Deck 19: Graphical User Interfaces

Question 1

Which layout manager may change the location and size of existing components when new ones are added?
I FlowLayout
II BorderLayout
III GridLayout

A) I
B) II
C) I and III
D) II and III

Answer 1

B

Question 2

The JFrame has a content pane with a default BorderLayout manager. Which method allows changing it to a FlowLayout manager?

A) setLayout
B) setFlowLayout
C) assignLayout
D) changeLayout

Answer 2

A

Question 3

What is the default layout manager of the content pane of a JFrame?

A) FlowLayout
B) GridLayout
C) BoxLayout
D) BorderLayout

Answer 3

D

Question 4

Which layout manager allows you to add components to it by invoking the container's add method with the component as the only argument to add.
I FlowLayout
II BorderLayout
III GridLayout

A) I
B) II
C) III
D) I and III

Question 5

Which layout manager places objects left-to-right, row by row into a fixed set of rows and columns?

A) FlowLayout
B) BorderLayout
C) BoxLayout
D) GridLayout

Question 6

What is the default layout manager of JPanel?

A) FlowLayout
B) GridLayout
C) BoxLayout
D) GridBagLayout

Question 7

By default, a JPanel uses a _______ layout.

A) border
B) flow
C) grid
D) grid bag

Question 8

Which layout manager uses a grid, but allows selected grid locations to span multiple rows or columns?
I GridBagLayout
II BorderLayout
III GridLayout

A) I
B) II
C) III
D) I and III

Question 9

Which layout manger would be best suited to create a simple navigation GUI with directional arrows for left, right, up, down and enter?

A) GridLayout
B) BorderLayout
C) FlowLayout
D) GridBagLayout

Question 10

Which class has constants called NORTH and SOUTH?

A) FlowLayout
B) BorderLayout
C) BoxLayout
D) GridLayout

Question 11

What is the easiest way to create complex-looking GUI layouts?
I use the GridBagLayout manager
II nest panels, each with its own layout manager
III use multiple layout managers in the same container

A) I
B) II
C) III
D) I and III

Question 12

Which layout manager uses a grid so that each component will always be placed into an area of the same size?
I GridBagLayout
II BorderLayout
III GridLayout

A) I
B) II
C) III
D) I and III

Question 13

If you want to have a tabular arrangement of components, in which columns have different sizes or one component spans multiple columns, a ____ would be appropriate.

A) grid bag layout
B) grid layout
C) flow layout
D) border layout

Question 14

How do you add two buttons to the south area of a frame using the BorderLayout?

A) Add them to a panel, then add the panel to the SOUTH
B) Add one to the SOUTH, then add the second one to the SOUTH
C) Add one to the SOUTH, then add the second one to the CENTER
D) Add one to the CENTER, then add the second one to the SOUTH

Question 15

Which layout manager places objects left-to-right, and creates a new row only if when the current row cannot accommodate another object?

A) FlowLayout
B) BorderLayout
C) BoxLayout
D) GridLayout

Question 16

To create a _____ layout, you supply the number of rows and columns in the constructor, then add the components, row by row, left to right.

A) border
B) grid
C) grid bag
D) boxed

Question 17

Which layout manager constructor call would be best-suited to create a telephone handset GUI which has three rows of three keys each with labels, 1,2,3,4,5,6,7,8,9, and a fourth row with labels *, 0, and #?

A) new GridLayout(3, 4)
B) new GridLayout(4, 3)
C) new FlowLayout(4, 3)
D) new BorderLayout(3, 4)

Question 18

Which layout manager allows you to add components in different orders, with the result being the same GUI appearance?
I FlowLayout
II BorderLayout
III GridLayout

A) I
B) II
C) I and III
D) II and III

Question 19

In Java, each container has its own ____________________, which determines how the components are laid out.

A) container
B) layout manager
C) Swing component
D) frame manager

Question 20

When adding a component to a container with the ____ layout, specify the NORTH, EAST, SOUTH, WEST, or CENTER position.

A) border
B) grid
C) grid bag
D) flow

Question 21

A(n) ____ is used when you have a large set of choices.

A) combo box
B) radio button
C) check box
D) action event

Question 22

What is the container for top-level menu items?

A) menu bar
B) menu item
C) menu GUI
D) top level menus don't use containers

Question 23

Which method can a program use to set the selected choice in a JRadioButton?

A) set
B) setChoice
C) setSelectedItem
D) setSelected

Question 24

What type does the method getSelectedItem in the JComboBox class return?

A) Object
B) String
C) JRadioButton
D) JLabel

Question 25

What type of object can be added into a JComboBox by the addItem method?

A) Object
B) String
C) JRadioButton
D) any non-primitive type

Question 26

Which GUI element allows text entry from the program user?

A) ButtonGroup
B) JComboBox
C) JSlider
D) JPanel

Question 27

Which of the following is not a visual component?

A) JRadioButton
B) JButton
C) ButtonGroup
D) JCheckBox

Question 28

Which method can a program use to set the selected choice in a JComboBox?

A) select
B) setChoice
C) setSelectedItem
D) The selection can only be set through the GUI by the user.

Question 29

When the user selects a menu item, the menu item sends a(n) ___________________.

A) ActionEvent
B) ChangeEvent
C) ItemEvent
D) MouseEvent

Question 30

____________________ are round and have a black dot when selected.

A) Swing components
B) Selection buttons
C) Radio buttons
D) Check boxes

Question 31

Which of the following GUI objects generate(s) action events?
I JComboBox
II JRadioButton
III JButton

A) I
B) I and II
C) I and III
D) I, II and III

Question 32

The statement that would add smallButton to the button group in the following code is _________. JRadioButton smallButton = new JRadioButton("Small");
ButtonGroup group = new ButtonGroup();

A) group.add(new smallButton);
B) group.add(smallButton);
C) smallButton.add();
D) You cannot add smallButton to the button group.

Question 33

When using a combo box, the _______ displays the name of the current selection.

A) text field
B) text area
C) menu item
D) submenu item

Question 34

Which of the following classes have a user-editable area?

A) JCheckBox
B) JComboBox
C) ButtonGroup
D) JRadioButton

Question 35

Which of the following methods returns the object that was selected in the JComboBox?

A) getSelected
B) getItem
C) getChoice
D) getSelectedItem

Question 36

A ________ is a user-interface component with two states: checked and unchecked.

A) radio button
B) check box
C) menu item
D) submenu item

Question 37

Insert the missing code in the following segment. The code intends to get the newly selected item from the combo box. JComboBox facenameCombo = new JComboBox();
String selectedString = __________________________;

A) (String) facenameCombo.getSelected();
B) (String) facenameCombo.getSelectedItem();
C) (String) selectedString.getSelected();
D) (String) selectedString.getSelectedItem();

Question 38

The event that is generated by a slider when its value changes is of type _____.

A) ActionEvent
B) ChangeEvent
C) ItemEvent
D) MouseEvent

Question 39

A ____ is a combination of a list and a text field.

A) radio button
B) combo box
C) check box
D) scroll bar

Question 40

Which of the following classes has a Boolean state that can be set or unset through the GUI?

A) JCheckBox
B) JButton
C) ButtonGroup
D) JMenuItem

Question 41

The _______ interface toolkit has a large set of user-interface components.

A) GUI Builder
B) graphical user
C) Swing
D) JMenu

Question 42

The ChangeEvent class defines no methods. What makes it possible to call the getSource method on a ChangeEvent object?

A) The method is inherited from the Object class.
B) You have to code that method yourself.
C) The method is inherited from the EventObject class.
D) ChangeEvent implements the Event interface

Question 43

What is the best way to start using Swing components?

A) Use a few classes with basic properties and methods, then explore API documentation
B) Learn all the classes in Swing and their inheritance hierarchies
C) Learn all the methods of the JComponent superclass before using any Swing components
D) Use a Swing component only after understanding all of its constructors

Question 44

A complex GUI can be created with a set of nested panels. What should determine the components that go into a single panel?

A) the type of components
B) the size of the components
C) the adjacency of the components
D) the names of the components

Question 45

Examine the code below. What type of class is MyMenuListener? public JMenuItem makeMenuItem(String menuLabel)
{
JMenuItem mini = new JMenuItem(menuLabel);
Class MyMenuListener implements ActionListener
{
Public void actionPerformed(ActionEvent

A) It is an anonymous class
B) It is an inner class
C) It is a JMenuItem subclass
D) It is a JMenu class
E) {
DoSomething();
}
}
Mini.addActionListener(new MyMenuListener());
Return mi;
}

Question 46

Which component can generate action events?
I JMenuBar
II JMenu
III JMenuItem

A) I
B) II
C) III
D) II and III

Question 47

If one ChangeListener is listening for three different JSlider objects, how can we determine which of the three sliders caused the event when the code enters the stateChanged method?

A) It is not possible.
B) We can compare the sliders using the getSource method.
C) We can call the getValueIsAdjusting method.
D) We can compare the sliders using the getSliderSource method.

Question 48

What type of event does the JSlider class generate?

A) ChangeEvent
B) ActionEvent
C) ItemEvent
D) SliderEvent

Question 49

Suppose a JPanel with a BorderLayout manager contains two components: component1, which was added to the NORTH, and component2, which was added to the SOUTH. Which parts of the JPanel will appear?
I North
II South
III Center
IV West
V East

A) I, II and III
B) II, IV an V
C) III, IV and V
D) I, II, III, IV an V

Question 50

What is the best way to discover the set of Swing components?

A) Randomly drag them into a visual appllication with a GUI builder
B) Write code to instantiate each component one at a time
C) Read the documentation for Swing
D) Run the SwingSet demo included in the JDK, Java Development Kit

Question 51

If the makeMenuItem method is called four times, at most how many different actions can be performed by these four newly created MenuItem objects when the doSomethingElse method is called? public JMenuItem makeMenuItem(String menuLabel)
{
JMenuItem mi = new JMenuItem(menuLabel);
Class MyMenuListener implements ActionListener
{
Public void actionPerformed(ActionEvent

A) 1
B) 2
C) 3
D) 4
E) {
DoSomethingElse(e);
}
}
Mi)addActionListener(new MyMenuListener());
Return mi;
}

Question 52

Suppose a JPanel with a BorderLayout manager contains two components: component1, which was added to the CENTER, and component2, which was added to the SOUTH. Which parts of the JPanel will appear?
I North
II South
III Center
IV West
V East

A) I, II
B) I, II, III
C) III, IV and V
D) II and III

Question 53

If a JPanel with a BorderLayout manager contains a single component that was added to the CENTER, which parts of the JPanel does the component fill?
I North
II South
III Center
IV West
V East

A) I, II and III
B) II, IV an V
C) III, IV and V
D) I, II, III, IV and V

Question 54

What is the best first step in picking the layout managers for a set of nested panels?

A) use a single panel with a GridBagLayout manager
B) construct a set of JPanel objects
C) make a sketch of the layout
D) use multiple panels with FlowLayout managers

Question 55

Which code will create a JSlider with a range from 0 to 100, with an initial value of 50?
I new JSlider()
II new JSlider(0, 100, 50)
III new JSlider(50, 0, 100)

A) I
B) II
C) III
D) I and II

Question 56

For a new programmer using the Swing JSlider component for the first time, which of these is the least important thing to know?

A) a basic way to construct a JSlider
B) what type of events it generates
C) how to write the BoundedRangeModel constructor
D) its value when an event occurs

Question 57

What can be determined about obj from the code below? JMenuItem menuItem = new JMenuItem("Exit");
MenuItem.addActionListener(obj);

A) The class of obj implements ActionListener
B) menuItem implements ActionListener
C) obj is of type MenuListener
D) obj is an object of an inner class

Question 58

If the method makeMenuItem is called four times, how many MyMenuListener objects will be created? public JMenuItem makeMenuItem(String menuLabel)
{
JMenuItem mi = new JMenuItem(menuLabel);
Class MyMenuListener implements ActionListener
{
Public void actionPerformed(ActionEvent

A) 1
B) 2
C) 3
D) 4
E) {
DoSomething();
}
}
Mi)addActionListener(new MyMenuListener());
Return mi;
}

Question 59

Which component can be added to a menu?
I JMenuBar
II JMenu
III JMenuItem

A) I
B) I and II
C) II and III
D) I, II and III

Question 60

What method is required by the ChangeListener interface?

A) changeOccured
B) actionPerformed
C) stateChanged
D) sliderMoved

Question 61

You can add a(n) _________ to a panel to make it visible.

A) component
B) JFrame
C) border
D) another panel

Question 62

What is known for certain from this correct code excerpt? ActionListener openListener = new FileOpenListener();
JMenuItem fileOpen = new JMenuItem("Open File");
FileOpen.addActionListener(openListener);

A) fileOpen will open a file dialog when clicked
B) The fileOpen menu item will be visible
C) The FileOpenListener class implements the ActionListener interface
D) The openListener object will only listen to the fileOpen object

Question 63

Suppose a JPanel with a BorderLayout manager contains two components: component1, which was added to the EAST, and component2, which was added to the WEST. Which parts of the JPanel appear?
I North
II South
III Center
IV West
V East

A) I, II
B) I, II, III
C) III, IV and V
D) IV an V

Question 64

Given four JRadioButton objects in a ButtonGroup, how many radio buttons can be selected at the same time?

A) 1
B) 2
C) 4
D) 3

Question 65

Which of the following statements is correct?

A) new JSlider() creates a horizontal slider with the range 0 to 200 and an initial value of 100.
B) new JSlider() creates a horizontal slider with the range 0 to 10 and an initial value of 5.
C) new JSlider() creates a horizontal slider with the range 0 to 100 and an initial value of 50.
D) new JSlider() creates a horizontal slider with the range 0 to 150 and an initial value of 100.

Question 66

Which elements of creating a graphical user interface are made easier by a GUI builder?
I creating event handlers
II configuring component properties
III adding components

A) II
B) I and II
C) I and III
D) I, II and III

Question 67

How do the lifetimes of the three objects menuLabel, mi, and the anonymous object new MyMenuListener()compare? public JMenuItem makeMenuItem(final String menuLabel)
{
JMenuItem mi = new JMenuItem(menuLabel);
Class MyMenuListener implements ActionListener
{
Public void actionPerformed(ActionEvent

A) all have the same lifetimes
B) menuLabel and new MyMenuListener()are the same and both longer than mi
C) mi and new MyMenuListener()are the same and both longer than menuLabel
D) from shortest to longest: menuLabel, new MyMenuListener(), mi
E) {
DoSomethingElse();
System.out.println(menuLabel);
}
}
Mi)addActionListener(new MyMenuListener());
Return mi;
}

Question 68

When method makeMenuItem is called, how many objects are being created? public JMenuItem makeMenuItem(final String menuLabel)
{
JMenuItem mi = new JMenuItem(menuLabel);
Class MyMenuListener implements ActionListener
{
Public void actionPerformed(ActionEvent

A) 1
B) 2
C) 3
D) 4
E) {
DoSomethingElse();
System.out.println(menuLabel);
}
}
Mi)addActionListener(new MyMenuListener());
Return mi;
}

Question 69

The documentation for the JSlider class lists ____ inherited methods.

A) less than 5
B) about 25
C) about 250
D) over 2500

Question 70

Which of the following adds a border to the following panel? JPanel panel = new JPanel();

A) panel.addEtchedBorder();
B) panel.addBorder(new EtchedBorder());
C) panel.add(new EtchedBorder());
D) panel.setBorder(new EtchedBorder());

Question 71

What features do GUI builders have to speed the development of the graphical user interface of the program?
I setting properties of dialog boxes
II automated event-handling code generation
III drag and drop of visual components

A) I
B) II
C) II and III
D) I, II and III

Question 72

Based on the statement below, which of the following adds a title to the border? JPanel panel = new JPanel();

A) panel.setBorder(new TitledBorder());
B) panel.setBorder(new TitledBorder(new EtchedBorder(), "Size"));
C) panel.setBorder(new TitledBorder(new EtchedBorder()));
D) panel.setTitle("Size");

Question 73

What is wrong with the following code? class ExitListener implements ActionListener
{
Public void actionPerformed(ActionEvent event)
{
System.exit(0);
}
}
ActionListener exitListener = new ExitListener();
JMenu exitMenu = new JMenu("Exit");
ExitMenu.addActionListener(exitListener);
JMenuBar menuBar = new JMenuBar();
MenuBar.add(exitMenu);

A) The ExitListener class is not public
B) You cannot attach a listener to a menu, only to a menu item
C) You cannot add a menu to the menu bar, only a menu item
D) You need to use a menu listener, not an action listener

Question 74

When a menu item is selected, what type of event does it send?

A) ActionEvent
B) ChangeEvent
C) ItemEvent
D) SelectionEvent

Question 75

What is the most time-effective way to build a GUI quickly and concentrate on coding the logic of the program?

A) use the GridBagLayout manager
B) use a GUI builder, such as NetBeans
C) use nested panels
D) use menus

Question 76

The code below will not compile successfully unless the argument to the makeMenuItem method is final. Why not? public JMenuItem makeMenuItem(final String menuLabel)
{
JMenuItem mi = new JMenuItem(menuLabel);
Class MyMenuListener implements ActionListener
{
Public void actionPerformed(ActionEvent

A) JMenuItem labels must be final
B) This prevents the menuLabel argument from being modified
C) Because a local variable is being accessed from an inner classes
D) Because the String class is final
E) {
DoSomethingElse();
System.out.println(menuLabel);
}
}
Mi)addActionListener(new MyMenuListener());
Return mi;
}