ServerImpl.java

package com.rmicallback.server;

import com.rmicallback.client.ClientInterface;
import java.rmi.RemoteException;
import java.rmi.server.UnicastRemoteObject;
import java.util.ArrayList;
import java.util.List;

public class ServerImpl extends UnicastRemoteObject implements ServerInterface{

    private List<ClientInterface> clients = new ArrayList();

    public ServerImpl() throws RemoteException{
        super();
    }

    @Override
    public int setClientInterface(ClientInterface cli) throws RemoteException{
        clients.add(cli);
        return clients.indexOf(cli);
    }

    @Override
    public void action(int value) throws RemoteException {
        System.out.println("ACTION!");
        clients.get(value).notifyMe();
        System.out.println("N VALUE IS : "+clients.get(value).getN());
    }
}