Scan Port [ source ]

I was looking for something about js so I decided to make a simple scan port with dialogs.
If you got any question please ask.
I also got the .jar so if someone wants it let me know.

Code:

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import java.net.*; 
import java.io.IOException; 
import javax.swing.*; 
import java.awt.*; 
import java.awt.event.*; 
    public class Main { 
        public static void main(String[] args) { 
        InetAddress ia=null; 
        String host=null;
        String getPort = null;
        String showDialog = null;
       
        Object[] result_show = {"Console","Dialog"};
       
        int port = 0;
            try { 
             
            host=JOptionPane.showInputDialog("Enter the Host name to scan:\n example: xxx.ro");
            getPort=JOptionPane.showInputDialog("Port?");
            showDialog =  (String)JOptionPane.showInputDialog(null,"Were do you want to see the result?","Question",JOptionPane.PLAIN_MESSAGE,null,result_show,"Console");
            port = Integer.parseInt(getPort);   
                if(host!=null){ 
                ia = InetAddress.getByName(host); 
            scan(ia,port,showDialog); } 
        } 
            catch (UnknownHostException e) { 
            System.err.println(e ); 
        } 
        System.exit(0); 
    } 
       
        public static void scan(final InetAddress remote,int port,String showDialog){
                String hostname = remote.getHostName();
                try{
                        Socket s = new Socket(remote,port);
                        if((showDialog != null) && (showDialog.length() > 0 ) && (showDialog == "Dialog")){
                        JOptionPane.showMessageDialog(null, "Port (open): " + port + " on host " + hostname);
                }else{
                        System.out.println("Port (open): " + port + " on host "+ hostname); }
                        s.close();
                       
                }
                catch(IOException ex){
                        if((showDialog != null) && (showDialog.length() > 0 ) && (showDialog == "Dialog")){
                          JOptionPane.showMessageDialog(null, "Port (close): " + port + " on host " + hostname);
                  }else{
                        System.out.println("Port (close): " + port + " on host " + hostname); }
                       
                }
               
        }

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