接口包括抽象方法，求解答

public interface Swimmable {
    void swim();

    static void saftPrompt(){
        System.out.println("有用畅快，注意安全！");
    }
}

public interface Flyable {
    void fly();
}

public class Duck implements Swimmable, Flyable{
    @Override
    public void fly() {
        System.out.println("实现接口Flyable的fly方法");
    }

    @Override
    public void swim() {
        System.out.println("实现接口Swimmable的swim方法");
    }

    public static void main(String[] args) {
        Swimmable s = new Duck();
        s.swim();
        Swimmable.saftPrompt();
        Flyable f = new Duck();
        f.fly();

    }
}

仅供参考，觉得有用的话，请采纳一下哈！！！