//This is subtract Server that is responsible for subtract two integer numbers
import java.net.*;
import java.rmi.*;
import java.rmi.server.UnicastRemoteObject;
public class subtractServerImpl extends UnicastRemoteObject implements subtractInterface{
String newLine = System.getProperty("line.separator"); 
public subtractServerImpl() throws RemoteException{
  System.out.println("Initializing subtractServer");
}


public static void main(String arg[]){
System.setSecurityManager(new RMISecurityManager());
try{
subtractServerImpl SSI=new subtractServerImpl();
Naming.rebind("subtractserver", SSI);
  System.out.println("registered with Registry");
} catch (RemoteException e){
  System.out.println("I catch RemoteExceptiom Error: " + e);
} catch (java.net.MalformedURLException e){
  System.out.println("URL Error:" + e);
}
}


public String subtract(int a, int b){
  return ("The subtract method is invoked in subtract server"+
           newLine+a+"-"+b+" = "+(a-b)+newLine+newLine);
}

}