How to handle Host and Port Cases, when we creat a Client API

Hello folks,
i am trying to creat Connection to Elasticsearch using Client API, and i want to handle Cases , if the Host is not existing or unknown or the Port ist wrong or not existing or empty,
how to write that in java ,
here is my Start,

try {
 client = new PreBuiltTransportClient(Settings.EMPTY)
                .addTransportAddress(new TransportAddress(InetAddress
                        .getByName("localhost"), 9300));
} catch (UnknownHostException ex) {                               
            System.out.println("faild host " + ex.getMessage());
        }catch(UnknownTransportNummber nr){
            System.out.println("faild port" + nr.getMessage());

i want to check and handle the localhost , and PortNummber, is there any tutorial or Advice how to do that??
I found "UnknownHostException" to handle the Host error , is there any Exception to handle the Port error something like "UnknownTransportNummber " or "UnknownPort" ??

Not sure. But anyway don't use the TransportClient as it's removed in the coming 8.0 version.

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