testpoly.java

与java有关的相关练习题目

public class TestPoly{
	public static void main(String[] args){
		//Animal a=new Dog();
		feed(new Dog());
		Animal a=getAnimal(0);
		a.eat();
	}
	/*
	static void feed(Dog d){
		d.eat();	
	}
	static void feed(Cat c){
		c.eat();	
	}
	*/
	static void feed(Animal a){
		a.eat();
	}
	static Animal getAnimal(int type){
		if (type==0) return new Dog();
		else return new Cat();
	}
}
class Animal{
	public void eat(){}
}
class Dog extends Animal{
	public void eat(){}
}
class Cat extends Animal{
	public void eat(){}
}