// FactRMI.java Interfacepublicinterface FactRMI extends java.rmi.Remote
{
    long countfact(int num) throws java.rmi.RemoteException;

}


// FactRMIImpl.java, FactRMI implementation

import java.rmi.*;
import java.rmi.server.UnicastRemoteObject;

publicclass FactRMIImpl extends UnicastRemoteObject implements FactRMI
{
  privateint fact;

  public FactRMIImpl(String name) throws RemoteException
  {
    super();
    try
    {
      Naming.rebind(name, this);
      fact = 1;
    } 
    catch (Exception e)
    { 
    System.out.println("Exception: " + e.getMessage());
        e.printStackTrace();
    }
  }

  publiclong countfact(int num) throws RemoteException
  { 
    for(int i=1;i<=num;i++)
    {
        fact = fact * i;
    }
    return fact;
  }

}


// FactRMIServer.java

import java.rmi.*;
import java.rmi.server.*;

publicclass FactRMIServer
{

 publicstaticvoid main(String args[])
 {

   // Create and install the security manager
   System.setSecurityManager(new RMISecurityManager());

   try
   {
     // Create CountRMIImpl
     FactRMIImpl myFact = new FactRMIImpl("//Binita/myFactRMI");
     System.out.println("FactRMI Server ready.");
   } 
   catch (Exception e)
   { 
     System.out.println("Exception: " + e.getMessage());
     e.printStackTrace();
   }
 }
}


// FactRMIClient.java  RMI Count client

import java.rmi.*;
import java.rmi.registry.*;
import java.rmi.server.*;
import java.io.DataInputStream;

publicclass FactRMIClient
{ publicstaticvoid main(String args[])
  { 
    // Create and install the security manager
    System.setSecurityManager(new RMISecurityManager());
    DataInputStream in = new DataInputStream(System.in);
    int num;
    
    try
    { 
    FactRMI myFact = (FactRMI)Naming.lookup("//"
                          + args[0] + "/" + "myFactRMI");
      

    System.out.println("\nEnter the number :");
    num = Integer.parseInt(in.readLine());
      // Calculate Factoriallong FactVal = myFact.countfact(num);

      System.out.println("Factorial = " + FactVal);
    } 
    catch(Exception e)
    { 
    System.err.println("System Exception" + e);
    }
   System.exit(0);
  }
}


// OUTPUT


Enter the number :
10
Factorial = 3628800