java - 如何强制属性等于常量值之一(在 Java 中)？

Question

我有一个类Game，其属性为“status”，该属性只是“player”或“coach”，我该怎么做？我会告诉你我是如何尝试的

class Status{
   public static final String player = "player";
   public static final String coach = "coach";
}
class Game {
   String status;
   Game(String status){
     this.status = status;
   }
}
class Main{
   public static void main(String args[]){
     new Game(Status.player);
     new Game(Status.coach);
   }
}

谢谢

Answer 1

使用枚举

public class Game {
   public enum Status { PLAYER, COACH };
   private Status status;
   public Game(Status status){
     this.Status = status;
   }

public static void main(String args[]){
     new Game(Status.PLAYER);
     new Game(Status.COACH);
   }
}