import java.io.DataInputStream;
import java.io.DataOutputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.lang.reflect.Method;
import java.net.URL;
import java.net.URLClassLoader;

public class face {
    public static void main(String[] args) throws IOException,
            ClassNotFoundException {

        File f = new File("book.class");
        int count;
        byte[] buffer = new byte[1024];
        DataInputStream dis = new DataInputStream(new FileInputStream(f));
        StringBuilder all = new StringBuilder();
        while ((count = dis.read(buffer)) > 0) {
            all.append(buffer);
        }
        File b = new File("book.class");
        FileOutputStream fos = new FileOutputStream(b);
        DataOutputStream dos = new DataOutputStream(fos);
        dos.write(all.toString().getBytes());
        String absolutePath = b.getAbsolutePath();

        URL classs[] = { b.toURI().toURL() };
        URLClassLoader sysloader = new URLClassLoader(classs);
        Class sysclass = sysloader.loadClass("book");
        try {
            Method method = sysclass.getDeclaredMethod("go", null);
            method.setAccessible(true);
            method.invoke(new Object() {
            }, null);
        } catch (Throwable t) {
            t.printStackTrace();
            throw new IOException(
                    "Error, could not add URL to system classloader");
        }

    }
}