Sliding Window Program in JAVA

                                  Slide Receiver

import java.net.*; 

import java.io.*; 

class slidreceiver 

{ 

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

{ 

Socket s=new Socket(InetAddress.getLocalHost(),10); 

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")); 

} 

}

                                         Slide Sender

import java.net.*;

import java.io.*;

import java.rmi.*;

public class slidsender

{

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

{

ServerSocket ser=new ServerSocket(10);

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(); 

} 

}