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How to take a port # from KB to use as ServerSocket port in Java WebServers. Example code better?

Confused with how to use BufferedReader and insert the entered port as the ServerSocket port no.

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1. BufferedReader stdin = new BufferedReader( new InputStreamReader(System.in)); int port= -1; while(port == -1){ try { String portText = stdin.readLine();//returns when hit "Enter" port = Integer.parseInt(portText); } catch (NumberFormatException nfe) { System.out.println("Must be digits!"); System.out.println("Try again..."); } }//end while ServerSocket ss = new ServerSocket(port);