1.題目問題

2.輸入

3.輸出

4.代碼實現

補充：

沒錯，你沒看錯，沒有?abstract class Vehicle ，才能過。

惡心人

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");}
}

完整代碼：

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();}
}