JTable:检测单元格数据变化

2022-01-15 00:00:00 events event-handling java swing jtable

在 Netbeans 中，我使用 GUI Builder 将 JTable 插入到我的应用程序中.

到目前为止，我只有一个类 (CustomerDB):

I have just one class (CustomerDB) so far which is:

package CustomerDB;

import [...];

public class CustomerDB extends javax.swing.JFrame {

    CellEditorListener ChangeNotification = new CellEditorListener() {
        public void editingCanceled(ChangeEvent e) {
            System.out.println("The user canceled editing.");
        }

        public void editingStopped(ChangeEvent e) {
            System.out.println("The user stopped editing successfully.");
        }
    };

    public CustomerDB() {
        customerTable = new javax.swing.JTable();
        customerTable.setModel(new javax.swing.table.DefaultTableModel(
            new Object [][] {
                {null, null, null, null},
                {null, null, null, null},
                {null, null, null, null},
                {null, null, null, null},
                {null, null, null, null},
                {null, null, null, null},
                {null, null, null, null},
                {null, null, null, null},
                {null, null, null, null},
                {null, null, null, null}
            },
            new String [] {
                "ID", "Name", "Address", "Phone"
            }
        ) {
            Class[] types = new Class [] {
                java.lang.String.class, java.lang.String.class, java.lang.String.class, java.lang.String.class
            };

            public Class getColumnClass(int columnIndex) {
                return types [columnIndex];
            }
        });
        customerTable.getDefaultEditor(String.class).addCellEditorListener(ChangeNotification);
    } 

    public static void main(String args[]) {
        java.awt.EventQueue.invokeLater(new Runnable() {
            public void run() {
                new CustomerDB().setVisible(true);
            }
        });
    }

    // Variables declaration - do not modify
    [...]
    private javax.swing.JTable customerTable;
    [...]
    // End of variables declaration

}

每当用户更改表格中的数据时，我都想获取该单元格的旧值(可选)和新值.

为了获取这些数据，我尝试实现一个事件监听器:

In order to get this data, I tried to implement an event listener:

    CellEditorListener ChangeNotification = new CellEditorListener() {
        public void editingCanceled(ChangeEvent e) {
            System.out.println("The user canceled editing.");
        }

        public void editingStopped(ChangeEvent e) {
            System.out.println("The user stopped editing successfully.");
        }
    };

然后我将这个 CellEditorListener 分配给表格(它的单元格编辑器):

    customerTable.getDefaultEditor(String.class).addCellEditorListener(ChangeNotification);

到目前为止有效.但它还不能让我检测到这个单元格的旧值和新值.我还需要做什么?

非常感谢您！

推荐答案

但它还不能让我检测到这个单元格的旧值和新值.我还需要做什么?

But it doesn't yet enable me to detect the old and the new value of this cell. What else do I have to do?

使用 TableModelListener 来监听变化更容易，但它仍然存在无法访问旧值的问题.

It is easier to use a TableModelListener to listen for changes but it still has the problem of not being able to access the old value.

查看表格单元侦听器，了解可让您访问的解决方案旧值"和新值".

Check out the Table Cell Listener for a solution that gives you access to the "old value" as well as the "new value".

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