的Java覆盖类成员与不同类型的

Question

我有以下枚举：

public enum CarManufacturer { 
    VOLKSWAGEN, CHEVROLET, DODGE, ... 
} 
public enum PlaneManufacturer { 
    LOCKHEED, AIRBUS, BOEING, ... 
} 

及以下超：

public class Vehicle { 
    int size; 
    int weight; 
    ... 
} 

我想要做的是有车所以大家里面明确制造商说收到一个车辆类知道它有一个制造商。

例：

public class Vehicle { 
    int size; 
    int weight; 
    int manufacturer; 

    abstract int getManufacturer() {}; 
} 

public class Plane extends Vehicle { 
    PlaneManufacturer manufacturer; 
    PlaneManufacturer getManufacturer() { return this.manufacturer; } 
    ... 
} 
public class Car extends Vehicle { 
    CarManufacturer manufacturer; 
    CarManufacturer getManufacturer() { return this.manufacturer; } 
    ... 
} 

什么是做到这一点的最好方法是什么？

Answer 1

创建一个Manufacturer接口，并让你的枚举实现该接口。

public interface Manufacturer {} 

public enum CarManufacturer implements Manufacturer { 
    VOLKSWAGEN, CHEVROLET, DODGE, ... 
} 
public enum PlaneManufacturer implements Manufacturer { 
    LOCKHEED, AIRBUS, BOEING, ... 
} 

然后在您的Vehicle类，您可以：

public class Vehicle { 
    int size; 
    int weight; 
    Manufacturer manufacturer; 

    Manufacturer getManufacturer() { 
     return manufacturer; 
    }; 
} 

Answer 2

每种枚举从枚举抽象超含蓄地延伸。所以，你可以在车辆超引用属性的枚举，如：

public class Vehicle { 
     int size; 
     int weight; 
     Enum manufacturer; 

     abstract Enum getManufacturer() {}; 
    }