import gnu.io.CommPortIdentifier;
import java.util.Enumeration;

public class Test {
  public static void main(String[] args) {
    System.out.println("main method start.");
    try {
      Enumeration portList = CommPortIdentifier.getPortIdentifiers();
      CommPortIdentifier port = null;
      while (portList.hasMoreElements()) {
        port = (CommPortIdentifier)portList.nextElement();
        System.out.println(port.getName());
      }
    } catch(Exception e) {
      e.printStackTrace();
    }
  }
}