java 重写的学习

public class test {

/**
* @param args
*/
public static void main(String[] args) {
Animal animal = new Animal();
Animal dog = new Dog();

animal.say();
dog.say();

animal.eat(animal);
dog.eat(dog);

System.out.println(animal.info());
System.out.println(dog.info());
}
}

class Animal {
private String name = "Animal";

protected void say() {
System.out.println("Animal" + " " + this.name);
}

public void eat(Animal food) {
System.out.println("Animal eat " + food);
}

public Object info() {
return "Animal";
}

@Override
public String toString() {
return "Animal";
}
}

class Dog extends Animal {
private String name = "Dog";

@Override
public final void say() {
System.out.println("Dog" + " " + this.name);
}

@Override
public final void eat(Animal food) {
super.eat(food);

System.out.println("Dog eated");
}

@Override
public final String info() {
return "Dog";
}

@Override
public final String toString() {
return "Dog";
}
}