java - 基本 GUI 出现问题

Question

首先，我想说我已经搜索了这些论坛以及其他论坛来寻找我的问题的答案。我对 Java 和一般编程都很陌生。经过几个小时的努力，我想寻求一些帮助。

我正在尝试打开一个带有菜单栏的窗口(稍后会有一些图形)。这些选项是 3 个下拉菜单，选择后将执行任务。文件菜单允许我保存、加载和退出程序。现在，剩下的只需打印到屏幕上，让我知道大部分工作正在发挥作用。现在，我想对其进行设置，以便当我单击“创建卖家”选项时，它将打开一个包含 3 个字段的新对话框。我想在其中一个中输入一个字符串，在另外两个中输入两个 double 。然后我会将它们存储为变量并将它们发送到另一个函数。我已经在这部分上停留太久了。请记住，虽然这个问题之前可能已经得到解答，但我认为我对 Java 的能力还不够，还无法理解答案。如果这要求还不算过分的话，请尝试为我简化一下。谢谢!

这是我正在上的类(class)。如果您需要，请随意要求更少或更多。

package seller;

import java.awt.Dimension;
import java.awt.GridLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JMenu;
import javax.swing.JMenuBar;
import javax.swing.JMenuItem;
import javax.swing.JOptionPane;
import javax.swing.JPanel;
import javax.swing.JFileChooser;
import javax.swing.JTextField;





import datastore.Meteorite;
import datastore.continents;
import datastore.customers;

import java.io.File;
import java.util.ArrayList;
import java.util.Scanner;


public class BaseFrame extends JFrame implements ActionListener
{
    private static final long serialVersionUID = 1L;

    JFileChooser myChooser = new JFileChooser(".");

    JMenuItem menuItemSave;
    JMenuItem menuItemLoad;
    JMenuItem menuItemExit;
    JMenuItem menuItemCreateSeller;
    JMenuItem menuItemUpdateSeller;
    JMenuItem menuItemRemoveSeller;
    JMenuItem menuItemCreateMeteorite;
    JMenuItem menuItemUpdateMeteorite;
    JMenuItem menuItemRemoveMeteorite;
    JMenuItem menuItemCreateOneLine;
    continents worldMap = new continents();
    boolean[][] mapArray = null;

    int selection = 1;
    String shopName = null;
    Map myMap= new Map();
    Scanner myScanner = new Scanner(System.in);
    Menu myMenu = new Menu();   
    seller seller= new seller();
    Meteorites myMeteorite = new Meteorites();
    customers sellers= new customers(0,0,"test");
    customers buyers= new customers(0, 0, "test");
    ArrayList <Meteorite> myMeteorites =  new ArrayList<Meteorite>();
    ArrayList <customers> mySellers= new ArrayList<customers>();
    ArrayList <customers> myBuyers= new ArrayList<customers>();
    customers people= new customers(0,0,"test");


    public void makeGui()
    {
        this.setTitle("Phase 3");

        JMenuBar mb = new JMenuBar();
        this.setJMenuBar(mb);

        //Load and Save used from class example
        JMenu fileMenu = new JMenu("File");
        mb.add(fileMenu);

        menuItemSave = new JMenuItem("Save");
        menuItemSave.addActionListener(this);

        menuItemLoad = new JMenuItem("Load");
        menuItemLoad.addActionListener(this);

        menuItemExit = new JMenuItem("Exit");
        menuItemExit.addActionListener(this);

        fileMenu.add(menuItemSave);
        fileMenu.add(menuItemLoad);
        fileMenu.add(menuItemExit);


        //seller menu

        JMenu sellerMenu = new JMenu("Seller");
        mb.add(sellerMenu);

        menuItemCreateSeller = new JMenuItem("Create Seller");
        menuItemCreateSeller.addActionListener(this);

        menuItemUpdateSeller = new JMenuItem("Update Seller");
        menuItemUpdateSeller.addActionListener(this);

        menuItemRemoveSeller = new JMenuItem("Remove Seller");
        menuItemRemoveSeller.addActionListener(this);

        sellerMenu.add(menuItemCreateSeller);
        sellerMenu.add(menuItemUpdateSeller);
        sellerMenu.add(menuItemRemoveSeller);

        //handle meteorite menu

        JMenu handleMeteoriteMenu = new JMenu("Handle Meteorite");
        mb.add(handleMeteoriteMenu);

        menuItemCreateMeteorite = new JMenuItem("Create Meteorite");
        menuItemCreateMeteorite.addActionListener(this);

        menuItemUpdateMeteorite = new JMenuItem("Update Meteorite");
        menuItemUpdateMeteorite.addActionListener(this);

        menuItemRemoveMeteorite = new JMenuItem("Remove Meteorite");
        menuItemRemoveMeteorite.addActionListener(this);

        menuItemCreateOneLine = new JMenuItem("Create Meteorite(1 line)");
        menuItemCreateOneLine.addActionListener(this);

        handleMeteoriteMenu.add(menuItemCreateMeteorite);
        handleMeteoriteMenu.add(menuItemUpdateMeteorite);
        handleMeteoriteMenu.add(menuItemRemoveMeteorite);
        handleMeteoriteMenu.add(menuItemCreateOneLine);


        JPanel tPanel = new JPanel();
        this.add(tPanel);
        this.pack();
        this.setSize(new Dimension(640,480));
        this.setVisible(true);


    }
    String myName;
    double myLong;
    double myLat;
    @Override
    public void actionPerformed(ActionEvent e) 
    {

        Object source=null;
        source=e.getSource();   

        if (source == menuItemLoad)
        {

            mapArray = worldMap.createMap();

            myChooser.setFileSelectionMode(JFileChooser.FILES_AND_DIRECTORIES);
            int result = myChooser.showOpenDialog(this);

            //if user clicked Cancel button, return
            if (result == JFileChooser.CANCEL_OPTION)
                System.exit(1);

            File myFile = myChooser.getSelectedFile(); //get file

            //display error if invalid
            if ( ( myFile == null) || (myFile.getName().equals("")))
            {
                JOptionPane.showMessageDialog(this, "Invalid Name", "Invalid Name", JOptionPane.ERROR_MESSAGE);
                System.exit(1);
            }

            myMeteorites= myMeteorite.loadMeteorite(myMeteorites, myFile);
            sellers.loadSeller(mySellers);
            buyers.loadBuyer(myBuyers);

        }

        if (source == menuItemSave)
        {
            mapArray = worldMap.createMap();

            myChooser.setFileSelectionMode(JFileChooser.FILES_AND_DIRECTORIES);
            int result = myChooser.showOpenDialog(this);

            //if user clicked Cancel button, return
            if (result == JFileChooser.CANCEL_OPTION)
                System.exit(1);

            File myFile = myChooser.getSelectedFile(); //get file

            //display error if invalid
            if ( ( myFile == null) || (myFile.getName().equals("")))
            {
                JOptionPane.showMessageDialog(this, "Invalid Name", "Invalid Name", JOptionPane.ERROR_MESSAGE);
                System.exit(1);
            }

            myMeteorites= myMeteorite.saveMeteorite(myMeteorites, myFile);
            sellers.saveSeller(mySellers);
            buyers.saveBuyer(myBuyers);

        }

        if (source == menuItemExit)
        {
            System.exit(1); //exit system
        }

        if (source == menuItemCreateSeller)
        {

            JFrame myFrame = new JFrame("Create a Seller");
            JPanel myPanel = new JPanel();
            JLabel myLabel1 = new JLabel();
            JLabel myLabel2 = new JLabel();
            JLabel myLabel3 = new JLabel();
            final JTextField myText1 = new JTextField(30);
            final JTextField myText2 = new JTextField(30);
            final JTextField myText3 = new JTextField(30);
            setDefaultCloseOperation(EXIT_ON_CLOSE);

            myLabel1.setText("Enter Name");
            myLabel2.setText("Enter Longitude");
            myLabel3.setText("Enter Latitude");

            myPanel.add(myLabel1);
            myPanel.add(myText1);       
            myPanel.add(myLabel2);
            myPanel.add(myText2);   
            myPanel.add(myLabel3);
            myPanel.add(myText3);

            myFrame.add(myPanel);
            myFrame.setSize(350,200);
            myFrame.setVisible(true);

            myText1.addActionListener(new ActionListener()
            {

                @Override
                public void actionPerformed(ActionEvent e) 
                {
                    // TODO Auto-generated method stub
                    myName = myText1.getText();
                }

            });

            myName = myText1.getText();
            //myLong = Double.parseDouble(myText2.getText());
            //myLat = Double.parseDouble(myText3.getText());


            System.out.println(myName);
            //mySellers=people.createCust(mySellers, myLong, myLat, myName);
            //mySellers=people.saveSeller(mySellers);       
        }

        if (source == menuItemRemoveSeller)
        {
            System.out.println("remove seller");
        }

        if (source == menuItemUpdateSeller)
        {
            System.out.println("update seller");
        }

        if (source == menuItemCreateMeteorite)
        {
            System.out.println("create meteorite");
        }

        if (source == menuItemUpdateMeteorite)
        {
            System.out.println("updateMeteorite");
        }
        if (source == menuItemRemoveMeteorite)
        {
            System.out.println("remove meteorite");
        }

        if (source == menuItemCreateOneLine)
        {
            System.out.println("create one line");
        }

    }
}

Answer 1

请参阅此示例以了解我正在谈论的内容。虽然我建议不要使用多个框架，但这将适合您想要做的事情。正如 @MadProgrammer 建议的那样，研究创建 JDialogs

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

public class BaseFrame extends JFrame {

    private String name;
    private double value1;
    private double value2;

    private final JMenuBar jMenuBar = new JMenuBar();
    private final JMenu jmOpen = new JMenu("Open");
    JMenuItem menuItemCreateSeller = new JMenuItem("Create Seller");
    InnerFrame innerFrame = new InnerFrame();

    public BaseFrame() {

        innerFrame.setResizable(false);
        jmOpen.add(menuItemCreateSeller);
        jMenuBar.add(jmOpen);

        setJMenuBar(jMenuBar);

        menuItemCreateSeller.addActionListener(new ActionListener(){
            @Override
            public void actionPerformed(ActionEvent e) {
                innerFrame.setVisible(true);
            }
        });

        setSize(300, 300);
        setDefaultCloseOperation(EXIT_ON_CLOSE);
        setLocationRelativeTo(null);
        setVisible(true);
    }

    public static void main(String[] args) {
        SwingUtilities.invokeLater(new Runnable(){
            @Override
            public void run() {
                Frame frame = new BaseFrame();
            }
        });
    }

    private class InnerFrame extends JFrame {

        JPanel myPanel = new JPanel();
        JLabel myLabel1 = new JLabel("Enter Name");
        JLabel myLabel2 = new JLabel("Enter Longitude");
        JLabel myLabel3 = new JLabel("Enter Latitude");
        JLabel jlblStatus = new JLabel(" ");
        JTextField myText1 = new JTextField(10);
        JTextField myText2 = new JTextField(10);
        JTextField myText3 = new JTextField(10);

        JButton jbtPrint = new JButton("Print");

        public InnerFrame() {

            myPanel.add(myLabel1);
            myPanel.add(myText1);
            myPanel.add(myLabel2);
            myPanel.add(myText2);
            myPanel.add(myLabel3);
            myPanel.add(myText3);

            JPanel p1 = new JPanel(new GridLayout(1,2));
            p1.add(jlblStatus);
            p1.add(jbtPrint);
            jlblStatus.setHorizontalAlignment(SwingConstants.LEFT);
            jlblStatus.setForeground(Color.RED);

            jbtPrint.addActionListener(new ActionListener(){
                @Override
                public void actionPerformed(ActionEvent e) {
                    try {
                        name = myText1.getText();
                        value1 = Double.parseDouble(myText2.getText());
                        value2 = Double.parseDouble(myText3.getText());
                        System.out.println(name);
                        double total = value1 + value2;
                        System.out.println(total);

                        setVisible(false);
                    } catch (NumberFormatException ex) {
                        jlblStatus.setText("Invalid Input");
                    }
                }
            });

            add(myPanel, BorderLayout.CENTER);
            add(p1, BorderLayout.SOUTH);
            setSize(180, 220);
            setLocationRelativeTo(null);
            setVisible(false);

        }
    }
}