当我运行程序时，JLabel 不显示，但显示在 NetBeans 中的 GUI 生成器中

Question

我在 NetBeans 中使用 Java GUI 构建器（拖放），并在容器中添加了 JLabels、文本字段和按钮。但是，仅显示文本字段和按钮，而不显示 JLabels。

/*
 * Click nbfs://nbhost/SystemFileSystem/Templates/Licenses/license-default.txt to change this license
 * Click nbfs://nbhost/SystemFileSystem/Templates/GUIForms/JPanel.java to edit this template
 */
package View;

/**
 *
 * @author Yash
 */
public class ModifyTransactionPanel extends javax.swing.JPanel {

    private MainFrame mainFrame;
    /**
     * Creates new form HomePanel
     */
    public ModifyTransactionPanel(MainFrame mainFrame) {
        this.mainFrame = mainFrame;
        initComponents();
    }

    /**
     * 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() {

        menuPanel = new javax.swing.JPanel();
        menuItems = new javax.swing.JPanel();
        backButton = new javax.swing.JButton();
        logoutButton = new javax.swing.JButton();
        exitButton = new javax.swing.JButton();
        expenseTrackerLogoContainer = new javax.swing.JPanel();
        expenseTrackerLogo = new javax.swing.JLabel();
        modifyTransactionPanelContainer = new javax.swing.JPanel();
        addIncomeTitleLabel = new javax.swing.JLabel();
        searchBar = new javax.swing.JTextField();
        searchButton = new java.awt.Button();
        searchTransactionIDButton = new java.awt.Label();
        searchResultContainer = new javax.swing.JPanel();
        resultTransactionID = new java.awt.Label();
        resultTransactionTypeLabel = new java.awt.Label();
        resultTransactionIDLabel = new java.awt.Label();
        resultNameLabel = new java.awt.Label();
        resultName = new javax.swing.JTextField();
        resultDateLabel = new java.awt.Label();
        resultDate = new javax.swing.JTextField();
        resultCategoryLabel = new java.awt.Label();
        resultCategory = new javax.swing.JTextField();
        resultAmountLabel = new java.awt.Label();
        resultAmount = new javax.swing.JTextField();
        updateTransactionButton = new java.awt.Button();
        addIncomeButton1 = new java.awt.Button();

        setLayout(new org.netbeans.lib.awtextra.AbsoluteLayout());

        menuPanel.setBackground(new java.awt.Color(0, 0, 0));
        menuPanel.setLayout(new org.netbeans.lib.awtextra.AbsoluteLayout());

        menuItems.setBackground(new java.awt.Color(0, 0, 0));
        menuItems.setFont(new java.awt.Font("Arial", 0, 14)); // NOI18N
        menuItems.setLayout(new java.awt.GridLayout(3, 0));

        backButton.setBackground(new java.awt.Color(0, 0, 0));
        backButton.setFont(new java.awt.Font("Arial", 0, 18)); // NOI18N
        backButton.setForeground(new java.awt.Color(255, 255, 255));
        backButton.setText("Back");
        backButton.setBorder(null);
        backButton.setBorderPainted(false);
        backButton.setCursor(new java.awt.Cursor(java.awt.Cursor.HAND_CURSOR));
        menuItems.add(backButton);

        logoutButton.setBackground(new java.awt.Color(0, 0, 0));
        logoutButton.setFont(new java.awt.Font("Arial", 0, 18)); // NOI18N
        logoutButton.setForeground(new java.awt.Color(255, 255, 255));
        logoutButton.setText("Logout");
        logoutButton.setBorder(null);
        logoutButton.setBorderPainted(false);
        logoutButton.setCursor(new java.awt.Cursor(java.awt.Cursor.HAND_CURSOR));
        menuItems.add(logoutButton);

        exitButton.setBackground(new java.awt.Color(0, 0, 0));
        exitButton.setFont(new java.awt.Font("Arial", 0, 18)); // NOI18N
        exitButton.setForeground(new java.awt.Color(255, 255, 255));
        exitButton.setText("Exit");
        exitButton.setBorder(null);
        exitButton.setBorderPainted(false);
        exitButton.setCursor(new java.awt.Cursor(java.awt.Cursor.HAND_CURSOR));
        exitButton.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                exitButtonActionPerformed(evt);
            }
        });
        menuItems.add(exitButton);

        menuPanel.add(menuItems, new org.netbeans.lib.awtextra.AbsoluteConstraints(0, 270, 370, 730));

        expenseTrackerLogo.setIcon(new javax.swing.ImageIcon(getClass().getResource("/expenseTrackerLogo.jpg"))); // NOI18N
        expenseTrackerLogo.setOpaque(true);

        javax.swing.GroupLayout expenseTrackerLogoContainerLayout = new javax.swing.GroupLayout(expenseTrackerLogoContainer);
        expenseTrackerLogoContainer.setLayout(expenseTrackerLogoContainerLayout);
        expenseTrackerLogoContainerLayout.setHorizontalGroup(
            expenseTrackerLogoContainerLayout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addComponent(expenseTrackerLogo, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
        );
        expenseTrackerLogoContainerLayout.setVerticalGroup(
            expenseTrackerLogoContainerLayout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addComponent(expenseTrackerLogo, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
        );

        menuPanel.add(expenseTrackerLogoContainer, new org.netbeans.lib.awtextra.AbsoluteConstraints(0, 0, 370, 270));

        add(menuPanel, new org.netbeans.lib.awtextra.AbsoluteConstraints(0, 0, 370, 1000));

        modifyTransactionPanelContainer.setBackground(new java.awt.Color(255, 255, 255));
        modifyTransactionPanelContainer.setForeground(new java.awt.Color(0, 0, 0));

        addIncomeTitleLabel.setBackground(new java.awt.Color(255, 255, 255));
        addIncomeTitleLabel.setFont(new java.awt.Font("Arial", 1, 36)); // NOI18N
        addIncomeTitleLabel.setForeground(new java.awt.Color(0, 0, 0));
        addIncomeTitleLabel.setHorizontalAlignment(javax.swing.SwingConstants.CENTER);
        addIncomeTitleLabel.setText("ModifyTransaction");

        searchBar.setBackground(new java.awt.Color(255, 255, 255));
        searchBar.setFont(new java.awt.Font("Arial", 0, 14)); // NOI18N

        searchButton.setBackground(new java.awt.Color(0, 0, 0));
        searchButton.setCursor(new java.awt.Cursor(java.awt.Cursor.HAND_CURSOR));
        searchButton.setFont(new java.awt.Font("Arial", 0, 18)); // NOI18N
        searchButton.setForeground(new java.awt.Color(255, 255, 255));
        searchButton.setLabel("Search");
        searchButton.setName(""); // NOI18N
        searchButton.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                searchButtonActionPerformed(evt);
            }
        });

        searchTransactionIDButton.setFont(new java.awt.Font("Arial", 0, 20)); // NOI18N
        searchTransactionIDButton.setText("Search Transaction ID");

        searchResultContainer.setBackground(new java.awt.Color(255, 255, 255));
        searchResultContainer.setForeground(new java.awt.Color(255, 255, 255));

        resultTransactionID.setAlignment(java.awt.Label.CENTER);
        resultTransactionID.setFont(new java.awt.Font("Arial", 1, 20)); // NOI18N
        resultTransactionID.setText("INC000001");

        resultTransactionTypeLabel.setFont(new java.awt.Font("Arial", 1, 20)); // NOI18N
        resultTransactionTypeLabel.setText("(Income)");

        resultTransactionIDLabel.setFont(new java.awt.Font("Arial", 0, 20)); // NOI18N
        resultTransactionIDLabel.setText("Transaction ID:");

        resultNameLabel.setFont(new java.awt.Font("Arial", 0, 20)); // NOI18N
        resultNameLabel.setText("Income Name");

        resultName.setBackground(new java.awt.Color(255, 255, 255));
        resultName.setFont(new java.awt.Font("Arial", 0, 14)); // NOI18N

        resultDateLabel.setFont(new java.awt.Font("Arial", 0, 20)); // NOI18N
        resultDateLabel.setText("Date (in dd/mm/yyyy format)");

        resultDate.setBackground(new java.awt.Color(255, 255, 255));
        resultDate.setFont(new java.awt.Font("Arial", 0, 14)); // NOI18N

        resultCategoryLabel.setFont(new java.awt.Font("Arial", 0, 20)); // NOI18N
        resultCategoryLabel.setText("Category");

        resultCategory.setBackground(new java.awt.Color(255, 255, 255));
        resultCategory.setFont(new java.awt.Font("Arial", 0, 14)); // NOI18N

        resultAmountLabel.setFont(new java.awt.Font("Arial", 0, 20)); // NOI18N
        resultAmountLabel.setText("Amount");

        resultAmount.setBackground(new java.awt.Color(255, 255, 255));
        resultAmount.setFont(new java.awt.Font("Arial", 0, 14)); // NOI18N

        updateTransactionButton.setBackground(new java.awt.Color(0, 0, 0));
        updateTransactionButton.setCursor(new java.awt.Cursor(java.awt.Cursor.HAND_CURSOR));
        updateTransactionButton.setFont(new java.awt.Font("Arial", 0, 18)); // NOI18N
        updateTransactionButton.setForeground(new java.awt.Color(255, 255, 255));
        updateTransactionButton.setLabel("Update");
        updateTransactionButton.setName(""); // NOI18N
        updateTransactionButton.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                updateTransactionButtonActionPerformed(evt);
            }
        });

        addIncomeButton1.setBackground(new java.awt.Color(0, 0, 0));
        addIncomeButton1.setCursor(new java.awt.Cursor(java.awt.Cursor.HAND_CURSOR));
        addIncomeButton1.setFont(new java.awt.Font("Arial", 0, 18)); // NOI18N
        addIncomeButton1.setForeground(new java.awt.Color(255, 255, 255));
        addIncomeButton1.setLabel("Delete");
        addIncomeButton1.setName(""); // NOI18N
        addIncomeButton1.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                addIncomeButton1ActionPerformed(evt);
            }
        });

        javax.swing.GroupLayout searchResultContainerLayout = new javax.swing.GroupLayout(searchResultContainer);
        searchResultContainer.setLayout(searchResultContainerLayout);
        searchResultContainerLayout.setHorizontalGroup(
            searchResultContainerLayout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGroup(javax.swing.GroupLayout.Alignment.TRAILING, searchResultContainerLayout.createSequentialGroup()
                .addGap(48, 48, 48)
                .addComponent(updateTransactionButton, javax.swing.GroupLayout.PREFERRED_SIZE, 157, javax.swing.GroupLayout.PREFERRED_SIZE)
                .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED, 94, Short.MAX_VALUE)
                .addGroup(searchResultContainerLayout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
                    .addComponent(addIncomeButton1, javax.swing.GroupLayout.Alignment.TRAILING, javax.swing.GroupLayout.PREFERRED_SIZE, 157, javax.swing.GroupLayout.PREFERRED_SIZE)
                    .addComponent(resultTransactionTypeLabel, javax.swing.GroupLayout.Alignment.TRAILING, javax.swing.GroupLayout.PREFERRED_SIZE, 145, javax.swing.GroupLayout.PREFERRED_SIZE))
                .addGap(43, 43, 43))
            .addGroup(searchResultContainerLayout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
                .addGroup(searchResultContainerLayout.createSequentialGroup()
                    .addGap(46, 46, 46)
                    .addGroup(searchResultContainerLayout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING, false)
                        .addGroup(searchResultContainerLayout.createSequentialGroup()
                            .addComponent(resultTransactionIDLabel, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
                            .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
                            .addComponent(resultTransactionID, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE))
                        .addComponent(resultAmount, javax.swing.GroupLayout.DEFAULT_SIZE, 406, Short.MAX_VALUE)
                        .addComponent(resultAmountLabel, javax.swing.GroupLayout.DEFAULT_SIZE, 406, Short.MAX_VALUE)
                        .addComponent(resultCategory, javax.swing.GroupLayout.DEFAULT_SIZE, 406, Short.MAX_VALUE)
                        .addComponent(resultCategoryLabel, javax.swing.GroupLayout.DEFAULT_SIZE, 406, Short.MAX_VALUE)
                        .addComponent(resultDate, javax.swing.GroupLayout.DEFAULT_SIZE, 406, Short.MAX_VALUE)
                        .addComponent(resultDateLabel, javax.swing.GroupLayout.DEFAULT_SIZE, 406, Short.MAX_VALUE)
                        .addComponent(resultName, javax.swing.GroupLayout.DEFAULT_SIZE, 406, Short.MAX_VALUE)
                        .addComponent(resultNameLabel, javax.swing.GroupLayout.DEFAULT_SIZE, 406, Short.MAX_VALUE))
                    .addContainerGap(47, Short.MAX_VALUE)))
        );
        searchResultContainerLayout.setVerticalGroup(
            searchResultContainerLayout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGroup(javax.swing.GroupLayout.Alignment.TRAILING, searchResultContainerLayout.createSequentialGroup()
                .addGap(20, 20, 20)
                .addComponent(resultTransactionTypeLabel, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
                .addGap(441, 441, 441)
                .addGroup(searchResultContainerLayout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
                    .addComponent(updateTransactionButton, javax.swing.GroupLayout.PREFERRED_SIZE, 42, javax.swing.GroupLayout.PREFERRED_SIZE)
                    .addComponent(addIncomeButton1, javax.swing.GroupLayout.PREFERRED_SIZE, 42, javax.swing.GroupLayout.PREFERRED_SIZE))
                .addGap(30, 30, 30))
            .addGroup(searchResultContainerLayout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
                .addGroup(searchResultContainerLayout.createSequentialGroup()
                    .addGap(22, 22, 22)
                    .addGroup(searchResultContainerLayout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
                        .addComponent(resultTransactionIDLabel, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
                        .addComponent(resultTransactionID, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE))
                    .addGap(28, 28, 28)
                    .addComponent(resultNameLabel, javax.swing.GroupLayout.PREFERRED_SIZE, 27, Short.MAX_VALUE)
                    .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
                    .addComponent(resultName, javax.swing.GroupLayout.DEFAULT_SIZE, 35, Short.MAX_VALUE)
                    .addGap(18, 18, 18)
                    .addComponent(resultDateLabel, javax.swing.GroupLayout.PREFERRED_SIZE, 27, Short.MAX_VALUE)
                    .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
                    .addComponent(resultDate, javax.swing.GroupLayout.DEFAULT_SIZE, 36, Short.MAX_VALUE)
                    .addGap(24, 24, 24)
                    .addComponent(resultCategoryLabel, javax.swing.GroupLayout.PREFERRED_SIZE, 27, Short.MAX_VALUE)
                    .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
                    .addComponent(resultCategory, javax.swing.GroupLayout.DEFAULT_SIZE, 36, Short.MAX_VALUE)
                    .addGap(23, 23, 23)
                    .addComponent(resultAmountLabel, javax.swing.GroupLayout.DEFAULT_SIZE, 35, Short.MAX_VALUE)
                    .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
                    .addComponent(resultAmount, javax.swing.GroupLayout.DEFAULT_SIZE, 34, Short.MAX_VALUE)
                    .addGap(121, 121, 121)))
        );

        javax.swing.GroupLayout modifyTransactionPanelContainerLayout = new javax.swing.GroupLayout(modifyTransactionPanelContainer);
        modifyTransactionPanelContainer.setLayout(modifyTransactionPanelContainerLayout);
        modifyTransactionPanelContainerLayout.setHorizontalGroup(
            modifyTransactionPanelContainerLayout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGroup(modifyTransactionPanelContainerLayout.createSequentialGroup()
                .addContainerGap(374, Short.MAX_VALUE)
                .addGroup(modifyTransactionPanelContainerLayout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
                    .addGroup(javax.swing.GroupLayout.Alignment.TRAILING, modifyTransactionPanelContainerLayout.createSequentialGroup()
                        .addGroup(modifyTransactionPanelContainerLayout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
                            .addComponent(searchTransactionIDButton, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
                            .addGroup(javax.swing.GroupLayout.Alignment.TRAILING, modifyTransactionPanelContainerLayout.createSequentialGroup()
                                .addComponent(searchBar, javax.swing.GroupLayout.PREFERRED_SIZE, 250, javax.swing.GroupLayout.PREFERRED_SIZE)
                                .addGap(24, 24, 24)
                                .addComponent(searchButton, javax.swing.GroupLayout.PREFERRED_SIZE, 132, javax.swing.GroupLayout.PREFERRED_SIZE)))
                        .addGap(350, 350, 350))
                    .addGroup(javax.swing.GroupLayout.Alignment.TRAILING, modifyTransactionPanelContainerLayout.createSequentialGroup()
                        .addComponent(addIncomeTitleLabel, javax.swing.GroupLayout.PREFERRED_SIZE, 355, javax.swing.GroupLayout.PREFERRED_SIZE)
                        .addGap(374, 374, 374))))
            .addGroup(modifyTransactionPanelContainerLayout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
                .addGroup(javax.swing.GroupLayout.Alignment.TRAILING, modifyTransactionPanelContainerLayout.createSequentialGroup()
                    .addContainerGap(327, Short.MAX_VALUE)
                    .addComponent(searchResultContainer, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
                    .addContainerGap(304, Short.MAX_VALUE)))
        );
        modifyTransactionPanelContainerLayout.setVerticalGroup(
            modifyTransactionPanelContainerLayout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGroup(modifyTransactionPanelContainerLayout.createSequentialGroup()
                .addGap(90, 90, 90)
                .addComponent(addIncomeTitleLabel, javax.swing.GroupLayout.PREFERRED_SIZE, 87, javax.swing.GroupLayout.PREFERRED_SIZE)
                .addGap(37, 37, 37)
                .addComponent(searchTransactionIDButton, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
                .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
                .addGroup(modifyTransactionPanelContainerLayout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
                    .addComponent(searchBar, javax.swing.GroupLayout.DEFAULT_SIZE, 35, Short.MAX_VALUE)
                    .addComponent(searchButton, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE))
                .addGap(713, 713, 713))
            .addGroup(modifyTransactionPanelContainerLayout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
                .addGroup(javax.swing.GroupLayout.Alignment.TRAILING, modifyTransactionPanelContainerLayout.createSequentialGroup()
                    .addContainerGap(309, Short.MAX_VALUE)
                    .addComponent(searchResultContainer, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
                    .addContainerGap(130, Short.MAX_VALUE)))
        );

        add(modifyTransactionPanelContainer, new org.netbeans.lib.awtextra.AbsoluteConstraints(370, 0, 1130, 1000));
    }// </editor-fold>                        

    private void exitButtonActionPerformed(java.awt.event.ActionEvent evt) {                                           
        // TODO add your handling code here:
        System.exit(0);
    }                                          

    private void updateTransactionButtonActionPerformed(java.awt.event.ActionEvent evt) {                                                        
        // TODO add your handling code here:
        mainFrame.showTransactionPanel();
    }                                                       

    private void searchButtonActionPerformed(java.awt.event.ActionEvent evt) {                                             
        // TODO add your handling code here:
    }                                            

    private void addIncomeButton1ActionPerformed(java.awt.event.ActionEvent evt) {                                                 
        // TODO add your handling code here:
    }                                                


    // Variables declaration - do not modify                     
    private java.awt.Button addIncomeButton1;
    private javax.swing.JLabel addIncomeTitleLabel;
    private javax.swing.JButton backButton;
    private javax.swing.JButton exitButton;
    private javax.swing.JLabel expenseTrackerLogo;
    private javax.swing.JPanel expenseTrackerLogoContainer;
    private javax.swing.JButton logoutButton;
    private javax.swing.JPanel menuItems;
    private javax.swing.JPanel menuPanel;
    private javax.swing.JPanel modifyTransactionPanelContainer;
    private javax.swing.JTextField resultAmount;
    private java.awt.Label resultAmountLabel;
    private javax.swing.JTextField resultCategory;
    private java.awt.Label resultCategoryLabel;
    private javax.swing.JTextField resultDate;
    private java.awt.Label resultDateLabel;
    private javax.swing.JTextField resultName;
    private java.awt.Label resultNameLabel;
    private java.awt.Label resultTransactionID;
    private java.awt.Label resultTransactionIDLabel;
    private java.awt.Label resultTransactionTypeLabel;
    private javax.swing.JTextField searchBar;
    private java.awt.Button searchButton;
    private javax.swing.JPanel searchResultContainer;
    private java.awt.Label searchTransactionIDButton;
    private java.awt.Button updateTransactionButton;
    // End of variables declaration                   
}

我尝试检查所有内容的可访问性是否为真，结果是真的

Answer 1

您不仅仅是添加 JLabels；您还添加了

java.awt.Label

组件：

private java.awt.Label resultAmountLabel;

不要这样做。不要将重量级 AWT 组件（例如 Labels）与轻量级 Swing GUI 混合在一起。相反，每个

java.awt.Label

都应该被声明并初始化为

javax.swing.JLabel

。