C:\jtest\RMI>java lineno < Hello.java
  1 //Hello.java
  2 //package example.hello;
  3 import java.rmi.Remote;
  4 import java.rmi.RemoteException;
  5 public interface Hello extends Remote {
  6     String sayHello() throws RemoteException;
  7 }// interface Hello
C:\jtest\RMI>java lineno < Server.java
  1 //Server.java
  2 //package example.hello;
  3 import java.rmi.registry.Registry;
  4 import java.rmi.registry.LocateRegistry;
  5 import java.rmi.RemoteException;
  6 import java.rmi.server.UnicastRemoteObject;
  7 public class Server implements Hello {
  8     public Server() {}
  9     public String sayHello() {
 10   return "Hello, world!";
 11     }
 12     public static void main(String args[]) {
 13   try {
 14       Server obj = new Server();
 15       Hello stub = (Hello) UnicastRemoteObject.exportObject(obj, 0);
 16 
 17       // Bind the remote object's stub in the registry
 18       Registry registry = LocateRegistry.getRegistry();
 19       registry.bind("Hello", stub);
 20 
 21       System.err.println("Server ready");
 22   } catch (Exception e) {
 23       System.err.println("Server exception: " + e.toString());
 24       e.printStackTrace();
 25   }
 26     } // main(
 27 }//class Server

C:\jtest\RMI>java lineno < Client.java
  1 //Client.java
  2 //package example.hello;
  3 import java.rmi.registry.LocateRegistry;
  4 import java.rmi.registry.Registry;
  5 public class Client {
  6     private Client() {}
  7     public static void main(String[] args) {
  8   String host = (args.length < 1) ? null : args[0];
  9   try {
 10       Registry registry = LocateRegistry.getRegistry(host);
 11       Hello stub = (Hello) registry.lookup("Hello");
 12       String response = stub.sayHello();
 13       System.out.println("response: " + response);
 14   } catch (Exception e) {
 15       System.err.println("Client exception: " + e.toString());
 16       e.printStackTrace();
 17   }
 18     }//main(
 19 }// class Client
C:\jtest\RMI>javac *java

C:\jtest\RMI>start rmiregistry
C:\jtest\RMI>javaw Server

C:\jtest\RMI>java Client
response: Hello, world!

C:\jtest\RMI>java Client 192.168.1.2
response: Hello, world!

C:\jtest\RMI>java Client 192.168.1.1
Client exception: java.rmi.ConnectException: Connection refused to host: 192.168
.1.1; nested exception is:
        java.net.ConnectException: Connection timed out: connect