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

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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:

UseEm.java:1: package abc does not exist
import abc.AbcCl;
          ^
UseEm.java:2: package def does not exist
import def.DefCl;
          ^
UseEm.java:8: cannot find symbol
symbol  : class AbcCl
location: class UseEm
    AbcCl ac = new AbcCl();
    ^
UseEm.java:8: cannot find symbol
symbol  : class AbcCl
location: class UseEm

    AbcCl ac = new AbcCl();
                   ^
UseEm.java:9: cannot find symbol
symbol  : class DefCl
location: class UseEm
    DefCl dc = new DefCl();
    ^
UseEm.java:9: cannot find symbol
symbol  : class DefCl
location: class UseEm
    DefCl dc = new DefCl();
                   ^
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?

Kevin Simonson

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Why Doesn't my Code Work with this Jar File? KevinSimonson <kvnsmnsn@hotmail.com> - 2011-11-01 10:39 -0700
  Re: Why Doesn't my Code Work with this Jar File? markspace <-@.> - 2011-11-01 11:23 -0700
  Re: Why Doesn't my Code Work with this Jar File? Arved Sandstrom <asandstrom3minus1@eastlink.ca> - 2011-11-01 20:21 -0300
    Re: Why Doesn't my Code Work with this Jar File? Lew <lewbloch@gmail.com> - 2011-11-01 16:59 -0700
      Re: Why Doesn't my Code Work with this Jar File? Arne Vajhøj <arne@vajhoej.dk> - 2011-11-01 22:14 -0400
        Re: Why Doesn't my Code Work with this Jar File? Arved Sandstrom <asandstrom3minus1@eastlink.ca> - 2011-11-02 07:13 -0300
          Re: Why Doesn't my Code Work with this Jar File? KevinSimonson <kvnsmnsn@hotmail.com> - 2011-11-02 16:44 -0700
            Re: Why Doesn't my Code Work with this Jar File? markspace <-@.> - 2011-11-02 18:16 -0700
          Re: Why Doesn't my Code Work with this Jar File? Arne Vajhøj <arne@vajhoej.dk> - 2011-11-02 20:00 -0400
  Re: Why Doesn't my Code Work with this Jar File? Roedy Green <see_website@mindprod.com.invalid> - 2011-11-03 00:47 -0700
  Re: Why Doesn't my Code Work with this Jar File? Roedy Green <see_website@mindprod.com.invalid> - 2011-11-03 00:50 -0700

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