Question

所以我要做的是使用我的ScannerTester类来使用Scanner来读取我的半径，名字和姓氏，然后使用我的JOptionPaneTester类来使用JOptionPane来读取radius，first和last name。我的老师曾经在课堂上讲过这个，但是，我在使JOptionPane正常工作时遇到了一些麻烦。在尝试输入区域的双值时，我不断收到错误。我得到的错误是java.lang.String无法转换为java.lang.Double。但是，当我只输入字符串时它确实有效，但它让我打开了两个不同的String [] args文件。对不起，我还是Java的新手，而且这门课程很快，所以很难跟上这个以及我所有的其他课程。以下是这两个类的代码：

import java.io.*;
import java.util.*;

public class ScannerTester extends JOptionPaneTester
{
    public static void main(String [] args)
    {
        Scanner ScannerTester = new Scanner(System.in);
        double area, answer, radius;
        String first, last;

        System.out.print("What is the area? ");

        area = ScannerTester.nextDouble();
        radius = (area) / (Math.PI);
        answer = Math.sqrt(radius);

        System.out.println("Radius of your circle is " + answer);

        System.out.println("What is your first name? ");
        first = ScannerTester.next();

        System.out.println("What is your last name? ");

        last = ScannerTester.next();

        System.out.println("Your full name is " + first + " " + last);
    }
}

import javax.swing.JOptionPane;

public class JOptionPaneTester
{
    public static void main (String [] args)
    {
        Double area, answer, radius;
        String first, last, area1;

        area = JOptionPane.showInputDialog("What is the area? ");
        first = JOptionPane.showInputDialog("What is your first name? ");
        last = JOptionPane.showInputDialog("What is your last name? ");

        double area = Double.parseDouble(area1);

        JOptionPane.showMessaheDialog( null, "What is the area? " );
        JOptionPane.showMessageDialog( null, "What is your first name? ");
        JOptionPane.showMessageDialog( null, "What is your last name? ");

        System.exit (0);
    }
}

如何使我的JOptionPane工作？

0 个答案: