(receiver side) Java Program to implementing 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.Socket;

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

Socket s=new Socket("localhost",7870);

DataInputStream in=new DataInputStream(s.getInputStream());
PrintStream p=new PrintStream(s.getOutputStream());
int i=0,rptr=-1,nf,rws=8;
String rbuf[]=new String[8];
String ch; System.out.println();
do
{
nf=Integer.parseInt(in.readLine());
if(nf<=rws-1)
{
for(i=1;i<=nf;i++)
{
rptr=++rptr%8;
rbuf[rptr]=in.readLine();
System.out.println("The received Frame " +rptr+" is : "+rbuf[rptr]);
}
rws-=nf;
System.out.println("\nAcknowledgment sent\n");
p.println(rptr+1); rws+=nf; }
else
break;
ch=in.readLine();
}
while(ch.equals("yes"));
}
}


OUTPUT:

//RECEIVER OUTPUT
The received Frame 0 is : hiii
The received Frame 1 is : how r u
The received Frame 2 is : i am fine
The received Frame 3 is : how is evryone