Deck 17: Applets, Images, and Sound

Question 1

The ____ command is part of the Java Development Kit (JDK), which provides a convenient environment in which to test your applets.

A) appletview
B) appletviewer
C) viewapplet
D) av

Answer 1

B

Question 2

The name of a called applet must be a compiled Java applet with a .class file extension.

Answer 2

True

Question 3

The GIF image format is more flexible than other formats and uses lossless data compression.

Answer 3

False

Question 4

Because applets execute in a browser, the JApplet class contains methods that are automatically called by the browser.

Question 5

If the JApplet class was not already written, you would have to write more than ____ methods to give your JApplet all the capabilities of the built-in JApplet class.

A) 20
B) 50
C) 200
D) 300

Question 6

The applet can be run within a page on the Internet or an intranet, but you do not have to connect to the Internet to run an applet in your browser-you can simply use the browser locally.

Question 7

What package contains the JApplet class?

A) javax.applet
B) javax.swing
C) java.applet
D) java.swing

Question 8

You save applets with a(n) ____ file extension.

A).java
B).appl
C).applet
D).class

Question 9

Applet code runs in a constrained area called a(n) ____.

A) sandbox
B) toolbox
C) appletview
D) XHTML

Question 10

What is the parent class of JApplet?

A) Container
B) Component
C) Applet
D) Panel

Question 11

____ contains many commands that allow you to format text on a Web page, import graphic images, and link your page to other Web pages.

A) JApplet
B) HTML
C) Swing
D) Applet

Question 12

There are four methods inherited from JApplet that make up the life cycle of an applet.

Question 13

Applets can delete, read, or create files on the user's system.

Question 14

It is common practice for programmers to write their own stop() and destroy() methods.

Question 15

You can run an applet in a ____.

A) main() method
B) Java application
C) Web server
D) Web browser

Question 16

To compile an applet into bytecode, use the ____ command.

A) appletview
B) viewapp
C) javac
D) java

Question 17

You can use an overloaded version of the Image class method drawImage() to output a scaled image.

Question 18

In the JApplet life cycle, a paint() method would always be called before the init() and start() methods.

Question 19

You do not use the java command to execute an applet.

Question 20

The extension of an HTML document should be .html or ____.

A).htm
B).app
C).java
D).class

Question 21

A(n) ___________________ is a likeness of a person or thing.

Question 22

The ____ provides image-manipulation capabilities.

A) Java Speech API
B) Java Media Framework (JMF)
C) Java 3D API
D) Java Advanced Imaging API

Question 23

Which of the following lines of code are used when creating a JApplet using only the init() method?

A) public add.init()
B) public void init()
C) public void start()
D) public new init()

Question 24

If you want to place an image on a button, it is simplest to use the ____ class.

A) Image
B) ImageIcon
C) Sound
D) Graphics

Question 25

By calling ____ in an applet, you get a URL object that represents the folder in which the applet's class file is stored.

A) getFile()
B) getClass()
C) getDocBase()
D) getCodeBase()

Question 26

A(n) ___________________ is a program that is called within another application-often a Web browser.

Question 27

Use the ____ applet method to perform initialization tasks, such as setting variables to initial values or placing applet components on the screen.

A) initialize()
B) begin()
C) init()
D) start()

Question 28

The ___________________ method is always called after the init() and start() methods execute.

Question 29

The ____ method is used to load an Image into the named Image in the applet.

A) get()
B) loadImage()
C) load()
D) getImage()

Question 30

The ____ API allows you to add audio and video media to an application.

A) Java Media Framework (JMF)
B) Java Advanced Imaging
C) Java Speech
D) Java 2D or the Java 3D

Question 31

Which of the following statements will properly code the init() method header?

A) import void init()
B) JApplet void init()
C) JLabel = new init()
D) public void init()

Question 32

The tag that begins every HTML document is ____.

A)

Question 33

You override the existing empty ____ method only if you want to take some action when a JApplet is no longer visible.

A) hide()
B) onHide()
C) destroy()
D) stop()

Question 34

Usually, you place three attributes within the

Question 35

Invoking the ____ method after adding one or more JComponents to an applet ensures that the Components draw themselves on the screen.

A) draw()
B) paint()
C) repaint()
D) validate()

Question 36

When you write your own ____ method, you must include any actions you want your JApplet to take when a user revisits the JApplet.

A) repaint()
B) start()
C) paint()
D) restart()

Question 37

To run an applet from an HTML document, you add an

Question 38

___________________ is a Swing class from which you can inherit to create your own applet.

Question 39

Which of the following cannot be performed with JApplets?

A) Use layout managers.
B) Add images and sounds.
C) Use a flow() method for layout.
D) Change label fonts/colors.

Question 40

With an applet, the browser can call ____ different methods automatically at different times.

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

Question 41

What are the four steps involved in creating an applet?

Question 42

What are the three object tag attributes commonly used to run an applet?

Question 43

How do you view an applet?

Question 44

How is an applet like a Java application?

Question 45

Match each term with the correct statement below.
a.current version of HTML
f.tags
b.init()
g.multimedia
c.start()
h.applet
d.HTML
i.play()
e.Applet Viewer
Executes again every time the applet becomes active after it has been inactive

Question 46

Explain lossless data compression and the image formats with which it is used.

Question 47

Match each term with the correct statement below.
a.current version of HTML
f.tags
b.init()
g.multimedia
c.start()
h.applet
d.HTML
i.play()
e.Applet Viewer
Describes the use of sound, images, graphics, and video in computer programs

Question 48

Match each term with the correct statement below.
a.current version of HTML
f.tags
b.init()
g.multimedia
c.start()
h.applet
d.HTML
i.play()
e.Applet Viewer
Retrieves and plays the sound as soon as possible after it is called

Question 49

Briefly describe the image formats that Java supports.

Question 50

How is an applet different from a Java application?

Question 51

Match each term with the correct statement below.
a.current version of HTML
f.tags
b.init()
g.multimedia
c.start()
h.applet
d.HTML
i.play()
e.Applet Viewer
Provides a convenient environment in which to test your applets

Question 52

Match each term with the correct statement below.
a.current version of HTML
f.tags
b.init()
g.multimedia
c.start()
h.applet
d.HTML
i.play()
e.Applet Viewer
Surrounded by angle brackets

Question 53

What are the two forms of the play() method?

Question 54

Match each term with the correct statement below.
a.current version of HTML
f.tags
b.init()
g.multimedia
c.start()
h.applet
d.HTML
i.play()
e.Applet Viewer
A simple language used to create Web pages for the Internet

Question 55

Match each term with the correct statement below.
a.current version of HTML
f.tags
b.init()
g.multimedia
c.start()
h.applet
d.HTML
i.play()
e.Applet Viewer
The first method called in any applet

Question 56

Describe the two methods for running an applet.

Question 57

Describe the stop() method.

Question 58

What are the methods of the applet life cycle?

Question 59

Match each term with the correct statement below.
a.current version of HTML
f.tags
b.init()
g.multimedia
c.start()
h.applet
d.HTML
i.play()
e.Applet Viewer
A little application

Question 60

Match each term with the correct statement below.
a.current version of HTML
f.tags
b.init()
g.multimedia
c.start()
h.applet
d.HTML
i.play()
e.Applet Viewer
Extensible Hypertext Markup Language

Question 61

Write the statement to retrieve and play the myTune.au sound file that will be stored in the same place as the applet.

Question 62

There are three attributes typically placed within the

Question 63

public void actionPerformed(ActionEvent e)
{
String name = answer.getText();
con.remove(greeting);
con.remove(pressMe);
con.remove(answer);
personalGreeting.setText("Hello, " + name + "! ");
con.add(personalGreeting);
con.setBackground(Color.PINK);
validate();
}
In the actionPerformed() method above, the final statement following the addition of the JLabel is validate(). Explain the validate() method and how it is used with JComponents.

Question 64

In order to play sounds more than once, or to stop and start sounds, the sound must be loaded into an AudioClip object. Write the statement to load the AudioClip named myClip with the sound file myTune.au, which is located in the audio folder.

Question 65

Using the above statement, identify the three object tag attributes and their corresponding arguments.

Question 66

____________________


Using the HTML code above, write the statement to run a JApplet named JHello. The applet will be 450 pixels wide by 150 pixels tall.

Question 67

import java.awt.*;
import java.applet.*;
import javax.swing.*;
public class JSound extends JApplet
{
AudioClip sound;
public void init()
{
sound = getAudioClip(getCodeBase(),"mysteryTune.au");
}
public void start()
{
___________________________________
}
public void stop()
{
___________________________________
}
public void paint(Graphics g)
{
super.paint(g);
Graphics2D g2D = (Graphics2D)g;
g2D.drawString("Listen to the mystery tune ", 10, 10);
}
}
In the first shaded line provided, write the loop() method to play the mysteryTune.au sound continually. On the second shaded line, write the stop() method to halt the mysteryTune.au sound file.

Question 68

import javax.swing.*;
import java.awt.*;
public class JHello extends JApplet
{
JLabel greeting = new JLabel("Hello. Who are you?");
public void init()
{
add(greeting);
}
}
The above code displays an applet with a JLabel added without a specified BorderLayout region. Describe how the JLabel will occupy the JApplet surface.

Question 69

arrowPicture.paintIcon(this, g, 150, 0);
The statement above is used to display the arrowPicture ImageIcon using the paintIcon() method. Describe the four arguments that are used in this method.

Question 70

import java.awt.*;
import java.applet.*;
import javax.swing.*;
public class JCompanyImage extends JApplet
{
Image companyLogo;
final int WIDTH = 287;
final int HEIGHT = 129;
final int FACTOR = 2;
public void init()
{
companyLogo = getImage(getCodeBase(), "CompanyLogo. png");
}
public void paint(Graphics g)
{
super.paint(g);
// Draw image at its natural size
___________________________________
// Draw the image scaled - twice as large
___________________________________
}
}
Using the above code, complete the first shaded line with the statement to draw the image first in its original size in the upper-left corner. In the second shaded line, write the code to redraw the image at twice its original size using the WIDTH, HEIGHT, and FACTOR values.

Question 71

The init() method is the first method called in any applet. Write the code for the init() method header and explain the purpose of the init() method.

Question 72

____________________________


In the blank line provided, write the code to run a JApplet named JGreeting that will be 370 pixels wide by 110 pixels tall.