53511273-40131913-Java-Applets - Applets Applets An applet...

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Applets
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Applets An applet is a Panel that allows interaction with a Java program A applet is typically embedded in a Web page and can be run from a browser You need special HTML in the Web page to tell the browser about the applet For security reasons, applets run in a sandbox : they have no access to the client’s file system
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Applet Support Most modern browsers support Java 1.4 if they have the appropriate plugin In the PC labs, Internet Explorer 5.5 has been updated, but Netscape has not The best support isn't a browser, but the standalone program appletviewer In general you should try to write applets that can be run with any browser
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What an applet is You write an applet by extending the class Applet Applet is just a class like any other; you can even use it in applications if you want When you write an applet, you are only writing part of a program The browser supplies the main method
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The genealogy of Applet java.lang.Object    |    +----java.awt.Component            |            +----java.awt.Container                    |                    +----java.awt.Panel                            |                            +----java.applet.Applet
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The simplest possible applet import java.applet.Applet; public class TrivialApplet extends Applet { } <applet     code="TrivialApplet.class”     width=150 height=100> </applet> TrivialApplet.java TrivialApplet.html
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The simplest reasonable applet import java.awt.*; import java.applet.Applet;
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53511273-40131913-Java-Applets - Applets Applets An applet...

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