eatabledemo.java

Java 程序设计源码 只提供了部分

interface Eatable {
	public void howToEat();
}

class Animal implements Eatable {
	public void howToEat() {
		System.out.println("Animal eatable");
	}
}

class Tiger extends Animal {
	public void howToEat() {
		System.out.println("Tiger eatable");
	}

	public String toString() {
		return "Tiger";
	}
}

class Elephant extends Animal {
	public void howToEat() {
		System.out.println("Elephant eatable");
	}

	public String toString() {
		return "Elephant";
	}
}

class Chilken extends Animal {
	public void howToEat() {
		System.out.println("Chilken is eatable");
	}

	public String toString() {
		return "Chilken";
	}
}

class Friut implements Eatable {
	public void howToEat() {
		System.out.println("Friut is eatable");
	}	
}

class Apple extends Friut {
	public void howToEat() {
		System.out.println("Apple is eatable");
	}

	public String toString() {
		return "Apple";
	}
}

class Orange extends Friut {
	public void howTeat() {
		System.out.println("Orange is eatable");
	}

	public String toString() {
		return "Orange";
	}
}	

public class EatableDemo {
	public static void main(String[] args) {
		Tiger t = new Tiger();
		Chilken c = new Chilken();
		Apple a = new Apple();
		Orange o = new Orange();

		showOb(t);
		showOb(c);
		showOb(a);
		showOb(o);
		
	}

	public static void showOb(Object object) {
		System.out.println(object);

		if(object instanceof Eatable)
			((Eatable)object).howToEat();
	}
}