Chapter 18

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Chapter 18

Applets

This activity contains 15 questions.

A URL (Uniform Resource Locator):

is a web address - it specifies where information can be found on the Web
always begins with http://
usually begins with a specification of what "protocol" is to be used to access the referenced information - like ftp, http, etc.
may refer to a file on your computer just as easily as a file somewhere on the Web

True: (a), (b), (d)True: (a), (c), (d)True: (c), (d)True: (a), (d)

Consider the following code fragment found within an applet:

JLabel jLabel = new JLabel( );
ImageIcon imageIcon = new ImageIcon("image.txt");
jLabel.setIcon(imageIcon);

This code is attempting to add an image to the applet; but it will fail during compilation due to a syntax errorNone of the above alternatives is trueThis code is attempting to add an image to the applet; but it will fail during execution because the new JLabel line is in the wrong placeThis code is attempting to add an image to the applet; but it will fail during execution because images aren't stored in .txt files

How does the content pane within a JApplet differ from that found within a JFrame?

You may have several content panes in a JFrame, but only a single one in a JAppletThe amount of information you can add to a JFrame content pane is unlimited, but it is limited in the JApplet caseThere's no difference - the content panes are the sameThe way you add information to a JFrame's content pane uses slightly different methods than you do when adding information to a JApplet's content pane

HTML is:

a language for creating documents that will be displayed using a web browser
used to create web pages, most of which do not utilize applets
a specialized part of the Java language
a programming language with much the same power as Java or C++

Correct: (a), (b), (d)Correct: (a), (b)Correct: All of the aboveCorrect: (a), (b), (c)

If your computer has several JVM's (Java Virtual Machines) installed, which of the following is (are) true?

Only the most recent JVM will be used for running an applet that is specified in a page viewed by your browser when it's looking at a web page on the Word Wide Web
Your browser will use the JVM that came with your Java development environment to view such pages
Your browser will use it's own JVM to view such pages
You can specify which JVM is to be used to view such pages

True: (a)True: (c), (d)True: (b), (d)True: Only (c)

In HTML a link (or hyperlink):

provides a way to link to a document on your own computer
provides a way to link to a document on a computer on the World Wide Web
provides a way to link to several documents within a single link
usually will be highlighted by a browser that is displaying it

True: (b), (d)True: (a), (d)True: All of the aboveTrue: (a), (b), (d)

What restrictions are imposed on img= tags that are different from those imposed on href= tags?

href= tags only can be used with applets; this is not true for img= tagsThere are no differences in restrictionsimg= tags refer to files containing images, while href= tags refer to files containing HTMLimg= tags only can be used with applets; this is not true for href= tags

What statement(s) is (are) true about HTML comments?

An HTML comment must begin with /* and end with */, just like Java
An HTML comment may begin with //, and extend to the end-of-line, just like Java
An HTML comment may be "nested" - i.e., it may contain another comment within itself
An HTML comment ends with />, just like end paragraph, end HTML, end BODY, etc.

True: (a), (b), (d)True: All of the aboveTrue: (c), (d)True: None of the above

Which of the following is (are) true?

HTML is a case-sensitive language
HTML is a whitespace insensitive language
HTML commands all are "delimited" - they have a start command and a corresponding end command (denoted by </ command>)
HTML files should be named using a .htm or .html suffix

True: All of the aboveTrue: (a), (c), (d)True: (a), (b), (d)True: (b), (d)

Which of the following statement(s) are true about convering a Swing application into a JApplet:

The main method should be removed; the constructor(s) should be replaced by a parameterless init method with much the same contents
You must remove all calls to super, setDefaultCloseOperation, and setTitle
You should delete all calls to setSize
You should replace extends JFrame with extends JApplet

True: All of the aboveTrue: All but (d)True: All but (c)True: All but (b)

Which statement(s) is (are) true about Applets and JApplets?

They normally require HTML to launch them
They have their size controlled by HTML, rather than via a setSize method call
They usually require a setDefaultCloseOperation method call
They can be run just using the AppletViewer program to launch them

True: (a), (b), (d)True: All of the aboveTrue: (b), (d)True: (a), (c), (d)

Which statement(s) is (are) true about applets?

Applets are designed so that they cannot (or cannot easily) run applications on your computer
Applets cannot read files from your computer's hard drive
Applets cannot write files to your computer's hard drive
Applets cannot (or cannot easily) corrupt your computer's operating system

True: All of the aboveTrue: (a), (d)True: All but (d)True: All but (c)

Which statement(s) is (are) true about menus in JApplets?

The methods used for adding menus to JApplets are the same as those for adding menus to JFrames
The methods used for adding sub-menus to JApplets differ slightly from those for adding sub-menus to JFrames
The setJMenuBar method functions the same way in both JApplets and JFrames
You must add menus to the content pane or to a panel that is part of the JApplet if you wish to make use of menus

True: (a), (d)True: (b), (c), (d)True: (a), (c), (d)True: All of the above

Which statement(s) is (are) true?

A web page that is missing its initial HTML or its final /HTML tag will not display correctly
A web page that has no TITLE tag will not be able to be "bookmarked"
The ADDRESS portion of a web page does not display
Text specified with H2 always is larger than text specified with H1

True: None of the aboveTrue: (a), (b), (c)True: All of the aboveTrue: (a), (c)

Which statement(s) is (are) true?

HTML must include an applet tag if it is to run an applet
An applet tag must have at least code=, height=, width= in order to be correct
There may be only a single applet tag in an HTML page
An applet tag only needs to have code= in order to specify which applet is to be run - the height=, width= are optional

True: (a), (d)True: (a), (c)True: (a), (b), (c)True: (a), (b)

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So, the Submit Answers for Grading button below will not work.

The following Submit Answers for Grading button is provided in its place and will clear your answers:
The Clear Answers and Start Over feature requires scripting to function. Your browser either does not support scripting or you have turned scripting off.

So, the Clear Answers and Start Over button below will not work.

The following Clear Answers button is provided in its place and will clear your answers:

Your browser either does not support scripting or you have turned scripting off. Because of this, the answer choices will NOT appear in a different order each time the page is loaded, though that is mentioned below. Note that you do not need this feature to use this site.

Answer choices in this exercise appear in a different order each time the page is loaded.

Chapter 18

Consider the following code fragment found within an applet: JLabel jLabel = new JLabel( ); ImageIcon imageIcon = new ImageIcon("image.txt"); jLabel.setIcon(imageIcon);

How does the content pane within a JApplet differ from that found within a JFrame?

HTML is: a language for creating documents that will be displayed using a web browser used to create web pages, most of which do not utilize applets a specialized part of the Java language a programming language with much the same power as Java or C++

What restrictions are imposed on img= tags that are different from those imposed on href= tags?

Consider the following code fragment found within an applet:
JLabel jLabel = new JLabel( ); ImageIcon imageIcon = new ImageIcon("image.txt"); jLabel.setIcon(imageIcon);

HTML is:

a language for creating documents that will be displayed using a web browser
used to create web pages, most of which do not utilize applets
a specialized part of the Java language
a programming language with much the same power as Java or C++