如何将枚举分配给派生类

// 定义一个枚举类型
enum Fruit {
  APPLE,
  ORANGE,
  BANANA
}

// 定义一个基类
class Food {
  protected Fruit fruit;

  public void setFruit(Fruit fruit) {
    this.fruit = fruit;
  }

  public void eat() {
    System.out.println("Eating " + fruit);
  }
}

// 定义一个派生类
class Juice extends Food {
  public void drink() {
    System.out.println("Drinking " + fruit);
  }
}

public class Main {
  public static void main(String[] args) {
    Juice juice = new Juice();
    juice.setFruit(Fruit.APPLE);
    juice.drink(); // 输出：Drinking APPLE
    juice.eat(); // 输出：Eating APPLE
  }
}