JTable输入关键动作

Question

I am developing an application using JTable for inventory management.

The action is, by typing the item code in a JTextField and by pressing enter key, the details of that code should come to JTable . And there I have to type the quantity and press enter to calculate the amount.

But now by giving item code the details come to the JTable , and I can type the quantity, but there by pressing enter key JTable focus goes to the next row and no calculation is being done. I am using MySQL and Java in Netbeans.

I found some code. This code you given earlier for this problem

private void createKeybindings(JTable table) {
    table.getInputMap(JComponent.WHEN_ANCESTOR_OF_FOCUSED_COMPONENT).put(KeyStroke.getKeyStroke(KeyEvent.VK_ENTER, 0), "Enter");
    table.getActionMap().put("Enter", new AbstractAction() {
        @Override
        public void actionPerformed(ActionEvent ae) {

        }
    });
}

But I have no clear idea about this code.

• Please explain where to add this code or there are any other codes to do this.
• Please tell me step by step where i put this code in Netbeans IDE (I follow this link https://web.archive.org/web/20120626114430/http://java.sun.com/products/jfc/tsc/special_report/kestrel/keybindings.html , but I can't understand it).

Thank you...

Answer 1

If you have three columns like Quantity, Price, Amount then you could override the setValueAt(...) method of your TableModel with code like:

public void setValueAt(Object value, int row, int column)
{
    super.setValueAt(value, row, column);

    if (column == 0 || column == 1)
    {
        TableModel model = (TableModel)e.getSource();
        int quantity = ((Integer)model.getValueAt(row, 0)).intValue();
        double price = ((Double)model.getValueAt(row, 1)).doubleValue();
        Double value = new Double(quantity * price);
        model.setValueAt(value, row, 2);
    }
}