Help:JCombobox in table cell

Question

I have a column using combobox as cell editor in jtable, the combo box 's content is different based on the row user selects, for example, user selects the first row, the combo box will show selections" hi, hello", when user selected the second row, that row's combobox will show "where, what, why". How can I create individual comboxeditor or renderer for each cell in combo box column, so the contents of combo box will change based on the different rows. My old way is just to create a editor for the whole column, but based on the selection, remove all items in the combobox, and add new items in that combo box. The problem is when user first click the combo, all items disappear,the second click will show all newly added items,how can I show just all new items just by one click.
Thanks a lot.

Answer 1

I have a code that con solve your problem... It shows the contents of a cell as jcombobox...
/*--- formatted by Jindent 2.1, (www.c-lab.de/~jindent) ---*/
import java.awt.*;
import javax.swing.*;
import javax.swing.table.*;
* Class declaration
* @author
* @version %I%, %G%
public class TableComboDemo extends JPanel {
     private JTable table;
     private int rows = 3;
     private int columns = 3;
     private int depth = 3;
     private String[][][] strings = new String[rows][columns][depth];
     private TableCellRenderer myRenderer = new MyComboRenderer();
     private TableCellEditor myEditor = new MyComboEditor();
     private TableModel myTableModel = new MyTableModel();
     * Constructor declaration
     * @see
     public TableComboDemo() {
          setupModel();
          table = new JTable() {
               * Method declaration
               * @param row
               * @param column
               * @return
               * @see
               public TableCellRenderer getCellRenderer(int row, int column) {
                    return myRenderer;
               public TableCellEditor getCellEditor(int row, int column) {
                    return myEditor;
          table.setModel(myTableModel);
          this.add(new JScrollPane(table));
     * Method declaration
     * @see
     public void setupModel() {
          strings[0][0][0] = "a";
          strings[0][0][1] = "b";
          strings[0][0][2] = "c";
          strings[0][1][0] = "d";
          strings[0][1][1] = "e";
          strings[0][1][2] = "f";
          strings[0][2][0] = "g";
          strings[0][2][1] = "h";
          strings[0][2][2] = "i";
          strings[1][0][0] = "j";
          strings[1][0][1] = "k";
          strings[1][0][2] = "l";
          strings[1][1][0] = "m";
          strings[1][1][1] = "n";
          strings[1][1][2] = "o";
          strings[1][2][0] = "p";
          strings[1][2][1] = "q";
          strings[1][2][2] = "r";
          strings[2][0][0] = "j";
          strings[2][0][1] = "s";
          strings[2][0][2] = "t";
          strings[2][1][0] = "u";
          strings[2][1][1] = "v";
          strings[2][1][2] = "w";
          strings[2][2][0] = "x";
          strings[2][2][1] = "y";
          strings[2][2][2] = "z";
     * Method declaration
     * @param args
     * @see
     public static void main(String[] args) {
          JFrame frame = new JFrame();
          frame.getContentPane().add(new TableComboDemo());
          frame.pack();
          frame.setVisible(true);
     * Class declaration
     * @author
     * @version %I%, %G%
     private class MyComboRenderer implements TableCellRenderer {
          private JComboBox combo;
          * Method declaration
          * @param table
          * @param value
          * @param isSelected
          * @param hasFocus
          * @param row
          * @param column
          * @return
          * @see
          public Component getTableCellRendererComponent(
               JTable table,
               Object value,
               boolean isSelected,
               boolean hasFocus,
               int row,
               int column) {
               combo = new JComboBox((String[]) value);
               return combo;
     * Class declaration
     * @author
     * @version %I%, %G%
     private class MyComboEditor extends DefaultCellEditor {
          private JComboBox combo;
          public MyComboEditor() {
               super(new JComboBox());
          * Method declaration
          * @param table
          * @param value
          * @param isSelected
          * @param row
          * @param column
          * @return
          * @see
          public Component getTableCellEditorComponent(
               JTable table,
               Object value,
               boolean isSelected,
               int row,
               int column) {
               combo = new JComboBox((String[]) value);
               return combo;
     * Class declaration
     * @author
     * @version %I%, %G%
     private class MyTableModel extends AbstractTableModel {
          * Method declaration
          * @return
          * @see
          public int getRowCount() {
               return rows;
          * Method declaration
          * @return
          * @see
          public int getColumnCount() {
               return columns;
          * Method declaration
          * @param row
          * @param column
          * @return
          * @see
          public Object getValueAt(int row, int column) {
               return strings[row][column];
          * Method declaration
          * @param row
          * @param col
          * @return
          * @see
          public boolean isCellEditable(int row, int col) {
               return true;
}