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57 lines
1.5 KiB
57 lines
1.5 KiB
// 1. 创建抽象类 Animal
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abstract class Animal {
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// 包含抽象方法 makeSound()
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public abstract void makeSound();
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}
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// 2. 创建接口 Swimmable
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interface Swimmable {
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// 包含方法 swim()
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void swim();
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}
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// 3. 创建 Dog 类继承 Animal 并实现 Swimmable
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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 (Woof Woof)");
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}
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@Override
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public void swim() {
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System.out.println("Dog: 狗狗正在游泳 (Dog is swimming)");
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}
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}
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// 4. 创建 Cat 类继承 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("Cat: 喵喵喵 (Meow Meow)");
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}
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}
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// 5. 主类用于测试
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public class AnimalTest {
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public static void main(String[] args) {
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// --- 测试 Dog ---
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// 多态调用：父类引用指向子类对象
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Animal myDog = new Dog();
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myDog.makeSound(); // 调用 Dog 的叫声
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// 因为 myDog 是 Animal 类型，无法直接调用 swim，需要向下转型或使用接口引用
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// 这里演示接口多态
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Swimmable swimmingDog = new Dog();
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swimmingDog.swim(); // 调用 Dog 的游泳方法
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System.out.println("----------------");
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// --- 测试 Cat ---
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Animal myCat = new Cat();
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myCat.makeSound(); // 调用 Cat 的叫声
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// 注意：Cat 不能转换为 Swimmable，否则会报 ClassCastException
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}
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}
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