Java抽象类与接口混合继承详解

abstract class Animal {
    protected String name;

    public Animal(String name) {
        this.name = name;
    }

    // 具体方法
    public void sleep() {
        System.out.println(name + " 正在睡觉");
    }

    // 抽象方法，由子类实现
    public abstract void makeSound();
}

interface Flyable {
    void fly();
}

interface Swimmable {
    void swim();
}

class Duck extends Animal implements Flyable, Swimmable {
    public Duck(String name) {
        super(name);
    }

    @Override
    public void makeSound() {
        System.out.println(name + " 呱呱叫");
    }

    @Override
    public void fly() {
        System.out.println(name + " 正在飞行");
    }

    @Override
    public void swim() {
        System.out.println(name + " 正在游泳");
    }
}

class Dog extends Animal {
    public Dog(String name) {
        super(name);
    }

    @Override
    public void makeSound() {
        System.out.println(name + " 汪汪叫");
    }
}

public class Main {
    public static void main(String[] args) {
        Duck duck = new Duck("唐老鸭");
        duck.makeSound(); // 呱呱叫
        duck.fly();       // 实现Flyable
        duck.swim();      // 实现Swimmable
        duck.sleep();     // 继承自Animal

        Dog dog = new Dog("旺财");
        dog.makeSound();  // 汪汪叫
        dog.sleep();      // 继承自Animal
    }
}