点击运行
class Animal { public void move() { System.out.println("Animals can move"); } } class Dog extends Animal { public void move() { System.out.println("Dogs can walk and run"); } public void bark() { System.out.println("Dogs can bark"); } } public class TestDog { public static void main(String args[]) { Animal a = new Animal(); Animal b = new Dog(); a.move(); b.move(); b.bark(); } }
运行结果 :
正在执行...