Class.newInstance() how to use a method?

Question

I created an abstract class as follows:

abstract class Chance
{

   public void setTeams(SportEvent aSportEvent)
   {
      firstTeam = aSportEvent.getFirstTeam();
      secondTeam = aSportEvent.getSecondTeam();
   }


   private int totalPlayedGames()
   {
      int playedAtHome = firstTeam.getHomePlayedGames();
      int playedAway = secondTeam.getAwayPlayedGames();
      int playedGames = playedAtHome + playedAway; 
      return playedGames;
   }


   private int totalScoredGoals()
   {
      int homeScoredGoals = firstTeam.getHomeScoredGoals();
      int awayScoredGoals = secondTeam.getAwayScoredGoals();
      int scoredGoals = homeScoredGoals + awayScoredGoals; 
      return scoredGoals;
   }

   abstract double getChance()

   Team firstTeam;
   Team secondTeam; 
}

Then, of course, I have several classes with the method getChance() ...

Now, I wanted to create a class in which I can get the result of getChance() of these new classes. I thought to use something like:

Class aClass = Class.forName(chanceClass....);
Object obj = aClass.newInstance();

and now I would like to use the 'getChance()' method.

How can I do it?

Answer 1

You can simply cast it:

Chance obj = (Chance) aClass.newInstance();
double d = obj.getChance();

Answer 2

Without casting:

Class<? extends Chance> aClass = Class.forName(chanceClass....).asSubclass(Chance.class); 
Chance obj = aClass.newInstance();
double d = obj.getChance();