彩笔笔记2016/12/1——多态

//新手笔记提醒

public abstract class Animal {
  public abstract void call();
}
----------------------------
public class Dog extends Animal{

  @Override
  public void call() {
    // TODO Auto-generated method stub
    System.out.println("wangwang");
  }
  public void ear(){
    System.out.println("chigutou");
  }

 }
public class Test {
  public static void main(String[]args){
    Animal an=new Dog();                                 //由Animal提供方法，由Dog实现
    an.call();
    an.eat();                                                        //Animal没有eat()方法，所以会报错
  }
}