将接口与或运算符一起使用

// 定义两个接口
interface Flyable {
    void fly();
}

interface Swimmable {
    void swim();
}

// 实现接口的类
class Duck implements Flyable, Swimmable {
    public void fly() {
        System.out.println("Duck is flying.");
    }

    public void swim() {
        System.out.println("Duck is swimming.");
    }
}

class Fish implements Swimmable {
    public void swim() {
        System.out.println("Fish is swimming.");
    }
}

public class Main {
    public static void main(String[] args) {
        Duck duck = new Duck();
        Fish fish = new Fish();

        // 使用或运算符来判断对象是否具备某种能力
        if (duck instanceof Flyable || duck instanceof Swimmable) {
            System.out.println("Duck can fly or swim.");
        }

        if (fish instanceof Flyable || fish instanceof Swimmable) {
            System.out.println("Fish can swim.");
        }
    }
}