为什么我这样写 自动生成的是Animal other = (Animal) obj;转换成Animal类 而不是转换为Dog类

package test;

public class Animal {

int age;

String shout;

String name;

String eat;

public void a1(){

System.out.println("这只"+name+"年龄大概是"+age+"它的叫声是"+shout+"它们主要吃"+eat);

}

public class Dog extends Animal{

String kind;

public void a1() {

System.out.println("这只"+name+"年龄大概是"+age+"它的叫声是"+shout+"它们主要吃"+eat+"它们总是让人感觉很"+kind);

}

}

public static void main(String[] args) {

Animal a = new Animal();

Dog p1 = a.new Dog();

Dog p2 = a.new Dog();

if(p1.equals(p2)) {

System.out.println("两个对象相同;");

}

else {

System.out.println("两个对象不同;");

}

p1.age= 5;

p1.name= "小狗";

p1.shout= "汪汪汪";

p1.eat = "肉、蔬菜";

p1.kind = "友好";

//p1.a1();

//System.out.println(p1);

}

@Override

public boolean equals(Object obj) {

if (this == obj)

return true;

if (obj == null)

return false;

if (getClass() != obj.getClass())

return false;

Animal other = (Animal) obj;

if (age != other.age)

return false;

if (eat == null) {

if (other.eat != null)

return false;

} else if (!eat.equals(other.eat))

return false;

if (name == null) {

if (other.name != null)

return false;

} else if (!name.equals(other.name))

return false;

if (shout == null) {

if (other.shout != null)

return false;

} else if (!shout.equals(other.shout))

return false;

return true;

}

}