構建類層次結構的最佳方法是什麼？

Question

我在嘗試基於類層次結構的挑戰。我必須嘗試評估並正確構建包括基於交通工具的車輛的層次結構。下面是類選項：

• 自行車
• 車
• 週期
• JetPlane
• RoadVehicle
• 充燃料
• 列車
• 交通運輸
• 三輪車

就結構而言，我必須決定哪些類是抽象類，哪些類擴展哪些類和哪些類是接口。

以下是我想出迄今：

交通運輸

public abstract class Transport 
{ 

    //Super class. All vehicles are a form of transportation. 

} 

自行車

public abstract class Bicycle extends RoadVehicle 
{ 

    //Bicycle is a road vehicle. Does not implement Refuelable as it does not use fuel. Is abstract because Cycle is its sub-class. 

} 

汽車

public class Car extends RoadVehicle implements Refuelable 
{ 

    //Extends RoadVehicle which extends Transport and also implements Refuelable as it uses fuel. 

} 

週期

public class Cycle extends Bicycle 
{ 

    //Cycle is an act which is carried out when using a Bicycle so it extends Bicycle. 

} 

JetPlane

public class JetPlane extends Transport implements Refuelable 
    { 

     //JetPlane is not a road vehicle but directly extends Transport because it is used as a form of transport, also implements Refuelable. 

    } 

RoadVehicle

public abstract class RoadVehicle extends Transport 
{ 

    //All classs that are road vehicles extends this clss. This seperates the road vehicles from the non-road vehicles. 

} 

充燃料

public interface Refuelable 
{ 

    //An interface that declares which tyypes of transport use fuel and which do not. 

} 

列車

public class Train extends Transport implements Refuelable 
{ 

    //Trains are not a road veicle but do extend Transport and are refuelable. 

} 

三輪車

public class Tricycle extends Transport 
{ 

//Tricycle is a form of transport for children, it is not refuelable and does not operate on the road. 

} 

這是正確的，或者你可以看到任何錯誤？我這樣做是爲了測試我對繼承的知識，所以任何建議或指針都會非常感激，謝謝。

Answer 1

既然我們不能告訴大家，應該是在每個實體的方法，我會用下面的啓動：

interface Transport 
interface Refuelable 
interface RoadVehicle extends Transport 
interface Cycle extends RoadVehicle 

class Bicycle implements Cycle 
class Tricycle implements Cycle 
class Car implements RoadVehicle, Refuelable 
class JetPlane implements Transport, Refuelable 
class Train implements Transport