How to add JCheckBox in JTable?

Question

First of all i apologize for my english neglect that i will explain all my problem. First i want JCheckBox in the JTable i have. I am retrieving student id and student name from database in column index 0 and 1. I want third column should be Absent/Present which will initially take whether student is present or absent by JCheckbox Value. Here my code for JTable values : Attendance.java ``` /* * To change this template, choose Tools | Templates * and open the template in the editor. */ package shreesai; import java.sql.Connection; import java.sql.PreparedStatement; import java.sql.ResultSet; import java.util.Vector; /** * * @author Admin */ public class Attendance{ Connection con = Connectdatabase.ConnecrDb(); public Vector getEmployee()throws Exception { Vector> employeeVector = new Vector>(); PreparedStatement pre = con.prepareStatement("select studentid,name from student"); ResultSet rs = pre.executeQuery(); while(rs.next()) { Vector employee =…

Accepted Answer

Start with How to use tables.

Your table model needs several things.

- It needs to return `Boolean.class` from the `getColumnClass` method for the appropriate column. You will need to override this method.

- The method `isCellEditable` will need to return `true` for the table column you want to make editable (so the user can change the value of the column)

- You're table model will need to be capable of holding the value for the column

- Make sure you pass a valid value for the `boolean` column for the row, otherwise it will be `null`

Updated with simple example

```
import java.awt.EventQueue;
import java.util.Vector;
import javax.swing.JFrame;
import javax.swing.JScrollPane;
import javax.swing.JTable;
import javax.swing.UIManager;
import javax.swing.UnsupportedLookAndFeelException;
import javax.swing.table.DefaultTableModel;

public class TableTest {

public static void main(String[] args) {
    new TableTest();
  }

public TableTest() {
    startUI();
  }

public void startUI() {
    EventQueue.invokeLater(new Runnable() {
      @Override
      public void run() {
        try {
          UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
        } catch (ClassNotFoundException | InstantiationException | IllegalAccessException | UnsupportedLookAndFeelException ex) {
          ex.printStackTrace();
        }

MyTableModel model = new MyTableModel();
        model.addRow(new Object[]{0, "Brian", false});
        model.addRow(new Object[]{1, "Ned", false});
        model.addRow(new Object[]{2, "John", false});
        model.addRow(new Object[]{3, "Drogo", false});
        JTable table = new JTable(model);

JFrame frame = new JFrame("Testing");
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.add(new JScrollPane(table));
        frame.pack();
        frame.setLocationRelativeTo(null);
        frame.setVisible(true);
      }
    });
  }

public class MyTableModel extends DefaultTableModel {

public MyTableModel() {
      super(new String[]{"ID", "Name", "Present"}, 0);
    }

@Override
    public Class<?> getColumnClass(int columnIndex) {
      Class clazz = String.class;
      switch (columnIndex) {
        case 0:
          clazz = Integer.class;
          break;
        case 2:
          clazz = Boolean.class;
          break;
      }
      return clazz;
    }

@Override
    public boolean isCellEditable(int row, int column) {
      return column == 2;
    }

@Override
    public void setValueAt(Object aValue, int row, int column) {
      if (aValue instanceof Boolean && column == 2) {
        System.out.println(aValue);
        Vector rowData = (Vector)getDataVector().get(row);
        rowData.set(2, (boolean)aValue);
        fireTableCellUpdated(row, column);
      }
    }

}

}
```

Ps- I would HIGHLY recommend you avoid form editors until you have a better understanding of how Swing works - IMHO

How to add JCheckBox in JTable?

Solution

Problem