当我尝试进行计算时，Java 无法识别 double

Question

因此，对于这个程序，我必须使用 java GUI 来获取温度和风速，然后从那里计算 Windchill。我这样做是为了当用户单击“计算 Windchill”按钮时，它应该使用我输入的公式来计算。但我不断收到有关此 double 的各种错误，我不知道为什么。您可以在 actionPerformed 部分找到错误，是“windChillInt”出现此错误。谢谢。

import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
import java.util.*;
public class Windchill extends JFrame implements ActionListener{
    private static final int FRAME_WIDTH = 300;
    private static final int FRAME_HEIGHT = 200;
    private static final int FRAME_X_ORIGIN = 150;
    private static final int FRAME_Y_ORIGIN = 250;
    private String degree;
    private String wind;
    private int degreeInt;
    private int windInt;
    private double windChillInt;
    private JButton windButton;
    private JLabel prompt;
    private JLabel prompt1;
    private JTextField inputLine;
    private JTextField inputLine1;

    public Windchill(){
        setTitle("Windchill");
        setSize(FRAME_WIDTH, FRAME_HEIGHT);
        setLocation(FRAME_X_ORIGIN, FRAME_Y_ORIGIN);
        setDefaultCloseOperation(EXIT_ON_CLOSE);
        Container contentPane = getContentPane();
        contentPane.setLayout(new FlowLayout());    
        inputLine = new JTextField();
        inputLine.setColumns(3);
        inputLine.addActionListener(this);
        contentPane.add(inputLine);
        prompt = new JLabel();
        prompt.setText("Enter the degrees in Farienheight       ");
        prompt.setSize(150,25);
        contentPane.add(prompt);
        inputLine1 = new JTextField();
        inputLine1.setColumns(3);
        inputLine1.addActionListener(this);
        contentPane.add(inputLine1);

        prompt1 = new JLabel();
        prompt1.setText("Enter the wind speed in MPH");
        prompt1.setSize(150,25);
        contentPane.add(prompt1);

        windButton = new JButton("Calculate windchill");
        contentPane.add(windButton);
        windButton.addActionListener(this);
    }
    public void actionPerformed(ActionEvent event){
        if (event.getSource() instanceof JButton){
            JButton clickedButton = (JButton) event.getSource();
            if (clickedButton == windButton){
                degree = inputLine.getText();
                degreeInt = Integer.parseInt(degree);
                wind = inputLine1.getText();
                windInt = Integer.parseInt(wind);
                windChillInt = 0.08(degreeInt - 91.4)        (3.71*math.sqrt(windInt) + 5.81 - 0.25 *windInt) + 91.4;

            }

        }
    }
    public static void main(String[] args) {
        Windchill frame;
        frame = new Windchill();
        frame.setVisible(true);
    }
}

好的，谢谢大家，我已经成功了，但现在我遇到了另一个问题，它不会像我想要的那样在 GUI 上显示新的 WindChillInt。这是我把它改成的。

public void actionPerformed(ActionEvent event){
        if (event.getSource() instanceof JButton){
            JButton clickedButton = (JButton) event.getSource();
            if (clickedButton == windButton){
                degree = inputLine.getText();
                degreeInt = Integer.parseInt(degree);
                wind = inputLine1.getText();
                windInt = Integer.parseInt(wind);
                windChillInt = 0.08 * (degreeInt - 91.4)*(3.71* (Math.sqrt(windInt)) + 5.81 - 0.25 *windInt) + 91.4;

                prompt2 = new JLabel();
                prompt2.setText("The windchill is " + windChillInt);
                prompt2.setSize(150,25);
                Container contentPane = getContentPane();
                contentPane.setLayout(new FlowLayout());
                contentPane.add(prompt2);
            }

Answer 1

我相信问题出在这一行:

windChillInt = 0.08(degreeInt - 91.4)        (3.71 * math.sqrt(windInt) + 5.81 - 0.25 *windInt) + 91.4;

<小时/>

windChillInt = 0.08(degreeInt - 91.4)应该是windChillInt = 0.08 * (degreeInt - 91.4) 。

然后，您需要乘以 windChillInt = 0.08 * (degreeInt - 91.4)和(3.71 * math.sqrt(windInt) + 5.81 - 0.25 *windInt) + 91.4一起，或者搬家(3.71 * math.sqrt(windInt) + 5.81 - 0.25 *windInt) + 91.4分解为它自己的语句并将其分配给某些东西。