Podcast
Questions and Answers
What is the primary language used to write an applet?
What is the primary language used to write an applet?
What is the purpose of the init() method in an applet?
What is the purpose of the init() method in an applet?
What is the primary advantage of using an applet?
What is the primary advantage of using an applet?
What is the purpose of the sandboxed environment in which an applet runs?
What is the purpose of the sandboxed environment in which an applet runs?
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What is the correct order of an applet's life cycle?
What is the correct order of an applet's life cycle?
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What is a major disadvantage of using an applet?
What is a major disadvantage of using an applet?
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What is the purpose of the stop() method in an applet?
What is the purpose of the stop() method in an applet?
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What has largely replaced applets in modern web development?
What has largely replaced applets in modern web development?
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What is a characteristic of an applet?
What is a characteristic of an applet?
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Study Notes
Applet
Definition
- A small program that runs on a web page, typically used to add interactive features to a website
- Written in Java, compiled, and executed on the client-side (web browser)
Characteristics
- Has a graphical user interface (GUI)
- Can respond to user input (e.g., mouse clicks, keyboard input)
- Can communicate with the web server that hosts the applet
- Runs in a sandboxed environment, restricting access to the local file system and network connections
Life Cycle of an Applet
- Loading: The applet is downloaded from the web server and loaded into the browser.
-
Initialization: The applet is initialized, and its
init()method is called. -
Start: The applet's
start()method is called, and the applet begins executing. - Running: The applet runs, responding to user input and updating the GUI as needed.
-
Stop: The applet's
stop()method is called, and the applet is paused. -
Destroy: The applet is unloaded from the browser, and its
destroy()method is called.
Advantages
- Can provide a rich, interactive user experience
- Can be used to create games, simulations, and other interactive tools
- Can be easily distributed and updated
Disadvantages
- Requires a Java Runtime Environment (JRE) to be installed on the client-side
- Can be a security risk if not properly sandboxed
- Has largely been replaced by other technologies such as JavaScript and HTML5
Definition of an Applet
- A small program designed to run within a web page, enhancing interactivity.
- Developed in Java, it is compiled and executed in the client-side environment of web browsers.
Characteristics of Applets
- Features a graphical user interface (GUI) that supports visual interaction.
- Capable of responding to various user inputs, including mouse and keyboard actions.
- Communicates with the hosting web server, allowing for data exchange.
- Operates within a sandboxed environment, limiting access to local files and network elements for security.
Life Cycle of an Applet
- Loading: The applet is downloaded from the server and integrated into the browser.
-
Initialization: The applet undergoes initialization with the invocation of the
init()method. -
Start: Execution begins through the calling of the
start()method. - Running: The applet actively responds to user interactions while updating its GUI.
-
Stop: The
stop()method is called, causing the applet to pause operations. -
Destroy: The applet is removed from the browser environment, concluding with the
destroy()method.
Advantages of Applets
- Delivers a compelling, interactive user experience suitable for various applications.
- Useful for developing games, simulations, and interactive tools with rich functionality.
- Offers simple distribution and update mechanisms, enhancing accessibility for users.
Disadvantages of Applets
- Depends on the presence of a Java Runtime Environment (JRE) on client devices.
- Potential security vulnerabilities if sandbox restrictions aren't effectively enforced.
- Has been overshadowed by newer technologies like JavaScript and HTML5, limiting relevance.
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Description
Test your knowledge about Java Applets, a small program that runs on a web page, adding interactive features to a website.
