Check socket - Java

Nc.java

import java.net.*;

public class Nc {
    public static void main(String[] args){
        if(args.length < 2)
            return;

        String host = args[0];
        int port = Integer.parseInt(args[1]);
        String msg = "Port " + port + " from " + host;

        try {
            Socket socket = new Socket(host, port);
            System.out.println(msg + " opened.");
            socket.close();
        } catch (Exception e) {
                System.out.println(msg + " closed.");
        }
    }

}