How do I setup and modify CLASSPATH on my mac (shell or eclipse)?

How can I setup and modify CLASSPATH on my mac (shell or eclipse)? I wrote a class about certain kind of function to simplified "System.out.p开发者_如何转开发rint()",and I want to import the class in other packages. To achieve the import, should I set up the CLASSPATH on my mac? (I use eclipse in mac OSX 10.6.6)

You can update your ~/.profile to set your CLASSPATH. Check out this post for more info...