private void printHelp() {
    System.out.println("\nExample of using command line parameters:\n");
    System.out.println("  run server instance");
    System.out.println("    java -jar Test7bioz.jar -s");
    System.out.println("  run client instance");
    System.out.println("    java -jar Test7bioz.jar -c");
    System.out.println("  run client instance, 10 calls to the server on 192.168.10.1");
    System.out.println("    java -jar Test7bioz.jar -c 10 192.168.10.1");
  }