How to check whether the particular port is in use

PortOpenTest.Java

import java.io.IOException;
import java.net.Socket;
import java.net.SocketException;
import java.net.UnknownHostException;

/**
 * Created by Vignesh on 26-05-2015.
 */
public class PortOpenTest {

    public static void main(String[] args) {

        PortOpenTest portTest = new PortOpenTest();
        boolean result = portTest.isPortInUse(null, 9999);
        System.out.print(result);
    }

    private boolean isPortInUse(String host, int port) {
        boolean result = false;

        try {
            (new Socket(host, port)).close();
            result = true;
        } catch (SocketException e) {
            // Could not connect.
        } catch (UnknownHostException e) {
            // Host not found
        } catch (IOException e) {
            // IO exception
        }
        
        return result;
    }
}