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

public class TcpServer {

    public static void main(String[] args) throws IOException {

        ServerSocket serverSocket = new ServerSocket(8888);

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

            new Thread(() -> {
                try {
                    InputStream inputStream = socket.getInputStream();
                    OutputStream outputStream = socket.getOutputStream();

                    byte[] buffer = new byte[1024];

                    int len;
                    while ((len = inputStream.read(buffer)) != -1) {
                        System.out.println(new String(buffer, 0, len));
                        outputStream.write(buffer, 0, len);
                        outputStream.flush();
                    }

                    socket.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }).start();
        }
    }
}

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

public class TcpClient {

    public static void main(String[] args) throws IOException {

        Socket socket = new Socket("localhost", 8888);

        OutputStream outputStream = socket.getOutputStream();

        for (int i = 0; i < 10; i++) {
            String message = "Hello, World!";
            byte[] buffer = message.getBytes();
            outputStream.write(buffer);
            outputStream.flush();
        }

        InputStream inputStream = socket.getInputStream();

        byte[] buffer = new byte[1024];
        int len = inputStream.read(buffer);
        System.out.println(new String(buffer, 0, len));

        socket.close();
    }
}

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for (int i = 0; i < 10; i++) {
    String message = "Hello, World!";
    byte[] buffer = message.getBytes();
    outputStream.write(buffer, 0, buffer.length / 2);
    outputStream.write(buffer, buffer.length / 2, buffer.length / 2);
    outputStream.flush();
}

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