What Java Applet

In this article, I will provide you with a detailed explanation of what a Java applet is and how it works. As a software developer with a passion for Java programming, I have had the opportunity to work with Java applets extensively throughout my career. So, let’s dive deep into the world of Java applets!

Introduction to Java Applets

A Java applet is a small program that is written in the Java programming language and embedded within a web page. It is designed to be executed by a web browser with a Java Virtual Machine (JVM) installed. Java applets were quite popular in the early days of the internet when web technologies were still evolving.

One of the key advantages of Java applets is their ability to provide rich and interactive content within a web page. They can be used to create games, interactive simulations, data visualizations, and more. Java applets are platform-independent, meaning they can run on any operating system that has a compatible Java Virtual Machine.

How Java Applets Work

When a web page containing a Java applet is loaded in a web browser, the browser downloads the applet’s bytecode from the web server. The bytecode is a compiled version of the Java source code that can be executed by the Java Virtual Machine. Once the bytecode is downloaded, the JVM starts running the applet.

Java applets run inside a sandboxed environment, which means they have limited access to the user’s system resources. This is done to ensure the security of the user’s computer. The applet can interact with the web page it is embedded in, but it cannot access files or network resources outside of its sandbox.

Java applets are typically embedded in a web page using the <applet> tag. The tag specifies the location of the applet’s bytecode file, as well as other attributes such as width, height, and parameters that can be passed to the applet.

Personal Touch

As a developer, I have fond memories of working on Java applets. They allowed me to create interactive and visually appealing content that could be accessed directly from a web browser. I remember spending hours tweaking the applet’s code to achieve the desired functionality and user experience.

However, over time, the popularity of Java applets has declined. This is mainly due to the rise of other web technologies, such as JavaScript and HTML5, which provide similar capabilities without the need for a Java plugin. As a result, many modern web browsers have dropped support for Java applets.


In conclusion, Java applets were once a popular method for embedding interactive content within web pages. They provided a way to bring Java’s powerful features to the web. However, with the advancement of other web technologies, Java applets have become less common. Despite their declining popularity, Java applets still hold a special place in the history of web development.