編譯和運行，但它不存在

Question

我想從包文件夾（它的工作原理和設置正確）運行我的JFrames。問題是它編譯和運行，但我什麼都看不到，因爲沒有錯誤，我不知道要修復什麼。我可能忽略了一些非常小的東西，但我無法找到它。這段代碼是我的Main類和我將要使用的第一個JFrame類。任何關於如何從一個包最有效地實現JFrame的想法將非常感激。

import GroupProject.GUI.Package.*; 
import javax.swing.*; 
import java.awt.*; 
import java.io.*; 


public class TestGuiApp1 
{ 

    public static void main(String[] Args) 
    { 
     // Gets screen dimensions to be used to center JFrame 
     Toolkit tk = Toolkit.getDefaultToolkit(); 
     Dimension d = tk.getScreenSize(); 

     //creates new Main Menu Frame from GUI packages 
     new MainMenuFrame(); 

     //constraints and unlocking/locking features 
     //setLocation((d.width/2)-350, (d.height/2)-350); 
     //setResizable(false); 


    } 

} 

// JFrame的啓動類從包

package GroupProject.GUI.Package; 

    import javax.swing.*; 
    import java.awt.*; 
    import java.awt.event.*; 
    import com.sun.java.swing.plaf.nimbus.*; 

    public class MainMenuFrame extends JFrame 
    { 
     private JButton guess_word, 
         guess_number, 
         player_stats; 
     private JLabel pic_label = new JLabel(new ImageIcon("Question-Mark-Man.jpg")); 

     public MainMenuFrame() 
     {  

      try { 

       UIManager.setLookAndFeel(new NimbusLookAndFeel() 
       { 
        public UIDefaults getDefaults() 
        { 
         UIDefaults ret = super.getDefaults(); 
         ret.put("defaultFont", 
         new Font(Font.MONOSPACED, Font.BOLD, 16)); 
         return ret; 
       } 
       }); 

      JPanel p1 = new JPanel(); 
      JPanel p2 = new JPanel(); 

      ButtonListener listener = new ButtonListener(); 
      // Panel Size 
      setPreferredSize(new Dimension(550, 300)); 
      // Background Color 
      setBackground(new Color(127, 157, 217)); 
      p1.setBackground(new Color(127, 157, 217)); 


      // -------------------- Buttons ------------------- 

      // Guess a word Button 
      guess_word = new JButton("Guess a word", new ImageIcon("word game.png")); 
      guess_word.setFont(new Font("ariel narrow",Font.BOLD,24)); 
      guess_word.addActionListener(listener); 
      p1.add(guess_word); 

      // Guess a number Button 
      guess_number = new JButton("Guess a number", new ImageIcon("number game.png")); 
      guess_number.setFont(new Font("ariel narrow",Font.BOLD,24)); 
      guess_number.addActionListener(listener); 
      p1.add(guess_number); 

      // View player stats button 
      player_stats = new JButton("Player Stats", new ImageIcon("stats2.png")); 
      player_stats.setFont(new Font("ariel narrow",Font.BOLD,24)); 
      player_stats.addActionListener(listener); 
      p1.add(player_stats); 
      // --------------------------------------------------- 



      // ============ Layouts using group layout ============ 
      GroupLayout layout = new GroupLayout(this); 

      this.setLayout(layout); 
      layout.setHorizontalGroup(layout.createParallelGroup(GroupLayout.Alignment.LEADING) 
       .addGroup(layout.createSequentialGroup() 
       .addContainerGap() 
       .addGroup(layout.createParallelGroup(GroupLayout.Alignment.TRAILING, false) 
        .addComponent(guess_word, GroupLayout.PREFERRED_SIZE, 280, 
          GroupLayout.PREFERRED_SIZE) 
        .addComponent(guess_number, GroupLayout.PREFERRED_SIZE, 280, 
          GroupLayout.PREFERRED_SIZE) 
        .addComponent(player_stats, GroupLayout.PREFERRED_SIZE, 280, 
          GroupLayout.PREFERRED_SIZE)) 
        .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.UNRELATED) 
        .addComponent(p2, GroupLayout.DEFAULT_SIZE, 
          GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE) 
        .addContainerGap())); 

      layout.setVerticalGroup(layout.createParallelGroup(GroupLayout.Alignment.LEADING) 
       .addGroup(layout.createSequentialGroup() 
       .addContainerGap() 
       .addGroup(layout.createParallelGroup(GroupLayout.Alignment.TRAILING, false) 
        .addComponent(p2, GroupLayout.Alignment.LEADING, GroupLayout.DEFAULT_SIZE, 
           GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE) 
        .addGroup(GroupLayout.Alignment.LEADING, layout.createSequentialGroup() 
        .addComponent(guess_word, GroupLayout.PREFERRED_SIZE, 60, 
         GroupLayout.PREFERRED_SIZE) 
        .addPreferredGap(LayoutStyle.ComponentPlacement.UNRELATED) 
        .addComponent(guess_number, GroupLayout.PREFERRED_SIZE, 60, 
          GroupLayout.PREFERRED_SIZE) 
        .addPreferredGap(LayoutStyle.ComponentPlacement.UNRELATED) 
        .addComponent(player_stats, GroupLayout.PREFERRED_SIZE, 60, 
          GroupLayout.PREFERRED_SIZE))) 

        .addContainerGap(239, Short.MAX_VALUE))); 
      // =================================================== 
      p2.add(pic_label); 
      } catch (Exception ex) 
      { 
       throw new Error(ex); 
      } 
     } 


     private class ButtonListener implements ActionListener 
     { 
      public void actionPerformed(ActionEvent e) 
      { 
       //need to set values to remember what game the user wants to play 
       // before it goes to the SelectPlayerTypeFrame 
       if (e.getSource() == guess_word) 
        ;//new MainMenu(); 

       if (e.getSource() == guess_number) 
        ; // new MainMenu(); 

       if (e.getSource() == player_stats) 
       ;//new MainMenu(); 
      } 
     } 

    } 

Answer 1

你在哪裏調用調用setVisible（真）在JFrame的？

即

myFrame.setVisible(true); 

或在您的情況：

this.setVisible(true); // this is not necessary but here for clarity 

還要注意，畢竟組件已被添加到GUI和調用pack（在另一注意到在這之後應該叫在這個頁面上回答）。

您將要經過的Java Swing教程瞭解如何創建Swing程序有點作爲這方面的知識將是非常有用的你：Swing Tutorials

另外，我強烈建議你不要使用NetBeans產生Swing代碼給你，至少不是在遊戲的這個階段，除非你更瞭解Swing。代碼生成器非常適用於快速和骯髒的代碼創建，但如果您不知道Swing的細節和特性，那麼如果您想要創建比最基本的GUI更多的東西，通常會遇到困難。我從經驗得到的這個結論。

Answer 2

您從未將您的框架設置爲可見，並且您不需要調用pack()就可以將其框架尺寸告訴其子組件。

JFrame frame = new MainMenuFrame(); 
frame.pack(); 
frame.setVisible(true);