How can I close the socket in a proper way? [duplicate]

Answer 1

From javadoc :

The Java runtime automatically closes the input and output streams, the client socket, and the server socket because they have been created in the try-with-resources statement.

Also

The finalize() method is called by the Java virtual machine (JVM) before the program exits to give the program a chance to clean up and release resources. Multi-threaded programs should close all Files and Sockets they use before exiting so they do not face resource starvation. The call to server.close() in the finalize() method closes the Socket connection used by each thread in this program.

protected void finalize(){
//Objects created in run method are finalized when
//program terminates and thread exits
     try{
        server.close();
    } catch (IOException e) {
        System.out.println("Could not close socket");
        System.exit(-1);
    }
  }