为什么我不能将其他类的常量添加到 java 中的 switch 语句中

为什么我不能在java的switch语句中添加其他类的常量？

我有一节课

public class Game {


    static class GameMode {
        public static final GameMode SURVIVAL = new GameMode();
        public static final GameMode ADVENTURE = new GameMode();
        public static final GameMode GOD = new GameMode();
    }

    GameMode CurrentMode = GameMode.GOD;

}

但当我定义switch语句时，它会给我一个错误:

    void OnGame(){
        switch (CurrentMode){
            case GameMode.GOD: // case expressions must be constant expressionsJava(536871065)
                System.out.println("Player On God Mode");
                break;
            case GameMode.SURVIVAL: // case expressions must be constant expressionsJava(536871065)
                System.out.println("Player On Survival Mode");
                break;
            case GameMode.ADVENTURE: // case expressions must be constant expressionsJava(536871065)
                System.out.println("Player On Adventure Mode");
                break;


        }
    }

这让我很困惑.生存、冒险和god 模式都是不变的，我在前面加上"final"，为什么我不能在switch语句中使用它呢？

Here are some image: