Client.java

import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.net.Socket;
import java.net.UnknownHostException;

public class Client {
	public static void main(String[] args) throws UnknownHostException,
			IOException {
		Socket server = new Socket("localhost", 8888);

		InputStream in = server.getInputStream();
		OutputStream out = server.getOutputStream();

		String outString = "Hello\n";
		out.write(outString.getBytes());
		out.close();

		ByteArrayOutputStream bos = new ByteArrayOutputStream();
		int temp;
		while ((temp = in.read()) != -1) {
			bos.write(temp);
		}
		byte[] ba = bos.toByteArray();
		in.close();

		System.out.println(new String(ba));

		server.close();
	}
}

esception in client

Exception in thread "main" java.net.SocketException: Socket closed
	at java.net.SocketOutputStream.socketWrite(SocketOutputStream.java:99)
	at java.net.SocketOutputStream.write(SocketOutputStream.java:124)
	at Server.main(Server.java:33)

Server.java

import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.net.ServerSocket;
import java.net.Socket;

public class Server {
	public static void main(String[] args) throws IOException {
		ServerSocket serverSocket = new ServerSocket(8888);

		while (true) {
			Socket client = serverSocket.accept();

			InputStream in = client.getInputStream();
			OutputStream out = client.getOutputStream();

			ByteArrayOutputStream bos = new ByteArrayOutputStream();

			int temp;
			while ((temp = in.read()) != -1) {
				bos.write(temp);
			}
			byte[] ba = bos.toByteArray();
			// close the in
			in.close();

			String inString = new String(ba);
			System.out.println(inString);

			String outString = "World\n";

			out.write(outString.getBytes());
			out.close();

			client.close();
		}
	}
}