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Thank you for visiting
this section. Aral Pinoy Section does not promise readers to learn the
full topic. A proper learning methodology like actual classroom / seminar
workshop must be conducted to tackle topics in full.
Aral Pinoy Section will give you only the basics needed to start.
Learn to Program JAVA. Learn the Basics.
by: Rodelio P. Barcenas
JAVA applet programming.
The topic for this session is about how to create JAVA applets, what
it can do? and how does it work?
Let's go back to basics.
To make a computer program for a certain application, we should first
try to consider two different setups
- Compiler
- Interpreters
Compiler. When a programmer starts
to write program for a computer, the programmer will write his program
using text editors or equivalent. The program statements are readable
by a human being. At the end of his program, the programmer then tries
to go to a process of compilation. The first phase of compilation will
be checking the syntax of the program and the second phase will be to
convert the program to a machine code understandable by computers. If
a programmer creates a program in C language called "example.c",
after compilation an excutable machine code file "example.exe"
will then be produced. The file "example.exe" is executeable
and does not need other softwares to run it.
Interpreter. This process does not
include the second phase in compiler. If a programmer created a program
"example2.bas" (Quick Basic), the file will not be converted
into a machine code just like the compiler process. The file "example2.bas"
must be run inside the the Quick Basic environment in order to execute
the program.
A quick glimpse of the Internet development
Everybody is almost aware on how to surf the internet using their browsers
looking for informations in millions of computers around the globe.
The first browser that was developed was the browser called "Mosaic".
The main intention during that time was to share information via the internet
using Text and images only. The browser uses the HTML protocol in which
readers can just click on items needed to explore. HTML (HyperText Markup
Language) is actually a programming language intended just for the browser
technology.
A web browser developer "Netscape" pionered and developed further
the technology in web browser. Netscape later on tried to included the
JAVA (developed by SUN http://www.javasoft.com) interpreter inside the
Web Browser.
Since then, the concepts of using the web browser in sharing information
(text, images) became completely different. The Web browsers now can execute
programs because of the interpreter imbedded inside. The web browsers
now turned into another programming paradigm where complete internet connectivity
can be realized. NASA Space Hubble Telescope is running on a Web Page
and a Web Browser.
The JAVA Applet
The JAVA applet is the program attached to the HTML files. This Applet
is executed by the Web Browsers that has an internal JAVA Virtual Machine
like Netscape, Internet Explorer et al.
~ end ~
Next Session, How to program JAVA applets
RPB
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