Question

我的代码存在两个问题第一：我似乎无法在正确的位置添加“$”（我不能让它看起来像$ 10.00只有10.00 $）
第二：添加一个Scanner类最终会使程序“运行”但没有发生任何事情。（如果我用粗数设置它可以运行正常，但不能使用扫描仪类）

import java.util.Scanner;
public class Payment
{
    public static void main(String[] args) 
    { 
        Scanner Keyboard = new Scanner(System.in);
        //double gross = Keyboard.nextDouble(); will not work
        //double gross = 8000; will work
        double fed = (0.15 * gross);
        double state = (0.035 * gross);
        double soc = (0.0575 * gross);
        double med = (0.0275 * gross);
        double pen = (0.05 * gross);
        double hea = 75;
        double net = (gross - (fed + state + soc + med + pen + hea));

        System.out.println("Paycheck calculation by employee\n");
        System.out.printf("Gross Amount:%28.2f%n", gross);
        System.out.printf("Federal Tax:%29.2f%n", fed);
        System.out.printf("State Tax:%31.2f%n", state);
        System.out.printf("Social Security Tax:%21.2f%n", soc);
        System.out.printf("Medicare/Medicaid Tax:%19.2f%n", med);
        System.out.printf("Pension Plan %28.2f%n", pen);
        System.out.printf("Health Insurance %24.2f%n%n", hea);
        System.out.printf("Net Pay:%33.2f", net);
    }
}

Answer 1

您可能想打印输入提示。关于货币格式，您可以使用DecimalFormat类。

import java.text.DecimalFormat;
import java.util.Scanner;
public class Payment
{
    public static void main(String[] args)
    {
        Scanner keyboard = new Scanner(System.in);
        System.out.print("Enter gross amount: ");
        double gross = keyboard.nextDouble();
        //double gross = 800; //will work
        double fed = (0.15 * gross);
        double state = (0.035 * gross);
        double soc = (0.0575 * gross);
        double med = (0.0275 * gross);
        double pen = (0.05 * gross);
        double hea = 75;
        double net = (gross - (fed + state + soc + med + pen + hea));
        DecimalFormat currency = new DecimalFormat("$0.00");
        System.out.println("Paycheck calculation by employee\n");
        System.out.printf("Gross Amount: %27s%n", currency.format(gross));
        System.out.printf("Federal Tax:%29s%n", currency.format(fed));
        System.out.printf("State Tax:%31s%n", currency.format(state));
        System.out.printf("Social Security Tax:%21s%n", currency.format(soc));
        System.out.printf("Medicare/Medicaid Tax:%19s%n", currency.format(med));
        System.out.printf("Pension Plan %28s%n", currency.format(pen));
        System.out.printf("Health Insurance %24s%n%n", currency.format(hea));
        System.out.printf("Net Pay:%33s", currency.format(net));
        keyboard.close();
    }
}

Answer 2

回答你的第一个问题，你可以这样：

System.out.printf("Gross Amount %28c%.2f%n", '$',  gross);

你的第二个问题，我认为你的问题是Locale。在这种情况下，Locale的输入格式可能会有所不同，具体取决于您的Double。你可以这样做：

keyboard.useLocale(Locale.US);

这样，Double的输入将是小数部分中由.分隔的整数部分。 8000和5.5是Double输入的有效示例。

添加“$”到右对齐的数字和Scanner类没有运行，java

2 个答案: