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<html xmlns="http://www.w3.org/1999/xhtml"><head><title>Chapter 23. Applets</title><link rel="stylesheet" href="core.css" type="text/css"/><meta name="generator" content="DocBook XSL Stylesheets V1.74.0"/></head><body><div class="chapter" title="Chapter 23. Applets"><div class="titlepage"><div><div><h1 class="title"><a id="learnjava3-CHP-23"/>Chapter 23. Applets</h1></div></div></div><p>One of the original promises of Java was that applications could be
delivered over the network to your computer as needed. Instead of the old
days of buying a shrink-wrapped box containing a word processor, installing
it, and upgrading it every few years, it would now be possible to obtain and
use software directly from the Internet, safely and on any platform. Today,
we take networked distribution of software for granted. Mobile devices have
driven the advent of app stores for installed software, and many (if not the
majority) of the most highly used applications are now purely browser-based.
Unfortunately for Java fans, these advances took different paths, arguably
less elegant, than the Java platform offered and took longer to arrive than
they likely could have.</p><p>This chapter is about the <span class="emphasis"><em>applet</em></span> API, which was
Java’s earliest mechanism for delivering applications to the web browser.
Applets are not widely used today, but they are part of the vernacular and
are still doing well in some niches. While you may not wish to write applets
going forward, it is useful to understand their basic functionality. As we
review applets, we will also touch on general areas of interest along the
way, such as the Java security model.</p><p>An applet is a Java program that runs within the context of a web
page. Like an image or hyperlink, it “owns” some rectangular area of the
user’s screen. When the web browser loads a page that contains a Java
applet, it knows how to load the classes of the applet and run them. This
chapter describes how applets work and how they are incorporated into web
pages. We’ll also talk about the Java Plug-in and related technologies such
as Java Web Start briefly.</p></div></body></html>