Deck 4: Introduction to Graphical Applications

Question 1

Which of the following statements is true?

A) Application class is the superclass, and ShellGraphicsApplication is the subclass.
B) ShellGraphicsApplication is the superclass, and the Application is the subclass.
C) ShellGraphicsApplication is the superclass, and main is the subclass.
D) None of these is correct.

Answer 1

A

Question 2

The stroke and fill methods draw the figures in the ____________ colors.

A) main
B) prominent
C) foreground
D) background

Answer 2

C

Question 3

Graphical applications require a _________ method, which contains the code to execute when the application begins.

A) main
B) paint
C) draw
D) Graphics

Answer 3

A

Question 4

What is the likely cause if a figure is not visible inside a window?

A) The figure's coordinates are outside the bounds of the window.
B) At least one of the (x, y) coordinates is not valid.
C) The paint method was used.
D) The constructor requires a larger window.

Question 5

Gray consists of equal amounts of black and white.

Question 6

A(n) ___________ line is drawn if the startX and endX values are the same.

Question 7

The ______________ class provides the functionality for drawing shapes.

A) IntegerObject
B) paint
C) main
D) GraphicsContext

Question 8

A JavaFX graphical application opens a new window.

Question 9

When using the Color class, you can instantiate 16,000 additional combinations of the component values.

Question 10

The coordinate of the top left corner of the window is (0, 0).

Question 11

Which of the following is the purpose of the fill methods?

A) Render solid figures
B) Render the outline of the figure
C) Draw a rectangle in the background color
D) None of these is correct.

Question 12

JavaFX's GraphicsContex class, in the javafx.scene.canvas package, provides methods to draw figures such as rectangles, circles, and lines; to set the colors for drawing; and to write text in a window.

Question 13

fillRect( double x, double y, double width, double height ) draws a solid rectangle with its top-left corner at (x, y), with the specified width and height in pixels, and returns an int.

Question 14

It is more difficult to draw an octagon than a circle.

Question 15

When drawing a figure, it is useful to specify coordinates as offsets from a starting (x, y) coordinate.

Question 16

What would happens if the (x,y) coordinate you specify for a figure is not inside the window?

A) If a figure's coordinates are outside the bounds of the window, an error will be generated but the figure will be visible.
B) If a figure's coordinates are outside the bounds of the window, an error will be generated and the figure will not be visible.
C) If a figure's coordinates are outside the bounds of the window, no error will be generated, but some of the figure may not be visible.
D) None of these is correct.

Question 17

When drawing a square blue box crisscrossed with a yellow ribbon, you would draw the blue box before the yellow ribbon.

Question 18

An applet viewer, which is provided as part of the Java SE Development Kit (JDK), is a minimal browser that enables us to view the applet without needing to open a web browser.

Question 19

In Java, the __________ keyword specifies that one class is an extension of another and inherits the properties of the other class.

A) application
B) main
C) extends
D) elaborate

Question 20

Which package is the GraphicsContext class part of?

A) javax.swing
B) javafx.swing
C) java.awt
D) javax.awt
E) javafx.scene.canvas

Question 21

Calling the launch method in main automatically triggers a call to the ______ method.

A) init
B) main
C) start
D) exit
E) launch

Question 22

Where is the (0, 0) coordinate in the window?

A) Top left
B) Top right
C) Bottom left
D) Bottom right

Question 23

In horizontal lines, the startX and endX values are the same.

Question 24

strokeOval draws a solid oval.

Question 25

In JavaFX, we draw shapes and text on a(n) ________.

Question 26

If we want to draw a string in a specific font, we can change the font by calling the ________ method.

Question 27

The name of the method you would call to draw a solid square is __________.

Question 28

The name of the method you would call to display a String is __________ and fillText.

Question 29

The name of the method you would call to draw a solid oval is __________.

Question 30

The name of the method you would call to add a line to a polygon is __________.

Question 31

In the method strokeRect( 10, 20, 100, 200 ), 100 and 200 represent __________, respectively, of the rectangle being drawn.

A) the x and y coordinates of the top left corner
B) the x and y coordinates of the bottom right corner
C) the x and y coordinates of the top right corner
D) the width and height
E) the height and the width

Question 32

In the method call strokeRect( 10, 20, 100, 200 ), 10 and 20 represent, __________, respectively, of the rectangle being drawn.

A) the x and y coordinates of the top left corner
B) the x and y coordinates of the bottom right corner
C) the x and y coordinates of the top right corner
D) the width and the height
E) the height and the width

Question 33

The RGB values of Color.GREEN are:

A) 0,128,0.
B) 255,0,0.
C) 0,0,255.
D) 0,0,0.
E) 255,255,255.

Question 34

The RGB values of Color.ORANGE are:

A) 255,0,0.
B) 255,165,0.
C) 255,0,165.
D) 0,0,0.
E) 255,255,165.

Question 35

Using the Color static method rgb( int rr, int gg, int bb ), how many color combinations can you instantiate?

A) 255
B) 380
C) Around 1,000
D) Around 65,000
E) Around 16.7 million

Question 36

JavaFX is the most recent system for building graphical applications using Java.

Question 37

In JavaFX, the stroke and fill colors must always be the same.

Question 38

In JavaFX, once we have set the fill color, we can no longer change it.

Question 39

The strokeLine, strokeRect, and strokeOval methods are all void methods.

Question 40

The strokeText method is a value-returning method.

Question 41

The Color class contains Color constants.

Question 42

Black has RGB values (0, 0, 0).

Question 43

JavaFX uses a mixed performance/art metaphor. We start with a(n) __________ and add one or more scenes to it.

Question 44

To produce graphical output with JavaFX, we draw shapes and text on a(n) __________.

Question 45

In JavaFX, the name of the class that contains methods we can use to draw shapes is __________.

Question 46

The current stroke and fill colors are also called the __________ colors.

Question 47

The names of the methods used to set the current stroke color and current fill color are __________ and setFill, respectively.

Question 48

RGB stands for __________.

Question 49

Compare and contrast standard and graphical applications.

Question 50

How can you draw shapes made of straight lines that are not rectangles?

Question 51

CORAL is a constant of the Color class. How do we use it in a program?

Question 52

How is the strokeOval( double x, double y, double width, double height ) method related to graphical output?

Question 53

Estimate where the point (289, 240) would fall in a rectangle, 300 pixels wide by 250 pixels high.

Question 54

Can a method call using strokeOval( double x, double y, double width, double height ) be used in an expression?

Question 55

How is the clearRect( double x, double y, double width, double height ) method related to graphical output?

Question 56

Identify the programming line needed to print "Roses are red, violets are blue" twice on two different lines if the first line is gc.strokeText( "Roses are red", 140, 100 );.

Question 57

Why do you need to imagine a rectangle bounding all sides of the oval or circle in order to draw the figure?