A URLClassLoader can be used to load classes in any directory. import java.io.File; import java.net.URL; import java.net.URLClassLoader; public class Main { public static void main(String[] argv) throws Exception { File file = new File("c:\\"); URL url = file.toURI().toURL(); URL[] urls = new URL[] { url }; ClassLoader cl = new URLClassLoader(urls); Class cls = cl.loadClass("com.mycompany.MyClass"); } }