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set up path,classpath in linux(slaware9) for java

i downloaded j2sdk in my linux.dont know how to set up path and classpath in linux.i am using slackware9.please help

Use the search, Luke.

Cheers,
Tink

I'll just paste my answer to a similar question posted on knoppix.net:

Quote:

Sun does not use an open license for Java so it is not included with the official Debian archives, so you can't apt-get install with a stock /etc/sources.list file.

However, the Blackdown project (blackdown.org) provides Java packages for Debian (and many others). These are not very up to date (usually) so I just download the Java SDK (not the JRE!) from Sun and install it.

Here's how you do it:

1. Download the "Linux self-extracting file" package from http://java.sun.com/j2se/1.4.2/download.html

2. Create a directory for Java related stuff under /usr/local:
$ cd /usr/local
$ su (enter password for root, note that the prompt changes when you're root)
# mkdir java
# cd java

3. Then you need to run the file. With this file you can do it like this:
# sh j2sdk-1_4_2_01-linux-i586.bin
....or like this:
# chmod +x j2sdk-1_4_2_01-linux-i586.bin (this makes the file executable)
# /home/hw/downloads/j2sdk-1_4_2_01-linux-i586.bin (execute it - run this from the /usr/local/java directory)

4. Now it's installed. Still, the java and javac commands won't work from the command line because the /bin subdirectory from the SDK isn't in the path. We need to add them somehow. There are many different ways of doing this but this is how I usually do it:
Edit /etc/profile (as root) with your favourite text editor. There should be a line that specifies directories that contain executables and should be added to the PATH environment variable. Something like this:
PATH="/usr/local/bin:/usr/bin:/bin:/usr/bin/X11:/usr/games"
The directories are separated by colons(. Add a colon at the end of the line (but before the closing quote) and add the Java bin directory. If you followed my outline above it should be /usr/local/java/j2sdk1.4.2/bin/.
Now the line looks like this:
PATH="/usr/local/bin:/usr/bin:/bin:/usr/bin/X11:/usr/games:/usr/local/java/j2sdk/bin"
Save the file!

Either log out and log in again or do a "source /etc/profile" to let the changes take effect. Type "javac" at the shell prompt and you should see the exact same thing as you see on Windows!

Quote:

Edit /etc/profile (as root) with your favourite text editor. There should be a line that specifies directories that
contain executables and should be added to
the PATH environment variable.

May I suggest a modification?
If you update the system via CD, you're quite likely
to have a new /etc/profile and need to make
the changes again or merge the two files...
Also, making changes to a central file like
profile isn't necessarily a good idea for n00bs.

I'd suggest making a file
/etc/profile.d/java.sh
and make it look like this :)
(modify to match your paths ;})

Code:

#!/bin/sh

# Add JDK specific settings

export JAVA_HOME=/usr/java

export PATH=$PATH:/usr/java/bin:/usr/java/jre/bin

Cheers,
Tink

or you could edit .bash_profile in your home directory (something like /home/*user*/.bash_profile --when you have to type in the file you want to open, type .bash_profile). and add the line :

:/usr/java/j2sdk1.4.2_01/bin

to the end of your PATH line

i edited the /etc/profile and set the path .javac is now working.