Java：无法使JFrame正常工作

问题描述

我正在研究几天的程序遇到了麻烦。 基本上，我想做的是创建一个GUI以显示用户对HTML文件的输入。 我想要做的是让程序在frame1的按钮上循环，基于它们具有多少条机场支路，以获取所有用户输入：机场名称，纬度和经度。 任何帮助表示赞赏

package project4;

import java.awt.event.*;
import java.util.Scanner;
import javax.swing.*;



public class MainClass {

public static final int FRAME_WIDTH = 500;
public static final int FRAME_HEIGHT = 500;

    public static void main(String[] args) { new MainClass();}

    // Fields
        private int legs;
        private double speed;
        private double totTime = 0;
        private double totDist = 0;
        private double lat;
        private double lng;
        private String name;
        Airport user;

    public MainClass()  {

        // Variable Declarations

        // Frame window 1 : Contains Legs and Speed
        JFrame frame = new JFrame("Legs and Speed");
        JPanel panel = new JPanel();
        JLabel labelLegs = new JLabel("Legs:");
        JLabel labelSpeed = new JLabel("Speed:");
        JTextField tf = new JTextField(5); // Leg field
        JTextField tf1 = new JTextField(5); // Speed field
        JButton button = new JButton("Ok");


        JFrame frame1 = new JFrame();
        JLabel label1 = new JLabel("Airport Name:");
        JLabel label2 = new JLabel("Latitude:");
        JLabel label3 = new JLabel("Longitude");
        JPanel panel1 = new JPanel();
        JTextField tf2 = new JTextField(5);
        JTextField tf3 = new JTextField(5);
        JTextField tf4 = new JTextField(5);
        JButton button1 = new JButton("Ok");

            // Add elements to panel and then to frame
            panel.add(labelLegs);
            panel.add(tf); // Leg field
            panel.add(labelSpeed);
            panel.add(tf1); // Speed field
            panel.add(button);
            frame.add(panel);
        frame.setVisible(true);
        frame.setSize(FRAME_WIDTH, FRAME_HEIGHT);
        frame.setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE);

        class legsAndSpeedListener implements ActionListener
        {
            public void actionPerformed(ActionEvent e) {
                legs = Integer.parseInt(tf.getText());
                speed = Double.parseDouble(tf1.getText());
                    frame.setVisible(false);
                    frame1.setVisible(true);
            }
        }
        ActionListener listener = new legsAndSpeedListener();
        button.addActionListener(listener);

        // Arrays for Latitude and Longitude and Airport Name
        String[] airportName = new String[legs];
        double[] latitudeArr = new double[legs];
        double[] longitudeArr = new double[legs];




            panel1.add(label1);
            panel1.add(tf2);
            panel1.add(label2);
            panel1.add(tf3);
            panel1.add(label3);
            panel1.add(tf4);
            panel1.add(button1);
            frame1.add(panel1);
        frame1.setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE);
        frame1.setSize(FRAME_WIDTH, FRAME_HEIGHT);

            class portItinerary implements ActionListener
            {
                public void actionPerformed(ActionEvent e) {
                    name = tf2.getText();
                    lat = Double.parseDouble(tf3.getText());
                    lng = Double.parseDouble(tf4.getText());
                }
            }
            ActionListener listener1 = new portItinerary();
            button1.addActionListener(listener1);

            frame1.setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE);

        for (int i = 0; i < legs; i++)
        {
            latitudeArr[i] = lat;
            longitudeArr[i] = lng;
            airportName[i] = name;
        }
    }
}   





    package project4;
import java.awt.event.*;
import javax.swing.*;

public class Airport extends MainClass {

    public static final double EARTH_RADIUS = 10800 / Math.PI;
    public static final double RAD = Math.PI / 180;

    // Fields
    public static double Lat;
    public static double Long;
    public static String ID;
    public static double Distance;
    public static int legs;

    public Airport()
    {

    }

    public void setWindow()
    {


    }




    // Mutators
    public static void setDistance(double lat1, double long1, double lat2, double long2)
    {
        // Sin converter
        double distance1;
        double sinLat1 = lat1 * RAD;
        double sinLat2 = lat2 * RAD;

        // Cos converter
        double cosLat1 = lat1 * RAD;
        double cosLat2 = lat2 * RAD;
        double cosLong1 = long1 * RAD;
        double cosLong2 = long2 * RAD;


        // Calculation of the great circle distance based on two coordinates in nautical miles
        distance1 = (Math.sin(sinLat1) * Math.sin(sinLat2) + Math.cos(cosLat1) * Math.cos(cosLat2) * Math.cos((cosLong1 - cosLong2)));
        Distance = EARTH_RADIUS * Math.acos(distance1);
    }

    // Accessors
    public static double getLat() {return Lat;}
    public static double getDistance(){return Distance;}
    public static double getLong(){return Long;}
    public static String getID() {return ID;}

}