Взаимодействие между клиентом и сервером

import java.io.*;
import java.net.*;
import java.util.*;
public class Server
{
public static void main(String[] args)
{
try
{
ServerSocket s=new ServerSocket(8189);
Socket incoming=s.accept();
try
{
InputStream inStream=incoming.getInputStream();
OutputStream outStream=incoming.getOutputStream();
Scanner in=new Scanner(inStream);
PrintWriter out=new PrintWriter(outStream,true);
boolean b=false;String line=""; out.println("Welkome");
while(b==false)
{
if(in.hasNextLine())
{   
line=in.nextLine();
if(line.trim().equals("Hello"))
{
out.println("Hii");
b=true;
}
}
}
}
finally
{
incoming.close();
}
}
catch(IOException e)
{
e.printStackTrace();
}
}
}
--------------------------------------------------
import java.io.*;
import java.util.*;
import java.net.*;
public class User
{
public static void main(String[] args) throws IOException
{
Socket s=new Socket("localhost",8189);
InputStream inStream=s.getInputStream();
OutputStream outStream=s.getOutputStream();
Scanner in=new Scanner(inStream);
PrintWriter out=new PrintWriter(outStream,true);
boolean b=false;String l="",l2="";
while(b==false)
{
if(in.hasNextLine())
{
l=in.nextLine();
b=true;
}
}
System.out.println(l);
b=false;
out.write("Hello");
while(b==false)
{
if(in.hasNextLine())
{
l2=in.nextLine();
b=true;
}
}
System.out.println(l2);
}
}