抽象类和接口的区别

abstract class Animal {
    protected String name;

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

    public abstract void makeSound();

    public void sleep() {
        System.out.println(name + " is sleeping");
    }
}

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

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

interface Flyable {
    void fly();
}

class Bird implements Flyable {
    private String name;

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

    @Override
    public void fly() {
        System.out.println(name + " is flying");
    }
}