import java.io.DataInputStream;

import java.io.DataOutputStream;

import java.io.IOException;

import java.io.InputStream;

import java.io.OutputStream;

import java.net.ServerSocket;

import java.net.Socket;

public class Server {

public int add(int a, int b){

return a+b;

}

public int sub(int a, int b){

return a-b;

}

public static void main(String[] args) throws IOException{

ServerSocket server= new ServerSocket(5000);

int result=0;

Server myCalculation= new Server();

System.out.println("Server: I am waiting for a client...");

Socket mySocket= server.accept();

System.out.println("Server: I got a client...");

InputStream input= mySocket.getInputStream();

DataInputStream datainput= new DataInputStream(input);

//System.out.println("Server: the message from client is: "+datainput.readUTF());

String []data= datainput.readUTF().split(":");

if(data[0].equals("add")){

result=myCalculation.add(Integer.parseInt(data[1]),Integer.parseInt(data[2]) );

}

else{

result=myCalculation.sub(Integer.parseInt(data[1]),Integer.parseInt(data[2]) );

}

OutputStream output= mySocket.getOutputStream();

DataOutputStream dot= new DataOutputStream(output);

dot.writeUTF("Server: result is: "+result);

dot.close();

output.close();

mySocket.close();

}

}