java own package use-plz somebody help

haii,,,
i have heard the uses of packages.
we can create our own package.and then can import and access it frm another package.
i have tried it.but ends up with failure.

now, my first package's source D:\javacodings\codings\try
try is the nam eof my package,and it contains. file 'sample.java'
and the content in the file

Code:

Package try;

public class sample
{
public void add()
{
System.out.println("package works");
}
}

my send package D:\javacodings\codings\usingtry
it contains "sam.java"

and its content

Package usingtry;
import try.*;
class sam
{
public static void main(String a[])
{
sample s=new sample();
s.add();
}

}

i have tried to use the sample class in try package,,
when i tr y to compile the file in my try package,,i.e sample.java

i get the following error

D:\javacodings\codings\try>javac sample.java
sample.java:1: 'class' or 'interface' expected
Package try;
^
1 error

plzzzz tell what mistake i have done,,
and correct it,,
thank yu