Java APIs

I got some very interesting problems....

I've got two source files:

Hello.java, Use.java

Hello.java:

package pack;
public class Hello
{
public static void fun(String[] args)
{
System.out.println("Hello World!");
}
}

Use.java:

class Use
{
public static void main(String[] args)
{
Hello.fun();
}
}

I compiled Hello.java using the command : javac -d . Hello.java
it worked well and I got the class file in the folder "pack" in the working directory.

In the working directory, I have Use.java, the folder "pack" that contains Hello.class and a folder "source" that contains "Hello.java".

when I try to compile Use.java, I get the following error:

Use.java:5: cannot find symbol
symbol : variable Hello
location: class Use
Hello.fun();
^
1 error

To clear this, I tried to use CLASSPATH environment variable to point to Hello.class that is present in the folder "pack".

to the existing CLASSPATH value of

D:\Program Files\Java\jre1.5.0_16\lib\rt.jar;D:\Program Files\Apache Software Foundation\Tomcat 5.5\common\lib\servlet-api.jar;.;D:\oraclexe\app\oracle\product\10.2.0\server\jdbc\lib\ojdbc14.jar

I added C:\pack by the following command:

set CLASSPATH=%CLASSPATH%;C:\pack

And then again I tried to compile Use.java without providing the import statement as

javac use.java

and I got the following error:

Use.java:5: cannot access Hello
bad class file: C:\pack\Hello.class
class file contains wrong class: pack.Hello
Please remove or make sure it appears in the correct subdirectory of the classpath.
Hello.fun();
^
1 error

Can anyone please help me out with this.