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class Animal { } class Mammal extends Animal { } class Reptile extends Animal { } public class Dog extends Mammal { public static void main(String args[]) { Animal a = new Animal(); Mammal m = new Mammal(); Dog d = new Dog(); System.out.println(m instanceof Animal); System.out.println(d instanceof Mammal); System.out.println(d instanceof Animal); } }
运行结果 :
正在执行...
