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Question

我正在通过 Java 取得进展，并开始了一个“包罗万象”的小项目，将它们拼凑在一起，但我几乎一开始就被一个问题挂断了。

目前，该应用程序基本上只是应该打开一个由三个选项卡组成的 GUI，每个选项卡具有不同的内容；一种用于设计桌面 Activity ，一种用于运行它，一种用于数据库管理。

我相信我已经正确添加了所有组件，但是当我运行它进行测试时，我得到一个空的、未调整大小的应用程序 Pane 。基本上只是调整大小按钮和一条线。我可以调整它的大小，但尽管它显示了菜单栏，但我们没有看到 Pane 、没有选项卡、没有任何内容。我一直在 kajiggering 一次让它们显示，甚至从 netbeans 中的 gui 构建器重建它，并根据生成的代码对其进行改造(我有一些自定义组件要包含并且想学习手动编写 GUI 代码) .

任何人都可以发现我在这里做错了什么吗？

package com.bmagus.tabletop.gui;

import java.awt.GridBagConstraints;
import java.awt.GridBagLayout;
import java.awt.Insets;

import javax.swing.DefaultComboBoxModel;
import javax.swing.JCheckBox;
import javax.swing.JComboBox;
import javax.swing.JFrame;
import javax.swing.JMenu;
import javax.swing.JMenuBar;
import javax.swing.JMenuItem;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.JTabbedPane;
import javax.swing.JTextArea;
import javax.swing.JTextField;
import javax.swing.WindowConstants;


public class GMGui extends JFrame {

    /**
     * 
     */
    private static final long serialVersionUID = 1L;

    public GMGui() {
        initComponents();
        lookAndFeel();
    }

   //Component variables
    private JCheckBox dbSearchMod1;
    private JComboBox pcSelector;
    private JComboBox npcSelector;
    private JMenu fileMenu;
    private JMenu editMenu;
    private JMenu helpMenu;
    private JMenuBar menuBar;
    private JMenuItem fileExit;
    private JPanel designPanel;
    private JPanel runPanel;
    private JPanel dbPanel;
    private JScrollPane designNotesScroll;
    private JScrollPane runNotesScroll;
    private JTabbedPane gmGuiTabs;
    private JTextArea designNotes;
    private JTextArea runNotes;
    private JTextField dbSearchField;

    private void setGbc(GridBagConstraints localGbc, int x, int y, int height, int width, double xweight, double yweight){
       localGbc.gridx=x;
       localGbc.gridy=y;
       localGbc.gridheight=height;
       localGbc.gridwidth=width;
       localGbc.fill = GridBagConstraints.BOTH;
       localGbc.weightx=xweight;
       localGbc.weighty=yweight;
       localGbc.insets = new Insets(20, 20, 20, 20);
   }
   private void lookAndFeel()
    {
       try {
           for (javax.swing.UIManager.LookAndFeelInfo info : javax.swing.UIManager.getInstalledLookAndFeels()) {
               if ("Nimbus".equals(info.getName())) {
                   javax.swing.UIManager.setLookAndFeel(info.getClassName());
                   break;
               }
           }
       } catch (ClassNotFoundException ex) {
           java.util.logging.Logger.getLogger(GMGui.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
       } catch (InstantiationException ex) {
           java.util.logging.Logger.getLogger(GMGui.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
       } catch (IllegalAccessException ex) {
           java.util.logging.Logger.getLogger(GMGui.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
       } catch (javax.swing.UnsupportedLookAndFeelException ex) {
           java.util.logging.Logger.getLogger(GMGui.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
       }
    }
    private void initComponents() {
        GridBagConstraints gbc = new GridBagConstraints();
        GridBagLayout guiLayout = new GridBagLayout();
        gmGuiTabs = new JTabbedPane();
        designPanel = new JPanel();
        designNotesScroll = new JScrollPane();
        designNotes = new JTextArea();
        runPanel = new JPanel();
        runNotesScroll = new JScrollPane();
        runNotes = new JTextArea();
        pcSelector = new JComboBox();
        npcSelector = new JComboBox();
        dbPanel = new JPanel();
        dbSearchField = new JTextField();
        dbSearchMod1 = new JCheckBox();
        menuBar = new JMenuBar();
        fileMenu = new JMenu();
        fileExit = new JMenuItem();
        editMenu = new JMenu();
        helpMenu = new JMenu();

        setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);

        //Campaign Design Tab
        designPanel.setLayout(guiLayout);

        designNotes.setColumns(20);
        designNotes.setRows(5);
        designNotesScroll.setViewportView(designNotes);

        setGbc(gbc, 0,0,5,3,1.0d,1.0d);

        gmGuiTabs.addTab("Campaign Design", designPanel);

        //Run Game tab
        runPanel.setLayout(guiLayout);

        runNotes.setColumns(20);
        runNotes.setRows(5);
        runNotesScroll.setViewportView(runNotes);

        setGbc(gbc, 0,0,5,3,1.0d,1.0d);//Todo

        runPanel.add(runNotesScroll, gbc);

        pcSelector.setModel(new DefaultComboBoxModel(new String[] { "Item 1", "Item 2", "Item 3", "Item 4" }));
        setGbc(gbc,6,0,1,1,0.0d,0.0d);//Todo
        runPanel.add(pcSelector, gbc);

        npcSelector.setModel(new DefaultComboBoxModel(new String[] { "Item 1", "Item 2", "Item 3", "Item 4" }));
        setGbc(gbc,0,1,1,1,0d,0d);//todo
        runPanel.add(npcSelector, gbc);

        gmGuiTabs.addTab("Run Game", runPanel);

        //Database Tab
        dbPanel.setLayout(guiLayout);

        dbSearchField.setText("jTextField1");
        setGbc(gbc,0,0,3,1,0d,0d);//Todo
        dbPanel.add(dbSearchField, gbc);

        dbSearchMod1.setText("jCheckBox1");
        setGbc(gbc,1,0,1,1,0d,0d);//Todo
        dbPanel.add(dbSearchMod1, gbc);

        gmGuiTabs.addTab("Database", dbPanel);

        //MenuBar Elements
        fileMenu.setText("File");

        fileExit.setText("jMenuItem1");
        fileMenu.add(fileExit);

        menuBar.add(fileMenu);

        editMenu.setText("Edit");
        menuBar.add(editMenu);

        helpMenu.setText("Help");
        menuBar.add(helpMenu);

        setJMenuBar(menuBar);
    }                        
}

我不认为它在 main 方法中，但这是我调用和运行 GUI 的方法。

package com.bmagus.tabletop;

import java.awt.EventQueue;

import com.bmagus.tabletop.gui.GMGui;

public class Game {

    public static void main(String[] args){
        EventQueue.invokeLater(new Runnable() {
            @Override
            public void run(){
                GMGui gmgui = new GMGui();
                gmgui.setVisible(true);
            }
        });
    }

}

Answer 1

您没有向您的框架添加任何内容。因此你得到一个空的。因此，在 initComponents 方法的末尾调用 add 方法将您之前创建的组件添加到框架中:

private void initComponents() 
{

    /* ... */

    setJMenuBar(menuBar);
    add(gmGuiTabs); 
    pack(); 
}

这将显示例如您的选项卡式 Pane 。