java入门第二季--多态--多态中的引用类型转换

多态中的引用类型转换代码/javaDemo4/src/com/imooc/Animal.javapackage com.imooc;public class Animal { }/javaDemo4/src/com/imooc/Dog.javapackage com.imooc;public class Dog extends Animal {}/javaDemo4/src/com/imooc/Cat.javapackage com.imooc;public class Cat extends Animal {}Initail.javapackage com.imooc;public class Initail { public static void main(String[] args) { Dog dog = new Dog(); Animal animal = dog; //自动类型提升，向上类型转换 Dog dog2 = (Dog)animal; //向下类型转换 强制类型转型 if(animal instanceof Cat) { Cat cat = (Cat)animal; }else { System.out.println(“无法进行类型转换”); } }}