(sender side) Java Program to implement Sliding Window Protocol while sending a message travelling from sender to receiver (CN)

/*Aim: A Java Program implementing Sliding Window Protocol while sending a message travelling from sender to receiver. */
/*For complete explanation visit: Prof. Brinda's Blog*/

import java.io.DataInputStream;
import java.io.PrintStream;
import java.net.ServerSocket;
import java.net.Socket;

public class slidsender
{
public static void main(String a[])throws Exception
{

ServerSocket ser=new ServerSocket(7870);
Socket s=ser.accept();
DataInputStream in=new DataInputStream(System.in);
DataInputStream in1=new DataInputStream(s.getInputStream());
String sbuff[]=new String[8];
PrintStream p;
int sptr=0,sws=8,nf,ano,i;
String ch;
do
{
p=new PrintStream(s.getOutputStream());
System.out.print("Enter the no. of frames : ");
nf=Integer.parseInt(in.readLine());
p.println(nf);
if(nf<=sws-1)
{

System.out.println("Enter "+nf+" Messages to be send\n");
for(i=1;i<=nf;i++)
{
sbuff[sptr]=in.readLine();
p.println(sbuff[sptr]);
sptr=++sptr%8;
}
sws-=nf;
System.out.print("Acknowledgment received");
ano=Integer.parseInt(in1.readLine());
System.out.println(" for "+ano+" frames");
sws+=nf;
}
else
{
System.out.println("The no. of frames exceeds window size");
break;
}
System.out.print("\nDo you wants to send some more frames : ");
ch=in.readLine(); p.println(ch);
}
while(ch.equals("yes"));
s.close();
}
}


OUTPUT:

//SENDER OUTPUT
Enter the no. of frames : 4
Enter 4 Messages to be send

hiii
how r u
i am fine
how is evryone
Acknowledgment received for 4 frames

Do you wants to send some more frames : no