abstract class Animal{

String name;

public abstract void walk();

public abstract void eat();}


class Goat extends Animal{

public void walk(){

System.out.println("羊在跑");

}

public void eat(){

System.out.println("羊吃草！");

}

}

class Wolf extends Animal{

public void walk(){

System.out.println("羊在跑");

}

public void eat(){

System.out.println("狼在跑！");

}