多态中的引用类型转换
代码
/javaDemo4/src/com/imooc/Animal.java
package com.imooc;
public class Animal {
}
/javaDemo4/src/com/imooc/Dog.java
package com.imooc;
public class Dog extends Animal {
}
/javaDemo4/src/com/imooc/Cat.java
package com.imooc;
public class Cat extends Animal {
}
Initail.java
package 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 ”);
}
}
}