PreAP Computer Science- 6.4-9 Quiz
.html
An applet is a Java program that is designed to execute inside a web page. In order for this to work, you need a _____ file.
Paint
Applets do not have the main method. What do they have instead?
Whenever you create an applet in jGRASP, it creates the necessary HTML file for you.
Consider programs ExpoMethods01.java and ExpoMethods02.java. These are applets. How were we able to execute these programs from jGRASP without the special file mentioned in question
Yes
Does the order of the parameters matter?
Pixels
Graphics images are not solid picture, but images created with hundreds or thousands of colored dots. What are these individual graphics dots called?
You have two radii; horizontal radius, vertical radius
How is an oval different from a circle?
36
How many colors are built into the Expo class?
Applet Viewer
IDEs like jGRASP and jCreator have the ability to execute applets using a special program called ____________, which is part of the JDK.
fillArc
If you want to draw PAC-MAN, what method would you use?
fillRectangle, fillCircle, fillOval
If you want to draw solid rectangles, circles and ovals what methods would you use?
In the same folder/directory as the .java file that calls the Expo class methods
In order to use the Expo class, the file Expo.java must be located where?
g
In the Expo class, what is the first parameter of any method that does anything graphical?
No
Is the Expo class part of the Java programming language?
They represent the upper-left-hand coordinate (X1,Y1) and the lower-right-hand coordinate (X2,Y2)
Like drawLine, drawRectangle requires that you also specify 2 coordinate points. What do they represent?
(0,0) coordinate is located in the top-left-hand corner of the graphics window in CGS; Y coordinate values begave differently in CGS- increase from top down to bottom
List 2 differences between a Cartesian graph and a computer graphics screen.
Starting degree value, stopping degree value
The first 5 parameters of drawArc are identical to drawOval. drawArc adds 2 more parameters at the end. What do these 2 parameters specify?
The first two integers represent the starting coordinate while the last two specify the ending coordinate.
The parameters of drawLine include 4 int value which are for 2 coordinate points. In terms of drawing the line, what do these points represent?
Awt, applet libraries
What 2 libraries must be imported in order for graphics applets to work?
setColor
What Expo method lets you change colors?
Hyper Text Markup Language
What does .html stand for?
Abstract Windows Tools
What does awt stand for?
Expo.html
What file contains reference information for the Expo class?
The small shape will not be visible
What happens when a small shape is drawn on top of large shape that is the same color?
an oval
What is an arc a piece of?
Black
What is the default drawing color?
drawPixel only draws one pixel, while drawPoint draws a 3 by 3 "square" of 9 pixels
What is the difference between drawPixel and drawPoint?
A set of points in a plane that are equidistant from a given point.
What is the mathematical definition of a circle?
The information about the location or coordinates for the picture.
What is the minimum requirement of any call to a graphics method?
Cartesian Coordinate System
What is the name of the coordinate system that has 4 quadrants and the point (0,0) in the center?
The distance from the center of the circle to any point on the edge of the circle itself
What is the radius of a circle?
Main
What method is always found in an application?
g, X coordinate of center, Y coordinate of center, radius
What parameters are necessary for drawCircle?
The X and Y value of the pixel/point
What parameters are required by both drawPixel and drawPoint?
Circle
When using drawOval, what will the output look like if the horizontal radius is equal to the vertical radius?
Short, fat oval
When using drawOval, what will the output look like if the horizontal radius is greater than the vertical radius?
Tall, thin oval
When using drawOval, what will the output look like if the horizontal radius is less than the vertical radius?
Many browsers no longer execute Java applets for security reasons
When you try to execute a Java applet in a web browser, it may still be blocked, even if you "Allow" it. Why is that?
drawPixel, drawPoint, drawLine
Which 3 draw methods do not have corresponding fill methods?
Graphics
Which type of method has more parameters: Math methods or graphics methods?
it is automatically erased
what happens to the file (something .html) when jgrasp is closed?
