1.题目问题

2.输入

3.输出

4.代码实现

补充：

没错，你没看错，没有 abstract class Vehicle ，才能过。

恶心人

答案：

{abstract void NoOfWheels();
}class Car extends Vehicle {@Overridepublic void NoOfWheels() {System.out.println("four wheels");}
}class Motorbike extends Vehicle {@Overridepublic void NoOfWheels() {System.out.println("two wheels");}
}

完整代码：

abstract class Vehicle {abstract void NoOfWheels();
}class Car extends Vehicle {@Overridepublic void NoOfWheels() {System.out.println("four wheels");}
}class Motorbike extends Vehicle {@Overridepublic void NoOfWheels() {System.out.println("two wheels");}
}class Main{public static void main(String[] args){Car c=new Car();c.NoOfWheels();Motorbike m=new Motorbike();m.NoOfWheels();}
}