1.题目问题

2.样例

3.代码实现

补充：注意空格

// 定义Vehicle接口
interface Vehicle {
    void start();
    void stop();
}

// 实现Vehicle接口的Bike类
class Bike implements Vehicle {
    @Override
    public void start() {
        System.out.println("i am bike,i am running");
    }

    @Override
    public void stop() {
        System.out.println("i am bike,i am stop");
    }
}

// 实现Vehicle接口的Bus类
class Bus implements Vehicle {
    @Override
    public void start() {
        System.out.println("i am bus,i am running");
    }

    @Override
    public void stop() {
        System.out.println("i am bus,i am stop");
    }
}