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// Dog类:继承Animal,实现Swimmable接口
public class Dog extends Animal implements Swimmable {
// 重写父类抽象方法:发出叫声
@Override
public void makeSound() {
System.out.println("汪汪汪!");
}
// 实现接口的swim方法
@Override
public void swim() {
System.out.println("小狗在水里游泳~");
}
}