Tournament.java

public class Tournament {

  public boolean register(String teamName) {

    if (!isAlreadyRegistered(teamName)) {

      // register team

      return true;
    }
    return false;
  }

  public boolean isAlreadyRegistered(String teamName) {
    throw new RuntimeException("I'm not supposed to be executed");
  }

  public static void main(String[] args) throws Exception {
    Tournament tournament = new Tournament();
    tournament.register("e-LEMON-ators");
  }

}