How to Implement Linked Checkboxes in a JTable for Multiple Row Selection?

Selecting Multiple Rows and Checking All Checkboxes

In a JTable, where one column comprises non-editable text while the other features checkbox controls for boolean values, a common requirement is to link the checkboxes. This entails that when multiple rows are selected and any checkbox is unchecked, all other selected checkboxes also become unchecked. Similarly, if a checkbox is checked, all selected checkboxes should follow suit.

Implementing the Linked Checkboxes

Implementing a DataModel Class:

• Extend the DefaultTableModel class to create a custom DataModel with overridden methods:

  • getColumnClass(int columnIndex): Return the class type for the checkbox column (Boolean.class).
  • isCellEditable(int row, int column): Allow cell editing only in the checkbox column.

Creating a Control Panel with Buttons:

• Add a control panel with buttons for clearing or checking all selected checkboxes.

Creating a SelectionAction Class:

• Implement an action class to handle button events.
• The constructor accepts a boolean value representing the desired action (clear or check).
• The actionPerformed method iterates over selected rows and updates the checkbox values accordingly.

Sample Code:**

The following code snippet demonstrates the implementation:

import java.awt.*;
import java.awt.event.ActionEvent;
import javax.swing.*;
import javax.swing.DefaultListSelectionModel;
import javax.swing.table.DefaultTableModel;

public class MultipleRowSelection extends JPanel {

    private static final int CHECK_COL = 1;
    private static final Object[][] DATA = {
        {"One", Boolean.TRUE}, {"Two", Boolean.FALSE},
        {"Three", Boolean.TRUE}, {"Four", Boolean.FALSE},
        {"Five", Boolean.TRUE}, {"Six", Boolean.FALSE},
        {"Seven", Boolean.TRUE}, {"Eight", Boolean.FALSE},
        {"Nine", Boolean.TRUE}, {"Ten", Boolean.FALSE}};
    private static final String[] COLUMNS = {"Number", "CheckBox"};
    private DataModel dataModel = new DataModel(DATA, COLUMNS);
    private JTable table = new JTable(dataModel);
    private DefaultListSelectionModel selectionModel;

    public MultipleRowSelection() {
        super(new BorderLayout());
        this.add(new JScrollPane(table));
        this.add(new ControlPanel(), BorderLayout.SOUTH);
        table.setPreferredScrollableViewportSize(new Dimension(250, 175));
        selectionModel = (DefaultListSelectionModel) table.getSelectionModel();
    }

    private class DataModel extends DefaultTableModel {

        public DataModel(Object[][] data, Object[] columnNames) {
            super(data, columnNames);
        }

        @Override
        public Class<?> getColumnClass(int columnIndex) {
            if (columnIndex == CHECK_COL) {
                return getValueAt(0, CHECK_COL).getClass();
            }
            return super.getColumnClass(columnIndex);
        }

        @Override
        public boolean isCellEditable(int row, int column) {
            return column == CHECK_COL;
        }
    }

    private class ControlPanel extends JPanel {

        public ControlPanel() {
            this.add(new JLabel("Selection:"));
            this.add(new JButton(new SelectionAction("Clear", false)));
            this.add(new JButton(new SelectionAction("Check", true)));
        }
    }

    private class SelectionAction extends AbstractAction {

        boolean value;

        public SelectionAction(String name, boolean value) {
            super(name);
            this.value = value;
        }

        @Override
        public void actionPerformed(ActionEvent e) {
            for (int i = 0; i < dataModel.getRowCount(); i++) {
                if (selectionModel.isSelectedIndex(i)) {
                    dataModel.setValueAt(value, i, CHECK_COL);
                }
            }
        }
    }

    private static void createAndShowUI() {
        JFrame frame = new JFrame("MultipleRowSelection");
        frame.add(new MultipleRowSelection());
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.pack();
        frame.setLocationRelativeTo(null);
        frame.setVisible(true);
    }

    public static void main(String[] args) {
        java.awt.EventQueue.invokeLater(new Runnable() {

            @Override
            public void run() {
                createAndShowUI();
            }
        });
    }
}

Conclusion

By implementing these classes and action listeners, it becomes possible to select multiple rows in a JTable and toggle the corresponding checkboxes collectively, enhancing the user experience and streamlining data manipulation.

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