Compilation problem

[hakeem46]

I wrote a program that was compiled successfully.
I wrote another program to use it but it will not see it.
I am using JDK 1.4._2

"import java.io.*;
import java.sql.*;
class RunPM4DataAdmin{
    public static void main(String[] arg){
        PM4DataAdmin trythis = new PM4DataAdmin();
        int requiredSize = trythis.getSize();
        System.out.println(requiredSize);
    }
}

Trying to compile this, I get the following

cannot resolve symbol
class PM4DataAdmin.

But I know PM4DataAdmin was successfully compiled and it should see this class successfully.
Thank you for your help.