1. JAVA, JAVA Applets, and JavaScript
Prof. Hele Mai Haav:
CIUE, Fall*2000
JAVA, JAVA Applets, and JavaScript

2. Java, Java Applets
The Java programming language is developed by Sun Microsystems. Bill Joy planted the seeds of Java in 1990.
Main features:
Network based
Platform independent
Syntax is based on C++ ( C++ minus minus as said by James Gosling)

3. Java virtual Machine environment
Source Code
Byte Code
Unix PC
Mac

4. A Java applet is a compiled Java program, composed of classes just like any Java program.
The Java compiler does not directly translate the Java source code into binary code but into so called Java byte code. This byte code is platform independent and can be executed without modification on all platforms that support Java.
A Java interpreter developed for a particular platform is used to execute the byte-code on the target platform.
A so-called Java Virtual Machine is used to execute the Java byte-code on the target platform.

5. Java applications and applets
Java Virtual Machine
Windows
Intel
Sparc
PowerPC
NetworkC
Solaris
MacOS
JavaOS

6. The basic principle of Java
WWW Server
Java enabled WWW browser
HTML page
Java Byte-code
Java Compiler
Java Source code
Java Virtual Machine
Byte code interpreter
Network
HTML data
HTML
Applet
Java Applet

7. JavaScript
JavaScript is Netscape's cross-platform, object-based scripting language for client and server applications.
Using JavaScript you can create dynamic Web pages.
Java is not JavaScript!

8. JavaScript HTML tags for JavaScript An example: <SCRIPT>
function update (Form) {
alert ("form being updated" }
</SCRIPT>

9. JavaScript To learn more about JavaScript see or
Find there free resource of "Cut&Paste" examples of Java scripts for your web pages.
You find JavaScript Guide at