Classpath for J2SDK 1.4.1

Hello,
I'm a beginner to Java and I'm using Mandrake Linux 9.0 and J2SDK 1.4.1. I would like to ask how to set the class path for the SDK? Meanwhile, I always get this error message when compilering a java file that uses class packages.(i.e. javax.swing.JOptionPane)
Some of the error:
===
$ javac DemoPaint.java
DemoPaint.java:4: error:Cannot find class "JApplet" [JLS 8]
$
===
$ javac Lab4_1.java
Lab4_1.java:1: error:Import of type "javax/swing/JOptionPane" from unamed package [JLS 7.6]
Lab4_1.java:1: error:Cannot find class "javax/swing/JOptionPane" [JLS 8]
$
===
Thank you!
Charles Cheng

If did you set correct CLASSPATH?
CLASSPATH="$JAVA_HOME/jre/lib/rt.jar:$JAVA_HOME/lib/too
s.jar:."Don't do that. In general, never put JDK jars into
your classpath. Let the Java VM find it by itself -
they all do.
Make sure that Mandrake is not shipping with Kaffe or
any such silly VM (RedHat used to do this -
/usr/bin/java was Kaffe!).
Check your $PATH, and make sure that
/usr/java/j2sdk1.4.1_01/bin is in your PATH before
/usr/bin, and that that is the Java that is picked
up:
$ java -version
java version "1.4.1_01"
Java(TM) 2 Runtime Environment, Standard Edition
(build 1.4.1_01-b01)
Java HotSpot(TM) Client VM (build 1.4.1_01-b01, mixed
mode)If you see this output, you should be OK.
Once again, do NOT put any standard Java jars into
your CLASSPATH!.A PROBLEM
After I removed JDK jars from CLASSPATH, my jikes cannot work. It tell me cannot find java.util.........

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