Hi Arun
The question was about a "javac file not found" error. There is no need
to know anything about classpath to avoid this error.
The PATH system variable normally contains a list of directories where
the operating system (OS) looks for files when the explicit path is not
specified. For e.g. when you type "ipconfig" at the Windows/DOS command
prompt, it executes the file "C:\Windows\system32\ipconfig.exe" because
the directory "C:\Windows\system32" is listed in the %PATH%. In the same
way, most of Unix/Linux/OS-X commands are executable binary files that
exist in "/usr/bin" and "/user/bin" is listed in the $PATH.
The CLASSPATH system variable contains a list of directories where Java
looks for files (namely packages and their contained classes). Instead
of creating a CLASSPATH variable, there are other ways to specify the
list of directories, such as using the "-cp" option for the java or
javac command. There are several long discussions about the CLASSPATH,
look for answers containing "classpath" in the subject around the 30th
ot the 31st of August.
If you wish, you may put that in this way:
-- The OS is a "program", executed by the machine. In order to find the
files it needs (when the place is not explicitly specified), there are
some "default" places to look for. The "default" places are contained in
the PATH (system variable).
-- The Java virtual machine (JVM) is a "program", executed by the OS. In
order to ind the files it needs (when they are not in the current
directory), there are some "default" places to look for. The "default"
places are contained in the CLASSPATH.
Now:
-- In order to let the OS to find javac, its directory has to be listed
in the PATH system variable, unless you explicitly specify its full
pahtname.
-- In order to let javac to find the packages that contains the classes
referenced by the code to compile, their directories must be listed in
the CLASSPATH system variable (or the equivalent information is passed
by "-cp"), unless they are in the current directory (the "." is usually
the default value for the classpath).
So:
-- In order to be able to execute (start) "javac", all you have to think
about is PATH.
-- In order to make it working (compiling), you might need to think to
CLASSPATH too.
Hope it helps
Mihai
Le 19/09/2010 08:40, Arun Kumar a écrit :
Dear mihai
Do u know about classpath. In below solution u are not mention
classpath concept.
Why.
With regards
Arun Kumar
On Tue, Sep 14, 2010 at 2:13 AM, Mihai DINCA <mihai.di...@free.fr
<mailto:mihai.di...@free.fr>> wrote:
Hi Sathvavathi,
If you use some integrated programming environment like Eclipse or
NetBeans, it takes care about the location of the *javac*
compiler. But if you try to executed it by hand, be sure it is in
the PATH.
For e.g., under Windows, if your JDK is installed in "*C:\Program
Files\myJavaSDK*", probably the *javac.exe* is in "*C:\Program
Files\myJavaSDK\bin*". In this case, do create in the current
directory the file "*/setenv.bat/*":
*> notepad setenv.bat
*
with the following content:
*SET JAVAHOME=C:\Program Files\myJavaSDK
SET PATH="%JAVAHOME%\bin";%PATH%*
(please notice the double quotes " - mandatory if your JAVAHOME
contains any white space).
Then execute first /*setenv.bat*/:
*> setenv*
and compile using javac only after.
The same thing applies if you are trying to compile on GNU Linux
or Unix. Let's say that your *javac* compiler is in
"*/usr/local/java files/bin*". In this case, do create in the
current directory the file "/*sentenv.sh*/":
*> kate setenv.sh
*
(your currently installed editor must be different from /kate/)
with the following content:
*export JAVAHOME=/usr/local/java\ files*
*export PATH=$JAVAHOME/bin:$PATH*
(there is no quote, but exotic characters, such as the space, must
be preceded by the escape character "*\*"; other differences: the
separator character in the PATH is the colon "*:*" instead of the
semicolon "*;*" and the environment variables are prefixed by
"*$*" instead of being surrounded by "*%*").
Then execute first /*setenv.sh*/:
*> chmod a+x setenv.sh
> ./setenv.sh*
and compile using javac only after.
Hope it helps
Mihai
Le 13/09/2010 09:27, Sathyavathi Sekar a écrit :
--- On *Sun, 9/12/10, Sathyavathi Sekar
/<sathyavathi_sr...@yahoo.com>
<mailto:sathyavathi_sr...@yahoo.com>/* wrote:
From: Sathyavathi Sekar <sathyavathi_sr...@yahoo.com>
<mailto:sathyavathi_sr...@yahoo.com>
Subject:
To: javaprogrammingwithpassion@googlegroups.com
<mailto:javaprogrammingwithpassion@googlegroups.com>
Date: Sunday, September 12, 2010, 10:25 PM
hi i am new to java programming .in the command prompt,i am
getting error as javac file cannot be found or the or
thesystem cannot find the path specified. what should i do?
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