Java socket connection

Question

I've tried to test socket connection in Java, but failed. Here is my code (two simple applications, server and client):

public class TestServer {

public static void main(String args[]) throws IOException {
    ServerSocket serverSocket = new ServerSocket(1111);
    System.out.println("Server socket created");
    Socket socket = serverSocket.accept();
    System.out.println("Socket accepted");
    PrintWriter output =  new PrintWriter(socket.getOutputStream(), true);
    System.out.println("Output created");
    output.write("Output string");
    socket.close();
    serverSocket.close();       
}
}

public class TestClient {

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

    Socket socket = new Socket("127.0.0.1", 1111);
    BufferedReader input = new BufferedReader(new InputStreamReader(socket.getInputStream()));
    System.out.println("Input: " + input.readLine());
    socket.close();

}

}

Output is (after running a server and, after it, client):

Server socket created
Socket accepted
Output created
Input: null

I've no idea what's the problem and why client didn't receive string sent to it. I'd appreciate any help.

Answer 1

Usually when I use classes like PrintWriter or OutputStream I need to flush its contents to send the data through a socket or write it to a file.