checkbox in jTable

[Anand Karia]

Can any one tell me why checkboxes are not appering in my jTable. Where I am wrong?

I am using NetBeansIDE 3.6. Firstly i drag jTable then manually adjust it according to my need

Thanks in advance.

  
import javax.swing.table.*;
public class jTableTest extends javax.swing.JFrame {
    javax.swing.table.DefaultTableModel t_Dtl=new javax.swing.table.DefaultTableModel();
    /** Creates new form jTableTest */
    public jTableTest() {
        initComponents();
        setGrid_Detail();
    }
 
//My function to set grid
    private void setGrid_Detail() {
        t_Dtl.addColumn((Object) "Col-A");
        t_Dtl.addColumn((Object) "Col-B");
        t_Dtl.addColumn(new Boolean("Col-C"));
        t_Dtl.addColumn((Object) "Col-D");
        myTable.setModel(t_Dtl);
        addRow();
        }  
    private void addRow() {
        try {
            t_Dtl.addRow( new Object [] {"","","",""});
        }
        catch(Exception e) {
        }
    }    
    /** This method is called from within the constructor to
     * initialize the form.
     * WARNING: Do NOT modify this code. The content of this method is
     * always regenerated by the Form Editor.
     */
 
//These are all autogenerated codes.
    private void initComponents() {
        jScrollPane1 = new javax.swing.JScrollPane();
        myTable = new javax.swing.JTable();
 
        getContentPane().setLayout(null);
 
        addWindowListener(new java.awt.event.WindowAdapter() {
            public void windowClosing(java.awt.event.WindowEvent evt) {
                exitForm(evt);
            }
        });
 
        myTable.setModel(new javax.swing.table.DefaultTableModel(
            new Object [][] {
                {null, null, null, null},
                {null, null, null, null},
                {null, null, null, null},
                {null, null, null, null}
            },
            new String [] {
                "Col 1", "Col 2", "Col 3", "Col 4"
            }
        ) {
            Class[] types = new Class [] {
                java.lang.Object.class, java.lang.Object.class, java.lang.Boolean.class, java.lang.Object.class
            };
 
            public Class getColumnClass(int columnIndex) {
                return types [columnIndex];
            }
        });
        jScrollPane1.setViewportView(myTable);
 
        getContentPane().add(jScrollPane1);
        jScrollPane1.setBounds(20, 40, 360, 150);
 
        java.awt.Dimension screenSize = java.awt.Toolkit.getDefaultToolkit().getScreenSize();
        setBounds((screenSize.width-400)/2, (screenSize.height-300)/2, 400, 300);
    }
    
    /** Exit the Application */
    private void exitForm(java.awt.event.WindowEvent evt) {
        System.exit(0);
    }
    
    /**
     * @param args the command line arguments
     */
    public static void main(String args[]) {
        new jTableTest().show();
    }
    
    
    // Variables declaration - do not modify
    private javax.swing.JScrollPane jScrollPane1;
    private javax.swing.JTable myTable;
    // End of variables declaration
    
}

[Michael Dunn]

can't help with netbeans-generated code, but here's a simple demo

import java.awt.*;
import javax.swing.*;
import javax.swing.table.*;
 
class Testing extends JFrame
{
  String colNames[] = {"CheckBox", "String", "String"};
  Object[][] data = {};
  DefaultTableModel dtm;
  public Testing()
  {
    setLocation(400,100);
    setDefaultCloseOperation(EXIT_ON_CLOSE);
    dtm = new DefaultTableModel(data,colNames);
    JTable table = new JTable(dtm);
    JScrollPane sp = new JScrollPane(table);
    TableColumn tc = table.getColumnModel().getColumn(0);
    tc.setCellEditor(table.getDefaultEditor(Boolean.class));
    tc.setCellRenderer(table.getDefaultRenderer(Boolean.class));
    getContentPane().add(sp);
    for(int x = 0; x < 5; x++)
    {
      dtm.addRow(new Object[]{new Boolean(false),"Row "+(x+1)+" Col 2","Row "+(x+1)+" Col 3"});
    }
    pack();
  }
  public static void main (String[] args){new Testing().setVisible(true);}
}

[Anand Karia]

I thank you very much Michael Dunn.

Your these line of code solve my problem.

  
        TableColumn tc = tblDetail.getColumnModel().getColumn(7);
        tc.setCellEditor(tblDetail.getDefaultEditor(Boolean.class));
        tc.setCellRenderer(tblDetail.getDefaultRenderer(Boolean.class));