How to create a jar file as a library in java?

Question

Let me put it simple: rb.java is already put under /home/jiane/rb/rb.java;
the tar file rb.tar being located under /mylib/rbcore/, the test client is put under /home/jiane/test.java. now rb.java looks like
//// rb.java
import java.until.*;
public class rb {
%>jar cvf /mylib/rbcore/rb.jar /home/jiane/rb.class
test.java as below
//// test.java
import mylib.rbcore.*;
import java.until.*;
class test {
%>export CLASSPATH="/mylib/rbcore/rb.jar;."
%>javac test.java
%>test.java:1 package mylib.rbcore does not exist
so, how to make adjustment to rb.java & test.java so that I can make use of jar file rb.jar. please shows the steps to do. thanks a lot.

Answer 1

import mylib.rbcore.*;This assumes the package mylib.rbcore and imports all its classes.
But the source of the class does contain package statement, so the class is in the default package.