an image in a JLabel or a JButton component.a. setImageb. storeImagec. getIcond. setIcon

Back 10

10. d

Front 11

This is text that appears in a small box when the user holds the mouse cursor over a component. a. mnemonic b. instant message c. tool tip d. pop-up mnemonic

Back 11

11. c

Front 12

This is a key that activates a component just as if the user clicked it with the mouse. a. mnemonic b. key activator c. tool tip d. click simulator

Back 12

12. a

Front 13

To display an open file or save file dialog box, you use this class.a. JFileChooserb. JOpenSaveDialogc. JFileDialogd. JFileOptionPane

Back 13

13. a

Front 14

To display a dialog box that allows the user to select a color, you use this class.a. JColorb. JColorDialogc. JColorChooserd. JColorOptionPane

Back 14

14. c

Front 15

You use this class to create a menu bar.a. MenuBarb. JMenuBarc. JMenud. JBar

Back 15

15. b

Front 16

You use this class to create a radio button menu item.a. JMenuItemb. JRadioButtonc. JRadioButtonItemd. JRadioButtonMenuItem

Back 16

16. d

Front 17

You use this method to place a menu bar on a JFrame.a. setJMenuBarb. setMenuBarc. placeMenuBard. setJMenu

Back 17

17. a

Front 18

The setPreferredSize method accepts this as its argument(s).a. a Size objectb. two int valuesc. a Dimension objectd. one int value

Back 18

18. c

Front 19

Components of this class are multi-line text fields.a. JMultiLineTextFieldb. JTextAreac. JTextFieldd. JEditField

Back 19

19. b

Front 20

This method is inherited from JComponent and changes the appearance of a component’stext.a. setAppearanceb. setTextAppearancec. setFontd. setText

Back 20

20. c

Front 21

This method sets the intervals at which major tick marks are displayed on a JSlidercomponent.a. setMajorTickSpacingb. setMajorTickIntervalsc. setTickSpacingd. setIntervals

Back 21

21. a

Front 22

True or False: You can use code to change the contents of a read-only text field.

Back 22

22. True

Front 23

True or False: A JList component automatically appears with a line border drawn around it.

Back 23

23. False

Front 24

True or False: In single interval selection mode, the user may select multiple items from a JList component.

Back 24

24. True

Front 25

True or False: With an editable combo box the user may only enter a value that appears in the component’s list.

Back 25

25. False

Front 26

True or False: You can store either text or an image in a JLabel object, but not both.

Back 26

26. False

Front 27

True or False: You can store large images as well as small ones in a JLabel component.

Back 27

27. True

Front 28

True or False: Mnemonics are useful for users who are good with the keyboard.

Back 28

28. True

Front 29

True or False: A JMenuBar object acts as a container for JMenu components.

Back 29

29. True

Front 30

True or False: A JMenu object cannot contain other JMenu objects.

Back 30

30. False

Front 31

True or False: A JTextArea component does not automatically display scroll bars.

Back 31

31. True

Front 32

True or False: By default, a JTextArea component does not perform line wrapping.

Back 32

32. True

Front 33

True or False: A JSlider component generates an action event when the slider knob is moved.

Back 33

33. False

Front 34

True or False: By default, a JSlider component displays labels and tick marks.

Back 34

34. False

Front 35

True or False: When labels are displayed on a JSlider component, they are displayed on the major tick marks.

Back 35

35. True

Front 36

// Create a read-only text field.

JTextField textField = new JTextField(10);textField.setEditable(true);

Back 36

The argument falseshould have been passed to the setEditablemethod.

Front 37

// Create a black 1-pixel border around list, a JList component.list.setBorder(Color.BLACK, 1);

Back 37

The code should read: list.setBorder(BorderFactory.createLineBorder(Color.black, 1));

Front 38

// Create a JList and add it to a scroll pane.

// Assume that array already exists.

JList list = new JList(array);

JScrollPane scrollPane = new JScrollPane();scrollPane.add(list);

Back 38

You should pass list as an argument to the JScrollPane constructor: JScrollPane scrollPane = new JScrollPane(list);

Front 39

// Assume that nameBox is a combo box and is properly set up

// with a list of names to choose from.

// Get value of the selected item.

String selectedName = nameBox.getSelectedIndex();

Back 39

The statement should read: String selectedName = (String) nameBox.getSelectedItem();

Front 40

JLabel label = new JLabel("Have a nice day!");label.setImage(image);

Back 40

The second statement should read: label.setIcon(image);

Front 41

// Add a menu to the menu bar.

JMenuBar menuBar = new JMenuBar(menuItem);

Back 41

You pass a JMenu object as an argument to the JMenuBar object's add method: JMenuBar menuBar = new JMenuBar(); menuBar.add(menu);

Front 42

// Create a text area with 20 columns and 5 rows.

JTextArea textArea = new JTextArea (20, 5);

Back 42

The statement should read: JTextArea textArea = new JTextArea (5, 20);

Front 43

What selection mode should you select if you want the user to select a single item onlyin a list?

Back 43

Single selection mode

Front 44

You want to provide 20 items in a list for the user to select from. Which component would take up less space, a JList or a JComboBox?

Back 44

JComboBox

Front 45

What is the difference between an uneditable combo box and an editable combo box? Which one is a combo box by default?

Back 45

An uneditable combo box combines a button with a list, and allows the user to only select items from its list. An editable combo box combines a text field and a list. In addition to selecting items from the list, the user may also type input into the text field. The default type of combo box is uneditable.

Front 46

Describe how you can store both an image and text in a JLabel component.

Back 46

You can pass the text as an argument to the constructor, and then pass an ImageIcon object to the setIcon method. Another way is to pass the text, an ImageIcon object, and an int specifying horizontal alignment to the JLabel constructor.

Front 47

What is a mnemonic? How does the user use it?

Back 47

A mnemonic is a key on the keyboard that you press in combination with the Alt key to quickly access a component such as a button. When you assign a mnemonic to a button, the user can click the button by holding down the Alt key and pressing the mnemonic key.

Front 48

What happens when the mnemonic that you assign to a component is a letter that appears in the component’s text?

Back 48

The first occurrence of that letter appears underlined.

Front 49

What is a tool tip? What is its purpose?

Back 49

A tool tip is text that is displayed in a small box when the user holds the mouse cursor over a component. The box usually gives a short description of what the component does.

Front 50

What do you do to a group of radio button menu items so that only one of them can be selected at a time?

Back 50

Add them to a ButtonGroup object.

Front 51

When a checked menu item shows a check mark next to it, what happens when the user clicks on it?

Back 51

The item is deselected, which causes the check mark to disappear. The checked menu item component also generates an action event.

Front 52

What fonts does Java guarantee you have?

Back 52

Dialog, DialogInput, SansSerif, Serif, and Monospaced

Front 53

Why would a JSlider component be ideal when you want the user to enter a number, but you want to make sure that the number is within a range?

Back 53

Because, as the user moves the JSlider component's knob, it will only take on values within its established range.

Front 54

What are the standard GUI looks and feels that are available in Java?

Back 54

Metal, Motif, and Windows