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Installing the JDK

As of November 2012, you will find installation instructions at (External Link) .

I strongly recommend that you read the instructions and pay particular attention to theinformation having to do with setting the path environment variable.

A word of caution

If you happen to be running Windows Vista or Windows 7, you may need to use something like the following when updating the PATH Environment Variable

... ;C:\Program Files (x86)\Java\jdk1.6.0_26\bin

in place of

... ;C:\Program Files\Java\jdk1.7.0\bin

as shown in the installation instructions.

I don't have any experience with any Linux version. Therefore, I don't have any hints to offer there.

The JDK documentation

It is very difficult to program in Java without access to the documentation for the JDK.

Several different types of Java documentation are available online at (External Link) .

Specific documentation for classes, methods, etc., is available online at (External Link) .

It is also possible to download the documentation and install it locally if you have room on your disk. The download links for JDK 6 and JDK 7 documentationare also shown on the page at (External Link) .

You may also want to search for and use the documentation for the latest version of the JDK.

Compiling and running Java code

There are a variety of ways to compile and run Java code. The way that I will describe here is the most basic and, in my opinion, the most reliable. These instructionsapply to a Windows operating system. If you are using a different operating system, you will need to translate the instructions to your operating system.

Write your Java program

Begin by using your text editor to write your Java program into one or more text files, each with an extension of.java. (Files of this type are often referred to as source code files.) Save the source code files in an empty folder somewhere on your disk. Make sure that thename of the class containing the main method (which you will learn about in a future module) matches the name of the file in which that class is contained (except for the extension of .java on the file name, which does not appear in the class name) .

Create a batch file

Use your text editor to create a batch file (or whatever the equivalent is for your operating system) containing the text shown in Listing 1 (with the modifications discussed below) and store it in the same folder as your Java source code files..

Then execute the batch file, which in turn will execute the program if there are no compilation errors.

Listing 1 . Windows batch file.
echo off clsdel *.class javac -cp .; hello.javajava -cp .; hello pause

Comments regarding the batch file

The commands in the batch file of Listing 1 will

  • Open a command-line screen for the folder containing the batch file.
  • Delete all of the compiled class files from the folder. (If the folder doesn't contain any class files, this will be indicated on the command-linescreen.)
  • Attempt to compile the program in the file named hello.java.
  • Attempt to run the compiled program using a compiled Java file named hello.class .
  • Pause and wait for you to dismiss the command-line screen by pressing a key on the keyboard.

Questions & Answers

what does nano mean?
Anassong Reply
nano basically means 10^(-9). nanometer is a unit to measure length.
do you think it's worthwhile in the long term to study the effects and possibilities of nanotechnology on viral treatment?
Damian Reply
absolutely yes
how to know photocatalytic properties of tio2 nanoparticles...what to do now
Akash Reply
it is a goid question and i want to know the answer as well
characteristics of micro business
for teaching engĺish at school how nano technology help us
Do somebody tell me a best nano engineering book for beginners?
s. Reply
what is fullerene does it is used to make bukky balls
Devang Reply
are you nano engineer ?
fullerene is a bucky ball aka Carbon 60 molecule. It was name by the architect Fuller. He design the geodesic dome. it resembles a soccer ball.
what is the actual application of fullerenes nowadays?
That is a great question Damian. best way to answer that question is to Google it. there are hundreds of applications for buck minister fullerenes, from medical to aerospace. you can also find plenty of research papers that will give you great detail on the potential applications of fullerenes.
what is the Synthesis, properties,and applications of carbon nano chemistry
Abhijith Reply
Mostly, they use nano carbon for electronics and for materials to be strengthened.
is Bucky paper clear?
so some one know about replacing silicon atom with phosphorous in semiconductors device?
s. Reply
Yeah, it is a pain to say the least. You basically have to heat the substarte up to around 1000 degrees celcius then pass phosphene gas over top of it, which is explosive and toxic by the way, under very low pressure.
Do you know which machine is used to that process?
how to fabricate graphene ink ?
for screen printed electrodes ?
What is lattice structure?
s. Reply
of graphene you mean?
or in general
in general
Graphene has a hexagonal structure
On having this app for quite a bit time, Haven't realised there's a chat room in it.
what is biological synthesis of nanoparticles
Sanket Reply
what's the easiest and fastest way to the synthesize AgNP?
Damian Reply
types of nano material
abeetha Reply
I start with an easy one. carbon nanotubes woven into a long filament like a string
many many of nanotubes
what is the k.e before it land
what is the function of carbon nanotubes?
I'm interested in nanotube
what is nanomaterials​ and their applications of sensors.
Ramkumar Reply
what is nano technology
Sravani Reply
what is system testing?
preparation of nanomaterial
Victor Reply
how did you get the value of 2000N.What calculations are needed to arrive at it
Smarajit Reply
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