如果语句运算符被忽略？ [英] If statement operator being ignored?

问题描述

在以下方法中，当输入窗口出现时，它不会正确添加SolarPanel。

当我输入Electric后跟Yes / yes时，我得到以下
基本价格：20000
电动型号：2000
总计：22000

但当我做电+是/是时我得到

基本价格：20000
电动型号：2000
太阳能电池板：5000
总计：27000

怎么来的？

  public static int CalculateCost（）
 {
 String typeOfCarCost = askCarType（）; 
 String SolarPanelCost = askSolarPanel（）; 
 int basicPrice = 20000; 
 int ElectricModel = 2000; 
 int SolarPanel = 5000; 
 int total = 0; 
 
 if（typeOfCarCost.equals（Electric）||（typeOfCarCost.equals（electric）&&（SolarPanelCost.equals（No）||（SolarPanelCost.equals（没有）））））
 {
 total = basicPrice + ElectricModel; 
 System.out.println（基本价格：+ basicPrice）; 
 System.out.println（Electric Model：+ ElectricModel）; 
 System.out.println（总计：+总计）; 
 
} 
 else if（typeOfCarCost.equals（Electric）||（typeOfCarCost.equals（electric）&&（SolarPanelCost.equals（Yes）|| （SolarPanelCost.equals（是）））））
 {
 total = basicPrice + ElectricModel + SolarPanel; 
 System.out.println（基本价格：+ basicPrice）; 
 System.out.println（Electric Model：+ ElectricModel）; 
 System.out.println（太阳能电池板：+ SolarPanel）; 
 System.out.println（总计：+总计）; 
} 
其他
 {
总计+ = basicPrice; 
 System.out.println（基本价格：+ basicPrice）; 
 System.out.println（总计：+总计）; 
} 
总回报; 
} //结束CalculateCost 
  

例如，它询问：
电或混合动力（我选择电动，这应该增加2000总成本）
电动

太阳能电池板（是或否，我选择是。这应该增加5000总成本）
是

控制台窗口会显示此信息，但它不会为太阳能电池板添加。
基本价格：20000
电动型号：2000
总计：22000

此外，我如何计算折扣-500选择电动模型和太阳能电池板时的总数。

整个代码发布在下面。
有什么建议吗？

  import javax.swing。*; 
公共类short7 {
 
 / ** 
 * @param args 
 * / 
 public static void main（String [] args）{
 // TODO自动生成的方法stub 
 
 PrintOptions（）; 
 
} //结束主
 
 public static String askCarType（）
 {
 String typeOfCar; 
 typeOfCar = JOptionPane.showInputDialog（Electric还是Hybrid？）; 
 if（！typeOfCar.equals（Electric）&&（！typeOfCar.equals（electric）&&（！typeOfCar.equals（Hybrid）&&（！typeOfCar .equals（hybrid）））））
 {
 JOptionPane.showMessageDialog（null，你必须选择电动或混合型汽车。）; 
 typeOfCar = JOptionPane.showInputDialog（Electric还是Hybrid？）; 
} 
返回typeOfCar; 
} //结束askCarType 
 
 public static String askSolarPanel（）
 {
 String wantSolarPanel; 
 wantSolarPanel = JOptionPane.showInputDialog（你想要太阳能电池板吗？）; 
 if（！wantSolarPanel.equals（Yes）&&（！wantSolarPanel.equals（yes）&&（！wantSolarPanel.equals（No）&&（！wantSolarPanel .equals（no）））））
 {
 JOptionPane.showMessageDialog（null，你必须输入是或否）; 
 wantSolarPanel = JOptionPane.showInputDialog（你想要太阳能电池板吗？）; 
} 
返回wantSolarPanel; 
} //结束askSolarPanel 
 
 public static int calculateDiscount（）
 {
 String typeOfCarSelected = askCarType（）; 
 String SolarPanelSelected = askSolarPanel（）; 
 int Discount = 0; 
 if（typeOfCarSelected.equals（Electric）&&（typeOfCarSelected.equals（electric）&&（typeOfCarSelected.equals（Hybrid）&&（typeOfCarSelected.equals（ hybrid）& SolarPanelSelected.equals（Yes）|| SolarPanelSelected.equals（yes）））））
 {
 Discount = 500; 
} 
其他
 {
折扣= 0; 
} 
退货折扣; 
} //结束calculateDiscount 
 
 public static int CalculateCost（）
 {
 String typeOfCarCost = askCarType（）; 
 String SolarPanelCost = askSolarPanel（）; 
 int basicPrice = 20000; 
 int ElectricModel = 2000; 
 int SolarPanel = 5000; 
 int total = 0; 
 
 if（typeOfCarCost.equals（Electric）||（typeOfCarCost.equals（electric）&（SolarPanelCost.equals（No）||（SolarPanelCost.equals（no） ）））））
 {
 total = basicPrice + ElectricModel; 
 System.out.println（基本价格：+ basicPrice）; 
 System.out.println（Electric Model：+ ElectricModel）; 
 System.out.println（总计：+总计）; 
 
} 
 else if（typeOfCarCost.equals（Electric）||（typeOfCarCost.equals（electric）&（SolarPanelCost.equals（Yes）||（SolarPanelCost） .equals（是）））））
 {
 total = basicPrice + ElectricModel + SolarPanel; 
 System.out.println（基本价格：+ basicPrice）; 
 System.out.println（Electric Model：+ ElectricModel）; 
 System.out.println（太阳能电池板：+ SolarPanel）; 
 System.out.println（总计：+总计）; 
} 
其他
 {
总计+ = basicPrice; 
 System.out.println（基本价格：+ basicPrice）; 
 System.out.println（总计：+总计）; 
} 
总回报; 
} //结束CalculateCost 
 
 
 public static void PrintOptions（）
 {
 int printTotal = CalculateCost（）; 
} //结束PrintOptions 
 
 
 
} //结束类short7 
  

解决方案

您需要使用双括号和'&&'，如下所示： -

< pre class =lang-java prettyprint-override> if（（typeOfCarCost.equals（Electric）|| typeOfCarCost.equals（electric））&&（（SolarPanelCost.equals（ 否）|| SolarPanelCost.equals（no）））
{
total = basicPrice + ElectricModel;
System.out.println（Basic Price：+ basicPrice）;
System.out.println（Electric Model：+ ElectricModel）;
System.out.println（Total：+ total）;

}
else if（（typeOfCarCost.equals（Electric）|| typeOfCarCost.equals（electric））&&（SolarPanel Cost.equals（是）|| SolarPanelCost.equals（是）））
{
total = basicPrice + ElectricModel + SolarPanel;
System.out.println（基本价格：+ basicPrice）;
System.out.println（Electric Model：+ ElectricModel）;
System.out.println（太阳能电池板：+ SolarPanel）;
System.out.println（总计：+总计）;
}


In the following method, it doesn't do the addition for the SolarPanel correctly when the input window appears.

When I type in "Electric" followed by "Yes/yes" i get the following Basic Price:20000 Electric Model:2000 Total:22000

but when I do "electric" + "yes/Yes" I get

Basic Price:20000 Electric Model:2000 Solar Panel:5000 Total:27000

how come?

public static int CalculateCost()
                    {
                        String typeOfCarCost = askCarType();
                        String SolarPanelCost = askSolarPanel();
                        int basicPrice = 20000;
                        int ElectricModel = 2000;
                        int SolarPanel = 5000;
                        int total = 0;

                        if (typeOfCarCost.equals("Electric") || (typeOfCarCost.equals("electric") && (SolarPanelCost.equals("No") || (SolarPanelCost.equals("no")))))
                                {
                                    total = basicPrice + ElectricModel;
                                    System.out.println("Basic Price:" + basicPrice);
                                    System.out.println("Electric Model:" + ElectricModel);
                                    System.out.println("Total:" + total);

                                }
                        else if (typeOfCarCost.equals("Electric") || (typeOfCarCost.equals("electric") && (SolarPanelCost.equals("Yes") || (SolarPanelCost.equals("yes")))))
                                {
                                    total = basicPrice + ElectricModel + SolarPanel;
                                    System.out.println("Basic Price:" + basicPrice);
                                    System.out.println("Electric Model:" + ElectricModel);
                                    System.out.println("Solar Panel:" + SolarPanel);
                                    System.out.println("Total:" + total);
                                }
                        else 
                        {
                            total += basicPrice;
                            System.out.println("Basic Price:" + basicPrice);
                            System.out.println("Total:" + total);
                        }
                        return total;
                    }//ends CalculateCost

For example, it asks: Electric or Hybrid ( I chose Electric, this should add 2000 to the total cost) Electric

Solar Panel (Yes or No, I chose yes. This should add 5000 to the total cost) Yes

The console window displays this however, it doesn't do the addition for the Solar Panel. Basic Price:20000 Electric Model:2000 Total:22000

Additionally, how can I factor in the discount of -500 on the total when both an Electric Model and Solar Panel are chosen.

The whole code is posted below. Any advice?

import javax.swing.*;
public class short7 {

/**
 * @param args
 */
public static void main(String[] args) {
    // TODO Auto-generated method stub

    PrintOptions();

}//ends main

    public static String askCarType()
    {
        String typeOfCar;
        typeOfCar = JOptionPane.showInputDialog("Electric or Hybrid?");
        if (!typeOfCar.equals("Electric") && (!typeOfCar.equals("electric") && (!typeOfCar.equals("Hybrid") && (!typeOfCar.equals("hybrid")))))
        {
            JOptionPane.showMessageDialog(null, "You have to choose either an Electric or Hybrid type of car.");
            typeOfCar = JOptionPane.showInputDialog("Electric or Hybrid?");
        }
        return typeOfCar;
    }//ends askCarType

        public static String askSolarPanel()
        {
            String wantSolarPanel;
            wantSolarPanel = JOptionPane.showInputDialog("Do you want a Solar Panel?");
            if (!wantSolarPanel.equals("Yes") && (!wantSolarPanel.equals("yes") && (!wantSolarPanel.equals("No") && (!wantSolarPanel.equals("no")))))
            {
                JOptionPane.showMessageDialog(null, "You have to enter either Yes or No");
                wantSolarPanel = JOptionPane.showInputDialog("Do you want a Solar Panel?");
            }
            return wantSolarPanel;
        }//ends askSolarPanel

            public static int calculateDiscount()
            {
                String typeOfCarSelected = askCarType();
                String SolarPanelSelected = askSolarPanel();
                int Discount = 0;
                if (typeOfCarSelected.equals("Electric") && (typeOfCarSelected.equals("electric") && (typeOfCarSelected.equals("Hybrid") && (typeOfCarSelected.equals("hybrid") & SolarPanelSelected.equals("Yes") || SolarPanelSelected.equals("yes")))))
                {
                     Discount = 500;
                }
                else
                {
                    Discount = 0;
                }
                return Discount;
            }//ends calculateDiscount

                    public static int CalculateCost()
                    {
                        String typeOfCarCost = askCarType();
                        String SolarPanelCost = askSolarPanel();
                        int basicPrice = 20000;
                        int ElectricModel = 2000;
                        int SolarPanel = 5000;
                        int total = 0;

                        if (typeOfCarCost.equals("Electric") || (typeOfCarCost.equals("electric") & (SolarPanelCost.equals("No") || (SolarPanelCost.equals("no")))))
                                {
                                    total = basicPrice + ElectricModel;
                                    System.out.println("Basic Price:" + basicPrice);
                                    System.out.println("Electric Model:" + ElectricModel);
                                    System.out.println("Total:" + total);

                                }
                        else if (typeOfCarCost.equals("Electric") || (typeOfCarCost.equals("electric") & (SolarPanelCost.equals("Yes") || (SolarPanelCost.equals("yes")))))
                                {
                                    total = basicPrice + ElectricModel + SolarPanel;
                                    System.out.println("Basic Price:" + basicPrice);
                                    System.out.println("Electric Model:" + ElectricModel);
                                    System.out.println("Solar Panel:" + SolarPanel);
                                    System.out.println("Total:" + total);
                                }
                        else 
                        {
                            total += basicPrice;
                            System.out.println("Basic Price:" + basicPrice);
                            System.out.println("Total:" + total);
                        }
                        return total;
                    }//ends CalculateCost


                            public static void PrintOptions()
                            {
                            int printTotal = CalculateCost();
                            }//ends PrintOptions



}//ends class short7

解决方案

You need to use double bracket and '&&' as below:-

if ((typeOfCarCost.equals("Electric") || typeOfCarCost.equals("electric")) && ((SolarPanelCost.equals("No") || SolarPanelCost.equals("no")))
                                    {
                                        total = basicPrice + ElectricModel;
                                        System.out.println("Basic Price:" + basicPrice);
                                        System.out.println("Electric Model:" + ElectricModel);
                                        System.out.println("Total:" + total);

                                    }
else if ((typeOfCarCost.equals("Electric") || typeOfCarCost.equals("electric")) && (SolarPanelCost.equals("Yes") || SolarPanelCost.equals("yes")))
                                    {
                                        total = basicPrice + ElectricModel + SolarPanel;
                                        System.out.println("Basic Price:" + basicPrice);
                                        System.out.println("Electric Model:" + ElectricModel);
                                        System.out.println("Solar Panel:" + SolarPanel);
                                        System.out.println("Total:" + total);
                                    }

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