/**
  * Set the telef if the phone number parameter is valid.
  *
  * @param telef int
  * @throws Error if the number isn't valid
  */
 public void setTelef(int telef) {
   if (KeyboardInput.validateTelef(telef)) {
     this.telef = telef;
   } else {
     throw new Error();
   }
 }
  /** Set with a UI the personal data of a student but the name */
  public void setPersonalData() {

    while (true) {
      try {
        System.out.print("Student phone number: ");
        this.setTelef(KeyboardInput.intInput());
        break;
      } catch (Error e) {
        System.out.println("Error in number. It should have 9 digits");
      }
    }

    System.out.println("");
    System.out.print("Student street: ");
    this.setAdress(KeyboardInput.strInput());
    System.out.println("");
    System.out.print("Student adress number: ");
    this.setAdressNumber(KeyboardInput.intInput());
    System.out.println("");
    System.out.print("Student cp: ");
    this.setCp(KeyboardInput.intInput());
  }