我的天气数据java程序在eclipse中遇到了问题。

我试图让代码来计算风寒,但它不工作。我希望计算完成后,能在一个单独的窗口中显示。

另外我还需要程序在输入无效数据或风寒值无效时,出现一个单独的错误对话框,GUI中的文字应该反映出这个问题。而选择文件输入按钮时,应该显示一个文件选择窗口。文件打开错误将用异常和对话框处理。如果文件有效且打开成功,程序将读入数据,计算结果,并将数据和结果以列的形式显示在通过单独的类和Java文件创建的单独窗口中,并绘制温度和风寒值。

代码。

   import java.awt.BorderLayout;
   import java.awt.EventQueue;

   import javax.swing.JFrame;
   import javax.swing.JPanel;
   import javax.swing.border.EmptyBorder;
   import java.awt.Color;
   import javax.swing.border.LineBorder;
   import javax.swing.JLabel;
   import java.awt.FlowLayout;
   import java.awt.Font;
   import java.util.Scanner;

   import javax.swing.JTextField;
   import javax.swing.JButton;
   import java.awt.event.ActionListener;
   import java.awt.event.ActionEvent;

   public class WindChillCalculations extends JFrame {

   private JPanel contentPane;
   private static JTextField Fahrenheit_textField;
   private static JTextField Mph_textField;
   private static JTextField DewPoint_textField;

   /**
   * Launch the application.
   */
   public static void main(String[] args) {
   EventQueue.invokeLater(new Runnable() {
       public void run() {
           try {
               WindChillCalculations frame = new WindChillCalculations();
               frame.setVisible(true);
           } catch (Exception e) {
               e.printStackTrace();
           }
       }
    });

   String fahrenheit = Fahrenheit_textField.getText();
   String speed = Mph_textField.getText();
   String dewpoint = DewPoint_textField.getText();

   double t = Double.parseDouble(fahrenheit);
   double v = Double.parseDouble(speed);
   double d = Double.parseDouble(dewpoint);

   //Calculate windchill
   double w = 35.74 + (0.6215 * t) - (35.75 * (Math.pow(v,0.16))) + (0.4275 * (t * (Math.pow(v,0.16))));

   //Format to keep the windchill to 2 digits after decimal
   w = (int)(w*100)/100.0;
 }

 /**
 * Create the frame.
 */
 public WindChillCalculations() {
   setTitle("Weather Data Program - Wind Chill Calculations");
   setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
   setBounds(100, 100, 491, 383);
   contentPane = new JPanel();
   contentPane.setForeground(Color.WHITE);
   contentPane.setBackground(Color.BLACK);
   contentPane.setBorder(new EmptyBorder(5, 5, 5, 5));
   setContentPane(contentPane);
   contentPane.setLayout(null);

   JPanel panel = new JPanel();
   panel.setToolTipText("");
   panel.setBorder(new LineBorder(Color.WHITE));
   panel.setForeground(Color.BLACK);
   panel.setBackground(Color.BLACK);
   panel.setBounds(2, 4, 470, 338);
   contentPane.add(panel);
   panel.setLayout(null);

   JLabel WindChillCalculationsLabel = new JLabel("Wind Chill Calculations");
   WindChillCalculationsLabel.setBounds(146, 6, 137, 15);
   WindChillCalculationsLabel.setFont(new Font("Tahoma", Font.BOLD, 12));
   panel.add(WindChillCalculationsLabel);
   WindChillCalculationsLabel.setForeground(Color.WHITE);

   JLabel Fahrenheit_Label = new JLabel("Enter the temperature in degrees Fahrenheit:");
   Fahrenheit_Label.setForeground(new Color(255, 140, 0));
   Fahrenheit_Label.setBounds(10, 67, 305, 14);
   panel.add(Fahrenheit_Label);

   Fahrenheit_textField = new JTextField();
   Fahrenheit_textField.setBounds(338, 64, 86, 20);
   panel.add(Fahrenheit_textField);
   Fahrenheit_textField.setHorizontalAlignment(JTextField.RIGHT);
   Fahrenheit_textField.setColumns(10);

   JLabel Mph_Label = new JLabel("Enter the wind speed in mph:");
   Mph_Label.setForeground(new Color(255, 140, 0));
   Mph_Label.setBounds(10, 123, 305, 14);
   panel.add(Mph_Label);

   Mph_textField = new JTextField();
   Mph_textField.setColumns(10);
   Mph_textField.setBounds(338, 120, 86, 20);
   Mph_textField.setHorizontalAlignment(JTextField.RIGHT);
   panel.add(Mph_textField);

   JLabel DewPoint_Label = new JLabel("Enter the dew point in degrees Fahrenheit:");
   DewPoint_Label.setForeground(new Color(255, 140, 0));
   DewPoint_Label.setBounds(10, 177, 305, 14);
   panel.add(DewPoint_Label);

   DewPoint_textField = new JTextField();
   DewPoint_textField.setColumns(10);
   DewPoint_textField.setBounds(338, 174, 86, 20);
   DewPoint_textField.setHorizontalAlignment(JTextField.RIGHT);
   panel.add(DewPoint_textField);

   JButton FileEntry_btn = new JButton("File Entry");
   FileEntry_btn.setBackground(Color.BLACK);
   FileEntry_btn.setForeground(new Color(255, 140, 0));
   FileEntry_btn.setBounds(39, 283, 89, 23);
   panel.add(FileEntry_btn);

   JButton Compute_btn = new JButton("Compute");
   Compute_btn.setForeground(new Color(255, 140, 0));
   Compute_btn.setBackground(Color.BLACK);
   Compute_btn.setBounds(301, 283, 89, 23);
   panel.add(Compute_btn);

   Compute_btn.addActionListener(new ActionListener() {
       public void actionPerformed(ActionEvent e) {
           WeatherOutput output = new WeatherOutput();
           output.setVisible(true);
       }
   });

}}

解决方案:

我想这个答案不能满足上位者的要求。 我希望其他人能从中学习。

下面是我对代码的修改。

  1. 我使用了一个 JFrame. 我没有延长 JFrame. 只有当你想覆盖一个类的方法时,你才会扩展一个Swing组件,或者任何Java类。

  2. 我创建了GUI,并在计算风速之前给用户一个机会输入数值。

  3. 我取消了所有的绝对定位,使用了 周转式布局管理器. 我创建了一个主 JPanel 和两个下属 JPanel一个用于放置标签和文本字段,另一个用于放置按钮。 主面板使用了一个 BorderLayout在标签和文本字段面板上使用了一个 GridBagLayout和按钮面板使用的是 GridBagLayout 所以按钮会水平展开以填充区域。

  4. 我在代码中使用了camelCase变量名。

这是GUI的结果。

GUI

我对代码进行了格式化,以便更容易看到方法和类。

import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.Component;
import java.awt.Container;
import java.awt.EventQueue;
import java.awt.Font;
import java.awt.GridBagConstraints;
import java.awt.GridBagLayout;
import java.awt.Insets;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;

import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JTextField;
import javax.swing.border.EmptyBorder;
import javax.swing.border.LineBorder;

public class WindChillCalculations {

    private JPanel contentPane;
    private JTextField fahrenheit_textField;
    private JTextField mph_textField;
    private JTextField dewPoint_textField;

    /**
     * Launch the application.
     */
    public static void main(String[] args) {
        EventQueue.invokeLater(new Runnable() {
            public void run() {
                try {       
                    new WindChillCalculations();
                } catch (Exception e) {
                    e.printStackTrace();
                }
            }
        });
    }

    /**
     * Create the frame.
     */
    public WindChillCalculations() {
        // top, left, bottom, right
        Insets topInsets = new Insets(10, 10, 10, 10);
        Insets topRightInsets = new Insets(10, 0, 10, 10);
        Insets insets = new Insets(0, 10, 10, 10);
        Insets rightInsets = new Insets(0, 0, 10, 10);

        Color textColor = new Color(255, 140, 0);

        JFrame frame = new JFrame();
        frame.setTitle("Weather Data Program - "
                + "Wind Chill Calculations");
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

        contentPane = new JPanel();
        contentPane.setForeground(Color.WHITE);
        contentPane.setBackground(Color.BLACK);
        contentPane.setBorder(new EmptyBorder(5, 5, 5, 5));
        contentPane.setLayout(new BorderLayout());

        JLabel windChillCalculationsLabel = new JLabel(
                "Wind Chill Calculations");
        windChillCalculationsLabel.setFont(new Font(
                "Tahoma", Font.BOLD, 12));
        windChillCalculationsLabel.setForeground(Color.WHITE);
        windChillCalculationsLabel.setHorizontalAlignment(
                JLabel.CENTER);
        contentPane.add(windChillCalculationsLabel, 
            BorderLayout.BEFORE_FIRST_LINE);

        JPanel panel = new JPanel();
        panel.setToolTipText("");
        panel.setBorder(new LineBorder(Color.WHITE));
        panel.setForeground(Color.BLACK);
        panel.setBackground(Color.BLACK);
        panel.setLayout(new GridBagLayout());

        int gridy = 0;

        JLabel fahrenheit_Label = new JLabel("Enter the "
                + "temperature in degrees Fahrenheit:");
        fahrenheit_Label.setForeground(textColor);
        addComponent(panel, fahrenheit_Label, 0, gridy, 1, 1, 
                topInsets, GridBagConstraints.LINE_START,
                GridBagConstraints.HORIZONTAL);

        fahrenheit_textField = new JTextField(15);
        fahrenheit_textField.setHorizontalAlignment(
                JTextField.RIGHT);
        addComponent(panel, fahrenheit_textField, 1, gridy++, 1, 1, 
                topRightInsets, GridBagConstraints.LINE_START,
                GridBagConstraints.HORIZONTAL);

        JLabel mph_Label = new JLabel("Enter the wind "
                + "speed in mph:");
        mph_Label.setForeground(textColor);
        addComponent(panel, mph_Label, 0, gridy, 1, 1, 
                insets, GridBagConstraints.LINE_START,
                GridBagConstraints.HORIZONTAL);

        mph_textField = new JTextField(15);
        mph_textField.setHorizontalAlignment(JTextField.RIGHT);
        addComponent(panel, mph_textField, 1, gridy++, 1, 1, 
                rightInsets, GridBagConstraints.LINE_START,
                GridBagConstraints.HORIZONTAL);

        JLabel dewPoint_Label = new JLabel("Enter the "
                + "dew point in degrees Fahrenheit:");
        dewPoint_Label.setForeground(textColor);
        addComponent(panel, dewPoint_Label, 0, gridy, 1, 1, 
                insets, GridBagConstraints.LINE_START,
                GridBagConstraints.HORIZONTAL);

        dewPoint_textField = new JTextField(15);
        dewPoint_textField.setHorizontalAlignment(
                JTextField.RIGHT);
        addComponent(panel, dewPoint_textField, 1, gridy++, 1, 1, 
                rightInsets, GridBagConstraints.LINE_START,
                GridBagConstraints.HORIZONTAL);

        contentPane.add(panel, BorderLayout.CENTER);

        JPanel buttonPanel = new JPanel();
        buttonPanel.setBackground(Color.BLACK);
        buttonPanel.setForeground(Color.BLACK);
        buttonPanel.setLayout(new GridBagLayout());

        JButton fileEntry_btn = new JButton("File Entry");
        fileEntry_btn.setBackground(Color.BLACK);
        fileEntry_btn.setForeground(textColor);
        addComponent(buttonPanel, fileEntry_btn, 0, 0, 1, 1, 
                topInsets, GridBagConstraints.CENTER,
                GridBagConstraints.HORIZONTAL);

        JButton compute_btn = new JButton("Compute");
        compute_btn.setForeground(textColor);
        compute_btn.setBackground(Color.BLACK);
        compute_btn.setBounds(301, 283, 89, 23);
        addComponent(buttonPanel, compute_btn, 1, 0, 1, 1, 
                topRightInsets, GridBagConstraints.CENTER,
                GridBagConstraints.HORIZONTAL);

        compute_btn.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent e) {
                String fahrenheit = fahrenheit_textField.getText();
                String speed = mph_textField.getText();
                String dewpoint = dewPoint_textField.getText();

                try {
                    double f = Double.valueOf(fahrenheit);
                    double s = Double.valueOf(speed);
                    double d = Double.valueOf(dewpoint);
                    WindChill windChill = new WindChill(f, s, d);
                    double answer = windChill.calculateWindChill();

                    //TODO Create output display
                    System.out.println(answer);
                } catch (NumberFormatException e1) {
                    e1.printStackTrace();
                }
            }
        });

        contentPane.add(buttonPanel, BorderLayout.AFTER_LAST_LINE);

        frame.add(contentPane);
        frame.pack();
        frame.setLocationByPlatform(true);
        frame.setVisible(true);
    }

    private void addComponent(Container container, 
            Component component, int gridx, int gridy, 
            int gridwidth, int gridheight, Insets insets, 
            int anchor, int fill) {
        GridBagConstraints gbc = new GridBagConstraints(
                gridx, gridy, gridwidth, gridheight, 
                1.0, 1.0, anchor, fill, insets, 0, 0);
        container.add(component, gbc);
    }

    public class WindChill {

        private final double temperature;
        private final double windSpeed;
        private final double dewPoint;

        public WindChill(double temperature, double windSpeed, 
                double dewPoint) {
            this.temperature = temperature;
            this.windSpeed = windSpeed;
            this.dewPoint = dewPoint;
        }

        public double calculateWindChill() {
            double factor = Math.pow(windSpeed, 0.16);
            return 35.74d + (0.6215d * temperature) - 
                    (35.75d * (factor)) + 
                    (0.4275 * (dewPoint * (factor)));
        }

    }
}

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