I have just started learning java. I modified the client side code for a server/client communication program, by creating two threads for the client side, main thread for receiving user's input, and inputThread for receiving server's response. I am sure that server has sent the response to client, however, no response message is obtain at client.

Here is my code. Can anyone help me to figure it out? Thanks

package clientnio;

import java.net.*; 
import java.nio.*; 
import java.io.*;
import java.nio.channels.*; 
import java.util.Scanner; 

public class ClientNIO {
public static int bufferLen = 50;
public static SocketChannel client;
public static ByteBuffer writeBuffer;
public static ByteBuffer readBuffer;

public static void main(String[] args) { 
    writeBuffer = ByteBuffer.allocate(bufferLen);
    readBuffer = ByteBuffer.allocate(bufferLen);

    try { 
        SocketAddress address = new InetSocketAddress("localhost",5505); 
        System.out.println("Local address: "+ address);
        client=SocketChannel.open(address);
        client.configureBlocking(false); 

        //readBuffer.flip();
        new inputThread(readBuffer);

        /*
        String a="asdasdasdasddffasfas"; 
        writeBuffer.put(a.getBytes()); 
        writeBuffer.clear();  
        int d=client.write(writeBuffer);
        writeBuffer.flip();
        */

        while (true) {
            InputStream inStream = System.in;
            Scanner scan = new Scanner(inStream);
            if (scan.hasNext()==true) {
                String inputLine = scan.nextLine();
                writeBuffer.put(inputLine.getBytes()); 
                //writeBuffer.clear();
                System.out.println(writeBuffer.remaining());
                client.write(writeBuffer);
                System.out.println("Sending data: "+new String(writeBuffer.array()));
                writeBuffer.flip(); 
                Thread.sleep(300);
            }
        }                 
    } 
    catch(Exception e) { 
        System.out.println(e);
    } 

}
}

class inputThread extends Thread {
private ByteBuffer readBuffer;
public inputThread(ByteBuffer readBuffer1) {  
    System.out.println("Receiving thread starts.");
    this.readBuffer = readBuffer1;
    start();
}

@Override
public void run() {
    try {
        while (true) {
            readBuffer.flip();
            int i=ClientNIO.client.read(readBuffer); 
            if(i>0) { 
                byte[] b=readBuffer.array(); 
                System.out.println("Receiving data: "+new String(b)); 
                    //client.close(); 
                    //System.out.println("Connection closed."); 
                    //break; 
            }
            Thread.sleep(100); 
        }
    }
    catch (Exception e) {
       System.out.println(e);
    }
  }
}