Deck 14: Introduction to Swing Components

Question 1

Which statements create a JLabel that holds the words "Happy birthday"  and adds the greeting to a JFrame object named aGreeting ?

A) JLabel mygreeting = aFrame.add(mygreeting); new JLabel( "Happy Brithday");
B) JLabel mygreeting = new Frame( "Happy Brithday");
C) JLabel("Happy Brithday");  aGreeting.add(Label);
D) JLabel mygreeting = new JLabel("Happy Birthday"); aGreeting.add(mygreeting);

Answer 1

D

Question 2

Each Swing component is a descendant of a JComponent .

Answer 2

True

Question 3

What class is the immediate parent of JFrame ?

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

Answer 3

C

Question 4

A ____ is a Component used to trigger an action or make a selection when the user clicks it.

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

Question 5

You can use the setEnabled() method to make a component available or unavailable by passing true or false to it.

Question 6

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 7

Which method do you use to assign a font object to a JLabel ?

A) setFont()
B) fontLabel()
C) assignFont()
D) JLabel.font()

Question 8

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

Question 9

If a user enters more characters than specified in a JTextField , the extra characters are deleted.

Question 10

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

Question 11

You cannot change the font of strings displayed in GUI components.

Question 12

Which constructor constructs a new JTextField with the specified text and columns?

A) public JTextField(String text)
B) public JTextField(int columns, String text )
C) public JTextField(String text, int columns)
D) public JTextField(String text, int columns, int location)

Question 13

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

Question 14

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

Question 15

Which method overrides the default behavior for the JFrame to be positioned in the upper-left corner of the computer screen's desktop?

A) setSize()
B) title()
C) setBounds()
D) isResizable()

Question 16

What is the default layout manager for JFrame ?

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

Question 17

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

Question 18

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 19

What is the immediate parent class of JTextField ?

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

Question 20

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

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

Question 23

A ____ is a component that combines a button or an editable field and a drop-down list.

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

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

Look and feel comprises the elements of design, style, and ____ in any user interface.

A) font faces
B) functionality
C) logistics
D) syntactic sugar

Question 26

The ____ responds to keyboard events.

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

Question 27

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

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

Question 28

The ____ responds to keyboard focus events.

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

Question 29

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

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

Question 30

Which method sets the state of the JCheckBox to true for selected or false for unselected?

A) isSelected
B) getSelected
C) setSelected
D) setState

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 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 33

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 34

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 35

Which method do you use to change the state of a JCheckBox ?

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

Question 36

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

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

Question 37

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

A) the letter S
B) Swing
C) the letter J
D) UI

Question 38

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

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

Question 39

The ActionListener interface contains the ____ method specification.

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

Question 40

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 43

How do you change the font of a JLabel ?

Question 45

What are the four JFrame constructors?

Question 50

How are computer programs more user friendly when they contain GUI components? How does Java address GUI components?

Question 55

How can you customize the appearance of a JFrame ?

Question 57

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

Question 61

Create the statements to construct two JFrame s. 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 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 JFrame1
{
     public static void main(String[] args)
     {
         JFrame aFrame = new JFrame("First frame");
         aFrame.setSize(300, 125);
         aFrame.setVisible(true);
     }
}
Explain the purpose of each statement in the main() method above and why they are necessary for creating a JFrame .

Question 64

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?");
     -----Code here-----
     aFrame.add(greeting);
     aFrame.add(greeting2);
   }
}
Using the above code, write the FlowLayout statement in the indicated line that will display the two greeting JLabel s side by side.

Question 65

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

Question 66

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

Question 67

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

Question 68

What are the tasks you must perform when you declare a class that handles an event?

Question 69

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

Question 70

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 71

Provide an example of an event-driven program.

Question 72

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

Question 73

Describe a flow layout manager compared to a border layout manager.

Question 74

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

Question 75

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

Question 76

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);
       -----Code here-----
       -----Code here-----
     }
}
The above code shows an application in which a JFrame is created and its size, visibility, and close operation are set. In the indicated 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 77

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

Question 78

Write the statement to clear out a JTextField named myText .

Question 79

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;
      -----Code here-----
      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");
      -----Code here-----
      aFrame.add(greeting);
   }
}
In the first indicated line, 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 indicated line, create the statement to apply myLook to the greeting JLabel .