Java 多态 继承 断藕内存分析图

client 

--------------------------

public class Client{
public static void main(String[] args){
Person p = new Person();
Dog d = new Dog();
Cat c = new Cat();

//Animal a = new Animal();
//Animal a = new Dog();//父类的引用指向子类的对象

p.feed(d);//方法的形参和实参也可以多态,形参声明的时候是父类的引用,但是实参传值的时候是子类对象的吧
p.feed(c);

}
}

person

----------------------------

public class Person{

public void feed(Animal a){
a.eat();
}

}

Animal

---------------------------------

public class Animal{
public void eat(){
}

}

dog

--------------------------

public class Dog extends Animal{
//Method
public void eat(){
System.out.println( "狗吃肉" );
}
}

cat

-----------------------------

public class Cat extends Animal{
//Method
public void eat(){
System.out.println( "猫吃鱼" );
}

}

Java 多态 继承 断藕内存分析图

原文：http://www.cnblogs.com/wunian7yulian/p/4364497.html