testedible.java

很好的程序欢迎大家来下载。初学者很有用的。

public class TestEdible {
  public static void main(String[] args) {
    Object[] objects = {new Tiger(), new Chicken(), new Apple()};
    for (int i = 0; i < objects.length; i++)
      showObject(objects[i]);
  }

  public static void showObject(Object object) {
    if (object instanceof Edible)
      System.out.println(((Edible)object).howToEat());
  }
}

class Fruit implements Edible {
  public String howToEat() {
    return "Eat it fresh";
  }
}

class Apple extends Fruit {
  public String howToEat() {
    return "Make apple cider";
  }
}

class Orange extends Fruit {
  public String howToEat() {
    return "Make orange juice";
  }
}

class Animal {
}

class Chicken extends Animal implements Edible {
  public String howToEat() {
    return "Fry it";
  }
}

class Tiger extends Animal {
}