JButtons into a JTable

Is it possible for me to get a JButton into and JTable? The Table contents come from the code below.
server myserver= new server();//make object of this class
network mynetwork= new network(myserver);// make network objectand pass server as refrence
int row,col;
          //initialise string database for hosts
          for (row=0;row<50;row++){
               myserver.hostdb[row][0]=""+iconButtons;
               for (col=1;col<8;col++){
               myserver.hostdb[row][col]="";
Any help would be appriciated thanks.

Yes
http://java.sun.com/docs/books/tutorial/uiswing/components/table.html#editrender

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Adding JButton into JTable cells

Hi there!!
I want to add a JButton into JTable cells.In fact I have got two classes.Class2 has been extended from the AbstractTableModel class and Class1 which is using Class2's model,,,here's the code,,
Class1
import javax.swing.JScrollPane;
import javax.swing.JTable;
public class Class1 extends javax.swing.JFrame {
   //////GUI specifications
    public static void main(String args[]) {
        java.awt.EventQueue.invokeLater(new Runnable() {
            public void run() {
                new TestTableButton().setVisible(true);
        Class2 model=new Class2();
        jTable1=new JTable(model);
        jScrollPane1.setViewportView(jTable1);
    // Variables declaration - do not modify
    private javax.swing.JScrollPane jScrollPane1;
    // End of variables declaration
    private javax.swing.JTable jTable1;
}Class2
import javax.swing.table.*;
public class Class2 extends AbstractTableModel{
    private String[] columnNames = {"A","B","C"};
    private Object[][] data = {
    public int getColumnCount() {
        return columnNames.length;
    public int getRowCount() {
        return data.length;
    public String getColumnName(int col) {
        return columnNames[col];
    public Object getValueAt(int row, int col) {
        return data[row][col];
    public Class getColumnClass(int c) {
        return getValueAt(0, c).getClass();
     * Don't need to implement this method unless your table's
     * editable.
    public boolean isCellEditable(int row, int col) {
        //Note that the data/cell address is constant,
        //no matter where the cell appears onscreen.
            return false;
     * Don't need to implement this method unless your table's
     * data can change.
    public void setValueAt(Object value, int row, int col) {
        data[row][col] = value;
        fireTableCellUpdated(row, col);
}what modifications shud I be making to the Class2 calss to add buttons to it?
Can anybody help plz,,,,,??
Thanks in advance..

Hi rebol!
I did search out a lot for this but I found my problem was a bit different,,in fact I want to use another class's model into a class being extended by JFrame,,so was a bit confused,,,hope you can give me some ideas about how to handle that scenario,,I know this topic has been discussed before here many a times and also have visited this link,,
http://forum.java.sun.com/thread.jspa?threadID=465286&messageID=2147913
but am not able to map it to my need,,,hope you can help me a bit...
Thanks .....

Changing the size of a jbutton inside a jtable

Hi,
I have found this example for adding a jbutton to a jtable:
http://forum.java.sun.com/thread.jspa?forumID=57&threadID=715330
however, I have cannot seem to figure out how to set the size of the jbutton. Currently, the jbutton is filled to the size of the cell within the jtable, but i want to have it a bit smaller and centered (the rows of my table are rather large in hieght)
I tried the setSize()
setPrefferedSize()
setMinimumSize()
setMaximumSize()methods, but nothing seems to work. Has anyone been able to do this?

Use a JPanel instead of a JButton as cell renderer. Put a button inside the panel - use FlowLayout.

How to use JButton as a JTable column header?

I'd like to use JButtons as my JTable's column headers.
I built a JButton subclass which implemented TableCellRenderer and passed it to one of my table column's setHeaderRender method. The resulting header is a component that looks like a JButton but when clicked, it does not visually depress or fire any ActionEvents.

You might want to check this example and use it accordingly for your requirements.
http://www2.gol.com/users/tame/swing/examples/JTableExamples5.html
Reason: The reason you're unable to perform actions on JButton is JTableHeader doesn't relay the mouse events to your JButtons.
I hope this helps.
have fun, ganesh.

How to include a jButton in the jTable CellEditor?

sir,
how can include a jButton in the jTable cell Editor as we include checkbox & Combo inthe Cell Editor?
thks.

There is c:import tag in the JSTL that will include the HTML from a file on another server.

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

Loading the Contents of a file into a JTable

I am trying to load the content of a delimited (tab, comma, etc), into a JTable. The code is very simple and works for the most part. Here is some of it:
               List tableRows = new ArrayList();
               String lineItem = "";
               InputStream in = new FileInputStream(fName);
               InputStreamReader isr = new InputStreamReader(in);
          BufferedReader br = new BufferedReader(isr);
     while((lineItem = br.readLine()) != null)
                    if(x == MAX)
                         break;
                    java.util.List rowData = new ArrayList();
                    StringTokenizer st = new StringTokenizer(lineItem, "\t");
                    while(st.hasMoreElements())
                         rowData.add(st.nextToken());
                    tableRows.add(rowData);
                    x++;
Basically, tableRows, ends up to be a List of Lists which I later use to populate the Object[][] for the JTable rows. This works perfect!
My problem has to do with the tokenizer. In some situations, values in a line that is read contains "". For example an line read (quotes are showed only to distinquish values in the line):
"item1", "item2", " ", "item4", " ", "item6", "item7"
The tokenizer does not capture the " ". So instead of 7 tokens, it only sees 5.
My question is, can someone tell me a better approach for tokenizing the string so that it captures everything?
Thanks in advance,
Augustine

I am trying to load the content of a delimited (tab, comma, etc), into a JTable. The code is very simple and works for the most part. Here is some of it:
               List tableRows = new ArrayList();
               String lineItem = "";
               InputStream in = new FileInputStream(fName);
               InputStreamReader isr = new InputStreamReader(in);
          BufferedReader br = new BufferedReader(isr);
     while((lineItem = br.readLine()) != null)
                    if(x == MAX)
                         break;
                    java.util.List rowData = new ArrayList();
                    StringTokenizer st = new StringTokenizer(lineItem, "\t");
                    while(st.hasMoreElements())
                         rowData.add(st.nextToken());
                    tableRows.add(rowData);
                    x++;
Basically, tableRows, ends up to be a List of Lists which I later use to populate the Object[][] for the JTable rows. This works perfect!
My problem has to do with the tokenizer. In some situations, values in a line that is read contains "". For example an line read (quotes are showed only to distinquish values in the line):
"item1", "item2", " ", "item4", " ", "item6", "item7"
The tokenizer does not capture the " ". So instead of 7 tokens, it only sees 5.
My question is, can someone tell me a better approach for tokenizing the string so that it captures everything?
Thanks in advance,
Augustine

Disable JTable draggable? // reimporting into a JTable?

How do I disable the ability to drag and drop the colons of a JTable?
I am making a database where I am importing from a file (to view, but not edit it). How can I reimport the file after I have imported it into the JTable?
This is my code at the moment.
    public void reload()
        ArrayList<String> ve = new ArrayList<String>(9); // imports the file into an ArrayList of lines
        try
            BufferedReader reader = new BufferedReader(new FileReader(source));
            String line = null;
            while ((line = reader.readLine()) != null)
                ve.add(line);
            reader.close();
        catch (IOException e)
            System.out.println("Error reading file.");
        ve.trimToSize();
        String [][] data = new String[ve.size()/9][];
        for(int i = 0; i < data.length; i++)
            data[i] = new String[9];
            String name = ve.get(9*i);
            data[0] = name;
String mobile = ve.get(9*i+1);
data[i][1] = mobile;
String dest = ve.get(9*i+2);
data[i][2] = dest;
String tranOut = ve.get(9*i+3);
data[i][3] = tranOut;
String tranIn = ve.get(9*i+4);
data[i][4] = tranIn;
String adult = ve.get(9*i+5);
data[i][5] = adult;
String number = ve.get(9*i+6);
data[i][6] = number;
String dep = ve.get(9*i+7);
data[i][7] = dep;
String arr = ve.get(9*i+8);
data[i][8] = arr;
sort(data); // run quickSort
table = new JTable(data, columnNames);
scrollPane = new JScrollPane(table);
}It works the first time it is run, but not when I try to call it later (from the menus).

In future, Swing questions should be asked in the [Swing Forum.|http://forums.sun.com/forum.jspa?forumID=57]
The header row of a JTable is really an instance of JTableHeader . Take a look at the API and see if there are any methods that would be of use. (Hint: there are!)

Inserting values from sql into a JTable

Good day all,
Please I need someone's assistance as regard inserting data retrieved from JavaDB into a JTable I created in NetBeanns6.5.
I have to click on a ViewData Button in order to display data in the JTable below.
Please I need a simple example to demostrate it.
Also, how can I resize the column of my JTable so that I can see fully what is retrieved from the database, cos I have one that retrieves but the column is not wide enuogh to accommodate the data.(I did this outside NetBeans)
Thanks
Alam Ikenna Winner.

First, learn to use PreparedStatements. Then we can talk further.

Moving a ResultSet into a JTable, cheaply and efficiently.

Hi,
This may be something interesting for the more advanced Java programmers.
I've recently run into an issue, with moving a ResultSet into a JTable. Now, this may seem simple, and believe me it is, but, all the ways I have seen it done, and tried, just don't suite my need.
DBSql dbsql = new DBSql(); // My database handler class
tableResults.setModel(new javax.swing.table.DefaultTableModel(dbsql.execute(script), dbsql.getColumns()));
* Queries the DataBase and populates
* the values into a two-dimensional object array
* @param SqlQry
* @return Object[][]
public Object[][] execute(String SqlQry) throws SQLException {
Object[][] obj = null;
select = connection.createStatement(ResultSet.TYPE_SCROLL_SENSITIVE,
ResultSet.CONCUR_READ_ONLY);
ResultSet rs = select.executeQuery(SqlQry);
rsmd = rs.getMetaData();
try {
if (rs.next()) {
boolean found = true;
rs.last();
recordCount = rs.getRow();
rs.first();
obj = new Object[recordCount][rsmd.getColumnCount()];
int i = 0;
while (found) {
for (int j = 0; j < rsmd.getColumnCount(); j++) {
obj[i][j] = rsmd.getColumnType(j + 1) != Constants.TYPE_INTEGER ? rs.getString(j + 1) : rs.getInt(j + 1);
i++;
found = rs.next();
} else {
recordCount = 0;
return null;
} catch(OutOfMemoryError oome) {
System.gc();
throw new SQLException("Out Of Memory");
if(rs != null) rs.close();
return obj;
The application I have created is used to connect to any database I want. I have tested it with JavaDB, Microsoft Access, and DB2. The problem is, most DB2's have tables with many records and columns, while most new Relational Databases, have small tables with few records. This code works fantastic with a couple thousand records, with very few columns. But, doesn't cut it when it comes to 50000 records or more. For, instance I queried a DB2 table that has 34000 records and 117 columns ("select * from table"), it doesn't take too long, but it uses way too much memory. If I run that query the application resources 298mb, then when I run it again, it uses a little more and throws an OutOfMemoryError.
The second issue I have is, I queried another table that has 147000 records and selected 4 columns. No OutOfMemoryError this time - 70mb resourcing - but, the application did take at least 20 minutes to collect those records.
I have tried using the Vector<Vector<String>> type into the JTable, but, frankly that's just asking for an OutOfMemoryError.
I have tried creating my own custom table model, with a created data object.
I have tried inserting rows into a table model in the method itself and returning the table model.
Eg.
while (found) {
Object[] obj = new Object[rsmd.getColumnCount()];
for (int j = 0; j < rsmd.getColumnCount(); j++) {
obj[j] = rsmd.getColumnType(j + 1) != Constants.TYPE_INTEGER ? rs.getString(j + 1) : rs.getInt(j + 1);
tablemodel.insertRow(obj);
found = rs.next();
^I think you can use a vector for this too.
So far, nothing has solved my problem.
One thing I have not tried however, is a different table component for this kind of thing.
I'm basically looking for, a method of doing this, with less overhead and quicker table population.
Any Ideas?
Regards,
That_Gui

Thanks for the reply.
"1) Swing related questions should be posted in the Swing forum."
Apologies, I was caught between swing and essentials, as it seemed to me as, more of a "better ways to do things" kind of question.
"Also, the approach you are using requires two copies of the data, one in the ResultSet and one in the TableModel."
I understand that transferring a ResultSet into an Object Array may probably be resource intensive, my delphi colleague made mention of that to me, not too long ago. That is why I'm trying to transfer the ResultSet directly into the table. That is why I used the ListTableModel, which also uses a lot of memory, I have looked at that - I had forgotten to mention that.
"I have seen approaches where you try to only read a specific number of records. Then as you scroll additional records are read as needed. I can't point you to any specific solution though."
Using an approach of reading the data as you scroll, sounds great, but also sounds like unnecessary work for the program to do, just like this Object/Vector story. In RPG, if you are working with subfiles (like a JTable), you will display 10 records at a time, and if the user hits the Page Down button you will display the next 10, that is how I'm understanding it.
"I rarely use DefaultTableModel, creating your own model from AbstractTableModel is a lot more flexible when it comes to how you organise your storage, and it's pretty simple once you get the hang of it."
This is the dream, I just need to design one that works as I need it.
"You'd do a select count(*) on your query first to get the total rows expected. Of course one of the problems is that the databased table may change after you've retrieved the length or the items."
Unfortunately, this is not an option for me, it wont work for what I need.
I'm going to give the ResultSetTableModel a go - which I think it is actually similar to the ListTableModel - and I will get back to you.

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?
the user will input number of rows and columns in a jtextfield....
Please rply...

Enable Dropping into Empty JTables

Hi there!
I've just posted another blog on Swing Drag and Drop. Learn how to enable dropping into empty JTables with a single method call in Mustang, or a simple override in earlier versions of J2SE.
http://weblogs.java.net/blog/shan_man/archive/2006/01/enable_dropping.html
All the best,
Shannon Hickey (Swing Team)

Hi,
It looks like below bug in SQLDeveloper.
Bug 6326721: Updatable views - could not insert, update and delete as for tables.
Please close the thread, if I answered your question.
Regards,
Satishbabu Gunukula
http://oracleracexpert.blogspot.com

Pass a xml file into a JTable

I'm new to java and xml, I need to pass a xml file into a JTable.
thanks

That error about the package not existing probably means that your classpath is wrong. Is JDOM in a Jar file? If so, add it to the classpath on the command line:
javac -classpath C:\JDOMPath\JDOM.jar;C:\MyClasses DescendantDemo.java(put whatever directories and jar files you need in the classpath).

How can I add a row into a JTable with JButton

Hi all. I have the following code:
package gui;
import db.*;
import javax.swing.table.AbstractTableModel;
import java.util.ArrayList;
public class FoundersTable extends AbstractTableModel{
    private static final int COLUMNS = 8;
    private String columnNames[] = {"�� ", "��", "��", "��", "��", "��",
            "�� ", "�� , ��"};
    private ArrayList data;
    public FoundersTable(){
        data = new ArrayList();
    public int getRowCount() {
        return data.size();
    public int getColumnCount() {
        return columnNames.length;
    public String getColumnName(int colIndex) {
        return columnNames[colIndex];
    public Object getValueAt(int rowIndex, int columnIndex) {
        return ((ArrayList)data.get(rowIndex)).get(columnIndex);
    public void setValueAt(Object value, int rowIndex, int columnIndex) {
        ((ArrayList)data.get(rowIndex)).set(columnIndex, value);
        fireTableCellUpdated(rowIndex, columnIndex);
    public void addRow(ArrayList neueZeile) {
        data.add(neueZeile);
        int index = data.size() - 1;
        fireTableRowsInserted(index, index);
    public void removeRow(int index) {
        data.remove(index);
        fireTableRowsDeleted(index, index);
    public void removeAllRows() {
        data.clear();
        fireTableRowsDeleted(0, 0);
    public boolean isCellEditable(int rowIndex, int columnIndex) {
        return true;
}Now in my MainJFrame class I have one button for additing and one button for removing a selected row. How can I add/remove rows with this two buttons.
Thanks

No my question is how can I add and remove rows WITH buttons My point was the code is the same. You use the addRow(...) method. Why did you write an addRow(...) method if you aren't going to use it?
I don't understand your problem. Do you not know how to write an ActionListener?

Using JButtons in a JTable

I'm trying to find some information about how to use a JButton within a cell of a JTable. I'm able to insert the button using a custom cell renderer. Basically I create my own renderer which is triggered for JButton.class. That works well.
Of course I do a addActionListener() on the JButton so something will happen when it is pressed.
But the problem is that events aren't getting through to the button at all. The table is getting all the mouse events and is not passing them on.
I'm sure I'm not the first to run into this. Any suggestions on how to get the events to the button, or otherwise deal with this problem?
Thanks

Those example are from 1998. I don't think they work anymore.
Basically, if I could just find a way to get the JTable to send any kind of event to any class that I can write, I would be happy. That would do the trick.
One possibility is to just use a mouse listener, although that seems like a very low-level way to do something which should be at a higher level. But that seems like the only way. Try as I might, I can't find a way to set an editor for these cells.
I used table.setDefaultEditor(JButton.class, myTableCellEditor), and I tried to set it on the column, too, but myTableCellEditor never gets called in response to events.
Any other approaches?
Thanks

JButtons into a JTable

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