try (InputStreamReader socketIn = new InputStreamReader(fSocket.getInputStream())) {
   while (isConnected()) {
      int k = socketIn.read(charData);
      ...
   }
} catch (IOException e) {
   ...
}

package p;

import java.io.IOException;
import java.io.InputStreamReader;
import java.net.Socket;

public class myClass implements Runnable {

    private Socket fSocket;

    public synchronized void connect() throws IOException {
        fSocket = new Socket("localhost", 12345);
    }

    public void run() {
        try (InputStreamReader socketIn = new InputStreamReader(fSocket.getInputStream())) {

            while (true) {
                if (socketIn.read(new char[1024]) < 0)
                    throw new IOException("Error");
            }
           
        } catch (IOException e) {
        }
    }    
}