serialPort = (SerialPort) portId.open("SimpleReadApp", 2000) opens COM1 serial port identified in the following code segment 
        while (portList.hasMoreElements()) {
            portId = (CommPortIdentifier) portList.nextElement();
            if (portId.getPortType() == CommPortIdentifier.PORT_SERIAL) {
                if (portId.getName().equals("COM1")) {
		System.out.println("The port is: " + portId.getName());
              
                    RFIDTagRead reader = new RFIDTagRead();
                }
            }
        }

Example 1: Opening COM1.