Ok,
I read other posts on the same topic, but i didn't get what i exactly wanted..
1- i want to add JCheckboxes in one of the JTable columns
2- i want to handle events for it.. e.g adding new row when checkbox is clicked etc
I referred the java docs, while adding the Boolean to a column makes checkboxes appear in the column, but they don't work!(they don't change state marked/unmarked) Also tried creating own TableModel extending AbstractTableModel and adding CellRenderer but then the checkboxes disappear and a string true/false is displayed in it.. There's something i'm missing out, can someone give me a direction..please

Have a look at
http://download.oracle.com/javase/tutorial/uiswing/components/table.html#renderer
in particular the section "Using Other Editors" that starts quite near the bottom...

Thank you very much..that helped

It worked fine with arrays..
Now, I'm trying to use a vector instead of an array, so I can add rows at run-time..
But the checkbox and combobox don't work now. Here's the code.. Something wrong? please tell me

import java.awt.Component;
import java.awt.Dimension;
import java.util.Iterator;
import java.util.Vector;

import javax.swing.DefaultCellEditor;
import javax.swing.JComboBox;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.JTable;
import javax.swing.table.AbstractTableModel;
import javax.swing.table.DefaultTableCellRenderer;
import javax.swing.table.TableCellRenderer;
import javax.swing.table.TableColumn;


public class TableDemo extends JPanel {

	public TableDemo(){
		MyTableModel tableModel = new MyTableModel();
		
		JTable table = new JTable(tableModel);
		table.setPreferredScrollableViewportSize(new Dimension(500, 100));
		table.setFillsViewportHeight(true);
		
		tableModel.addRow(0, new Object[]{"", new Boolean(false),"Kim","Option 1"});
		
		 //Set up column sizes.
        initColumnSizes(table);
		
		//Setting cell renderer and editor
		TableColumn selectColumn = table.getColumnModel().getColumn(3);
		
		JComboBox options = new JComboBox();
		options.addItem("Option 1");
		options.addItem("Option 2");
		
		selectColumn.setCellEditor(new DefaultCellEditor(options));
		DefaultTableCellRenderer renderer = new DefaultTableCellRenderer();
		renderer.setToolTipText("Click for Combobox");
		
		JScrollPane scrollPane = new JScrollPane(table);
		add(scrollPane);
	}
    private void initColumnSizes(JTable table) {
        MyTableModel model = (MyTableModel)table.getModel();
        TableColumn column = null;
        Component comp = null;
        int headerWidth = 0;
        int cellWidth = 0;
        Object[] longValues = model.longValues;
        TableCellRenderer headerRenderer =
            table.getTableHeader().getDefaultRenderer();

        for (int i = 0; i < 4; i++) {
            column = table.getColumnModel().getColumn(i);

            comp = headerRenderer.getTableCellRendererComponent(
                                 null, column.getHeaderValue(),
                                 false, false, 0, 0);
            headerWidth = comp.getPreferredSize().width;

            comp = table.getDefaultRenderer(model.getColumnClass(i)).
                             getTableCellRendererComponent(
                                 table, longValues[i],
                                 false, false, 0, i);
            cellWidth = comp.getPreferredSize().width;

            column.setPreferredWidth(Math.max(headerWidth, cellWidth));
        }
    }
	class MyTableModel extends AbstractTableModel{

		String columnNames[] = {"","Check","Name","Select"};
		Vector<Object[]> data = new Vector<Object[]>();
		public final Object[] longValues = {"",new Boolean(false),"","Option 2"};

		@Override
		public int getRowCount() {
			System.out.println("getRowCount");

			Iterator<Object[]> iter = data.iterator();
			int rowCount = 0;
			while(iter.hasNext())
			{
				iter.next();
				rowCount++;
			}
			return rowCount;
		}

		@Override
		public int getColumnCount() {
			return columnNames.length;
		}

		@Override
		public Object getValueAt(int rowIndex, int columnIndex) {
			Object value = null;
			Object currRow[] = null;
			int currRowIndex = 0;
			Iterator<Object[]> iter = data.iterator();
			
			while(iter.hasNext())
			{
				currRowIndex++;
				currRow = iter.next();
				if(currRowIndex == rowIndex)
				{
					value = currRow[columnIndex];
				}
			}
			return value;
		}

		@Override
		public void setValueAt(Object aValue, int rowIndex, int columnIndex) {
			Object currRow[] = null;
			int currRowIndex = 0;
			Iterator<Object[]> iter = data.iterator();
			
			while(iter.hasNext())
			{
				currRowIndex++;
				currRow = iter.next();
				if(currRowIndex == rowIndex)
				{
					currRow[columnIndex] = aValue;
					addRow(currRowIndex, currRow);
				}
			}
		}
		
		public void addRow(int rowIndex, Object values[]){//, int rowIndex, int columnIndex){
			data.add(rowIndex,values);
		}

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

		@Override
		public Class getColumnClass(int columnIndex) {
			return getValueAt(1, columnIndex).getClass();
		}

		@Override
		public boolean isCellEditable(int rowIndex, int columnIndex) {

			if(columnIndex==0)
				return false;
			else
				return true;
		}
	}
   private static void createAndShowGUI() {
	        //Create and set up the window.
	        JFrame frame = new JFrame("TableRenderDemo");
	        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

	        //Create and set up the content pane.
	        TableDemo newContentPane = new TableDemo();
	        newContentPane.setOpaque(true); //content panes must be opaque
	        frame.setContentPane(newContentPane);

	        //Display the window.
	        frame.pack();
	        frame.setVisible(true);
	    }
	public static void main(String[] args) {
        javax.swing.SwingUtilities.invokeLater(new Runnable() {
            public void run() {
                createAndShowGUI();
            }
        });
	}
}

remove AbstactTableModel, start with DefaultTableModel and set Class for TableColumn corectly

with class I meaning somthing like as ....

@Override
    public Class<?> getColumnClass(int colNum) {
        switch (colNum) {
            case 0:
                return Integer.class;
            case 1:
                return Date.class;
            case 2:
                return Date.class;
            case 3:
                return Integer.class;
            case 4:
                return Double.class;
            case 5:
                return Double.class;
            case 6:
                return Double.class;
            case 7:
                return Double.class;
            case 8:
                return Double.class;
            default:
                return String.class;
        }
    }

but anyway you can search for TableCellRenderer and TableCellEditor, there are everything

http://download.oracle.com/javase/tutorial/uiswing/components/table.html

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