JTable. Deleting rows. Consume the event to not get dispatched further

Question

I needed to delete rows from a JTable on the delete key-press. So the use case is quite simple, the user select some rows, press the delete key, the rows get deleted. The co

Answer 1

This is MadProgrammer's code but I modified it to work with multiple selected rows at once instead of one by one:

    // Assume table is a JTable instance
    InputMap inputMap = table.getInputMap(JTable.WHEN_FOCUSED);
    ActionMap actionMap = table.getActionMap();

    inputMap.put(KeyStroke.getKeyStroke(KeyEvent.VK_DELETE, 0), "DeleteRow");
    actionMap.put("DeleteRow", new AbstractAction()
    {
        @Override
        public void actionPerformed(ActionEvent e)
        {
            int[] row = table.getSelectedRows();

            for (int i = 0; i < row.length; i++)
            {
                ((DefaultTableModel) table.getModel()).removeRow(row[i] - i * 1);
            }
        }
    });

Answer 2

Use key bindings instead...

InputMap im = table.getInputMap(JTable.WHEN_FOCUSED);
ActionMap am = table.getActionMap();

im.put(KeyStroke.getKeyStroke(KeyEvent.VK_DELETE, 0), "DeleteRow");
am.put("DeleteRow", new AbstractAction() {
    @Override
    public void actionPerformed(ActionEvent e) {

        System.out.println("Delete row");
        int row = table.getSelectedRow();

        if (row > -1) {

            DefaultTableModel model = (DefaultTableModel) table.getModel();
            model.removeRow(row);

        }

    }
});

(I borrowed mKorbel data for my test, so my test was using a DefaultTableModel, you will need to cast to the model you are using).

Also, if you editing, this may still fire, so you will need to check for that

Answer 3

• your core for removing rows is wrong, have to start with Max index, otherwise deleted unselected row,

code example

import java.awt.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.*;
import javax.swing.table.*;

public class RemoveAddRows extends JFrame {

    private static final long serialVersionUID = 1L;
    private Object[] columnNames = {"Type", "Company", "Shares", "Price"};
    private Object[][] data = {
        {"Buy", "IBM", new Integer(1000), new Double(80.50)},
        {"Sell", "MicroSoft", new Integer(2000), new Double(6.25)},
        {"Sell", "Apple", new Integer(3000), new Double(7.35)},
        {"Buy", "Nortel", new Integer(4000), new Double(20.00)},
        {"Buy", "IBM", new Integer(1000), new Double(80.50)},
        {"Sell", "MicroSoft", new Integer(2000), new Double(6.25)},
        {"Sell", "Apple", new Integer(3000), new Double(7.35)},
        {"Buy", "Nortel", new Integer(4000), new Double(20.00)},
        {"Buy", "IBM", new Integer(1000), new Double(80.50)},
        {"Sell", "MicroSoft", new Integer(2000), new Double(6.25)},
        {"Sell", "Apple", new Integer(3000), new Double(7.35)},
        {"Buy", "Nortel", new Integer(4000), new Double(20.00)}
    };
    private JTable table;
    private DefaultTableModel model;

    public RemoveAddRows() {
        model = new DefaultTableModel(data, columnNames) {

            private static final long serialVersionUID = 1L;

            @Override
            public Class getColumnClass(int column) {
                return getValueAt(0, column).getClass();
            }
        };
        table = new JTable(model);
        table.setPreferredScrollableViewportSize(table.getPreferredSize());
        table.setSelectionMode(ListSelectionModel.MULTIPLE_INTERVAL_SELECTION);
        JScrollPane scrollPane = new JScrollPane(table);
        add(scrollPane);
        JButton button1 = new JButton("Remove all rows");
        button1.addActionListener(new ActionListener() {

            public void actionPerformed(ActionEvent arg0) {
                int[] selectedRows = table.getSelectedRows();
                for (int i = selectedRows.length - 1; i > -1; i--) {
                    model.removeRow(selectedRows[i]);
                }
                /*if (model.getRowCount() > 0) {
                for (int i = model.getRowCount() - 1; i > -1; i--) {
                model.removeRow(i);
                }
                }*/
                System.out.println("model.getRowCount() --->" + model.getRowCount());
            }
        });
        JButton button2 = new JButton("Add new rows");
        button2.addActionListener(new ActionListener() {

            public void actionPerformed(ActionEvent arg0) {
                Object[] data0 = {"Buy", "IBM", new Integer(1000), new Double(80.50)};
                model.addRow(data0);
                Object[] data1 = {"Sell", "MicroSoft", new Integer(2000), new Double(6.25)};
                model.addRow(data1);
                Object[] data2 = {"Sell", "Apple", new Integer(3000), new Double(7.35)};
                model.addRow(data2);
                Object[] data3 = {"Buy", "Nortel", new Integer(4000), new Double(20.00)};
                model.addRow(data3);
                System.out.println("model.getRowCount() --->" + model.getRowCount());
            }
        });
        JPanel southPanel = new JPanel();
        southPanel.add(button1);
        southPanel.add(button2);
        add(southPanel, BorderLayout.SOUTH);
    }

    public static void main(String[] args) {
        RemoveAddRows frame = new RemoveAddRows();
        frame.setDefaultCloseOperation(EXIT_ON_CLOSE);
        frame.pack();
        frame.setLocationRelativeTo(null);
        frame.setVisible(true);
    }
}

• I'm Win user and never heard beep from Win Platform, have to post an SSCCE