elementary Port scanner

package com.isga.isi.reseaux;

import java.net.InetAddress;
import java.net.InetSocketAddress;
import java.net.Socket;
import java.net.UnknownHostException;

public class PortScanner {
    public static boolean portIsOpen(String ip, int port, int timeout) {
        try {
            Socket socket = new Socket();
            InetSocketAddress hote=new InetSocketAddress(ip, port);
            socket.connect(hote, timeout);
            socket.close();
            return true;
        } catch (Exception ex) {
            return false;
        }
    }

    public static void main(String[] args) {
        final int DEBUT=0;
        final int FIN=10_000;
        final int TIMEOUT=10;
        if(args.length==0) {
            System.out.println("Argument absent");
            System.out.println("Il faut fournir l'adresse du site à scanner");
            System.exit(-1);

        }
        InetAddress hote=null;

        try {
             hote=InetAddress.getByName(args[0]);

        } catch (UnknownHostException e) {
            System.out.println("Argument incorrect");
            System.out.println("Il faut fournir une adresse valable");
            System.exit(-1);

        }
        int i;
        for(i=DEBUT; i<=FIN; i++) {
             if(portIsOpen(hote.getHostName(), i, TIMEOUT)) {
                 System.out.println("Port "+i+ " ouvert.");
             }
        }


        }



    }