Java-为什么我的变量在Java中显示为0？

安德鲁布：

我是一个新的程序员，正在为课堂做作业。我正在尝试计算在不同网站上出售鞋子的利润。但是，当我尝试获取变量Fee时，输出将返回为0。请帮助谢谢！

我试图使Fee = 5；但是，输出仍然是0.0

import java.util.Scanner;

public class Shoe
{
    private double Cost;
    private double SoldPrice;
    private double ShippingCost;
    private double Fee;
    public Shoe()
    {
        Scanner input = new Scanner(System.in);
        System.out.println( " Enter Cost Of Shoe. " );
        Cost = input.nextDouble();
        System.out.println ( " Enter Sold Price Before Fees. ");
        SoldPrice = input.nextDouble();
        System.out.println ( " Enter shipping cost. " );
        ShippingCost = input.nextDouble();
        System.out.println ( " How did you sell the Shoe? [ Stockx , Ebay , Goat , Local , Grailed , Paypal  ] ? ");
//user MUST enter the provided sites perfectly.
        {
            String choice = input.next();
            if(choice.equals(" Stockx "))
            {
                Fee = 0.09;
//determinds what the value of Fee should be set to, depending on where the shoe was sold.
            }
            else if (choice.equals(" Ebay "))
            {
                Fee = (( 0.029) + 0.3 );
            }
            else if(choice.equals(" Goat "))
            {
                Fee = (( 0.095 ) + 5 );
            }
            else if(choice.equals(" Local "))
            {
                Fee = 0;
            }
            else if(choice.equals(" Grailed "))
            {
                Fee = (( 0.065 ) + 0.3 );
            }
            else if(choice.equals(" Paypal "))
            {
                Fee =(( 0.029) + 0.3 );
            }
            else if (choice.equals(" Test "))
            {
                Fee = 5;
//attempted to test if it was just rounding down for variables, however, the output was 0 when Fee was 5.
            }
            System.out.println( +Fee );
        }
    }
}

本杰明·D：

Federico klez Culloca是正确的。

删除要测试的值周围的空格，它将起作用。

为了安全起见，您甚至可以在trim()输入中使用该方法，因此即使您键入" Ebay "，它也可以使用。

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