JAVA 채팅 클라이언트

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.PrintWriter;
import java.net.Socket;

public class client
{
	public static void main(String[] args)
	{
		BufferedReader user = new BufferedReader(new InputStreamReader(
				System.in));
		Socket socket;
		try
		{
			socket = new Socket("115.20.247.142", 1251);
			PrintWriter out = new PrintWriter(socket.getOutputStream(), true);
			ReceiveThread rt = new ReceiveThread(socket);
			rt.start();
			while (true)
			{
				out.println(user.readLine());
			}
		} catch (IOException e)
		{
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
	}

}

class ReceiveThread extends Thread
{
	Socket socket;

	public ReceiveThread(Socket socket)
	{
		this.socket = socket;
	}

	@Override
	public void run()
	{
		BufferedReader in;
		try
		{
			in = new BufferedReader(new InputStreamReader(
					socket.getInputStream()));
			while (true)
			{
				System.out.println(in.readLine());
			}

		} catch (IOException e)
		{
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
		super.run();
	}
}