Class.newInstance（）如何使用方法？

Question

我創建了一個抽象類，如下所示：

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; 
}

然后，當然，我有幾個使用getChance()方法的類...

現在，我想創建一個類，在其中可以獲取這些新類的getChance()結果。 我想使用類似：

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

現在我想使用'getChance（）'方法。

我該怎么做？

Answer 1

您可以簡單地將其轉換為：

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

Answer 2

不強制轉換：

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