如何从命令行获取双输入和JOptionPane的双输入并将它们相乘以打印结果？

问题描述

我有JoptionPane和Command行上的数字请求，但我不知道如何存储它们将它们相乘，请你看一下并建议我可以使用的任何选项让它工作，这里是我目前的代码：

I have the request for the numbers on the JoptionPane and the Command line but I dont know how to store them to multiply them together, can you please have a look and suggest any options I can use to get it working, here is my current code :

import java.util.Scanner;
import javax.swing.JOptionPane;
/**
 *
 * @author Adam
 */
public class Inputting {


    public static void main(String[] args) {
        Scanner Scan = new Scanner (System.in); // Creates the Scanner to allow input



        System.out.print("Enter a Number");
        String input = null;
        String first = Scan.next();



        String Second; // Second Declared as a string
        Second = JOptionPane.showInputDialog("Enter Another Number");
        double d = Double.parseDouble(Second);

        System.out.print("What is your Name?");
        String name = Scan.next();

        String Age; // Age Declared as a String
        Age = JOptionPane.showInputDialog("Enter your age ");

        System.out.print( name + " "+ "(Aged" + " " + Age +  ")" + "," + "your answer is " + first*Second );








    }

}

推荐答案

...
String first = Scan.next();
...
Second = JOptionPane.showInputDialog("Enter Another Number");

此后你只将

After this you convert only

second

转换为数值，但不要使用它！

into a numeric value, but don't use it!

double d = Double.parseDouble(Second);

解决方案是转换

Solution is to convert

first

和

Second

成这样的数值：

into numeric values like this:

double firstValue = Double.parseDouble(first);
double secondValue = Double.parseDouble(Second);

// get the result
double result = firstValue * secondValue;

现在你可以打印它：

Now you can print it:

System.out.print( name + " "+ "(Aged" + " " + Age +  ")" + "," + "your answer is " + result );

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