package strategy; /** * @author ： CodeWater * @create ：2022-06-24-17:31 * @Function Description ： */ public abstract class Duck { public Duck() { } public abstract void display();//显示鸭子信息 public void quack() { System.out.println("鸭子嘎嘎叫~~"); } public void swim() { System.out.println("鸭子会游泳~~"); } public void fly() { System.out.println("鸭子会飞翔~~~"); } }