問題描述

在 Netbeans 中，我使用 GUI Builder 將 JTable 插入到我的應用程序中.

到目前為止，我只有一個類 (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

}

每當用戶更改表格中的數據時，我都想獲取該單元格的舊值(可選)和新值.

為了獲取這些數據，我嘗試實現一個事件監聽器:

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.");
        }
    };

然后我將這個 CellEditorListener 分配給表格(它的單元格編輯器):

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

到目前為止有效.但它還不能讓我檢測到這個單元格的舊值和新值.我還需要做什么?

非常感謝您！

推薦答案

但它還不能讓我檢測到這個單元格的舊值和新值.我還需要做什么?

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 來監聽變化更容易，但它仍然存在無法訪問舊值的問題.

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.

查看表格單元偵聽器，了解可讓您訪問的解決方案舊值"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".

這篇關于JTable:檢測單元格數據變化的文章就介紹到這了，希望我們推薦的答案對大家有所幫助，也希望大家多多支持html5模板網！