java向表中添加值并将其添加到主窗体

Question

我希望能够将多个选项卡添加到我的程序中。选项卡将包含jTable组件。我希望能够单击Addanewtab，输入一些信息，向表中添加一些值，然后将其插入tabbedPane。我下面的SSCE可以做到这一点，但当您尝试添加第二个SSCE时，该表不会显示在对话框中。有人能帮我找出原因吗？（仅供参考：我正在使用Netbeans和GUI设计器）

import javax.swing.JLabel;
import javax.swing.JScrollPane;
import javax.swing.JTabbedPane;
import javax.swing.JTable;


public class tabtest extends javax.swing.JFrame {

    public tabtest() {
        initComponents();
    }

    @SuppressWarnings("unchecked")
    // <editor-fold defaultstate="collapsed" desc="Generated Code">                          
    private void initComponents() {

        addTabDialog = new javax.swing.JDialog();
        titleTextBox = new javax.swing.JTextField();
        jLabel1 = new javax.swing.JLabel();
        addTabConfirmButton = new javax.swing.JButton();
        jScrollPane1 = new javax.swing.JScrollPane();
        jTable1 = new javax.swing.JTable();
        jLabel2 = new javax.swing.JLabel();
        tabPane = new javax.swing.JTabbedPane();
        addTabButton = new javax.swing.JButton();

        addTabDialog.setBounds(new java.awt.Rectangle(0, 0, 400, 400));

        titleTextBox.setText("New Tab");

        jLabel1.setText("Tab Title");

        addTabConfirmButton.setText("Confirm");
        addTabConfirmButton.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                addTabConfirmButtonActionPerformed(evt);
            }
        });

        jTable1.setModel(new javax.swing.table.DefaultTableModel(
            new Object [][] {
                {null, null, null},
                {null, null, null},
                {null, null, null},
                {null, null, null}
            },
            new String [] {
                "assignment", "points", "score"
            }
        ) {
            Class[] types = new Class [] {
                java.lang.String.class, java.lang.Integer.class, java.lang.Integer.class
            };

            public Class getColumnClass(int columnIndex) {
                return types [columnIndex];
            }
        });
        jScrollPane1.setViewportView(jTable1);

        javax.swing.GroupLayout addTabDialogLayout = new javax.swing.GroupLayout(addTabDialog.getContentPane());
        addTabDialog.getContentPane().setLayout(addTabDialogLayout);
        addTabDialogLayout.setHorizontalGroup(
            addTabDialogLayout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGroup(addTabDialogLayout.createSequentialGroup()
                .addGap(87, 87, 87)
                .addComponent(jLabel1)
                .addGap(18, 18, 18)
                .addGroup(addTabDialogLayout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
                    .addComponent(titleTextBox, javax.swing.GroupLayout.PREFERRED_SIZE, 96, javax.swing.GroupLayout.PREFERRED_SIZE)
                    .addGroup(addTabDialogLayout.createSequentialGroup()
                        .addGap(6, 6, 6)
                        .addComponent(addTabConfirmButton)))
                .addContainerGap(javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE))
            .addGroup(javax.swing.GroupLayout.Alignment.TRAILING, addTabDialogLayout.createSequentialGroup()
                .addContainerGap(43, Short.MAX_VALUE)
                .addComponent(jScrollPane1, javax.swing.GroupLayout.PREFERRED_SIZE, 314, javax.swing.GroupLayout.PREFERRED_SIZE)
                .addGap(32, 32, 32))
        );
        addTabDialogLayout.setVerticalGroup(
            addTabDialogLayout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGroup(addTabDialogLayout.createSequentialGroup()
                .addGap(77, 77, 77)
                .addGroup(addTabDialogLayout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
                    .addComponent(titleTextBox, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
                    .addComponent(jLabel1))
                .addGap(18, 18, 18)
                .addComponent(jScrollPane1, javax.swing.GroupLayout.PREFERRED_SIZE, 133, javax.swing.GroupLayout.PREFERRED_SIZE)
                .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
                .addComponent(addTabConfirmButton)
                .addGap(212, 212, 212))
        );

        jLabel2.setText("This is a new Tab");

        setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);

        addTabButton.setText("add new tab");
        addTabButton.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                addTabButtonActionPerformed(evt);
            }
        });
        tabPane.addTab("+", addTabButton);

        javax.swing.GroupLayout layout = new javax.swing.GroupLayout(getContentPane());
        getContentPane().setLayout(layout);
        layout.setHorizontalGroup(
            layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGroup(layout.createSequentialGroup()
                .addContainerGap()
                .addComponent(tabPane, javax.swing.GroupLayout.PREFERRED_SIZE, 326, javax.swing.GroupLayout.PREFERRED_SIZE)
                .addContainerGap(64, Short.MAX_VALUE))
        );
        layout.setVerticalGroup(
            layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGroup(layout.createSequentialGroup()
                .addContainerGap()
                .addComponent(tabPane, javax.swing.GroupLayout.PREFERRED_SIZE, 178, javax.swing.GroupLayout.PREFERRED_SIZE)
                .addContainerGap(111, Short.MAX_VALUE))
        );

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

    private void addTabButtonActionPerformed(java.awt.event.ActionEvent evt) {                                             
        addTabDialog.setLocationRelativeTo(null);
        addTabDialog.setVisible(true);        
    }                                            

    private void addTabConfirmButtonActionPerformed(java.awt.event.ActionEvent evt) {                                                    
        JTable table=jTable1;
        tabPane.insertTab(titleTextBox.getText(),null,new JScrollPane(table),"Hello",tabPane.getTabCount()-1);
        //tabPane.addTab(titleTextBox.getText(),newTab);
        tabPane.setSelectedIndex(tabPane.getTabCount()-1);
        addTabDialog.setVisible(false);
    }                                                   

    public static void main(String args[]) {
       java.awt.EventQueue.invokeLater(new Runnable() {
            public void run() {
                new tabtest().setVisible(true);
            }
        });
    }
    // Variables declaration - do not modify                     
    private javax.swing.JButton addTabButton;
    private javax.swing.JButton addTabConfirmButton;
    private javax.swing.JDialog addTabDialog;
    private javax.swing.JLabel jLabel1;
    private javax.swing.JLabel jLabel2;
    private javax.swing.JScrollPane jScrollPane1;
    private javax.swing.JTable jTable1;
    private javax.swing.JTabbedPane tabPane;
    private javax.swing.JTextField titleTextBox;
    // End of variables declaration                   
}

还有。。。使用javaFX2比使用swing更好吗？这会让事情变得更容易吗？它和swing中的编码有很大不同吗？有很多东西要学吗

Answer 1

您只需创建一个JTable，然后尝试在整个程序中重复使用它，并且由于一个组件只能在GUI中显示一次，这意味着JTable只能在一个位置可见。相反，当需要一个新的JTable时，您需要创建一个新的JTable

作为概念证明，如果在addTabConfirmButtonActionPerformed(...)方法中更改此行：

  JTable table = jTable1;

为此：

  // !!!!! changes
  // JTable table = jTable1;
  JTable table = new JTable(); //!!
  table.setModel(jTable1.getModel()); //!!
  // !!!!! end of changes

您将看到新的JTables。请注意，对于您的代码来说，这不是一个合适的解决方案，因为每个JTable现在将共享相同的模型，我认为这不是您想要的。您应该创建另一个扩展DefaultTableModel或AbstractTableModel的类，并为每个新JTable提供该类的实例

---

编辑
你在评论中问：

As for the same models im going to create an AbstractTableModel, but couldnt I just apply that model to jTable1 in my code, and then it will be the same as table?

添加到jTable1的模型将应用于jTable1引用的对象，不多也不少。如果希望所有JTables在每个单元格中显示完全相同的信息，那么它们都可以共享相同的模型。我怀疑你想要这个

(I might be confused about what a table model is, is it when column 2 contains int, column 1 contains strings etc? or is it all of the data in it too?)

表模型保存表的数据及其逻辑结构的列数、行数等

请看一下JTable Tutorial了解所有血淋淋的细节