The Java compiler (javac) and runtime (java) use the CLASSPATH
environment variable to find external libraries, which are stored in files with
the extension .jar (Java archive). You need to set the CLASSPATH
environment variable to point to the Processing libraries.
After you extract the Processing application, you should drag it to the Applications folder in Finder.
The path to the folder with the Processing libraries (.jar files) will then be:
/Applications/Processing.app/Contents/Java/core/library
You can set the CLASSPATH on the command line. You can put the current
directory (.) in the CLASSPATH ahead of everything else, so your local
classes are found first.
export CLASSPATH=".:/Applications/Processing.app/Contents/Java/core/library/*"
If you are using an IDE, you will want to set the CLASSPATH in the project or
application settings. If you are running your programs from the command line,
you will want to include the above export line in a script (e.g. your
.profile or .bash_profile file).
After you extract the Processing application, find the extracted folder. If it’s in your Downloads directory, you might want to drag it to the Desktop or a folder where your other applications are located.
The path to the folder with the Processing libraries (.jar files) will then
be something like:
C:\Users\YourName\Desktop\processing_????\core\library
You want to edit the Environment Variables in the Control Panel. You can create a new
variable named CLASSPATH with a value of something like:
.;%UserProfile%\Desktop\processing_????\core\library
Note: %UserProfile% is an environment variable set to your home directory
(C:\Users\YourName). Also, on Windows, paths are delimited by semi-colons
(;) and the path separator is a backslash (\).
If you are using an IDE, you will want to set the CLASSPATH in the project or
application settings, though this may be set from the system environment.
Like OSX, you can set CLASSPATH on the command line to point to where you
have Processing installed:
export CLASSPATH=".:$HOME/path/to/processing_????/core/library/*"
If you are using an IDE, you will want to set the CLASSPATH in the project or
application settings. If you are running your programs from the command line,
you will want to include the above export line in a script (e.g. your
.profile or .bash_profile file).