swing - Java JTable Problems -

i've scoured internet looking bits , pieces of solution problem, haven't seemed come yet, , i've been struggling solve this.

in short, need create jdialog embeds jtable. jtable has dynamic in regards amount of columns. also, i'd first 2 rows of jtable have combo boxes in each of cells. row 1 has same combo box, , row 2 has same combo box, different row one. there, i'm filling in static text data set number of other rows. table should of form:

combo, combo, combo, combo, ...
combo, combo, combo, combo, ...
text, text, text, text, ...

i'm having lot of trouble a) making column number dynamic (it depend on array passed) , b) making first 2 rows combo boxes - way can find anywhere makes entire column combo boxes.

if helps @ all, i'm using netbeans ide. thank in advance time, , if further knowledge needed, let me know.

how can return tablecelleditor returning jcombobox?

import java.awt.*; import java.awt.event.*; import java.util.list; import java.util.arraylist; import javax.swing.*; import javax.swing.border.*; import javax.swing.table.*;  public class tablecomboboxbyrow extends jframe {     list<tablecelleditor> editors = new arraylist<tablecelleditor>(3);      public tablecomboboxbyrow()     {         // create editors used each row          string[] items1 = { "red", "blue", "green" };         jcombobox combobox1 = new jcombobox( items1 );         defaultcelleditor dce1 = new defaultcelleditor( combobox1 );         editors.add( dce1 );          string[] items2 = { "circle", "square", "triangle" };         jcombobox combobox2 = new jcombobox( items2 );         defaultcelleditor dce2 = new defaultcelleditor( combobox2 );         editors.add( dce2 );          string[] items3 = { "apple", "orange", "banana" };         jcombobox combobox3 = new jcombobox( items3 );         defaultcelleditor dce3 = new defaultcelleditor( combobox3 );         editors.add( dce3 );          //  create table default data          object[][] data =         {             {"color", "red"},             {"shape", "square"},             {"fruit", "banana"},             {"plain", "text"}         };         string[] columnnames = {"type","value"};         defaulttablemodel model = new defaulttablemodel(data, columnnames);         jtable table = new jtable(model)         {             //  determine editor used row             public tablecelleditor getcelleditor(int row, int column)             {                 int modelcolumn = convertcolumnindextomodel( column );                  if (modelcolumn == 1 && row < 3)                     return editors.get(row);                 else                     return super.getcelleditor(row, column);             }         };          jscrollpane scrollpane = new jscrollpane( table );         getcontentpane().add( scrollpane );     }      public static void main(string[] args)     {         tablecomboboxbyrow frame = new tablecomboboxbyrow();         frame.setdefaultcloseoperation( exit_on_close );         frame.pack();         frame.setvisible(true);     } }