Question

首先 - 我在这个领域完全是新手，很抱歉，如果这段代码看起来很混乱。

我正在尝试制作“程序”，这将显示我未来的订阅计数。所以节目问我三个问题 -

您的实际订阅号码是什么。
每天有多少潜水员 - 率。
多少天

之后它会给我回答 -

“在22天内，你将拥有2000个潜艇”

当我键入没有十进制数的速率（例如1,2，...）时它工作正常。但是当我输入十进制数的速率时，它会抛出这样的错误 -

Exception in thread "main" java.util.InputMismatchException
at java.util.Scanner.throwFor(Unknown Source)
at java.util.Scanner.next(Unknown Source)
at java.util.Scanner.nextDouble(Unknown Source)
at test.maintest.main(maintest.java:16)

代码：

main.class

   package test;

import java.util.Scanner;
import java.util.Locale;

public class maintest {

    public static void main(String args[]) {
        Scanner input = new Scanner(System.in).useLocale(Locale.US);
        second classNd = new second();

        System.out.println("Your actual sub count is? ");
        Double count = input.nextDouble();
        System.out.println("How many days? ");
        Double day = input.nextDouble();
        System.out.println("Your actual rate ");
        Double rate = input.nextDouble();

        String answerCount = Double.toString(count);
        String answerDay = Double.toString(day);
        String answerRate = Double.toString(rate);

        classNd.getSubs(answerCount);
        classNd.getDay(answerDay);
        classNd.getRate(answerRate);
        classNd.answerMe();


        }

        }

second.class：

package test;
public class second {

    private String gotSubs;
    public void getSubs(String answ) {
        gotSubs=answ;
    }   
    private String gotRate;
    public void getRate(String gtRate) {
        gotRate=gtRate;
    }
    private String gotDay;
    public void getDay(String gotDays){
        gotDay=gotDays;
    }
    public void answerMe() {

        double getRates = Double.parseDouble(gotRate);
        double amount;
        double numberSubs = Double.parseDouble(gotSubs);
        double numberOf = Double.parseDouble(gotDay);

        do{

            amount = numberSubs*Math.pow(1+getRates, numberOf);
            System.out.println("In " + numberOf + " days, u will have " + amount + " subs");
        }while(numberOf<0);
                }
        }

所以我不得不将Locale事物添加到主类：

 import java.util.Scanner;
 import java.util.Locale;

    public class maintest {

        public static void main(String args[]) {
            Scanner input = new Scanner(System.in).useLocale(Locale.US);
            second classNd = new second();

十进制数字保存了我的扫描仪

0 个答案: