Importing a class in a project

Hi. I wrote a class I would like to use in many projects. I've never had such a need, so I don't know whether it is possible or not to import it or not. I would like to place this class in a directory, and leave it there. Then, when writing some other classes in which I need that one, is it possible to import it without having to place it in the same directory every time?
Thanks for any hint.

I can't understand what I'm doing wrong. I created the jar file. Every class inside the jar has a line with inside:
package os;in the dir where I have all the classes which are inside the jar file everything seems to compile ok:
javac *.javaThen, I created the jar, and tried this:
javac -jar jarfile.jar ClassName.javabut this parameter -jar doesn't exist. Then, from manual, I saw this parameter and tried:
javac -classpath jarfile.jar ClassName.javabut I get this error:
ClassName.java:1: package os does not exist
import os.*;
^
oslib.jar(Semaphore.java):15: class Semaphore is public, should be declared in a file named Semaphore.java
(source unavailable)
ClassName.java:7: cannot access Semaphore
bad class file: oslib.jar(Semaphore.java)
file does not contain class Semaphore
Please remove or make sure it appears in the correct subdirectory of the classpath.
Semaphore s = null;
^
3 errorswhere oslib is jarfile, Semaphore is a class inside the jarfile and os is the package name I used.
Do you know what could I've been done wrong?
Many thanks for yuor help.

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