Deck 15: Advanced Gui Topics

Question 1

A ____ is placed at the top of a container and contains user options.

A) glass pane
B) menu bar
C) content pane
D) containment hierarchy

Answer 1

B

Question 2

What is the parent class of JPanel?

A) Object
B) Component
C) JComponent
D) Container

Answer 2

C

Question 3

Use the ____ layout manager when you need to add components that are displayed one at a time.

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

Answer 3

D

Question 4

When you create a simple scroll pane using the constructor that takes no arguments, horizontal and vertical scroll bars appear only if they are needed.

Question 5

With ____, a redrawn JPanel is displayed only when it is complete; this provides the viewer with updated screens that do not flicker while being redrawn.

A) single buffering
B) double buffering
C) auto filtering
D) double framing

Question 6

If you do not specify alignment, Components are right-aligned in a FlowLayout Container by default.

Question 7

The following statement produces a dark purple color that has green and blue components, but no red:
Color darkPurple = new Color(100, 0, 100);

Question 8

When components in a Swing UI require more display area than they have been allocated, you can use a ____ container to hold the components and allow the user to display the components using scroll bars.

A) JScrollingPane
B) ScrollLayout
C) JPanel
D) JScrollPane

Question 9

A common mistake when using BorderLayout is to add a Component to a content pane or frame without naming a region, resulting in some of the components not being visible.

Question 10

The FlowLayout class contains ____ constants you can use to align Components with a Container.

A) two
B) three
C) five
D) six

Question 11

The Color class contains ____ predefined color constants.

A) 7
B) 12
C) 13
D) 15

Question 12

The wildcard in the import java.awt.* statement imports all types in the java.awt package, including java.awt.Color and java.awt.Font.

Question 13

Java automatically converts the add(), remove(), and setLayoutManager() statements to more complete versions that include _____.

A) getContentPane()
B) glassPane()
C) getJFrame()
D) addAll()

Question 14

Layout managers are interface classes that align components to prevent crowding or overlapping.

Question 15

You use FlowLayout when you want fixed rows and columns of components, and when you want the components to fill available space.

Question 16

An additional layered pane exists above the root pane, but it is not often used explicitly by Java programmers.

Question 17

Use the ____ layout manager when you add components to a maximum of five sections.

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

Question 18

Any component you place on the screen has a vertical, or x-axis, position as well as a horizontal, or y-axis, position in the window.

Question 19

With GridLayout, you can specify the number of rows only; you can use ____ for the number of columns and let the layout manager determine the number of columns.

A) null
B) 0
C) 99
D) -1

Question 20

When you use BorderLayout, you are required to add components into each of the five regions.

Question 21

Each JMenu can contain options, called JMenuItems, or can contain submenus that are ____.

A) JMenuBars
B) JMenuChildren
C) JSubMenus
D) JMenus

Question 22

A(n) ____________________ is a plain, borderless surface that can hold lightweight UI components.

Question 23

You use the getModifiers() method with an InputEvent object, and you can assign the return value to a(n) ____ variable.

A) String
B) boolean
C) int
D) double

Question 24

____________________ are lists of user options; they are commonly added features in GUI programs.

Question 25

Which of the following statements will set the background color of a button named stop to a color of red?

A) stop.setBackground(Color.RED);
B) stop.Backcolor = RED;
C) red.setBackground(Color.RED);
D) setBack.stop.Color.RED;

Question 26

Which of the following is NOT a method of the KeyListener interface?

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

Question 27

Clicking a component results in a(n) ____.

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

Question 28

The ____________________ manager is the default manager class for all content panes.

Question 29

The parent class for all event objects is named ____, which descends from the Object class.

A) EventObject
B) Event
C) ParentEvent
D) AWTEvent

Question 30

The focusGained(FocusEvent) handler is defined in the ____ interface.

A) FocusListener
B) ComponentListener
C) AdjustmentListener
D) ActionListener

Question 31

When you type "A", two ____ key codes are generated: Shift and "a".

A) action
B) virtual
C) event
D) default

Question 32

A(n) ____ implements all methods in an interface and provides an empty body for each method.

A) action key
B) viewport
C) mnemonic
D) adapter class

Question 33

Which of the following statements will correctly add a JMenuBar named myBar to a JFrame?

A) myBar = setJMenuBar
B) setJMenuBar(myBar)
C) JMenuBar.setJMenuBar(myBar)
D) JMenuBar = new JMenuBar(myBar)

Question 34

If you wanted to see the x-coordinate of a user click, you would use the ____ method of the MouseEvent class.

A) getClick()
B) getX()
C) getY()
D) getHoriz()

Question 35

A(n) _________________________ is a tree of components that has a top-level container as its root (that is, at its uppermost level).

Question 36

The parent class of MouseEvent is ____.

A) AWTEvent
B) EventObject
C) InputEvent
D) UserEvent

Question 37

The state of a JCheckBoxMenuItem or JRadioButtonMenuItem can be determined with the ____ method.

A) state()
B) getState()
C) getSelected()
D) isSelected()

Question 38

Clicking an item in a list box results in a(n) ____.

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

Question 39

You use the ____________________ interface when you are interested in actions the user initiates from the keyboard.

Question 40

The JMenus are added to the JMenuBar using the ____ method.

A) addMenu()
B) add()
C) addNewMenu()
D) setMenu()

Question 41

When do you need to worry about using the getContentPane() method?

Question 42

How would you arrange columns into equal rows and columns? Provide an example.

Question 43

Match each term with the correct statement below.
a.GridBagLayout
f.action key
b.JScrollPane
g.Color class
c.JPanel
h.MouseEvent
d.glass pane
i.preferred size
e.GridLayout
A type of event generated by mouse manipulation

Question 44

Match each term with the correct statement below.
a.GridBagLayout
f.action key
b.JScrollPane
g.Color class
c.JPanel
h.MouseEvent
d.glass pane
i.preferred size
e.GridLayout
Use this class to greatly increase the number of possible component arrangements

Question 45

What is an adapter class?

Question 46

What are the four methods defined in the Component class for adding event listeners?

Question 47

Match each term with the correct statement below.
a.GridBagLayout
f.action key
b.JScrollPane
g.Color class
c.JPanel
h.MouseEvent
d.glass pane
i.preferred size
e.GridLayout
Use when you need to set size, placement, and alignment constraints for every component that you add

Question 48

Match each term with the correct statement below.
a.GridBagLayout
f.action key
b.JScrollPane
g.Color class
c.JPanel
h.MouseEvent
d.glass pane
i.preferred size
e.GridLayout
Allows the user to scroll initially invisible parts of the pane into view

Question 49

Describe the difference between an ActionEvent and a MouseEvent.

Question 50

How do you find the red, green, and blue components of a color?

Question 51

Describe the way in which components expand to fill their layout areas in FlowLayout and BorderLayout.

Question 52

Write the statement to create a Color object named myGray with red, green, and blue values of 100 each.

Question 53

Describe the two CardLayout constructors.

Question 54

To force the display of a scroll bar, you can use class variables defined in the ScrollPaneConstants class. What are they?

Question 55

Match each term with the correct statement below.
a.GridBagLayout
f.action key
b.JScrollPane
g.Color class
c.JPanel
h.MouseEvent
d.glass pane
i.preferred size
e.GridLayout
Use when you need to add components into a grid of rows and columns; each component is the same size

Question 56

Match each term with the correct statement below.
a.GridBagLayout
f.action key
b.JScrollPane
g.Color class
c.JPanel
h.MouseEvent
d.glass pane
i.preferred size
e.GridLayout
Resides above the content pane

Question 57

Match each term with the correct statement below.
a.GridBagLayout
f.action key
b.JScrollPane
g.Color class
c.JPanel
h.MouseEvent
d.glass pane
i.preferred size
e.GridLayout
The default size of a component

Question 58

Match each term with the correct statement below.
a.GridBagLayout
f.action key
b.JScrollPane
g.Color class
c.JPanel
h.MouseEvent
d.glass pane
i.preferred size
e.GridLayout
Can be used with the setBackground() and setForeground() methods of the Component class

Question 59

What is a mnemonic? Provide an example of adding a mnemonic.

Question 60

Match each term with the correct statement below.
a.GridBagLayout
f.action key
b.JScrollPane
g.Color class
c.JPanel
h.MouseEvent
d.glass pane
i.preferred size
e.GridLayout
A key that does not generate a character, such as a function key

Question 61

Write the code to create a scroll pane named myScroll that will display an image named scenery with a vertical scroll bar always present and a horizontal scroll bar as needed.

Question 62

import javax.swing.*;
import java.awt.*;
public class JDemoGridLayout extends JFrame
{
private JButton b1 = new JButton("Button 1");
private JButton b2 = new JButton("Button 2");
private JButton b3 = new JButton("Button 3");
private JButton b4 = new JButton("Button 4");
private JButton b5 = new JButton("Button 5");
____________________________________________
private Container con = getContentPane();
public JDemoGridLayout()
{
con.setLayout(layout);
con.add(b1);
con.add(b2);
con.add(b3);
con.add(b4);
con.add(b5);
setSize(200, 200);
}
public static void main(String[] args)
{
JDemoGridLayout frame = new JDemoGridLayout();
frame.setVisible(true);
}
}
Using the above code, write the statement in the shaded line provided to establish a GridLayout with three horizontal rows and two vertical columns, with horizontal and vertical gaps of five pixels each.

Question 63

Write the statement to set the background color of a button named goBtn to a color of green.

Question 64

Write the statement to establish a GridLayout with three horizontal rows and six vertical columns in a Container named myGrid.

Question 65

import java.awt.*;
import javax.swing.*;
import java.awt.Color;
public class Checkerboard extends JFrame
{
private final int ROWS = 8;
private final int COLS = 8;
private final int GAP = 2;
private final int NUM = ROWS * COLS;
private int x;
private JPanel pane = new JPanel
(new GridLayout(ROWS, COLS, GAP, GAP));
private JPanel[] panel = new JPanel[NUM];
private Color color1 = Color.WHITE;
private Color color2 = Color.BLUE;
private Color tempColor;
public Checkerboard()
{
super("Checkerboard");
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
add(pane);
for(x = 0; x < NUM; ++x)
{
panel[x] = new JPanel();
pane.add(panel[x]);
if(x % COLS == 0)
{
tempColor = color1;
color1 = color2;
color2 = tempColor;
}
if(x % 2 == 0)
panel[x].setBackground(color1);
else
panel[x].setBackground(color2);
}
}
public static void main(String[] args)
{
Checkerboard frame = new Checkerboard();
final int SIZE = 300;
frame.setSize(SIZE, SIZE);
frame.setVisible(true);
}
}
The above code creates a loop to fill even-positioned squares with one color and odd-positioned squares with another color, resulting in a checkerboard pattern. Describe how JPanels and a GridLayout are used to achieve this effect.

Question 66

import javax.swing.*;
import java.awt.*;
public class JDemoBorderLayout extends JFrame
{
private JButton nb = new JButton("North Button");
private JButton sb = new JButton("South Button");
private JButton eb = new JButton("East Button");
private JButton wb = new JButton("West Button");
private JButton cb = new JButton("Center Button");
private Container con = getContentPane();
public JDemoBorderLayout()
{
con.setLayout(new BorderLayout());
_________________________________________
_________________________________________
_________________________________________
_________________________________________
_________________________________________
setSize(400, 150);
}
public static void main(String[] args)
{
JDemoBorderLayout frame = new JDemoBorderLayout();
frame.setVisible(true);
}
}
Using the above code, write the statements in the shaded lines provided to add components to each of the five regions (north, south, east, west and center).

Question 67

List and describe the four constructors that can be used when creating a JPanel object.

Question 68

Using a FlowLayout object named myLayout, write the statement to set the layout of a content pane to left.

Question 69

import java.awt.*;
import javax.swing.*;
import java.awt.Color;
public class JFrameWithColor extends JFrame
{
private final int SIZE = 180;
private Container con = getContentPane();
private JButton button =
new JButton("Press Me");
public JFrameWithColor()
{
super("Frame");
setSize(SIZE, SIZE);
con.setLayout(new FlowLayout());
con.add(button);
_____________________________________
_____________________________________
_____________________________________
}
public static void main(String[] args)
{
JFrameWithColor frame =
new JFrameWithColor();
frame.setVisible(true);
}
}
In the first shaded line provided, write the statement to set the background color of the JFrame's content pane to gray. Using the remaining two shaded lines, write the statements to set the JButton foreground color to white and the background color to blue.