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class StopSocketSocketReader implements Runnable {
  private final Socket socket;
  private final BufferedReader in;
  private final Object lock = new Object();
  private volatile boolean done = false;

  public StopSocketSocketReader() throws IOException {
    this.socket = new Socket("somehost", 25);
    this.in = new BufferedReader(new InputStreamReader(this.socket.getInputStream()));
  }
  
  // Only one thread can use the socket at a particular time
  public void run() {
    String string;
    try {
      synchronized (lock) {
        while (!done && (string = in.readLine()) != null) {
          // Blocks until end of stream (null)
        }
      }
    } catch (IOException ie) {
      // Forward to handler
    }
  }

  public void shutdown() {
    done = true;
  }

  public static void main(String[] args) throws IOException, InterruptedException {
    StopSocketSocketReader ssreader = new StopSocketSocketReader();
    Thread thread = new Thread(ssreader);
    thread.start();
    Thread.sleep(1000);
    ssreader.shutdown();
  }
}

class StopSocketSocketReader implements Runnable {
  // ...
  
  public void run() { 
    String string;
    try {
      synchronized (lock) {
        while (!Thread.interrupted() && (string = in.readLine()) != null) { 
          // Blocks until end of stream (null)
        }
      }
    } catch (IOException ie) { 
      // Forward to handler
    }
  }
  
  public static void main(String[] args) throws IOException, InterruptedException {
    StopSocketSocketReader ssreader = new StopSocketSocketReader();
    Thread thread = new Thread(ssreader);
    thread.start();
    Thread.sleep(1000); 
    thread.interrupt();
  }
}

class StopSocketSocketReader implements Runnable {
  // ...
  
  public void run() { 
    String string;
    try {
      synchronized (lock) {
        while ((string = in.readLine()) != null) { 
          // Blocks until end of stream (null)
        }
      }
    } catch (IOException ie) { 
      // Forward to handler
    } finally {
      try {
        shutdown();
      } catch (IOException e) {
        // Forward to handler
      }
    }
  }
  
  public void shutdown() throws IOException {
    socket.close();
  }

  public static void main(String[] args) throws IOException, InterruptedException {
    StopSocketSocketReader ssreader = new StopSocketSocketReader();
    Thread thread = new Thread(ssreader);
    thread.start();
    Thread.sleep(1000); 
    ssreader.shutdown();
  }
}

class StopSocketSocketReader implements Runnable {
  private final SocketChannel sc;
  private final Object lock = new Object;
  
  public StopSocketSocketReader() throws IOException {
    this.sc = SocketChannel.open(new InetSocketAddress("somehost", 25));    
  }
  
  public void run() {
    ByteBuffer buf = ByteBuffer.allocate(1024);
    try {
      synchronized (this.lock) {
        while (!Thread.interrupted()) {
          this.sc.read(buf);
          // ...
        }
      }
    } catch (IOException ie) {
      // Forward to handler
    }
  }

  public static void main(String[] args) throws IOException, InterruptedException {
    StopSocketSocketReader ssreader = new StopSocketSocketReader();
    Thread thread = new Thread(ssreader);
    thread.start();
    Thread.sleep(1000);
    thread.interrupt();
  }
}