迴歸方法，計算錯誤

Question

我寫了下面的程序：

public double calcElectricityCO2(double avgBill,           double avgPrice) 
    { 
     return (avgBill/avgPrice)*1.37*12; 

    } 
    public static void main(String[ ] args) 
    { 
     double avgBill = 338.59; 
     double avgPrice = 0.12; 
     double emmision = calcElectricityCO2(avgBill,avgPrice); 
     System.out.printf("Annual CO2 Emission from Electricity Usage: %1.2f %n",emmision); 
    }  
} 

當運行在double emmision = calcElectricityCO2(avgBill,avgPrice);報告錯誤，我做了什麼錯在那裏？

Answer 1

您的calcElectricityCO2應宣佈爲static。

public *static* double calcElectricityCO2(double avgBill, double avgPrice){ 
    //implementation 
}