JCheckBox in JTable column

hi
can someone help me please im new to java, i need to add checkboxs to the last column of my jtable so user can edit that column, all the other columns are populated with data read from txt file.

my code
import java.io.BufferedReader;
import java.io.FileNotFoundException;
import java.io.FileReader;
import java.io.IOException;
import java.util.*;
import javax.swing.*;
import javax.swing.table.*;
import java.awt.*;
import java.awt.event.*;

// This program allows a list of Products to be maintained i.e.
// added, deleted and sorted. The products are displayed in
// a JTable and also maintained in an ArrayList.

// Some criticisms of the code:

// 1. Quite a lot of the code seems concerned with keeping the
// JTable and the ArrayList contents in step. Perhaps there
// is a better way to do this by writing my own
// TableModel.

// 2. No data validation is implmented

// 3. The design does not conform to the MVC pattern

// 4. Only one sort order (by product name) is possible.
// To make it possible to sort into other orders e.g.
// by price it would be necessary to use a Comparator object.

// 5. The ArrayList used does not use generics

class StockEnquiries implements Comparable {
private String name;
private int phone;
private String branch;

public StockEnquiries(String n, int p, String b) {
name = n;
phone = p;
branch = b;
}
public StockEnquiries() {

}
public String getName() {
return name;
}
public int getPhone() {
return phone;
}
public String getBranch() {
return branch;
}
// compareTo() allows Product instances in a container
// (e.g. an ArrayList) to be sorted by Collections.sort().

// It can only sort things in one order (e.g. ascending order of
// name). Need to investigate the use of Comparator objects to
// allow different sort orders to be defined.

public int compareTo(Object o) {
StockEnquiries temp = (StockEnquiries) o;

// Strings already implement compareTo() so just use that
return (name.compareTo(temp.name));
}
}
public class GUI1 extends JFrame {

// A container for the Product instances
ArrayList enquiries = new ArrayList();

// GUI bits and bobs
JPanel panInput = new JPanel(new GridLayout(2,1)),
panAdd = new JPanel(),
panDelSort = new JPanel();

JTextField txtName = new JTextField(10),
txtPhone = new JTextField(5);
JTextField txtBranch = new JTextField(100);
JButton btnAdd = new JButton("Add"),
btnDelete = new JButton("Delete"),
btnSort = new JButton("Sort Products");

JTable tab = new JTable();

// The DefaultTableModel will allow the contents of the
// JTable to be manipulated.
DefaultTableModel tabMod = new DefaultTableModel();

StockEnquiries [] initialEnquiries = {new StockEnquiries(),
new StockEnquiries(),
new StockEnquiries()};

public GUI1() {
super("stock enquiries list");
tab.setModel(tabMod);
tabMod.addColumn("Name");
tabMod.addColumn("Phone");
tabMod.addColumn("Branch");
tabMod.addColumn("time");
tabMod.addColumn("enquiry");
tabMod.addColumn("dealt with");



btnAdd.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent ae) {
addStockEnquiries();
}
});

btnDelete.setToolTipText("Select the records to delete first");
btnDelete.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent ae) {
deleteStockEnquiries();
}
});
btnSort.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent ae) {
sortEnquiries();
}
});

panAdd.add(btnAdd);
panAdd.add(new JLabel("Product name:"));
panAdd.add(txtName);
panAdd.add(new JLabel("Phone Number:"));
panAdd.add(txtPhone);
panDelSort.add(btnDelete);
panDelSort.add(btnSort);
panInput.add(panAdd);
panInput.add(panDelSort);
getContentPane().add(panInput, BorderLayout.SOUTH);
getContentPane().add(new JScrollPane(tab));
loadInitialEnquiries();
}
// Delete a product from the ArrayList and from the JTable
public void deleteStockEnquiries() {
int [] rows = tab.getSelectedRows();
for (int i = 0; i < rows.length; i++) {
tabMod.removeRow(rows[i] - i); // delete from JTable
enquiries.remove(rows[i] - i); // delete from ArrayList
}
}

// Sort the products in the ArrayList and then
// reload them into the JTable in the sorted order

public void sortEnquiries() {
Collections.sort(enquiries); // sorts into name order
loadEnquiriesIntoTable();
}

// Add a new products to the ArrayList and the JTable
public void addStockEnquiries() {
String [] row = new String [4];
StockEnquiries newEnquiry = new StockEnquiries(txtName.getText(), Integer.parseInt(txtPhone.getText()), txtBranch.getText());

enquiries.add(newEnquiry); // add to the ArrayList
row[0] = newEnquiry.getName();
row[1] = Integer.toString(newEnquiry.getPhone());
row[2] = newEnquiry.getBranch();
tabMod.addRow(row); // add to the JTable
}
public void loadInitialEnquiries() {
BufferedReader br = null;
try {
br = new BufferedReader(
new FileReader("stockEnquiryLog.txt"));

String s;
String name = "";
String phone = "";
String branch = "";
String enquiry ="";
String time = "";
int colCount = tab.getColumnCount();
String[] row = new String[colCount];

while ((s = br.readLine()) != null) {
if(s.equals("<stock_enquiry>")) {

row[0] = br.readLine(); // name
row[1] = br.readLine(); // phone
row[2] = br.readLine(); // branch
row[3] = br.readLine(); // time
row[4] = br.readLine(); // enquiry

time = br.readLine();


tabMod.addRow(row);
}
// Premature closing of InputStream by
// this misplaced line:
// br.close();
}
// Close the Reader after we are done with it.
br.close();
} catch(IOException e) {
System.out.println("loadInitialEnquiries i/o error: " +
e.getMessage());
}
}





public void loadEnquiriesIntoTable() {
tabMod.setRowCount(0);

String [] row = new String [3];
for (Iterator i = enquiries.iterator(); i.hasNext() {
StockEnquiries temp = (StockEnquiries) i.next();
row[0] = temp.getName();
row[1] = Integer.toString(temp.getPhone());
row[2] = temp.getBranch();
tabMod.addRow(row);
}
}


public static void main(String [] a) throws FileNotFoundException, IOException{
GUI1 me = new GUI1();
me.addWindowListener(new WindowAdapter() {
public void windowClosing(WindowEvent e) {
System.exit(0) ;
}
});
me.pack();
me.setVisible(true);
}
}

// i know i have to create a class to represent a thing called a TableModel,apart from this im clueless can someone help
thank you
sorry about the newbieness i posted this in someone elses thread

How to Use Tables (The Java™ Tutorials > Creating a GUI with JFC/Swing > Using Swing Components)

thank you for link but i have already tried this tutorial and looked at many more tutorials and forums, the SimpleTableDemo.java is not compiling NoClassDefFoundError: sorry for the newb questions i got big problems today:(

i tried using Jradiobutton instead but its not working

this is what i done
class RadioButtonRenderer implements TableCellRenderer {
public JRadioButton btn = new JRadioButton();

public Component getTableCellRendererComponent(JTable table, Object
value,boolean isSelected, boolean hasFocus, int row, int column) {
if (value==null) return null;

if(((Boolean)value).booleanValue())
btn.setSelected(true);
else
btn.setSelected(false);

if (isSelected) {
btn.setForeground(table.getSelectionForeground());
btn.setBackground(table.getSelectionBackground());
} else {
btn.setForeground(table.getForeground());
btn.setBackground(table.getBackground());
}
return btn;
}
}

class RadioButtonEditor extends DefaultCellEditor
implements ItemListener {
public JRadioButton btn = new JRadioButton();

public RadioButtonEditor(JCheckBox checkBox) {
super(checkBox);
}

public Component getTableCellEditorComponent(JTable table, Object
value, boolean isSelected, int row, int column) {

if (value==null) return null;
btn.addItemListener(this);
if ( ( (Boolean) value).booleanValue())
btn.setSelected(true);
else
btn.setSelected(false);

return btn;
}

public Object getCellEditorValue() {
if(btn.isSelected() == true)
return new Boolean(true);
else
return new Boolean(false);
}

public void itemStateChanged(ItemEvent e) {
super.fireEditingStopped();
}
}

:mad:
help please why isnt this compiling i am trying to add checkboxes to column [5].
import java.io.BufferedReader;
import java.io.FileNotFoundException;
import java.io.FileReader;
import java.io.IOException;
import java.util.*;
import javax.swing.*;
import javax.swing.table.*;
import java.awt.*;
import java.awt.event.*;

// This program allows a list of Products to be maintained i.e.
// added, deleted and sorted. The products are displayed in
// a JTable and also maintained in an ArrayList.

// Some criticisms of the code:

// 1. Quite a lot of the code seems concerned with keeping the
// JTable and the ArrayList contents in step. Perhaps there
// is a better way to do this by writing my own
// TableModel.

// 2. No data validation is implmented

// 3. The design does not conform to the MVC pattern

// 4. Only one sort order (by product name) is possible.
// To make it possible to sort into other orders e.g.
// by price it would be necessary to use a Comparator object.

// 5. The ArrayList used does not use generics

class StockEnquiries implements Comparable {
private String name;
private int phone;
private String branch;

public StockEnquiries(String n, int p, String b) {
name = n;
phone = p;
branch = b;
}
public StockEnquiries() {

}
public String getName() {
return name;
}
public int getPhone() {
return phone;
}
public String getBranch() {
return branch;
}
// compareTo() allows Product instances in a container
// (e.g. an ArrayList) to be sorted by Collections.sort().

// It can only sort things in one order (e.g. ascending order of
// name). Need to investigate the use of Comparator objects to
// allow different sort orders to be defined.

public int compareTo(Object o) {
StockEnquiries temp = (StockEnquiries) o;

// Strings already implement compareTo() so just use that
return (name.compareTo(temp.name));
}

}

public class GUI1 extends JFrame {

// A container for the Product instances
ArrayList enquiries = new ArrayList();

// GUI bits and bobs
JPanel panInput = new JPanel(new GridLayout(2,1)),
panAdd = new JPanel(),
panDelSort = new JPanel();

JTextField txtName = new JTextField(10),
txtPhone = new JTextField(5);
JTextField txtBranch = new JTextField(100);
JButton btnAdd = new JButton("Add"),
btnDelete = new JButton("Delete"),
btnSort = new JButton("Sort Products");
private class MyTableModel extends AbstractTableModel {

private Object[][] data;
private Object[] columns;

public MyTableModel(Object[][] data, Object[] columns) {
this.data = data;
this.columns = columns;
}
public Class getColumnClass(int columnIndex) {
return data[5][columnIndex].getClass();
}
public int getColumnCount() {
return columns.length;
}
public int getRowCount() {
return data.length;
}
public Object getValueAt(int rowIndex, int columnIndex) {
return data[rowIndex][columnIndex];
}
public boolean isCellEditable(int rowIndex, int columnIndex) {
return (columnIndex == 5);
}
private class CheckBoxCellEditor extends AbstractCellEditor implements TableCellEditor {
protected JCheckBox checkBox;

public CheckBoxCellEditor() {
checkBox = new JCheckBox();
checkBox.setHorizontalAlignment(SwingConstants.CEN TER);
checkBox.setBackground( Color.white);
}

public Component getTableCellEditorComponent(
JTable tab,
Object value,
boolean isSelected,
int row,
int column) {

checkBox.setSelected(((Boolean) value).booleanValue());

Component c = table.getDefaultRenderer(String.class).getTableCel lRendererComponent(table, value, isSelected, false, row, column);
if (c != null) {
checkBox.setBackground(c.getBackground());
}

return checkBox;
}
public Object getCellEditorValue() {
return Boolean.valueOf(checkBox.isSelected());


JTable tab = new JTable();

// The DefaultTableModel will allow the contents of the
// JTable to be manipulated.
myTableModel tabMod = new myTableModel();


public GUI1() {
super("stock enquiries list");
tab.setModel(tabMod);
tabMod.addColumn("Name");
tabMod.addColumn("Phone");
tabMod.addColumn("Branch");
tabMod.addColumn("time");
tabMod.addColumn("enquiry");
tabMod.addColumn("dealt with");



btnAdd.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent ae) {
addStockEnquiries();
}
});

btnDelete.setToolTipText("Select the records to delete first");
btnDelete.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent ae) {
deleteStockEnquiries();
}
});
btnSort.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent ae) {
sortEnquiries();
}
});

panAdd.add(btnAdd);
panAdd.add(new JLabel("Product name:"));
panAdd.add(txtName);
panAdd.add(new JLabel("Phone Number:"));
panAdd.add(txtPhone);
panDelSort.add(btnDelete);
panDelSort.add(btnSort);
panInput.add(panAdd);
panInput.add(panDelSort);
getContentPane().add(panInput, BorderLayout.SOUTH);
getContentPane().add(new JScrollPane(tab));
loadInitialEnquiries();
}
// Delete a product from the ArrayList and from the JTable
public void deleteStockEnquiries() {
int [] rows = tab.getSelectedRows();
for (int i = 0; i < rows.length; i++) {
tabMod.removeRow(rows[i] - i); // delete from JTable
enquiries.remove(rows[i] - i); // delete from ArrayList
}
}

// Sort the products in the ArrayList and then
// reload them into the JTable in the sorted order

public void sortEnquiries() {
Collections.sort(enquiries); // sorts into name order
loadEnquiriesIntoTable();
}

// Add a new products to the ArrayList and the JTable
public void addStockEnquiries() {
String [] row = new String [4];
StockEnquiries newEnquiry = new StockEnquiries(txtName.getText(), Integer.parseInt(txtPhone.getText()), txtBranch.getText());

enquiries.add(newEnquiry); // add to the ArrayList
row[0] = newEnquiry.getName();
row[1] = Integer.toString(newEnquiry.getPhone());
row[2] = newEnquiry.getBranch();
tabMod.addRow(row); // add to the JTable
}
public void loadInitialEnquiries() {
BufferedReader br = null;
try {
br = new BufferedReader(
new FileReader("stockEnquiryLog.txt"));

String s;
String name = "";
String phone = "";
String branch = "";
String enquiry ="";
String time = "";
int colCount = tab.getColumnCount();
String[] row = new String[colCount];

while ((s = br.readLine()) != null) {
if(s.equals("<stock_enquiry>")) {

row[0] = br.readLine(); // name
row[1] = br.readLine(); // phone
row[2] = br.readLine(); // branch
row[3] = br.readLine(); // time
row[4] = br.readLine(); // enquiry

time = br.readLine();


tabMod.addRow(row);
}
// Premature closing of InputStream by
// this misplaced line:
// br.close();
}
// Close the Reader after we are done with it.
br.close();
} catch(IOException e) {
System.out.println("loadInitialEnquiries i/o error: " +
e.getMessage());
}
}





public void loadEnquiriesIntoTable() {
tabMod.setRowCount(0);

String [] row = new String [3];
for (Iterator i = enquiries.iterator(); i.hasNext();) {
StockEnquiries temp = (StockEnquiries) i.next();
row[0] = temp.getName();
row[1] = Integer.toString(temp.getPhone());
row[2] = temp.getBranch();
tabMod.addRow(row);
}
}


public static void main(String [] a) throws FileNotFoundException, IOException{
GUI1 me = new GUI1();
me.addWindowListener(new WindowAdapter() {
public void windowClosing(WindowEvent e) {
System.exit(0) ;
}
});
me.pack();
me.setVisible(true);
}
}

Please post the complete nastygram that the compiler is spitting out at compile time.

CJSL

Some other recommendations that will help us help you:

• make your test of concept code a lot shorter. Just have it create the JTable, display it and try to see if you can get checkboxes working or not. It should compile on our boxes. Leave the other stuff non-essential to your problem out.
• when posting your code, please use code tags so that your code will retain its formatting and be readable. To do this, you will need to paste already formatted code into the forum, highlight this code, and then press the "code" button at the top of the forum Message editor prior to posting the message. Another way is to place the tag &#91;code] at the top of your block of code and the tag &#91;/code] at the bottom, like so:
  
  
  Code:

  ---

  [code]
  // your code block goes here.
  // note the differences between the tag at the top vs the bottom.
[/code]

  ---

iam getting compile error
invalid method declaration; return type required
public GUI1() {
expected }

im a genius got it to work :)
thank you for the help:P