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Chapter 17: Problem 13

Which method returns URL of the directory which contains an applet? a. getDirectory0 b. getCodeBase() c. getURLO d. None of the above

Short Answer

Expert verified
Option b: getCodeBase()

Step by step solution

01

- Understand the question

The problem asks for the method that returns the URL of the directory which contains an applet.
02

- Review the options

Options given: a. getDirectory0 b. getCodeBase() c. getURLO d. None of the above
03

- Identify the correct method

Out of the given options, determine which method is used in applets to return the URL containing the applet.
04

- Evaluate each option

a. getDirectory0 - This is not a valid method in context. b. getCodeBase() - This method returns the URL of the directory that contains the applet. c. getURLO - This is not a valid method. d. None of the above - Since getCodeBase() is a valid method, this option is incorrect.
05

- Conclude the correct answer

From the evaluation, it is clear that getCodeBase() is the correct method.

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Key Concepts

These are the key concepts you need to understand to accurately answer the question.

getCodeBase method
One of the key functions in Java applet programming is the `getCodeBase` method. This method is essential as it returns the URL of the directory that contains the applet.

When an applet is executed within a webpage, it often needs to access other resources such as images, files, or additional classes. The `getCodeBase` method helps achieve this by providing a means to get the base URL of the applet's code directory.

Here's why `getCodeBase` is useful:
  • Allows easy loading of resources relative to the applet's location.
  • Enables applet to interact dynamically with varying resources via URL.
  • Facilitates content and file management within Java applet projects.
This method plays a crucial role in the resource management of Java applets, ensuring the applet can access its required files effectively.
URL retrieval in applets
In Java applet programming, retrieving URLs is a frequent necessity for various tasks. Applets often load images, sound files, or connect to networks, and performing these actions requires using URLs.

To retrieve a URL in an applet, several methods are commonly utilized:
  • `getCodeBase()`: Retrieves the URL of the directory containing the applet.
  • `getDocumentBase()`: Retrieves the URL of the document containing the applet.
  • `new URL(String)`: Creates a URL from a specified string.
Using these methods, an applet can dynamically interact with resources and web pages. For example, an applet may need to load an image file located in the same directory as the applet; it can use `getCodeBase` to form the complete URL and then fetch the image.

Understanding URL retrieval mechanisms ensures that applets can efficiently handle external resources and provide a seamless user experience.
Java applet programming
Java applet programming was a popular way to create interactive and dynamic content on web pages. Applets are small Java programs that run within a web browser. Here鈥檚 a brief overview of Java applet programming:

  • **Lifecycle Methods**: Key lifecycle methods include `init()`, `start()`, `stop()`, and `destroy()`. These methods help in managing the applet's life cycle, from initialization to termination.
  • **Displaying Content**: Applets use the `paint(Graphics g)` method for rendering visuals on the screen. This allows drawing shapes, text, and images.
  • **Handling Events**: Applets can respond to user actions like mouse clicks and keypresses by implementing event listeners.
Despite their historical significance, modern web development has largely moved away from applets due to security concerns and the advent of more robust technologies like HTML5 and JavaScript. However, understanding applet programming provides valuable insights into early web interactivity and Java鈥檚 capabilities.

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Most popular questions from this chapter

What method applets use to receive strings from html files? a. getValue 0 b. getParameter() c. \(\operatorname{get}()\) d. None of the above

Can applet tag appear inside JApplet class? a. Yes b. No c. Yes-but as a comment statement only d. None of the above

Which class fires ActionEvent at periodic intervals? a. JButton b. JMenu c. swing. Timer d. util.Timer e. None of the above

Which of the following are true about JApplet? a. JApplet is a small program that can be embedded into html files b. JApplet extends awt.Applet class c. JApplet contains content pane to hold swing components d. All of the above

How many param tags can applet tag have? a. 1 b. 2 c. 3 d. Any number of tags
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