Port Scanner Using Java

import java.net.*; import java.io.IOException; import javax.swing.*; import java.awt.*; import java.awt.event.*; public class PScanner { public static void main(String[] args) { InetAddress ia=null; String host=null; try { host=JOptionPane.showInputDialog("Enter the Host name to scan:\n example: xxx.com"); if(host!=null){ ia = InetAddress.getByName(host); scan(ia); } } catch (UnknownHostException e) { System.err.println(e ); } System.out.println("Bye from NFS"); //System.exit(0); } public static void scan(final InetAddress remote) { //variables for menu bar int port=0; String hostname = remote.getHostName(); for ( port = 0; port < 65536; port++) { try { Socket s = new Socket(remote,port); System.out.println("Server is listening on port " + port+ " of " + hostname); s.close(); } catch (IOException ex) { // The remote host is not listening on this port System.out.println("Server is not listening on port " + port+ " of " + hostname); } }//for ends } }