創建與Java子子

我是針對創建一個類車輛用三個子類[賽車，汽車和卡車]，然後把一個子類爲汽車，像顯示在UML。

但是當我嘗試說

public class HybridCar extends Car

要做到這一點，我得到一個錯誤。我知道在java中我不能繼承雙重繼承，所以如何格式化HybridCar構造函數？

這裏是我的Car類。

public class Car extends Vehicle{ 
    double luggageCap; 
    double passengerCap; 

    public Car(String make, String model, double engSz, String id, String year, String color, double lugCap, double passCap){ 
     super(make, model, engSz, id, year, color); 
     luggageCap = lugCap; 
     passengerCap = passCap; 
    } 

    public double getLuggageCap(){ 
     return luggageCap; 
    } 

    public double getPassengerCap(){ 
     return passengerCap; 
    } 

    public String toString(){ 
     return super.toString()+", "+luggageCap+", "+passengerCap; 
    } 
}

這裏是我的HybridCar類：

public class HybridCar extends Car{ 
    double luggageCap; 
    double passengerCap; 
    double batteryCap; 

    public HybridCar(String make, String model, double engSz, String id, String year, String color, double lugCap, double passCap, double batCap){ 
     super(make, model, engSz, id, year, color); 
     luggageCap = lugCap; 
     passengerCap = passCap; 
     batteryCap = batCap; 
    }  

    public String toString(){ 
     return super.toString()+", "+luggageCap+", "+passengerCap+", "+batteryCap; 
    } 

}

這裏是錯誤日誌：

HybridCar.java:9: error: constructor Car in class Car cannot be applied to given types; super(make, model, engSz, id, year, color);^ required: String,String,double,String,String,String,double,double found: String,String,double,String,String,String reason: actual and formal argument lists differ in length 1 error –

來源

2017-03-31 j dogg

1）錯誤是什麼意思？ 2）你可以顯示你的HybridCar類的代碼嗎？ 3）「我知道在java中我不能雙重繼承」，如果HybridCar只繼承Car那麼這不是問題，那麼雙重繼承是從哪裏來的？ –

你會得到什麼樣的錯誤？也許你只是忘了放大括號？ – vhula

公共類HybridCar延伸汽車雙行李箱蓋; double passengerCap; 雙層電池蓋; public HybridCar（String make，String model，double engSz，String id，String year，String color，double lugCap，double passCap，double batCap）{超級品牌，型號，engSz，id，year，color）; luggageCap = lugCap; passengerCap = passCap; batteryCap = batCap; } public String toString（）{ return super.toString（）+「，」+ luggageCap +「，」+ passengerCap +「，」+ batteryCap; } } –

error: constructor Car in class Car cannot be applied to given types; super(make, model, engSz, id, year, color);^required: String,String,double,String,String,String,double,double found: String,String,double,String,String,String reason: actual and formal argument lists differ in length 1 error

，如果你在Car構造仔細看也有一定的8個參數類型：

Car(String make, String model, double engSz, String id, String year, String color, double lugCap, double passCap)

但是，你只有通過在6個參數：

super(make, model, engSz, id, year, color);

這個問題似乎是，你沒有在所需的參數傳遞給Car構造。

您HybribCar構造改成這樣：

super(make, model, engSz, id, year, color,lugCap, passCap);

側面說明 - 確保您傳遞的參數權數每類的構造函數，並確保類型爲每個參數的匹配。

來源

2017-03-31 20:36:02

創建與Java子子

回答

相關問題