Implementation of Sliding Window Protocol

This Java Program implements Sliding Window Protocol with the window size fixed at the client. The Server sents the exactly the number of data that the Client can receive. 

server1.java:

import java.io.*;
import java.net.*;
import java.lang.*;
public class server1{
public static void main(String args[])throws IOException{
ServerSocket sc = new ServerSocket(5002);
Socket s = sc.accept();
int count,d,e=0;
BufferedReader br1,br2;
String s1,s2;
PrintStream ps;
br1 = new BufferedReader(new InputStreamReader(s.getInputStream()));
s1 = br1.readLine();
count = Integer.parseInt(s1);
while(true){
for(d=0;d<count;d++){   
br1 = new BufferedReader(new InputStreamReader(System.in));
s1 = br1.readLine();
if(s1.equals("bye")){
    ps = new PrintStream(s.getOutputStream());
    ps.println("bye");
    e=1;
    break;
}
else{
System.out.println("The Data to be sent is "+s1);
ps = new PrintStream(s.getOutputStream());
ps.println(s1);
}}
if(e==1){
    break;
}
else{
br2 = new BufferedReader(new InputStreamReader(s.getInputStream()));
s2 = br2.readLine();
System.out.println(s2);
}}
s.close();
}
}

client1.java:

import java.io.*;
import java.util.*;
import java.net.*;
public class client1{
public static void main(String args[])throws IOException{
Socket sc = new Socket("127.0.0.1",5002);
BufferedReader br1,br2;
int count,d,e=0;
String s1,s2,s4;
PrintStream ps;
Scanner in = new Scanner(System.in);
count = in.nextInt();
String[] s3 = new String[count];
ps = new PrintStream(sc.getOutputStream());
ps.println(count);
while(true){
    for(d=0;d<count;d++){
br1 = new BufferedReader(new InputStreamReader(sc.getInputStream()));
s1 = br1.readLine();
if(s1.equals("bye")){
    e=1;
    break;
}
else{
s3[d] = s1;
    }}
if(e == 1){
    break;
}
else{   
s4 = String.join(", ",s3);
System.out.println("Data received is "+s4);
s2 = "Data Acknowledged is "+s4;
ps = new PrintStream(sc.getOutputStream());
ps.println(s2);
}
}
sc.close();
}
}

Output: