[Dreamwalker]

Code:

import java.net.*;
import java.io.IOException;
import java.util.Scanner;



public class JScan implements Runnable {




public static void main(String[] args) {
new JScan();
}

public JScan(){
new Thread(this).start();
}

public void run()
{
String host;
int start_port, end_port;
Scanner input = new Scanner(System.in);

System.out.println("_________________________________");
System.out.println("Port Scanner coded by DreamWalker");
System.out.println(" ");
System.out.println("_________________________________\n");

System.out.print("Target host or IP?: "); host = input.nextLine();
System.out.print("Start port?: "); start_port = input.nextInt();
System.out.print("End port?: "); end_port = input.nextInt();
    
System.out.println("________________________________\nScanning...\n");
  for (int current_port = start_port; current_port <= end_port; current_port++)
   try {
        
         Socket socket = new Socket();
         socket.bind(null);
         socket.connect(new InetSocketAddress(host, current_port), 250);
         socket.close();
            
            if(current_port == 21)
            System.out.println("FTP is open "+current_port);
            else if(current_port == 22)
            System.out.println("SSH is open "+current_port);    
            else if(current_port == 23)
            System.out.println("Telnet is open "+current_port);    
            else if(current_port == 25)
            System.out.println("SMTP is open "+current_port);
            else if(current_port == 80)
                        System.out.println("HTTP is open "+current_port);
            else if(current_port == 110)
            System.out.println("POP3 is open "+current_port);
            else if(current_port == 143)
            System.out.println("IMAP is open "+current_port);
            else if(current_port == 443)
            System.out.println("SSL/HTTPS is open "+current_port);
            else if(current_port == 3389)
            System.out.println("RDP is open "+current_port);
            else if(current_port == 5900)
            System.out.println("VNC is open "+current_port);
            else System.out.println("Port open "+current_port);

        } catch (IOException ex) {}
     System.out.println("_________________________________\nFinished, please close.");
    
        try {
              System.in.read();
            } catch (IOException e)
              {
               e.printStackTrace();
              }
        
    }

}

[Deque]

Adhere to the Java coding conventions: Take care for proper intendation, put each statement on a new line, use correct variable names:

this_is_not_a_java_variable
butThisIs

Use a map for the port-to-name mappings or at least a switch case statement, which looks much cleaner than an if-else-if-... construction.

Why do you use a thread?

[Dreamwalker]

Adhere to the Java coding conventions: Take care for proper intendation, put each statement on a new line, use correct variable names:

this_is_not_a_java_variable
butThisIs

Use a map for the port-to-name mappings or at least a switch case statement, which looks much cleaner than an if-else-if-... construction.

Why do you use a thread?

It's something I wrote in 5 mins and is sufficient for what I needed... and the extra thread was to create a seperate stack memory on the scan for stability and speed.

[Deque]

Adhere to the Java coding conventions: Take care for proper intendation, put each statement on a new line, use correct variable names:

this_is_not_a_java_variable
butThisIs

Use a map for the port-to-name mappings or at least a switch case statement, which looks much cleaner than an if-else-if-... construction.

Why do you use a thread?

It's something I wrote in 5 mins and is sufficient for what I needed... and the extra thread was to create a seperate stack memory on the scan for stability and speed.

Well, you published it.
Also the conventions are something you should make a habit of, so you don't even have to think about them, 5 minutes or not.
Using a single thread for stability and speed doesn't make sense at all. If you used several threads it would probably be of some use for the speed, but not like this.

[Ex094]

You should really consider posting in some working screen shots of your program