why jTextArea.setText(); only show latest value?

Question

So i was tried to show data from server to gui jTextArea.setText() for every receive data from server but it only show the latest value.

So this is code from class A:

while (true) {
                String receivedCommand = bufferedReader.readLine();
                if (receivedCommand != null) {
                    this.commandFromServer = receivedCommand;
                    sendCommand(this.commandFromServer);
  
                    bufferedWriter.write("Accepted Command");
                    bufferedWriter.newLine();
                    bufferedWriter.flush();

                    if (receivedCommand.equalsIgnoreCase("Disconnect")) {
                        break;
                    }
                }
            }

public void sendCommand(String command) {
        MainFrame.getCommandFromServer(command);
    }

and this is code from class B:

public static void getCommandFromServer(String command){
        System.out.println(command);
        chatReceiveText.setText(command);
  
    }

the print out is working as it show the response on console but for textArea.setText is not working as i am expected as it only show latest values after loop is break, how can textArea can set text based on server response?