PortScanner.java | Basic Port Scanner

import java.net.*;
import java.util.*;
import java.io.*;
import static java.lang.System.out;
public class PortScanner
{
    public static void main(String args[])throws IOException
    {
        BufferedReader br=new BufferedReader(new InputStreamReader(System.in));
        out.print("HostName: ");
        String host=br.readLine();
        InetAddress address=null;
        try
        {
            address = InetAddress.getByName(host);
        }
        catch(UnknownHostException uhe)
        {
            out.print("[-] Could not find host.");
            System.exit(0);
        }
        out.print("Ports (separated by commas): ");
        String portstring = br.readLine();
        StringTokenizer ports = new StringTokenizer(portstring,",");
        out.println("[*] Scan results for "+host+" ("+address.getHostAddress()+"):");
        while(ports.hasMoreTokens())
        {
            int port = 0;
            try{
                port = Integer.parseInt(ports.nextToken());
                Socket conn=new Socket();
                conn.connect(new InetSocketAddress(host,port),1000);
                conn.close();
                out.println("\t[+] "+port+"/tcp open");
            }
            catch(SocketTimeoutException ste)
            {
                out.println("\t[-] "+port+"/tcp closed");
            }
        }

    }
}