Deck 14: Introduction to Swing Components

Question 1

When setting a JFrame's size, part of the area is unusable because it is consumed by the JFrame's title bar and borders.

Answer 1

True

Question 2

You can use the setEnabled() method to make a component unavailable and then make it available again in turn.

Answer 2

True

Question 3

An object that is interested in an event is called a source.

Answer 3

False

Question 4

The JLabel constructor ____ creates a JLabel instance with the specified image and horizontal alignment.

A) JLabel(String text, int horizontalAlignment)
B) JLabel(Icon image)
C) JLabel()
D) JLabel(Icon image, int horizontalAlignment)

Question 5

Java provides you with a Font class from which you can create an object that holds typeface and size information.

Question 6

The default behavior of a JFrame is to use the BorderLayout format, which divides a container into regions.

Question 7

You use the ____ method to obtain the title of a JFrame.

A) getTitle()
B) title()
C) setTitle()
D) setVisible()

Question 8

What is the default layout manager for JFrame?

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

Question 9

What is the immediate parent class of JTextField?

A) JTextComponent
B) JComponent
C) Container
D) JFrame

Question 10

When creating a Font object, the typeface name must be enclosed in double quotation marks because it is a String.

Question 11

You can call a JFrame's setDefaultCloseOperation() method and use ____ as an argument to keep the JFrame visible and continue running the program.

A) JFrame.EXIT_ON_CLOSE
B) WindowConstants.DISPOSE_ON_CLOSE
C) WindowConstants.DO_NOTHING_ON_CLOSE
D) WindowConstants.HIDE_ON_CLOSE

Question 12

You define the text to be displayed in a tool tip by using the setToolTipText() method and passing an appropriate ____ to it.

A) Integer
B) Date
C) String
D) Boolean

Question 13

When a user closes a JFrame by clicking the Close button in the upper-right corner, the default behavior is for the JFrame to close and the application to terminate.

Question 14

When a JFrame is closed, you can end a program that you have forgotten to exit by typing Ctrl+E.

Question 15

The Swing classes are part of a more general set of UI programming capabilities that are collectively called the ____.

A) JavaX Classes
B) Java Foundation Classes
C) UI packages
D) Java Extension Libraries

Question 16

A ____ is a Component the user can click with a mouse to make a selection.

A) JCheckBox
B) JButton
C) JLabel
D) JComboBox

Question 17

To specify an italic font, you pass ____ to the constructor.

A) Font.ITALIC
B) Font.BOLD
C) PLAIN.ITALIC
D) ITALIC

Question 18

Each Swing component is a descendant of a JComponent.

Question 19

If a user enters more characters than specified in a JTextField, the extra characters scroll out of view.

Question 20

What class is the immediate parent of JFrame?

A) Container
B) Component
C) Frame
D) Window

Question 21

When constructing a Font object, which of the following arguments is NOT required?

A) typeface
B) style
C) weight
D) point size

Question 22

A(n) ____________________ consists of a label positioned beside a square; you can click the square to display or remove a check mark.

Question 23

The ____ method of JCheckBox sets the state of the JCheckBox to true for selected or false for unselected.

A) void setSelected(boolean)
B) boolean isSelected()
C) void setText(String)
D) String getText()

Question 24

Which of the following statements will change the value displayed in a JLabel named hello?

A) hello.setText("Hello");
B) setText.hello = "Hello"
C) hello = setText("Hello");
D) setText = hello

Question 25

A(n) ____________________ is the default appearance and behavior of any user interface.

Question 26

A component can be made available or unavailable by passing true or false to the ____ method.

A) getSource()
B) setEnabled()
C) setSelected()
D) setBounds()

Question 27

Swing components are UI elements such as dialog boxes and buttons. You can usually recognize their names because they begin with the letter ____________________.

Question 28

When you create a(n) ____, you can group several components, such as JCheckBoxes, so a user can select only one at a time.

A) CheckGroup
B) ButtonGroup
C) OptionBox
D) OptionGroup

Question 29

The ____ responds to keyboard events.

A) KeyListener
B) ActionListener
C) ChangeListener
D) FocusListener

Question 30

The JButton, JCheckBox, JComboBox, and JRadioButton components are associated with the ____ method.

A) addAdjustmentListener()
B) addChangeListener()
C) addWindowListener()
D) addItemListener()

Question 31

The ____ method of JComboBox returns the maximum number of items the combo box can display without a scroll bar.

A) getSelectedItem()
B) getItemCount()
C) getMaximumRowCount()
D) getSelectedIndex()

Question 32

A ____ is a component that combines two features: a display area showing an option, and a list box containing additional options.

A) JCheckBox
B) JComboBox
C) JButton
D) JTextBox

Question 33

Within an event-driven program, a component on which an event is generated is the ____ of the event.

A) handler
B) driver
C) listener
D) source

Question 34

The ActionListener interface contains the ____ method specification.

A) actionOccurred(Action e)
B) actionPerformed(ActionEvent e)
C) actionEvent(ActionEvent e)
D) action(Event e)

Question 35

A method that executes because it is called automatically when an appropriate event occurs is an event ____.

A) responder
B) listener
C) handler
D) source

Question 36

The ____________________ layout manager places components in a row, and when a row is filled, it automatically spills components into the next row.

Question 37

Which of the following statements will correctly set a JFrame named myFrame to be visible?

A) myFrame.Visible = True
B) myFrame.setVisible(true)
C) myFrame.Visibility.True
D) myFrame.true = Visible

Question 38

In a(n) ____________________ program, the user might initiate any number of events in any order.

Question 39

The ____ responds to keyboard focus events.

A) KeyListener
B) ActionListener
C) ChangeListener
D) FocusListener

Question 40

Within an implementation of the itemStateChanged() method, you can use the ____ method to determine which object generated the event, and the getStateChange() method to determine whether the event was a selection or a deselection.

A) getSource()
B) getEvent()
C) getItem()
D) getState()

Question 41

Match each term with the correct statement below.
a.point size
f.tool tips
b.layout manager
g.heavyweight components
c.lightweight components
h.fonts
d.window decorations
i.event handler
e.editable
Require interaction with the local operating system

Question 42

Describe the FlowLayout manager.

Question 43

Provide an example of an event-driven program.

Question 44

Match each term with the correct statement below.
a.point size
f.tool tips
b.layout manager
g.heavyweight components
c.lightweight components
h.fonts
d.window decorations
i.event handler
e.editable
A class that controls component positioning

Question 45

Match each term with the correct statement below.
a.point size
f.tool tips
b.layout manager
g.heavyweight components
c.lightweight components
h.fonts
d.window decorations
i.event handler
e.editable
A JTextField that has the capability of accepting keystrokes

Question 46

Match each term with the correct statement below.
a.point size
f.tool tips
b.layout manager
g.heavyweight components
c.lightweight components
h.fonts
d.window decorations
i.event handler
e.editable
Popup windows that can help a user understand the purpose of components in an application

Question 47

How have user interface components changed since the early versions of Java?

Question 48

How do you modify whether or not a JTextField can be edited?

Question 49

How do you change the font of a JLabel?

Question 50

Match each term with the correct statement below.
a.point size
f.tool tips
b.layout manager
g.heavyweight components
c.lightweight components
h.fonts
d.window decorations
i.event handler
e.editable
The measurement between lines of text in a single-spaced text document

Question 51

Write the statement to create a JLabel named welcome that holds the words "Welcome Home".

Question 52

Match each term with the correct statement below.
a.point size
f.tool tips
b.layout manager
g.heavyweight components
c.lightweight components
h.fonts
d.window decorations
i.event handler
e.editable
A coffee-cup icon in the frame's title bar, and the Minimize, Restore, and Close buttons

Question 53

How can you customize the appearance of a JFrame?

Question 54

What are some of the decisions you must make when extending a JFrame?

Question 55

What are the four JFrame constructors?

Question 56

How do you change the text of a JLabel? Provide an example.

Question 57

Match each term with the correct statement below.
a.point size
f.tool tips
b.layout manager
g.heavyweight components
c.lightweight components
h.fonts
d.window decorations
i.event handler
e.editable
A method that executes because it is called automatically when an appropriate event occurs

Question 58

Match each term with the correct statement below.
a.point size
f.tool tips
b.layout manager
g.heavyweight components
c.lightweight components
h.fonts
d.window decorations
i.event handler
e.editable
Arial, Century, Monospaced, and Times New Roman

Question 59

What type of method must you implement when you register an event listener?

Question 60

Match each term with the correct statement below.
a.point size
f.tool tips
b.layout manager
g.heavyweight components
c.lightweight components
h.fonts
d.window decorations
i.event handler
e.editable
Are written completely in Java and do not have to rely on the local operating system code

Question 61

import javax.swing.*;
import java.awt.*;
public class JFrame4
{
public static void main(String[] args)
{
final int FRAME_WIDTH = 250;
final int FRAME_HEIGHT = 100;
________________________
JFrame aFrame = new JFrame("Fourth frame");
aFrame.setSize(FRAME_WIDTH, FRAME_HEIGHT); aFrame.setVisible(true);
aFrame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
JLabel greeting = new JLabel("Good day");
________________________
aFrame.add(greeting);
}
}
In the first blank line provided, write the statement to create a Font object named myLook with a typeface of Times New Roman, italic, and 30-point size. In the second blank line, create the statement to apply myLook to the greeting JLabel.

Question 62

Assume you have declared a JFrame named welcomeFrame. Write the statement to set the welcomeFrame object's size to 300 pixels horizontally by 110 pixels vertically. Create a second statement to set the JFrame's title to display the text "My Sized Frame".

Question 63

import javax.swing.*;
public class JFrameLabel
{
public static void main(String[] args)
{
final int FRAME_WIDTH = 300;
final int FRAME_HEIGHT = 120;
JFrame myFrame = new JFrame("Frame with label");
myFrame.setSize(FRAME_WIDTH, FRAME_HEIGHT);
myFrame.setVisible(true);
myFrame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
_________________________
_________________________
}
}
The above code shows an application in which a JFrame is created and its size, visibility, and close operation are set. In the blank lines provided, write the code to create a JLabel named thanks that holds the words "Thank you for your business". Then, write the statement to add the JLabel to the JFrame.

Question 64

Write the statement to clear out a JTextField named myText.

Question 65

import javax.swing.*;
public class JFrameLook
{
public static void main(String[] args)
{
_________________________
JFrame myFrame = new JFrame("Look and Feel");
myFrame.setSize(300, 120);
myFrame.setVisible(true);
}
}
In the shaded line above, write the statement to set the JFrame's look and feel using the setDefaultLookAndFeelDecorated() method.

Question 66

Write the statement to create a layout manager named myLayout that centers components in each row.

Question 67

Write the statement to create a JButton named submitButton with the label "Submit your data".

Question 68

import javax.swing.*;
public class JFrame1
{
public static void main(String[] args)
{
JFrame aFrame = new JFrame("First frame");
aFrame.setSize(300, 125);
aFrame.setVisible(true);
}
}
The three shaded statements in the main() method above are important. Explain the purpose of each statement and why they are necessary for creating a JFrame.

Question 69

Write the code to build a JComboBox named sideDish with no arguments. Then, create the addItem() methods to provide options for "Fries", "Salad", and "Fruit".

Question 70

Write the statement to create a JCheckBox object named feeWaived that is selected. Include the label "Fee Waived".

Question 71

Write the statement to provide a JTextField object named myInfo that allows enough room for a user to enter 15 characters.

Question 72

import javax.swing.*;
import java.awt.*;
public class JFrame6
{
public static void main(String[] args)
{
final int FRAME_WIDTH = 250;
final int FRAME_HEIGHT = 100;
JFrame aFrame = new JFrame("Sixth frame");
aFrame.setSize(FRAME_WIDTH, FRAME_HEIGHT);
aFrame.setVisible(true);
aFrame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
JLabel greeting = new JLabel("Hello");
JLabel greeting2 = new JLabel("Who are you?");
_________________________
aFrame.add(greeting);
aFrame.add(greeting2);
}
}
Using the above code, write the FlowLayout statement in the blank line provided that will display the two greeting JLabels side by side.

Question 73

Create the statements to construct two JFrames. One JFrame should be declared as welcomeFrame and have the title "Welcome", and the second JFrame should be declared as noTitleFrame and have no title.

Question 74

Write the statement to add a tool tip that displays "Submit your form" to a button named submit.