Learn/LearnJava/Jb31_ObjPol.java

public class Jb31_ObjPol
{
	//<2F><><EFBFBD><EFBFBD><EFBFBD>Ķ<EFBFBD>̬<EFBFBD><CCAC>;<3B><><EFBFBD><EFBFBD><EFBFBD>е<EFBFBD><D0B5><EFBFBD><EFBFBD>־<EFBFBD><D6BE>Ǹ<EFBFBD><C7B8><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ӿڵ<D3BF><DAB5><EFBFBD><EFBFBD><EFBFBD>ָ<EFBFBD><D6B8><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>Ķ<EFBFBD><C4B6><EFBFBD>
	public static void main(String[] args) 
	{
		/*<EFBFBD>Զ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>(<EFBFBD><EFBFBD><EFBFBD><EFBFBD>ת<EFBFBD><EFBFBD>)<EFBFBD><EFBFBD>è<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>Ϊ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>.<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>й<EFBFBD><EFBFBD><EFBFBD><EFBFBD>޷<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
		<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ƶ<EFBFBD><EFBFBD><EFBFBD><EFBFBD>й<EFBFBD><EFBFBD>ܵķ<EFBFBD><EFBFBD><EFBFBD>*/
		Animal a = new Cat();	
		a.eat();
		//<2F><><EFBFBD><EFBFBD><EFBFBD><EFBFBD>Ҫʹ<D2AA><CAB9>è<EFBFBD><C3A8><EFBFBD><EFBFBD><EFBFBD>ù<EFBFBD><C3B9>ܣ<EFBFBD><DCA3>ɽ<EFBFBD><C9BD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ת<EFBFBD><D7AA>
		//<2F><>ʼ<EFBFBD><CABC><EFBFBD>ն<EFBFBD><D5B6><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>͵ı任
		Cat c = (Cat)a;	//<2F><><EFBFBD><EFBFBD>ת<EFBFBD><D7AA>Ŀ<EFBFBD><C4BF><EFBFBD><EFBFBD>Ϊ<EFBFBD><CEAA>ʹ<EFBFBD><CAB9><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>÷<EFBFBD><C3B7><EFBFBD>
		c.eat();
		c.catch();
		/*
		Cat c = new Cat();
		//Dog d = new Dog();
		//c.eat();
		method(c);
		method(new Dog());
		*/
		method(new Cat());
	}
	/*<EFBFBD><EFBFBD>̬<EFBFBD>ô<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ߴ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>չ<EFBFBD>ԣ<EFBFBD>ǰ<EFBFBD>涨<EFBFBD><EFBFBD><EFBFBD>Ĵ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ʹ<EFBFBD>ú<EFBFBD><EFBFBD>ڵ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
	<EFBFBD>׶ˣ<EFBFBD>ǰ<EFBFBD>ڶ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ݲ<EFBFBD><EFBFBD><EFBFBD>ʹ<EFBFBD>ã<EFBFBD><EFBFBD><EFBFBD><EFBFBD>ã<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
	ʹ<EFBFBD>ö<EFBFBD>̬ǰ<EFBFBD>᣺<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>й<EFBFBD>ϵ<EFBFBD><EFBFBD><EFBFBD>̳С<EFBFBD>ʵ<EFBFBD><EFBFBD>
	Ҫ<EFBFBD>з<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
	
	*/
	public static void method(Animal a)
	{
		a.eat();
		if (a instanceof Cat)
		//instanceof <20><><EFBFBD><EFBFBD><EFBFBD>ж϶<D0B6><CFB6><EFBFBD><EFBFBD>ľ<EFBFBD><C4BE><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ͣ<EFBFBD>ֻ<EFBFBD><D6BB><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ж<EFBFBD>
		//ͨ<><CDA8><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ת<EFBFBD><D7AA>ǰ<EFBFBD><C7B0><EFBFBD>ڽ<EFBFBD>׳<EFBFBD>Ե<EFBFBD><D4B5>ж<EFBFBD>
		{
			Cat c2 = (Cat)a;
			c2.catch();
		}
		else if (a instanceof Dog)
		{
			Dog d2 = (Dog)a;
			d2.watchHome();
		}
		
	}
}

abstract class Animal
{
	abstract void eat();
}

class Dog extends Animal
{
	public void eat()
	{
		System.out.println("<22><>ʺ");
	}
	public void watchHome()
	{
		System.out.println("<22><><EFBFBD><EFBFBD>");
	}
}

class Cat extends Animal
{
	public void eat()
	{
		System.out.println("<22><><EFBFBD><EFBFBD>");
	}
	public void catch()
	{
		System.out.println("׽<><D7BD><EFBFBD><EFBFBD>");
	}
}