新手求问啊

package com.imooc;

public class Initail {

 public static void main(String[] args) {
  // TODO Auto-generated method stub
  
      /* Dog dog=new Dog();
       dog.age=10;
       Dog dog2=new Dog();
       dog2.age=10;
       */
       Dog dog=new Dog();
       Animal animal=dog;
       Dog dog2=(Dog)animal;
       Cat cat=new Cat();
       if(animal instanceof Cat){
       Cat cat=(Cat)animal;
       }else{
        System.out.println("无法进行类型转换");
       }
 }}

package com.imooc;

public class Initail {

 public static void main(String[] args) {
  // TODO Auto-generated method stub
  
      /* Dog dog=new Dog();
       dog.age=10;
       Dog dog2=new Dog();
       dog2.age=10;
       */
       Dog dog=new Dog();
       Animal animal=dog;
       Dog dog2=(Dog)animal;
       Cat cat2=new Cat();
       if(animal instanceof Cat){
       Cat cat=(Cat)animal;
       }else{
        System.out.println("无法进行类型转换");
       }
 }}