Sockets

I have written a simple client server program using sockets. There is no compilation and run time error. However the application does not seem to do the logics I have written. Did I miss something?.
Client
-------
 
import java.io.*;
import java.net.*;
 
public class Client
{
	Socket s;
	PrintWriter out;
	BufferedReader in;
	
	public Client()
	{
		try
		{ 
	        s = new Socket("127.0.0.1",1418);
	        out = new PrintWriter(s.getOutputStream());
	        in = new BufferedReader(new InputStreamReader(s.getInputStream()));
	        out.write("Hi");
	        String m = in.readLine();
	        System.out.println(m);
		}
		catch(Exception e)
		{
			System.out.println(e);
		}
	}
	 
    public static void main(String[] args) 
    {
        Client m = new Client();
    }
}
 
 
Server
---------
 
public class Server 
{
	PrintWriter out;
	BufferedReader in;
	ServerSocket ss;
	Socket sc;
	
	public Server()
	{
		try
		{
			ss = new ServerSocket(1418);
			sc = ss.accept();
			out = new PrintWriter(sc.getOutputStream());
			in = new BufferedReader(new InputStreamReader(sc.getInputStream()));
			String m = in.readLine();
			out.write(m);
		}
		catch(Exception e)
		{
			System.out.println(e);
		}
	}
	
    public static void main(String[] args) 
    {
    	Server s = new Server();
    }
}

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eugene007Asked:
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ozlevanonCommented:
Your client is writing just 2 characters "hi", but the server is inovking readLine, which waits for a newline character before it returns.
If you change you client to write "hi\n" it will probably fix it. Also, pay attention that calling write() method doesn't guarantee that the data will be flushed, so in any event, call flush() when you want to make sure the data is actually written.
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eugene007Author Commented:
I tried and it does not work.
0
eugene007Author Commented:
Also I switched write() method to println() method.
0
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Ajay-SinghCommented:
Try flush after you write to PrintWriter both on the client
and the server side.
0
eugene007Author Commented:
Now it works. This is quite odd. I need to flush the data even when im using the println() method to write.
0
CEHJCommented:
>>I need to flush the data even when im using the println() method to write.

You won't do if you do

out = new PrintWriter(s.getOutputStream(), true);
0

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eugene007Author Commented:
so the purpose of the flush() method is to ensure that what is written are commited.
0
Ajay-SinghCommented:
Yes.
0
CEHJCommented:
>>so the purpose of the flush() method is to ensure that what is written are commited.

No. It's in no way transactional. There's no 'rollback' for instance. And when you close(), it will get flushed automatically.

Its purpose is to transfer what's held in the buffers to the stream immediately
0
CEHJCommented:
:-)
0
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