Port Scanner

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: javagalaxy.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
}
}