To make a `JTable` renders a boolean as a checkbox in the table cell we need to tell the table that a cell stores a boolean type of data. To do this we have to implement a `TableModel` for the `JTable` component.

`TableModel`’s `getColumnClass(int columnIndex)` must return the type of data stored in a cell. When it returns that the column stored a `Boolean` data, `JTable` displays a checkbox as the default renderer or editor for that cell.

“`java
package org.kodejava.swing;

import javax.swing.*;
import javax.swing.table.AbstractTableModel;
import java.awt.*;

public class JTableBooleanAsCheckbox extends JPanel {
public JTableBooleanAsCheckbox() {
initializeUI();
}

public static void showFrame() {
JPanel panel = new JTableBooleanAsCheckbox();
panel.setOpaque(true);

JFrame frame = new JFrame("JTable Boolean as Checkbox");
frame.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
frame.setContentPane(panel);
frame.pack();
frame.setVisible(true);
}

public static void main(String[] args) {
SwingUtilities.invokeLater(JTableBooleanAsCheckbox::showFrame);
}

private void initializeUI() {
setLayout(new BorderLayout());
setPreferredSize(new Dimension(500, 500));

JTable table = new JTable(new BooleanTableModel());
table.setFillsViewportHeight(true);
JScrollPane pane = new JScrollPane(table);
add(pane, BorderLayout.CENTER);
}

static class BooleanTableModel extends AbstractTableModel {
String[] columns = {"STUDENT ID", "NAME", "SCORE", "PASSED"};
Object[][] data = {
{"S001", "ALICE", 90.00, Boolean.TRUE},
{"S002", "BOB", 45.50, Boolean.FALSE},
{"S003", "CAROL", 60.00, Boolean.FALSE},
{"S004", "MALLORY", 75.80, Boolean.TRUE}
};

public int getRowCount() {
return data.length;
}

public int getColumnCount() {
return columns.length;
}

public Object getValueAt(int rowIndex, int columnIndex) {
return data[rowIndex][columnIndex];
}

@Override
public String getColumnName(int column) {
return columns[column];
}

// This method is used by the JTable to define the default
// renderer or editor for each cell. For example if you have
// a boolean data it will be rendered as a checkbox. A
// number value is right aligned.
@Override
public Class<?> getColumnClass(int columnIndex) {
return data[0][columnIndex].getClass();
}
}
}
“`

Here is the result of the program:

JTable render Boolean as Checkbox