Re: Why Doesn't my Code Work with this Jar File?

I'm having a nasty time figuring out how to use JAR files. I have a
directory "Jrs" that includes an "abc" directory and a "def"
directory. In directory "abc" I have a single file called
"AbcCl.java" coded:

package abc;
public class AbcCl
{
   public String toString ()
   {
     return "[AbcCl Object]";
   }
}

and in directory "def" I have a single file called "DefCl.java" coded:

package def;
public class DefCl
{
   public String toString ()
   {
     return "[DefCl Object]";
   }
}

Back in "Jrs" I have a file "UseEm.java" coded:

import abc.AbcCl;
import def.DefCl;

public class UseEm
{
   public static void main ( Strin[] arguments)
   {
     AbcCl ac = new AbcCl();
     DefCl dc = new DefCl();
     System.out.println( "ac == " + ac + ", dc == " + dc + '.');
   }
}

Then I executed "javac UseEm.java", which created three class files,
an "abc\AbcCl.class", a "def\DefCl.class", and a "UseEm.java".
Finally I created two jar files with commands "jar -cf abc.jar abc"
and "jar -cf def.jar def".

Then I created a "Jrs2" directory, a sibiling to "Jrs", and copied to
it "UseEm.java" and the two JAR files. In that "Jrs2" directory I
typed in the command "javac -cp abc.jar:def.jar", and as a result got
a whole bunch of error messages. I was kind of expecting that.

At that point I typed in "jar -xf abc.jar" which extracted the "abc"
directory, and I thought that therefore I should be able to compile
"UseEm.java" with the command "javac -cp .:def.jar UseEm.java". But
when I tried it I got error messages:

6 errors

Does anybody have any idea what I'm doing wrong? Why can't I get the
code I need to compile out of this JAR file? And _why in the world_
can't my compiler see the<AbcCl> class? The "abc" directory is
_right there_, with an "AbcCl.class" and an "AbcCl.java" file right in
it?