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The primary reason for the deprecation of the Java Applet class is that it is no longer considered a secure way to run code in a web browser. Applets were designed to be a way to run small Java programs within a web page, but over time they became a popular attack vector for hackers to exploit. As a result, web browsers began disabling Java applets by default, and Java itself began phasing them out.

There are several alternatives available to Java applets. One of the most popular is to use JavaScript and HTML5 to run interactive content directly in the browser, without needing a plug-in or separate runtime environment. Other options include developing native mobile apps or using server-side technologies like PHP or Ruby on Rails to build web applications that can be accessed from any device. Additionally, Java developers can take advantage of technologies like JavaFX or Java Web Start to create richer, more interactive applications that can be deployed outside of the browser.