Adding a package to java

Question

I'm trying to use a package to write some programs out of a java book. (The package comes from the same book.) I read a tutorial at java.sun.com on adding packages to the jre/lib/ext folder. I made a .jar file (named bookclass.jar), put it there and was able to compile a sample program. However, when I tried to execute the program, it gives me this error:
Exception in thread "main" java.lang.NoClassDefFoundError: ann/easyio/Screen
        at Greeter1.main(Greeter1.java:15)I also tried just putting the package in a folder and setting the CLASSPATH enviroment variable, which also allowed me to compile, but gave me the same error when trying to run.
Any help would be greatly appreciated

Answer 1

RE: Radish 21
I already have that in my class.
Here's the sample class: (the blank comments are to force line spacing)
/* Greeeter1.java is a simple first Java program that displays a greeting to a user */
/* Output: A greeting that includes the current date and time                       */
import ann.easyio.*; // Screen class
import java.util.*; // Date class
class Greeter1 extends Object
   public static void main(String args[])
      Date currentDate = new Date();
      String today = currentDate.toString();
      Screen theScreen = new Screen();
      theScreen.println("Welcome! Today, " + today + ", you begin your study of Java!");
   }Before I made the .jar file, the javac couldn't find the package while compiling. After I was able to copile, java couldn't find the package while executing. I checked, and there's no main in the ann.easyio.Screen class.
Re: YATArchivist
CLASSPATH was C:\j2sdk1.4.1_02\classes , and like I said before, when I put the package in the classes folder, the program compiled to a class, but the class would not execute.
I then deleted CLASSPATH when I tried the other solution
CLASSPATH isn't necessary to run the classes, is it?