java - How do I add different inner classes to an ArrayList? -


so, i'm building basic program based on warhammer 40k tabletop game credit assignment comp sci class. develop specs , implement specs. in game, have class army has arraylist of class units:

list<units> unitslist = new arraylist<units>();

i've created class units innerclasses contain different unit types. so, code snippet be: 

public class units  {    int strength, toughness, attacks, save, wounds;    class troopunit    {       public static final int strength = 3;       public static final int toughness = 3;       public static final int attacks = 1;       public static final int save = 5;        public int wounds = 1;    }     class elitetroopunit    {       public static final int strength = 3;       public static final int toughness = 3;       public static final int attacks = 1;       public static final int save = 4;        public int wounds = 1;    }  }

there more unit types, think can idea. i've tried adding these different innerclasses of units inside units arraylist:

public army(int trooppoints, int elitetrooppoints, int commandpoints,      int commandtrooppoints, int fastattackpoints, int heavyattackpoints) {          (int = 0; < (trooppoints/troop_cost); i++)       if (trooppoints % troop_cost == 0)        {          if (points < max_points)           {             unitslist.add(new units.troopunit());             points += troop_cost;             numunits++;          }       }    (int = 0; < (elitetrooppoints/elite_troop_cost); i++)       if (elitetrooppoints % elite_troop_cost == 0)        {          if (points < max_points)           {             unitslist.add(new units.elitetroopunit());             points += elite_troop_cost;             numunits++;          }       } }

however, run issue, because have declare , instantiate arraylist specific type of innerclass in order add inner class it. example, list<units.someunitinnerclass> unitslist = new arraylist<units.someunitinnerclass();

so, there workaround problem can add of innerclasses arraylist? going problem incorrectly? if so, other alternatives? thank you!

edit: had listed "how add different subclasses arraylist, mistake (corrected rudi kershaw).

in example code gave, troopunitand elitetroopunit not subtypes of unit. inner classes.

if want them subclasses of unit, need extend unit. example;

public class unit {} public class troopunit extends unit {}

in example above troopunit extends (and therefore subclass of) unit. quick glance, looks though add extends unit end of inner class declarations , should intend.

i hope helps.

references & further reading:


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