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// 抽象类:动物
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abstract class Animal { |
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// 抽象方法:动物叫声
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public abstract void makeSound(); |
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} |
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// 接口:具备游泳能力
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interface Swimmable { |
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void swim(); |
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} |
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// 狗类:继承动物,实现游泳接口
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class Dog extends Animal implements Swimmable { |
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@Override |
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public void makeSound() { |
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System.out.println("Dog: 汪汪汪"); |
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} |
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@Override |
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public void swim() { |
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System.out.println("Dog 正在游泳"); |
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} |
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} |
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// 猫类:仅继承动物
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class Cat extends Animal { |
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@Override |
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public void makeSound() { |
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System.out.println("Cat: 喵喵喵"); |
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} |
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} |
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// 测试类
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public class AnimalTest { |
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public static void main(String[] args) { |
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// 多态:父类引用指向子类对象
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Animal dog = new Dog(); |
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Animal cat = new Cat(); |
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// 测试叫声
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dog.makeSound(); |
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cat.makeSound(); |
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// 测试游泳(仅狗实现了接口)
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if (dog instanceof Swimmable) { |
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((Swimmable) dog).swim(); |
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} else { |
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System.out.println("该动物不会游泳"); |
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} |
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if (cat instanceof Swimmable) { |
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((Swimmable) cat).swim(); |
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} else { |
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System.out.println("Cat 不会游泳"); |
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} |
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} |
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} |
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