スイング：GUIは私のコンポーネントを表示しません

Question

私はそれがちょっと間違いだと確信していますが、私はそれを見つけることができません。私がServer GUIを起動しているとき、そのコンポーネントは表示されません。私が持っているのは、正しいサイズの空白の白いページだけです。

import java.io.IOException; 
import java.net.ServerSocket; 
import java.net.Socket; 

public class ServerGUI extends javax.swing.JFrame { 

    private ServerSocket server; 
    private int port; 
    private int numberOfObject; 
    private int counter = 1; 
    private ObjectClass[] Object; 
    private Server bss; 
    public static volatile int[] Allocation; 

    public void setServerGUI(Server bss, int port, int numberOfObject, ObjectClass[] Object) { 
     this.bss = bss; 
     this.port = port; 
     this.numberOfObject = numberOfObject; 
     this.Object = Object; 
    } 

    public ServerGUI() { 

     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(ServerGUI.class.getName()).log(java.util.logging.Level.SEVERE, null, ex); 
     } catch (InstantiationException ex) { 
      java.util.logging.Logger.getLogger(ServerGUI.class.getName()).log(java.util.logging.Level.SEVERE, null, ex); 
     } catch (IllegalAccessException ex) { 
      java.util.logging.Logger.getLogger(ServerGUI.class.getName()).log(java.util.logging.Level.SEVERE, null, ex); 
     } catch (javax.swing.UnsupportedLookAndFeelException ex) { 
      java.util.logging.Logger.getLogger(ServerGUI.class.getName()).log(java.util.logging.Level.SEVERE, null, ex); 
     } 
     //</editor-fold> 

     /* 
     * Create and display the form 
     */ 
     java.awt.EventQueue.invokeLater(new Runnable() { 

      public void run() { 
       setVisible(true); 
      } 
     }); 
     initComponents(); 

    } 

    public void startServing() { 
     System.out.println("STARTSERVING"); 
     try { 
      server = new ServerSocket(port); 
     } catch (IOException e1) { 
      System.out.println("IOException in startServing()"); 
     } 
     while (true) { 
      Socket ADClient = null; 

      int free=0; 
      try { 
       ADClient = server.accept(); 
       for (int j = 0; j < numberOfObject; j++) { 
        if ((Allocation[j] == -1)) { 
         free = j; 
         Allocation[free] = counter; 
        } 

       } 
       System.out.println("" + Object[free].getNumber()); 
       new ServerThread(ADClient, counter++, Object[free]).start(); 


      } catch (IOException e) { 
       System.out.println("IOException: server.accept() schlug fehl."); 
      } 
     } 
    } 

    /** 
    * This method is called from within the constructor to initialize the form. 
    * WARNING: Do NOT modify this code. The content of this method is always 
    * regenerated by the Form Editor. 
    */ 
    @SuppressWarnings("unchecked") 
    // <editor-fold defaultstate="collapsed" desc="Generated Code"> 
    private void initComponents() { 

     scrollPaneState1 = new javax.swing.JScrollPane(); 
     textAreaState1 = new javax.swing.JTextArea(); 
     scrollPaneServer1 = new javax.swing.JScrollPane(); 
     textAreaServer1 = new javax.swing.JTextArea(); 
     scrollPaneState2 = new javax.swing.JScrollPane(); 
     textAreaState2 = new javax.swing.JTextArea(); 
     scrollPaneServer2 = new javax.swing.JScrollPane(); 
     textAreaServer2 = new javax.swing.JTextArea(); 
     scrollPaneState3 = new javax.swing.JScrollPane(); 
     textAreaState3 = new javax.swing.JTextArea(); 
     scrollPaneServer3 = new javax.swing.JScrollPane(); 
     textAreaServer3 = new javax.swing.JTextArea(); 
     scrollPaneMain = new javax.swing.JScrollPane(); 
     textAreaMain = new javax.swing.JTextArea(); 
     labelNr1 = new javax.swing.JLabel(); 
     labelNr2 = new javax.swing.JLabel(); 
     labelNr3 = new javax.swing.JLabel(); 
     labelStateResponse1 = new javax.swing.JLabel(); 
     labelStateResponse2 = new javax.swing.JLabel(); 
     labelStateResponse3 = new javax.swing.JLabel(); 
     labelServerResponse1 = new javax.swing.JLabel(); 
     labelServerResponse2 = new javax.swing.JLabel(); 
     labelServerResponse3 = new javax.swing.JLabel(); 
     labelMainResponse = new javax.swing.JLabel(); 
     beendenButton = new javax.swing.JButton(); 
     backButton = new javax.swing.JButton(); 

     setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE); 
     setTitle("Server - Running"); 

     scrollPaneState1.setEnabled(false); 

     textAreaState1.setColumns(20); 
     textAreaState1.setRows(5); 
     scrollPaneState1.setViewportView(textAreaState1); 

     scrollPaneServer1.setEnabled(false); 

     textAreaServer1.setColumns(20); 
     textAreaServer1.setRows(5); 
     scrollPaneServer1.setViewportView(textAreaServer1); 

     scrollPaneState2.setEnabled(false); 

     textAreaState2.setColumns(20); 
     textAreaState2.setRows(5); 
     scrollPaneState2.setViewportView(textAreaState2); 

     scrollPaneServer2.setEnabled(false); 

     textAreaServer2.setColumns(20); 
     textAreaServer2.setRows(5); 
     scrollPaneServer2.setViewportView(textAreaServer2); 

     scrollPaneState3.setEnabled(false); 

     textAreaState3.setColumns(20); 
     textAreaState3.setRows(5); 
     scrollPaneState3.setViewportView(textAreaState3); 

     scrollPaneServer3.setEnabled(false); 

     textAreaServer3.setColumns(20); 
     textAreaServer3.setRows(5); 
     scrollPaneServer3.setViewportView(textAreaServer3); 

     scrollPaneMain.setEnabled(false); 

     textAreaMain.setColumns(20); 
     textAreaMain.setRows(5); 
     scrollPaneMain.setViewportView(textAreaMain); 

     labelNr1.setText("Nr: "); 
     labelNr1.setDoubleBuffered(true); 

     labelNr2.setText("Nr: "); 

     labelNr3.setText("Nr: "); 

     labelStateResponse1.setText("State Respone:"); 

     labelStateResponse2.setText("State Response:"); 

     labelStateResponse3.setText("State Response:"); 

     labelServerResponse1.setText("Server Resonse:"); 

     labelServerResponse2.setText("Server Response:"); 

     labelServerResponse3.setText("Server Response:"); 

     labelMainResponse.setText("Main Response:"); 

     beendenButton.setText("beenden"); 
     beendenButton.addActionListener(new java.awt.event.ActionListener() { 
      public void actionPerformed(java.awt.event.ActionEvent evt) { 
       beendenButtonActionPerformed(evt); 
      } 
     }); 

     backButton.setText("zurück"); 
     backButton.addActionListener(new java.awt.event.ActionListener() { 
      public void actionPerformed(java.awt.event.ActionEvent evt) { 
       backButtonActionPerformed(evt); 
      } 
     }); 

     javax.swing.GroupLayout layout = new javax.swing.GroupLayout(getContentPane()); 
     getContentPane().setLayout(layout); 
     layout.setHorizontalGroup(
      layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING) 
      .addGroup(layout.createSequentialGroup() 
       .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING) 
        .addGroup(layout.createSequentialGroup() 
         .addContainerGap() 
         .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING) 
          .addGroup(layout.createSequentialGroup() 
           .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING) 
            .addComponent(labelNr1) 
            .addComponent(labelStateResponse1)) 
           .addGap(199, 199, 199) 
           .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING) 
            .addComponent(scrollPaneState2, javax.swing.GroupLayout.PREFERRED_SIZE, 268, javax.swing.GroupLayout.PREFERRED_SIZE) 
            .addComponent(labelServerResponse2) 
            .addComponent(labelStateResponse2) 
            .addComponent(labelNr2)) 
           .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED) 
           .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING) 
            .addComponent(scrollPaneState3) 
            .addGroup(layout.createSequentialGroup() 
             .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING) 
              .addComponent(labelServerResponse3) 
              .addComponent(labelStateResponse3) 
              .addComponent(labelNr3)) 
             .addGap(0, 0, Short.MAX_VALUE)))) 
          .addGroup(layout.createSequentialGroup() 
           .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING, false) 
            .addComponent(scrollPaneServer1) 
            .addComponent(scrollPaneState1, javax.swing.GroupLayout.PREFERRED_SIZE, 268, javax.swing.GroupLayout.PREFERRED_SIZE)) 
           .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED) 
           .addComponent(scrollPaneServer2, javax.swing.GroupLayout.PREFERRED_SIZE, 268, javax.swing.GroupLayout.PREFERRED_SIZE) 
           .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED) 
           .addComponent(scrollPaneServer3)) 
          .addGroup(layout.createSequentialGroup() 
           .addComponent(labelServerResponse1) 
           .addGap(738, 738, 738)) 
          .addComponent(scrollPaneMain))) 
        .addGroup(layout.createSequentialGroup() 
         .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING) 
          .addGroup(layout.createSequentialGroup() 
           .addContainerGap() 
           .addComponent(labelMainResponse)) 
          .addGroup(layout.createSequentialGroup() 
           .addGap(326, 326, 326) 
           .addComponent(backButton) 
           .addGap(18, 18, 18) 
           .addComponent(beendenButton))) 
         .addGap(0, 0, Short.MAX_VALUE))) 
       .addContainerGap()) 
     ); 
     layout.setVerticalGroup(
      layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING) 
      .addGroup(javax.swing.GroupLayout.Alignment.TRAILING, layout.createSequentialGroup() 
       .addContainerGap() 
       .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE) 
        .addComponent(labelNr1) 
        .addComponent(labelNr2) 
        .addComponent(labelNr3)) 
       .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED) 
       .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE) 
        .addComponent(labelStateResponse1) 
        .addComponent(labelStateResponse2) 
        .addComponent(labelStateResponse3)) 
       .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED) 
       .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.TRAILING) 
        .addComponent(scrollPaneState2, javax.swing.GroupLayout.PREFERRED_SIZE, 125, javax.swing.GroupLayout.PREFERRED_SIZE) 
        .addComponent(scrollPaneState1, javax.swing.GroupLayout.PREFERRED_SIZE, 125, javax.swing.GroupLayout.PREFERRED_SIZE) 
        .addComponent(scrollPaneState3, javax.swing.GroupLayout.PREFERRED_SIZE, 125, javax.swing.GroupLayout.PREFERRED_SIZE)) 
       .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED) 
       .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE) 
        .addComponent(labelServerResponse1) 
        .addComponent(labelServerResponse2) 
        .addComponent(labelServerResponse3)) 
       .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED) 
       .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING) 
        .addComponent(scrollPaneServer2, javax.swing.GroupLayout.PREFERRED_SIZE, 125, javax.swing.GroupLayout.PREFERRED_SIZE) 
        .addComponent(scrollPaneServer1, javax.swing.GroupLayout.PREFERRED_SIZE, 125, javax.swing.GroupLayout.PREFERRED_SIZE) 
        .addComponent(scrollPaneServer3, javax.swing.GroupLayout.PREFERRED_SIZE, 125, javax.swing.GroupLayout.PREFERRED_SIZE)) 
       .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED) 
       .addComponent(labelMainResponse) 
       .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED) 
       .addComponent(scrollPaneMain, javax.swing.GroupLayout.PREFERRED_SIZE, 125, javax.swing.GroupLayout.PREFERRED_SIZE) 
       .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.UNRELATED) 
       .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE) 
        .addComponent(beendenButton) 
        .addComponent(backButton)) 
       .addContainerGap(javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)) 
     ); 

     pack(); 
    }// </editor-fold> 

    private void beendenButtonActionPerformed(java.awt.event.ActionEvent evt) { 
     System.exit(0); 
    } 

    private void backButtonActionPerformed(java.awt.event.ActionEvent evt) { 
     bss.setVisible(true); 
     this.dispose(); 
    } 

    // Variables declaration - do not modify 
    private javax.swing.JButton backButton; 
    private javax.swing.JButton beendenButton; 
    private javax.swing.JLabel labelNr1; 
    private javax.swing.JLabel labelNr2; 
    private javax.swing.JLabel labelNr3; 
    private javax.swing.JLabel labelMainResponse; 
    private javax.swing.JLabel labelServerResponse1; 
    private javax.swing.JLabel labelServerResponse2; 
    private javax.swing.JLabel labelServerResponse3; 
    private javax.swing.JLabel labelStateResponse1; 
    private javax.swing.JLabel labelStateResponse2; 
    private javax.swing.JLabel labelStateResponse3; 
    private javax.swing.JScrollPane scrollPaneMain; 
    private javax.swing.JScrollPane scrollPaneServer1; 
    private javax.swing.JScrollPane scrollPaneServer2; 
    private javax.swing.JScrollPane scrollPaneServer3; 
    private javax.swing.JScrollPane scrollPaneState1; 
    private javax.swing.JScrollPane scrollPaneState2; 
    private javax.swing.JScrollPane scrollPaneState3; 
    private javax.swing.JTextArea textAreaMain; 
    private javax.swing.JTextArea textAreaServer1; 
    private javax.swing.JTextArea textAreaServer2; 
    private javax.swing.JTextArea textAreaServer3; 
    private javax.swing.JTextArea textAreaState1; 
    private javax.swing.JTextArea textAreaState2; 
    private javax.swing.JTextArea textAreaState3; 
    // End of variables declaration 
} 

このクラスはこっち呼び出される：コードの多く、NetBeansのを使用して持つ欠点の一つだ

ServerGUI bssGUI = new ServerGUI(); 
bssGUI.setServerGUI(this, 4242, object.length,object); 
bssGUI.setVisible(true); 
bssGUI.startServing(); 

Answer 1

私は、このコードはNetBeansので生成されて見ることができるように...それはドラッグアンドドロップの問題であり、機能性をコピーしてページを再設計：-only適切な場所でのビジネス機能..あなたが間違った場所に置いた場合、ビジネス上の機能性を置いている場所に注意してください。そうすれば、同じ問題が再び発生する可能性があります。例えば.. uがリスナーのため のコードを記述している場合

backButton.addActionListener(new java.awt.event.ActionListener() { 
     public void actionPerformed(java.awt.event.ActionEvent evt) { 
      backButtonActionPerformed(evt); 
     } 
    }); 

下記のように正確です。ここで気づくべきことは、メソッド内でurコードをラップし、そのメソッドを呼び出したい場所から呼び出すことです。

とuは、ジミーについて投稿された回答を気にすることができます。私はこのコードを見て、問題を見つけ出すのに時間が無駄になると感じています。ドラッグアンドドロップの問題。

また、コンポーネントは重複してはならず、削除されたがメモリは解放されていない余分なコンポーネントは存在しないはずです。

Answer 2

:)私は見つけることができる唯一のことは、あなたが呼び出す前に、あなたがinitComponents();を呼ぶべきであるということですsetVisible(true);

また、あなたが作成しているログファイルを読むことによって、あなたの例外のいずれかをキャッチされていないことを確認してください（またはプリントラインを追加）

Answer 3

1つのスレッドで初期化を行っていますが、別のスレッド（invokeLaterのコンストラクタでラップされています）でsetVisibleメソッドを呼び出すと思われます。イベントディスパッチャースレッド以外のスレッドからUIスタッフを呼び出すことは、一般的に結果の競合条件の何も言わないことは悪いアプローチです。コンストラクタからinvokeLaterを削除し、代わりにinitalization包むようにしてください：

java.awt.EventQueue.invokeLater(new Runnable() { 
    public void run() { 
     ServerGUI bssGUI = new ServerGUI(); 
     bssGUI.setServerGUI(this, 4242, object.length,object); 
     bssGUI.setVisible(true); 
     bssGUI.startServing(); 
    } 
};