rmi calculator

import java.rmi.RemoteException;
import java.rmi.server.UnicastRemoteObject;
import java.util.Scanner;

public class Implement extends UnicastRemoteObject implements Chatting
{

    public String[] r;
    public String o = "", o1 = "", o2 = "";

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

    @Override
    public String getMessage() throws RemoteException
    {
        Scanner sc = new Scanner(System.in);
        System.out.print("My Message: ");
        //String message = sc.next();
        String message = "";
        if (o.equals("+"))
        {
            message = Double.toString(Double.parseDouble(o1) + Double.parseDouble(o2));
        }
        else if (o.equals("-"))
        {
            message = Double.toString(Double.parseDouble(o1) - Double.parseDouble(o2));
        }
        else if (o.equals("*"))
        {
            message = Double.toString(Double.parseDouble(o1) * Double.parseDouble(o2));
        }
        else if (o.equals("/"))
        {
            try
            {
                message = Double.toString(Double.parseDouble(o1) / Double.parseDouble(o2));
            }
            catch (Exception e)
            {
                message = e.getMessage();
            }
        }
        return message;
    }

    @Override
    public void sendMessage(String s) throws RemoteException
    {
        System.out.println("Client's Message: " + s);
        r = s.split(":");
        o1 = r[0];
        o2 = r[1];
        o = r[2];

    }

}