Introduction to Java Applets

Java programming language

Distributive, interpreted, multithreaded, portable, object-oriented program

Java Applet

Small Java program that works within browsers

How Applets work

Java Source code --> Bytecode (.class files) --> JVM (Java Virtual Machine)

Adding Applets to web pages

Sample code: (Parade Ground)

<applet code="pmvr.class" width=400 height=250>
<param name="image" value="main2b.jpg">
<param name="view" value="360">
<param name="pixdeg" value="0=250,906=90,2010=250">
<param name="center" value="906">
<param name="auto" value="1">
</applet>

<applet code="FloorPlan.class" name="FloorPlan" width=376 height=250>
<param name="image" value="Summerall3.gif">
<param name="x" value="190">
<param name="y" value="132">
</applet>

<APPLET> tag

The attributes are CODE, CODEBASE, HEIGHT, WIDTH, NAME, ALIGN

The last 4 work as with an <img> tag. The only required attribute is the CODE - it names the class file to be used by the applet. The CODEBASE specifies the URL (or path) to the class file if not in the same directory as the HTML doc or on another computer.

<PARAM> tag

These tags control the way an applet works. They set the parameters of an appplet using NAME, VALUE pairs.

Examples

Samples from text: clocks, animation, scrolling text

CSCI 217 Course Home page banner

Panorama applets with hotspots, audio, and pop-ups

HotMedia object movie and mathematical algorithm

GSP Isomorphism demo

Where to find applets

See links on Course reference page

Applet development Tools