import gnu.io.*;
import java.io.*;
import java.util.*;


public class TwoWaySerialComm
{
    public void arduinPort(){
    CommPort arduino = getArduinoPort();
    try {
        arduino.getOutputStream().write(1);
    } catch (IOException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
    }
    }
    public CommPort getArduinoPort() {
        @SuppressWarnings("rawtypes")
        Enumeration ports = CommPortIdentifier.getPortIdentifiers();
        while(ports.hasMoreElements()) {
            CommPortIdentifier identifier = (CommPortIdentifier) ports.nextElement();
            if(isArduino(identifier)) {
                try {
                    return identifier.open(getClass().getName(), 2000);
                } catch (PortInUseException e) {
                    // TODO Auto-generated catch block
                    e.printStackTrace();
                } // 2 second timeout
            }
        }
        return null;
    }

    public boolean isArduino(CommPortIdentifier identifier) {

        if (identifier.getName()== "COM3"){
            return true;
        }
        else{
            return false;
        }
        // if you know the name of the port ahead of time you can
        // compare it here with identifier.getName(), otherwise
        // you can interface with the user like the Arduino IDE's
        // serial monitor

}

}