safe lazy initialization example

UDPclient.java

public class UDPClient {
    private static final String TAG = UDPClient.class.getSimpleName();

    private static class Holder{
        public static UDPClient udpClient = new UDPClient();
    }

    public static UDPClient getUdpClient() {
        return Holder.udpClient;
    }
  
}