Question 1

Applet restrictions are:

Accepted Answer

Applet restrictions are necessary to prevent malicious code from attacking or spying on unsuspecting users. These restrictions are enforced by the Java security manager and are independent of the web browser. In Java 7, the security restrictions have been tightened and made more customizable, but they are still necessary for security reasons. The applet can be run locally or on a web server, but the restrictions still apply.

Question 2

________ is the language that Web pages are written in.

Accepted Answer

HTML (Hypertext Markup Language) is the standard language used for creating web pages, defining the structure and content of the page. PHP, XML, and JavaScript are all programming languages used for web development, but they are not the primary language used for creating the structure of web pages.

Question 3

In the link produced by the following HTML, what word would you click to go to the linked location? Click here to learn more about applications.

Accepted Answer

The link is on the word "applications", so clicking on that word will take you to the linked location (http://www.applications.com).

Question 4

When the applet viewer opens an HTML document with more than one applet tag:

Accepted Answer

The applet viewer creates a separate window for each applet tag found in the HTML document, allowing each applet to run independently.

Question 5

Look at the following applet code:
1 import javax.swing.*;
2 import java.awt.*;
3 public class GraphicsTest extends JApplet
4 {
5 public void init()
6 {
7 getContentPane().setBackground(Color.WHITE);
8 }
9 public void paint(Graphics g)
10 {
11 int[] xCoords = {20, 20, 60, 100, 140, 140, 100, 60};
12 int[] ycoords = {20, 100, 140, 140, 100, 60, 20, 20};
13 super.paint(g);
14 g.setColor(Color.YELLOW);
15 g.fillPolygon(xCoords, yCoords, 8);
16 g.setColor(color.BLACK);
17 g.setFont(new Font("SansSerif", Font.BOLD, 35));
18 g.drawString("SLOW", 35, 95);
19 }
20 }
What is the color of the polygon?

Accepted Answer

The color of the polygon is set to yellow with the method call g.setColor(Color.YELLOW) on line 14.

Question 6

Which of the following will load the applet, TestApplet?

Accepted Answer

The correct syntax for loading an applet is:

Question 7

Which of the following is NOT a valid AWT class?

Accepted Answer

JMenu is a class from the Swing framework, not from AWT. The other three options are valid AWT classes.

Question 8

Which tag will produce largest text?

Accepted Answer

The <h1> tag is the largest heading tag in HTML and is used for main headings.

Question 9

What does the tag <p /> cause to happen?

Accepted Answer

The tag

creates a paragraph break which is displayed as a blank space between paragraphs in HTML.

Question 10

When someone visits a Web page containing a Java applet:

Accepted Answer

When someone visits a Web page containing a Java applet, the applet is downloaded to the visitor's browser and executed. The applet runs within the security sandbox of the browser, which ensures that the applet cannot access resources or execute code that is not explicitly allowed by the user. The applet is not executed on the server, nor does it use resources from other visitors' browsers. The visitor's browser does not act as a server for hosting the applet.

Question 11

An HTML document is usually saved with what file name extension?

Accepted Answer

An HTML document is most commonly saved with a .html file name extension. This file extension allows the document to be recognized and properly displayed as a web page in a browser. Choosing A, B, or C as the file name extension would result in an error or unexpected behavior when trying to view the document as a web page.

Question 12

Look at the following applet code:
1 import javax.swing.*;
2 import java.awt.*;
3 public class GraphicsTest extends JApplet
4 {
5 public void init()
6 {
7 getContentPane().setBackground(Color.WHITE);
8 }
9 public void paint(Graphics g)
10 {
11 int[] xCoords = {20, 20, 60, 100, 140, 140, 100, 60};
12 int[] ycoords = {20, 100, 140, 140, 100, 60, 20, 20};
13 super.paint(g);
14 g.setColor(Color.YELLOW);
15 g.fillPolygon(xCoords, yCoords, 8);
16 g.setColor(color.BLACK);
17 g.setFont(new Font("SansSerif", Font.BOLD, 35));
18 g.drawString("SLOW", 35, 95);
19 }
20 }
How many vertices does the polygon have?

Accepted Answer

The polygon has 8 vertices as specified by the arrays xCoords and yCoords, each containing 8 coordinates.

Question 13

In the following code, which line has an error?
1 public class TestApplet extends JApplet
2 {
3 public void init()
4 {
5 super.JApplet();
6 JLabel label = new JLabel("Test label");
7 setLayout(new FlowLayout());
8 add(label);
9 }
10 }

Accepted Answer

The error is on line 5. The syntax for calling a parent's constructor using "super" does not include the class name. It should simply be "super();".

Question 14

Look at the following applet code. 1 import javax.swing.*;
2 import java.awt.*;
3 public class GraphicsTest extends JApplet
4 {
5 public void init()
6 {
7 getContentPane().setBackground(Color.WHITE);
8 }
9 public void paint(Graphics g)
10 {
11 int[] xCoords = {20, 20, 60, 100, 140, 140, 100, 60};
12 int[] ycoords = {20, 100, 140, 140, 100, 60, 20, 20};
13 super.paint(g);
14 g.setColor(Color.YELLOW);
15 g.fillPolygon(xCoords, yCoords, 8);
16 g.setColor(color.BLACK);
17 g.setFont(new Font("SansSerif", Font.BOLD, 35));
18 g.drawString("SLOW", 35, 95);
19 }
20 }
What will be the coordinates of the third point of the polygon?

Accepted Answer

The third point of the polygon is (60, 140). This can be seen from the array of x-coordinates and y-coordinates. The third element of the x-coordinates array is 60, and the third element of the y-coordinates array is 140.

Question 15

An applet using a Swing GUI extends which class?

Accepted Answer

An applet using a Swing GUI extends the JApplet class, which is a subclass of Applet and provides additional capabilities specific to Swing components. Choices C and D are not valid options for extending Swing components, and while extending the base Applet class (choice A) is possible, it is not preferred for Swing-based applets.

Question 16

If a frame component is 200 pixels wide and 300 pixels high, the lower, left-hand corner has (X, Y) coordinates of:

Accepted Answer

The answer of If a frame component is 200 pixels...

Question 17

Applets are important because the can be used to:

Accepted Answer

Applets are small programs that can be embedded within a web page to add additional functionality, such as interactive features or animations. They allow web developers to extend the capabilities of a web page beyond the static content that is typically provided by HTML and CSS. Options B, C, and D are not accurate descriptions of the typical use of applets.

Question 18

In an HTML document, the tags:

Accepted Answer

HTML tags are used to structure content and instruct the web browser on how to display or format the text, as well as where to place images and what actions to take when a user interacts with certain elements, such as clicking on a link. Therefore, all the statements in the options accurately describe the function of HTML tags in a document.

Question 19

Which of the following is NOT a restriction placed on applets?

Accepted Answer

Applets are not allowed to create windows or graphics on the user's system. However, they can display graphics within a web page using the Graphics class. The other restrictions listed in the options are valid for applets.

Question 20

Due to security restrictions, applets cannot:

Accepted Answer

Applets are restricted by the Java Virtual Machine (JVM) from performing actions that could potentially cause harm or compromise the security of the user's system. This includes deleting files, reading the contents of files, and creating files on the user's system. Therefore, all of the given choices are not allowed for applets.

Quiz 14: Applets and More