Implementation of Stop and Wait Protocol

This java program helps in implementing the stop and wait protocol. which is a special case of sliding window protocol with window size one. Where each data sent is acknowledged by the receiver.

server1.java:

import java.io.*;
import java.net.*;
public class server1{
public static void main(String args[])throws IOException{
ServerSocket sc = new ServerSocket(5000);
Socket s = sc.accept();
BufferedReader br1,br2;
String s1,s2;
PrintStream ps;
while(true){
br1 = new BufferedReader(new InputStreamReader(System.in));
s1 = br1.readLine();
if(s1 == "bye"){
    ps = new PrintStream(s.getOutputStream());
    ps.println("bye");
    break;
}
else{
System.out.println("The Data to be sent is "+s1);
ps = new PrintStream(s.getOutputStream());
ps.println(s1);
br2 = new BufferedReader(new InputStreamReader(s.getInputStream()));
s2 = br2.readLine();
System.out.println(s2);
}
}
s.close();
}
}

client1.java:

import java.io.*;
import java.net.*;
public class client1{
public static void main(String args[])throws IOException{
Socket sc = new Socket("127.0.0.1",5000);
BufferedReader br1,br2;
String s1,s2;
PrintStream ps;
while(true){
br1 = new BufferedReader(new InputStreamReader(sc.getInputStream()));
s1 = br1.readLine();
if(s1.equals("bye")){
    break;
}
else{
System.out.println("Data received is "+s1);
s2 = "Data Acknowledged is "+s1;
System.out.println(s2);
ps = new PrintStream(sc.getOutputStream());
ps.println(s2);
}
}
sc.close();
}
}

Output: