Java: Getting data RFID Serial Rs232 in JFrame Class

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Java

Swing

serial-port

RFID

**Getting data on from rfid scanner as Serial rs232 port in JFrame**, in this case I have made a JFrame form and I have a JTextField for storing data rfid as a String. Actually, I found a class from internet that read the RFID reader as byte, now How To get data from my RFID Class to my JTextfield Jframe in my main class as String?

Here my RFID class :

package view;

import java.util.*;
import java.io.*;
import javax.comm.*;

public class ListPorts implements Runnable, SerialPortEventListener {
    static CommPortIdentifier portId;
    static Enumeration portList;
    
    InputStream inputStream;
    SerialPort serialPort;
    Thread readThread;
    
    public static void main(String[] args) {
        portList = CommPortIdentifier.getPortIdentifiers();
    
        while (portList.hasMoreElements()) {
            portId = (CommPortIdentifier) portList.nextElement();
            if (portId.getPortType() == CommPortIdentifier.PORT_SERIAL) {
                 if (portId.getName().equals("COM30")) {
            //                if (portId.getName().equals("/dev/term/a")) {
                    ListPorts reader = new ListPorts();
                }
            }
        }
    }
    
    public ListPorts() {
        try {
            serialPort = (SerialPort) portId.open("SimpleReadApp", 2000);
        } catch (PortInUseException e) {System.out.println(e);}
        try {
            inputStream = serialPort.getInputStream();
        } catch (IOException e) {System.out.println(e);}
    try {
            serialPort.addEventListener(this);
    } catch (TooManyListenersException e) {System.out.println(e);}
        serialPort.notifyOnDataAvailable(true);
        try {
            serialPort.setSerialPortParams(9600,
                SerialPort.DATABITS_8,
                SerialPort.STOPBITS_1,
                SerialPort.PARITY_NONE);
        } catch (UnsupportedCommOperationException e) {System.out.println(e);}
        readThread = new Thread(this);
        readThread.start();
    }
    
    public void run() {
        try {
            Thread.sleep(20000);
        } catch (InterruptedException e) {System.out.println(e);}
    }
    
    public void serialEvent(SerialPortEvent event) {
        switch(event.getEventType()) {
        case SerialPortEvent.BI:
        case SerialPortEvent.OE:
        case SerialPortEvent.FE:
        case SerialPortEvent.PE:
        case SerialPortEvent.CD:
        case SerialPortEvent.CTS:
        case SerialPortEvent.DSR:
        case SerialPortEvent.RI:
        case SerialPortEvent.OUTPUT_BUFFER_EMPTY:
            break;
        case SerialPortEvent.DATA_AVAILABLE:
            byte[] readBuffer = new byte[20];
    
            try {
                while (inputStream.available() > 0) {
                    int numBytes = inputStream.read(readBuffer);
                }
                System.out.print(new String(readBuffer)); // I Have to get this data to my Jtextfield
            } catch (IOException e) {System.out.println(e);}
            break;
        }
    }
}