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// 1. 抽象类 Animal
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abstract class Animal { |
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// 抽象方法:动物叫
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public abstract void makeSound(); |
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} |
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// 2. 接口 Swimmable
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interface Swimmable { |
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// 游泳方法
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void swim(); |
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} |
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// 3. Dog 类:继承Animal,实现Swimmable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("狗叫: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("狗会游泳,正在刨水🏊♂️"); |
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} |
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} |
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// 4. Cat 类:只继承Animal,不实现Swimmable
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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("猫叫:喵喵喵 🐱"); |
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} |
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} |
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// 5. 主类(必须public,和文件名一致)
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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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// 调用叫声方法
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System.out.println("=== 动物叫声测试 ==="); |
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dog.makeSound(); |
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cat.makeSound(); |
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// 测试游泳接口:只有Dog实现了Swimmable
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System.out.println("\n=== 游泳能力测试 ==="); |
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if (dog instanceof Swimmable) { |
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((Swimmable) dog).swim(); |
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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("猫不会游泳,只能在边上看着~"); |
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} |
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} |
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} |
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