Adding A Column into a JTable

Hi
I have a JTable with two soccer teams in. What i want to do is to add in a column between them that just says "VS". I ahev to do this when the user clicks a button as the table is constructed from details stored in a MySQL database.
Can anyone give me any help?
Jason

the DefaultTableModel supports an addColumn() method, so:
a) create your table and TableModel
b) add a column to the end of the DefaultTableModel
Now the TableColumnModel controls the order in which the columns are painted, so
a) get the TableColumnModel from the table
b) move the colum to the center

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How can I add new row/column into existing jTable?

Hi add!
Can you help me how can I add new row/column into existing jTable?
Tnx in adv!

e.g
Create two buttons inside the Table ( "Add New Row" ) and ("Add new Column")
their handlers are:
add new row:
//i supose u already have
DefaultTabelModel tablemodel = new DefaultTableModel(rowdata, columnNames);
//and
   JTabel jtable = new JTable(tablemodel);
// Handler (row)
jbtAddRow.addActionListener(new ActionListener(){
   public void actionPerformed(ActionEvent e) {
      if(jtable.getSelectedRow() >= 0 )
          tablemodel.insertRow(jtable.getSelectedRow(), new java.util.Vector());
       else
            tablemodel.addRow(new java.util.Vector());
    });to add new columns its the same but inside actionPerformed method:
ask for e.g "Whats the name for the new column"
then,
   tablemodel.addColumn(nameOfColumn, new java.util.Vector());   Joao
Message was edited by:
Java__Estudante

How to insert rows & columns into a jTable???

helloo there...
How to insert rows & columns into a jtable???
your reply is greatly appreciated....
-=samer=-

Yes!thanks...
But what i want is how to set the number of rows and the number of columns...and i don't know how to setColumns and rows....any idea?
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Can I add a column into existing index?
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but there is no way to add a column to an existing table10:43:24 TEST.SQL>create table test10:43:28 2 (
10:43:29 3 a number
10:43:32 4 )
10:43:34 5 tablespace tools
10:43:36 6 ;
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Elapsed: 00:00:00.06
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Table altered.
Elapsed: 00:00:00.68
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Name Null? Type
A NUMBER
B DATE
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Table dropped.Indeed there is.Yoann.

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[email protected]

Adding a Column to a JTable

I have a simple gui where I query a database and return a result set in a JTable using a table model. I would like to be able to add a new column with checkboxes as the first column in the table. I've seen examples using checkboxes with boolen data from the database, but this column is not being returned from the database it is a new added column.
The first task is to add the column and I am struggling with this. My code is below.
import java.awt.BorderLayout;
import java.awt.GridLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.JTable;
public class DatabaseTest extends JFrame {
private QueryTableModel qtm;
public DatabaseTest()
    super("JTable Test");
    setDefaultCloseOperation(EXIT_ON_CLOSE);
    setSize(350, 200);
    qtm = new QueryTableModel();
    JTable table = new JTable(qtm);
    JScrollPane scrollpane = new JScrollPane(table);
    JPanel p1 = new JPanel();
    p1.setLayout(new GridLayout(3, 2));
    p1.add(new JLabel("Click here to Query the DB: "));
    JButton jb = new JButton("Search");
    jb.addActionListener(new ActionListener() {
      public void actionPerformed(ActionEvent e)
        qtm.Query();
    p1.add(jb);
    getContentPane().add(p1, BorderLayout.NORTH);
    getContentPane().add(scrollpane, BorderLayout.CENTER);
public static void main(String args[]) {
    DatabaseTest tt = new DatabaseTest();
    tt.setVisible(true);
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.ResultSetMetaData;
import java.sql.Statement;
import java.util.Vector;
import javax.swing.table.AbstractTableModel;
class QueryTableModel extends AbstractTableModel {
Vector cache;
private int colCount;
private String[] headers;
Statement statement;
private static Connection conn = null;
public QueryTableModel() {
    cache = new Vector();
public String getColumnName(int i) {
    return headers;
public int getColumnCount() {
return colCount;
public int getRowCount() {
return cache.size();
public Object getValueAt(int row, int col) {
return ((String[]) cache.elementAt(row))[col];
public void Query() {
cache = new Vector();
try {
Class.forName("oracle.jdbc.driver.OracleDriver");
conn=DriverManager.getConnection("jdbc:oracle:thin:@localhost:1521:*****","******","*******");
statement = conn.createStatement();
ResultSet rs = statement.executeQuery("Select username from dba_users where rownum < 6");
ResultSetMetaData meta = rs.getMetaData();
colCount = meta.getColumnCount();
// Now we must rebuild the headers array with the new column names
headers = new String[colCount];
for (int h = 1; h <= colCount; h++) {
headers[h - 1] = meta.getColumnName(h);
while (rs.next()) {
String[] record = new String[colCount];
for (int i = 0; i < colCount; i++) {
record[i] = rs.getString(i + 1);
cache.addElement(record);
fireTableChanged(null);
// Add column code here?
} catch (Exception e) {
cache = new Vector(); // blank it out and keep going.
e.printStackTrace();
}Not sure how to add the column. I've tried a few variations of the following code with no luck:TableColumn tc = new TableColumn(0, 120);
tc.setHeaerValue("Name");
table.getColumnModel().addColumn(tc);Any help would be appreciated.

The first task is to add the column Well, I like the suggestions from the link given in the above posting :-) It shows you how to dynamically alter the TableModel after its initial creation, and is probably the best generic solution.
But, just so you understand better how a TableModel works I"ll just put another thought in your mind. Maybe in this case you just create the TableModel correctly the first time so you don't need to do a dynamic change. The TableModel doesn't know where the data came from. It doesn't care that it came from a ResultSet. All it knows it that you have data in an array. So whats to prevent you from hard coding the first column to contain Boolean data?
{code}headers = new String[colCount+1];
headers[0] = "Boolean Column";
for (int h = 1; h <= colCount; h++)
headers[h] = meta.getColumnName(h);
while (rs.next())
String[] record = new String[colCount+1];
record[0] = new Boolean.FALSE;
for (int i = 1; i <= colCount; i++)
record[i] = rs.getString(i);
}{code}

Dynamically adding a column to a jtable - simple & urgent

I am new to using JTables.
I have read the tutorial and looked at several examples, but I am still confused as to how to add/remove columns and how to add rows to the table.
I want to have a totally dynamic table which will allow me to add/remove columns and to add rows.
The table gets the data to be displayed (and the column header values) from an outside object. I thought about writing my own table model.
Here is the code for my simple table model:
import javax.swing.table.*;
import java.util.Vector;
public class MyTableModel extends AbstractTableModel{
   private Vector columnHeaders;
   private Vector data;
   // simple constructor
   public MyTableModel() {
      columnHeaders = new Vector();
      data = new Vector(); // data is a vector of vectors
   public int getColumnCount() {
      return columnHeaders.size();
   public int getRowCount() {
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          return 0;
      Vector columnData = (Vector)data.elementAt(0);
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   public Object getValueAt(int row, int column) {
      Vector columnData = (Vector)data.elementAt(column);
      return columnData.elementAt(row);
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   public void addNewEmptyColumn(String value) {
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       fireTableStructureChanged();
}Here is how I use the table model with my table
import javax.swing.*;
public class Demo extends JFrame{
    private JTable table;
    public Demo() {
        super("test");
        table = new JTable(new MyTableModel());
        getContentPane().add(table);
        pack();
        show();
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}I try to add columns, but nothing happens!!!
What am I doing wrong?
I would appreciate if someone who take himself/herslef to be a JTable expert could give me his/her e-mail and this way I won't bother the rest of the world with my stupid JTable questions...
Sincerely
Nir

I have another question.
What if I want to render the table headers in a certain way.
I would like to use:
TableColumn's setHeaderRenderer(TableCellRenderer headerRenderer).
But in order to do it, I need to get a TableColumn.
How do I get it from the model?
I thought about subclassing JTable and overriding:
public void tableChanged(TableModelEvent e)that function is called everytime I invoke fireTableStructureChanged().
In that function, I am assuming that a column has been added, however, when I query for JTable's getColumnCount(), I keep getting 0!

Adding description column into wizard generated matrix report

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for example i have a job called abc and it has envelopes(e1,e2), base stationary (s1,s2) and inserts (i1,i2).
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abc e1 s1 i1
e2 s2 i2
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any ideas? i have tried adding in an additional field, however, i get some type of grouping error (my reports has just crashed so i can't get exact error)
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Hi,
If I understood you right. Place the txt next to the insert field, then right click on the txt field and go to 'Conditional Formatting' then New. Put it in, if the value of Insert column is null, then click the 'Hide the Object' checkbox.
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How can i add a new column every time a button is pressed? I have
String columns[][] = {{"1", "2", "3"}}But i don't know how to add a new {} row...
Help?
Or can someone show me a better way to do it?

Use a Collection instead of arrays.
Arrays are fixed-size. If you need a bigger array, you need to create the new one, copy the old content over and fill in the new values.
Collections hide all that complexity from you by providing simple .add() and .remove() methods.
Arrays: low-level mechanism.
Collections: more comfortable high-level mechanism

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Hallo ladies and gentlemen,
how can i easily add an mark column to an alv-list?
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hi,
DATA : wf_slis TYPE slis_t_fieldcat_alv.
PERFORM build_catalog USING wf_slis[].
FORM build_catalog USING wf_slis TYPE slis_t_fieldcat_alv.
.ur old fields....
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CLEAR wf_str_slis.
wf_str_slis-fieldname = 'WF_MARK'.
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   EXPORTING
I_INTERFACE_CHECK              = ' '
I_BYPASSING_BUFFER             =
I_BUFFER_ACTIVE                = ' '
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I_CALLBACK_PF_STATUS_SET       = ' '
I_CALLBACK_USER_COMMAND        = ' '
I_STRUCTURE_NAME               =
IS_LAYOUT                      =
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IT_EXCLUDING                   =
IT_SPECIAL_GROUPS              =
IT_SORT                        =
IT_FILTER                      =
IS_SEL_HIDE                    =
I_DEFAULT                      = 'X'
I_SAVE                         = ' '
IS_VARIANT                     =
IT_EVENTS                      =
IT_EVENT_EXIT                  =
IS_PRINT                       =
IS_REPREP_ID                   =
I_SCREEN_START_COLUMN          = 0
I_SCREEN_START_LINE            = 0
I_SCREEN_END_COLUMN            = 0
I_SCREEN_END_LINE              = 0
IR_SALV_LIST_ADAPTER           =
IT_EXCEPT_QINFO                =
I_SUPPRESS_EMPTY_DATA          = ABAP_FALSE
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E_EXIT_CAUSED_BY_CALLER        =
ES_EXIT_CAUSED_BY_USER         =
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      t_outtab                       = int_zone[]
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     program_error                  = 1
     OTHERS                         = 2
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ENDIF.
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anver
Message was edited by: Anversha s

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Hello everyone,
i was looking for a way to add/remove columns from a jtable. The way i envision it working is... Initially have a predefined number of columns, of these only show the user say 5 of those on startup. but then provide a drop down (or list box etc) of the other column headings, so that when the user selects one... it adds it to the jtable. also to remove ..... is there a way to have a pop-up when the user right-clicks the table header and put a option to remove that column there? if not what is the best way to trigger a remove of a column? So i need a way to keep track of all the columns in case the user wants to add it again. anyone know how this can be done or any part of it?

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Adding A Column into a JTable

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