How to find, install and begin
to use the Java programming
A word or two on the history of some old fashion
A small history of Java…
How do I install it on my computer?
How do I use what I just installed?
What we’re going to
A short look at some old school
languages, BASIC, C and C++
It all begins in the sixties…
BASIC stands for Beginner’s All-purpose Symbolic
It was designed in 1963 at Dartmouth college. It was
designed to make it easy for non-technical people to
write computer programs.
BASIC programs were like grocery lists. You told the
program what you wanted to do and it did it in order.
BASIC was Interpreted.
C and C++
Developed in the early seventies, “C” became the
de-facto language for microcomputer
programming in the seventies and eighties.
“C” was not interpreted, it was compiled.
Later, in the early eighties, C++ introduced object
orientation to the C world. Originally called “C
with Classes”, Bjarne Stroustrup developed the
additions to C that, in 1985, became C++.
OO is when programmers try to mimic the real
world more closely and make programs act like
“objects” and not just be grocery lists.
So, what have we learned?
1. BASIC was an interpreted programming language
2. “C” was a compiled programming language
3. “C++” brought object orientation to “C”
Say goodbye to the
welcome to a
short (but hopefully informative)
history of the Java
James Gosling began developing Java beginning
It was first called “Project Green” and ‘Oak”
First developed for remote cable TV boxes
James Naughton creates “HotJava” in 1995. it’s
a web browser that lets you run “Applets”. The
entire browser is written in Java.
In 1998 Java 1.2 is released
Java just released version 1.6 or J2SE 6…
James Gosling Circa 1971
James Gosling Today
High Performance – JIT
Buzzwords glommed from the Core Java 2 book verbatim
Is Java Interpreted or Compiled?
Java programs are compiled to Bytecode
Bytecode is then interpreted by a JVM, or Java Virtual
machine. The virtual machine is what runs your program
It’s the JVM that cares about your Operating system, NOT THE PROGRAM!
WORA - Write Once, Run Anywhere!
Downloading a Java JDK
You want a JDK, not just a JRE
Create a “Temp” directory on your PC or laptop
Go to http://java.sun.com
Go to the “Popular Downloads” section and select “Java SE”
Select a JDK without Netbeans (We’ll talk about this later)
Agree to the accept the use policy
Right Click and Save the Offline Windows JDK to your temp dir
Installing a Java JDK
Go to your “Temp” dir using Windows Explorer
Make sure no other apps are running and double click the install program
you just downloaded. Follow the steps.
I install in C:Java
Watch fom multiple JREs and JDKs! In Windows the Registry runs the
show now, not the JAVA_HOME env variable
Test with a Command Prompt Window and “java –version”
Add C:Java”Java ver”bin to your PATH var
Be sure to add “current directory” to the CLASSPATH (if you had one)
Now, Lets test it
DOS - Command Prompt
Make a directory structure
Type “Edit” and Voila
Test JAVAC and JAVA
Create Bytecode ( the *.class file) with “Javac”
Run Program with “Java”
If we were
Help on the Web
Got an Error?
Just type it verbatim into Google and you usually can find the
answer to your question or solve your problem.
Wikipedia is a good place to get background and history
On anything, and Java is no exception
Java is both compiled and
Java is Object Oriented
http://java.sun.com is Java’s home
You want the Java Development Kit (JDK) , not a JRE or J2EE
Take your time, use temp directories for setup files
Test with a simple “Hello World” after you install
Use the Web for help (Google errors, javaranch, etc.)