Question

I need a parent public abstract class which will have multiple child public static classes. I need only one instance of a Weapon class, a few static classes Bow, Sword< etc which extend the parent and can exist also only in one instance (at least I need to be able to get their static fiels). How to do it properly?

public abstract  class Weapon {
    ...
}
public static class Bow extends  Weapon { 
      static String type = "Bow ";
      static  int damage = 10;
}

public static class Sword extends  Weapon { 
      static String type = "Sword";
      static int damage = 10;
}

Getting error:

Illegal modifier for the class Sword; only public, abstract & final are permitted

---

I removed static and it worked:

public final class   Sword extends  Weapon { 
      static String type = "Sword";
      static int hitPointsTaken = 10;
}

---

I can compile this System.out.println( Sword.type ); but not this System.out.println( Weapon.Sword.type ); . Does it mean that I cannot access child through parent abstract?

Answer 1

If you absolutely have to implement this model, you’re looking at nesting:

public abstract  class Weapon {

    public static class Bow extends  Weapon { 
          static String type = "Bow ";
          static  int hitPointsTaken = 10;
    }
}