using System;

public abstract class Vessel {
  private Plant its_plant = null;
  private Weapon its_weapon = null;
  private String its_name = null;
  
  // protected properties
  protected Weapon Weapon { 
    get { return its_weapon; }
  }
  
  protected Plant Plant { 
    get { return its_plant; }
  }
  
  public Vessel(Plant plant, Weapon weapon, String name){
    its_weapon = weapon;
    its_plant = plant;
    its_name = name;
    Console.WriteLine("The vessel " + its_name + " created!");
  }
  
  /* ********************************************************
      Public Abstract Methods - must be implemented in
      derived classes.
  *********************************************************/
  public abstract void LightoffPlant();
  public abstract void ShutdownPlant();
  public abstract void TrainWeapon();
  public abstract void FireWeapon();
  
  /* ********************************************************
      ToString() Method - may be overridden in subclasses.
  *********************************************************/
  public override String ToString(){
    return "Vessel name: " + its_name + " " + its_plant.ToString() +
            " " + its_weapon.ToString();
  }
  

}// end Vessel class definition