import java.rmi.*;

   // USAGE: java AddClient <serverHostName> <serverHostPort> firstNum secondNum  

public class AddClient {
  public static void main(String args[]) {

    // The client will try to download code, in particular, it will
    // be downloading stub class from the server.
    // Any time code is downloaded by RMI, a security manager must be present.
 
    if (System.getSecurityManager() == null) { 
	   System.setSecurityManager(new RMISecurityManager()); 
    } 

    try {
      String addServerURL = "rmi://" + args[0] + ":" + args[1] + "/MyAddServer";

     System.out.println("I will try to invoke the remote method from  " + addServerURL);

      AddServerIntf remoteObj =
                    (AddServerIntf) Naming.lookup(addServerURL);

      System.out.println("The first number is: " + args[2]);

      double d1 = Double.valueOf(args[2]).doubleValue();

      System.out.println("The second number is: " + args[3]);

      double d2 = Double.valueOf(args[3]).doubleValue();

      // Now we invoke from a local machine the remote method "add"

      System.out.println("The sum is: " + remoteObj.add(d1, d2));
    }
    catch(Exception e) {
      System.out.println("Exception: " + e);
    }
  }
}