Ketai library, KetaiNet.getIP(); Error

Processing for Android
11

@akenaton

This is ‘Ketai library source code’.

static public String getIP() {
String thing = “0.0.0.0”;

try {
  for (Enumeration<NetworkInterface> en = NetworkInterface
      .getNetworkInterfaces(); en.hasMoreElements();) {
    NetworkInterface intf = en.nextElement();
    for (Enumeration<InetAddress> enumIpAddr = intf
        .getInetAddresses(); enumIpAddr.hasMoreElements();) {
        InetAddress inetAddress = enumIpAddr.nextElement();
      if (!inetAddress.isLoopbackAddress()
          && thing == "0.0.0.0"
          && inetAddress.getHostAddress().matches(
              "\\b(?:\\d{1,3}\\.){3}\\d{1,3}\\b")) {
        thing = inetAddress.getHostAddress();
      }
       PApplet.println("IP address: " + inetAddress.getHostAddress());
       PApplet.println("thing : " + thing);
    }
  }
} catch (SocketException ex) {
  PApplet.println("SocketException:" + ex.toString());
} catch (NullPointerException nx) {
  PApplet.println("Failed to get any network interfaces...");
}

       //PApplet.println("IP address: " + inetAddress.getHostAddress());
       //PApplet.println("thing : " + thing);
return thing;

}

The source code has been modified as shown below.

// && thing == “0.0.0.0”

I do not know the exact reason. ;;
The obvious thing is that there is an error in the Android 9.0 version of the smartphone.