JTable - disable cell editing for whole table
I need to know how to disable cell editing for the whole of a JTable. Is there an easy way of doing this??
you can do it very easy :)
just override AbstractTableModel's isCellEditable(int row, int col) function
and return false is ok.
Hope this helps!
Similar Messages
-
IsCellEditable() to disable cell editing for specific columns
Hello experts:
My SSCCE for this question is at the below link:
http://forum.java.sun.com/thread.jspa?threadID=5293914&messageID=10244030#10244030
My question is how do I disable cell editing for all but the "Price" column of my table in the SSCCE. I tried adding the below lines of code right after creating the JTable. But get compilation errors.
//Here is the block of code that I am trying to include.
@Override
public boolean isCellEditable(int row, int col) {
if (col == 7) {
return true;
} else {
return false;
} //Below is the method in detail03.java showing the block of code added
private JScrollPane BuildEmptyTable() {
model = new DefaultTableModel();
model.addTableModelListener( this );
model.setColumnIdentifiers(new String[] { "SKU","Qty", "Price"});
tblDetailTest = new JTable(model);
@Override
public boolean isCellEditable(int row, int col) { // <----- I tried placing the
if (col == 7) { // the code block here
return true;
} else {
return false;
tblDetailTest.setRowHeight(20);
tblDetailTest.setPreferredScrollableViewportSize(new Dimension(900, 100));
JTableHeader tblHdr = tblDetailTest.getTableHeader();
tblHdr.setBackground(Color.yellow);
JScrollPane scrollPane = new JScrollPane(tblDetailTest);
return scrollPane;
}Can somebody please guide me? Thank you very much.oops!
Sorry, my bad! I did not tell you what I tried. Following your suggestion, I made the following 2 changes to the code:
In the method, BuildEmptyTable(), where I build the table structure, I have the following statement:
tblDetail = new JTable(model){
public boolean isCellEditable(int row, int col) {
return col == 8;
};And in a separate method after the table is populated with data, I have the below code:
tblDetail.getModel().addTableModelListener(new TableModelListener() {
public void tableChanged(TableModelEvent e) {
if (e.getType() == TableModelEvent.UPDATE)
int row = e.getFirstRow();
int column = e.getColumn();
if (column == 8){
//code here
System.out.println("Updating item price!");
}I do understand that the message gets displayed as many number of times equal to number of rows inserted into the table, because of the UPDATE event. But my problem is I do not know how to make a code change to do what I exactly want, as I have indicated in my previous note. Meaning I want the listener to be called only when the
data in the editable cell changes.
Thank You. -
Need help serializing an AbstractTableModel for a JTable with cell editing.
Fun times are ahead. Here we go!
I have a JTable that contains data I'd like to serialize out to a file to be restored and viewed later.
So I tried saving the AbstractTableModel subclass out to a file. Whenever I do this, I get the following error message:
java.io.NotSerializableException: javax.swing.JTable$CellEditorRemover
Now I know for fact that serializing an AbstractTableModel that was installed in a JTable without cell editing works just fine (my old code did exactly that). As a result, I think that the code that handles events in the AbstractTableModel contains references back out to the JTable, which causes the JTable to be saved no matter what (even though I'm just interested in saving the TableModel only). It causes a bigger file than normal, but file size is not an issue. The only issue I have is that CellEditorRemover (an undocumented inner class of JTable), which is automatically installed for JTables with editable cells, is not serializable.
This leads to the following questions:
1. Is there a way to avoid serialization/deserialization of the CellEditorRemover inner class of JTable?
2. Is there a way to save an AbstractTableModel without saving all of the event listeners associated with it?
I think an answer to either of these questions would go a long way towards solving my problem. Otherwise, I'll resign myself to weeping silently in the corner of my office.
Thanks!I would suggest that if you can you only save the
data... but i would do this by using the
externalizable interface.
What you will need to do is have the
writeExternal(ObjectOutputStream out) and
readExternal(ObjectOutputStream out) methods in your
class. These will be responsiable for saving the
data.
Here's an example of what you can do in these
methods... this is just a little tidbit from a program
i've written.public void writeExternal(ObjectOutput out) throws
IOException {
out.writeInt(size);
out.writeObject(drawName);
out.writeInt(playersLength);
for(int i = 0; i < playersLength; i++)
) out.writeObject(players);
out.writeInt(seedsLength);
for(int i = 0; i < seedsLength; i++)
) out.writeObject(seeds[i]);
out.writeInt(drawLength);
for(int i = 0; i < drawLength; i++)
) out.writeObject(draw[i]);
public void readExternal(ObjectInput in) throws
IOException, ClassNotFoundException {
size = in.readInt();
drawName = (String)in.readObject();
playersLength = in.readInt();
for(int i = 0; i < playersLength; i++) players[i] =
= (String)in.readObject();
seedsLength = in.readInt();
for(int i = 0; i < seedsLength; i++) seeds[i] =
= (String)in.readObject();
drawLength = in.readInt();
for(int i = 0; i < drawLength; i++) draw[i] =
= (String)in.readObject();
You can now use your class as you would a Serializable
class, but it will only save the data
Hope this helped
webaf409java
I forgot to add some critical information in my original post. My apologies. :(
I've thought about using Externalizable, but am hesitant to use it because the application would no longer be able to read in files using the old save format (ie, AbstractTableModels for JTables without CellEditorRemovers ). I want to preserve the ability to read the old saved AbstractTableModel formats if possible.
Do you know of a way to revert to the default deserialization mechanism from readExternal? This way, during deserialization, I could do a quick test on the object being read and have the ability to default to the regular deserialization mechanism if the object is of the old type or continue with the new Externalizable stuff if the object is one of the new type. Maintaining file compatibility is key. -
Hi.
Can I disable cell editing in a JTable without using a TableModel and still let the user click on different cells?
/larsYou can subclass JTable and override isCellEditable().
-
FocusLost event for JTable during cell editing
When a cell in a JTable is getting edited, how can I get notified of the focusLost event? I added the focus listener using JTable.addFocusListener, but the focusLost of the listener is not called when a cell inside the table is getting edited (it works fine otherwise). I am aware of the client property terminateEditOnFocusLost to solve this problem in 1.4 but I can't use it since I am still on 1.3.1_04.
Suggestions welcome.http://forum.java.sun.com/thread.jsp?forum=57&thread=431440
-
Single row editing for multiple tables in a single page
Hi!
I have split a table with many many columns into more tables with a lower number of columns. There is an ID column (sequence generated) that is Primary Key common for all tables. Obviously, the relationship between these tables is 1 to 1, so its not about having to build master-detail pages.
What I need now is to edit all these tables in a single page: one single row from each table. The Automated Row Fetch & Automatic Row Processing (DML) processes used for the old table must be replaced by something else.
Is there a way to use in a single page more pairs of such processes for more tables?
I want to avoid manually writing processes with lot of PL/SQL code to handle row fetch & update.
Keep in mind that the page will have an ID item that can be used to identify unique rows in all my tables.
Thanks,
SorinI have split a table with many many columns into more tables with a lower number of columns
IMHO that is a very bad idea. There is nothing wrong with having many columns in a table. If you would like to split them to better "categorize" them, just create views on the table and expose different subsets of the columns.
I want to avoid manually writing processes with lot of PL/SQL code to handle row fetch & update.
That is unavoidable given how you have designed the underlying tables.
You could try creating a view that joins all the tables by the PK and creating a form based on that view. Then write a INSTEAD OF trigger on the view that "doles out" the DML on the view to each of the underlying tables. -
Recognize ENTER hit on JTable after cell edit is done
Hello,
I'm trying to find a way to detect a key press (specifically, Enter key) after editing a value on a JTable. That is, when I double click on a cell in my table, edit the value and press enter after the editing is done, I want to be able to detect pressing the enter. Adding a normal keyListener to the JTable object won't do it. So I'm trying to find a new way. Please help me out!
Here's my SSCCE:
import java.awt.event.KeyAdapter;
import java.awt.event.KeyEvent;
import javax.swing.JFrame;
import javax.swing.JScrollPane;
import javax.swing.JTable;
public class MyTable extends JTable {
JTable table;
public MyTable(Object[][] data, Object[] columnNames)
JFrame frame = new JFrame("My Table");
table = new JTable(data, columnNames);
JScrollPane scrollPane = new JScrollPane(table);
frame.getContentPane().add(scrollPane);
frame.setSize(100, 100);
frame.setVisible(true);
table.addKeyListener(new KeyAdapter()
public void keyPressed(KeyEvent e)
if(e.getKeyChar()==KeyEvent.VK_ENTER)
System.out.println("Key Pressed");
public static void main(String[] args) {
// TODO Auto-generated method stub
Object [][]data = {{"item1"},{"item2"},{"item3"},{"item4"},{"item5"}};
String []columnNames = {"ITEMS"};
MyTable table = new MyTable(data, columnNames);
}Message was edited by:
programmer_girlFirst of all you don't use a KeyListener to check for KeyEvents on a compponent. You use "Key Bindings" and Actions:
http://java.sun.com/docs/books/tutorial/uiswing/misc/keybinding.html
When you are "editing" a cell then focus is on the edtitor used by cell editor. For a cell containing Strings a JTextField is used. Since a JTextField supports an ActionListener all you need to do is get the JTextField and add an ActionListener to the text field. You can use the getDefaultEditor(...) method of JTable and cast the editor to a DefaultCellEditor. From there you can then get the editing component.
Of course the question is why are you specifically worried about the enter key? What if the user tabs to the next cell or uses the mouse to click on a different cell. There is more than one way to finish editing a cell. -
JTable custom cell renderer for each cell
Hi,
Iam trying to implement a JTable in which each cell in a column can be of a different type. i.e it can be a tree node or plain text. Can someone point me to examples where this has been done.
Iam trying to override getColumnClass but it only takes a column no as parameter. I would like to return a different type depending on the row for which getColumnClass is called. It would help if getColumnClass could take 2 params (row and column). Can someone help.
Cheers,
vidyutYou can override getCellRenderer(int row, int column) of JTable
-
UPDATE Statement executing for whole table even when WHERE Clause is presen
Hi Friends,
I have a problem in a stored procedure where i have written an update statement with a where clause. At a time only one row should get updated depending upon unique identifier in where clause.
But whats happening is that Update statement is getting executed for all the rows in the table neglecting the WHERE clause. I am not getting the clue as to why this is happening. Here is the stored Procedure And the update statement is in BOLD :-
CREATE OR REPLACE PROCEDURE MDMADM.proc_MDM_InsertCntryDetails
CntryMasterCode IN VARCHAR2,
CntryName IN VARCHAR2,
MDMUser IN VARCHAR2,
Exist IN INTEGER,
status IN VARCHAR2,
Inserted_By IN VARCHAR2 DEFAULT NULL,
Modified_By IN VARCHAR2 DEFAULT NULL,
Mdm_Code IN NUMBER DEFAULT 0,
Action IN VARCHAR2 DEFAULT 'add',
XGenAttNames IN VARCHAR2 DEFAULT NULL,
XGenAttValues IN VARCHAR2 DEFAULT NULL,
MirusAttNames IN VARCHAR2 DEFAULT NULL,
MirusAttValues IN VARCHAR2 DEFAULT NULL,
GenisysAttNames IN VARCHAR2 DEFAULT NULL,
GenisysAttValues IN VARCHAR2 DEFAULT NULL,
XGenModify IN VARCHAR2 DEFAULT NULL,
MirusModify IN VARCHAR2 DEFAULT NULL,
GenisysModify IN VARCHAR2 DEFAULT NULL
IS
strSQLXGen VARCHAR(1000);
strSQLMirus VARCHAR(1000);
strSQLGenisys VARCHAR(1000);
nMaxMDMCode INTEGER;
ifExist INTEGER;
NAME: proc_MDM_InsertCntryDetails
PURPOSE:
REVISIONS:
Ver Date Author Description
1.0 7/3/2009 1. Created this procedure.
NOTES:
Automatically available Auto Replace Keywords:
Object Name: proc_MDM_InsertCntryDetails
Sysdate: 7/3/2009
Date and Time: 7/3/2009, 7:11:20 PM, and 7/3/2009 7:11:20 PM
Username: (set in TOAD Options, Procedure Editor)
Table Name: (set in the "New PL/SQL Object" dialog)
BEGIN
SELECT COUNT(*) INTO ifExist FROM MDM_COUNTRY_MASTER;
IF ifExist = 0 THEN
SELECT 1 INTO nMaxMDMCode FROM DUAL;
ELSE
SELECT MAX(MDM_CODE)+1 INTO nMaxMDMCode FROM MDM_COUNTRY_MASTER;
END IF;
IF Action='add' THEN
INSERT INTO MDM_COUNTRY_MASTER(MDM_CODE,MDM_MASTER_CODE,MDM_DESCRIPTION,MDM_USER,MDM_EXIST,MDM_STATUS,MDM_ACTION,DAT_INSERT_DATE,DAT_INSERTED_BY)
VALUES(nMaxMDMCode,CntryMasterCode,CntryName,MDMUser,Exist,status,Action,SYSDATE,Inserted_By);
strSQLXGen := 'INSERT INTO MDM_COUNTRY_MAPPING(MDM_CODE,SYSTEM_NAME,SYSTEM_CODE,' || XGenAttNames || ',DAT_INSERTED_BY,DAT_INSERT_DATE) ' ||
'VALUES(' || nMaxMDMCode || ',' || '''' || 'XGen' || '''' || ',1,' || XGenAttValues || ',' || '''' || Inserted_By || '''' || ',SYSDATE)';
EXECUTE IMMEDIATE strSQLXGen;
strSQLMirus := 'INSERT INTO MDM_COUNTRY_MAPPING(MDM_CODE,SYSTEM_NAME,SYSTEM_CODE,' || MirusAttNames || ',DAT_INSERTED_BY,DAT_INSERT_DATE) ' ||
'VALUES(' || nMaxMDMCode || ',' || '''' || 'Mirus' || '''' || ',2,' || MirusAttValues || ',' || '''' || Inserted_By || '''' || ',SYSDATE)';
EXECUTE IMMEDIATE strSQLMirus;
strSQLGenisys := 'INSERT INTO MDM_COUNTRY_MAPPING(MDM_CODE,SYSTEM_NAME,SYSTEM_CODE,' || GenisysAttNames || ',DAT_INSERTED_BY,DAT_INSERT_DATE) ' ||
'VALUES(' || nMaxMDMCode || ',' || '''' || 'Genisys' || '''' || ',3,' || GenisysAttValues || ',' || '''' || Inserted_By || '''' || ',SYSDATE)';
EXECUTE IMMEDIATE strSQLGenisys;
ELSE
UPDATE MDM_COUNTRY_MASTER
SET MDM_DESCRIPTION=CntryName,DAT_MODIFIED_BY=Modified_By,DAT_MODIFY_DATE=SYSDATE,
MDM_USER=MDMUser,MDM_ACTION=Action,MDM_STATUS=status,MDM_EXIST=Exist WHERE MDM_CODE=Mdm_Code;
SELECT COUNT(*) INTO ifExist FROM MDM_COUNTRY_MAPPING WHERE SYSTEM_CODE=1 AND MDM_CODE=Mdm_Code ;
IF ifExist = 0 THEN
strSQLXGen := 'INSERT INTO MDM_COUNTRY_MAPPING(MDM_CODE,SYSTEM_NAME,SYSTEM_CODE,' || XGenAttNames || ',DAT_INSERTED_BY,DAT_INSERT_DATE) ' ||
'VALUES(' || Mdm_Code || ',' || '''' || 'XGen' || '''' || ',1,' || XGenAttValues || ',' || '''' || Modified_By || '''' || ',SYSDATE)';
EXECUTE IMMEDIATE strSQLXGen ;
ELSE
strSQLXGen := 'UPDATE MDM_COUNTRY_MAPPING SET ' || XGenModify || ',DAT_MODIFY_DATE=SYSDATE,DAT_MODIFIED_BY=' || '''' || Modified_By || '''' || ' WHERE MDM_CODE=' || Mdm_Code || ' and SYSTEM_CODE=1' ;
EXECUTE IMMEDIATE strSQLXGen ;
END IF;
SELECT COUNT(*) INTO ifExist FROM MDM_COUNTRY_MAPPING WHERE SYSTEM_CODE=2 AND MDM_CODE=Mdm_Code ;
IF ifExist = 0 THEN
strSQLMirus := 'INSERT INTO MDM_COUNTRY_MAPPING(MDM_CODE,SYSTEM_NAME,SYSTEM_CODE,' || MirusAttNames || ',DAT_INSERTED_BY,DAT_INSERT_DATE) ' ||
'VALUES(' || Mdm_Code || ',' || '''' || 'Mirus' || '''' || ',2,' || MirusAttValues || ',' || '''' || Modified_By || '''' || ',SYSDATE)';
EXECUTE IMMEDIATE strSQLMirus ;
ELSE
strSQLMirus := 'UPDATE MDM_COUNTRY_MAPPING SET ' || MirusModify || ',DAT_MODIFY_DATE=SYSDATE,DAT_MODIFIED_BY=' || '''' || Modified_By || '''' || ' WHERE MDM_CODE=' || Mdm_Code || ' and SYSTEM_CODE=2' ;
EXECUTE IMMEDIATE strSQLMirus ;
END IF;
SELECT COUNT(*) INTO ifExist FROM MDM_COUNTRY_MAPPING WHERE SYSTEM_CODE=3 AND MDM_CODE=Mdm_Code;
IF ifExist = 0 THEN
strSQLGenisys := 'INSERT INTO MDM_COUNTRY_MAPPING(MDM_CODE,SYSTEM_NAME,SYSTEM_CODE,' || GenisysAttNames || ',DAT_INSERTED_BY,DAT_INSERT_DATE) ' ||
'VALUES(' || Mdm_Code || ',' || '''' || 'Genisys' || '''' || ',3,' || GenisysAttValues || ',' || '''' || Modified_By || '''' || ',SYSDATE)';
EXECUTE IMMEDIATE strSQLGenisys ;
ELSE
strSQLGenisys := 'UPDATE MDM_COUNTRY_MAPPING SET ' || GenisysModify || ',DAT_MODIFY_DATE=SYSDATE,DAT_MODIFIED_BY=' || '''' || Modified_By || '''' || ' WHERE MDM_CODE=' || Mdm_Code || ' and SYSTEM_CODE=3' ;
EXECUTE IMMEDIATE strSQLGenisys ;
END IF;
END IF;
EXCEPTION
WHEN NO_DATA_FOUND THEN
NULL;
WHEN OTHERS THEN
-- Consider logging the error and then re-raise
RAISE;
END proc_MDM_InsertCntryDetails;
ThanksIt might be helpful to search this forum and google for PL/SQL (variables, stored procs, etc) naming standards. There are quite a few out there and you can choose one that works for you.
As an example, a lot of standards adopt naming prefixes, ie v_ for VARCHAR variable, n_ for NUMBER variable, pv_ for paramater VARCHAR, etc. -
How to disable all Constraints for a Table
Hi There,
So I have a table that I need to delete a significant amount of records from. Using some advice I found it better to select the records that I wanted to keep into a temporary table and then truncate the original table. After that I insert the contents of the temp table into the original table.
So now I am thinking I could speed this up even more if I disable all the constraints on the original table.
Is there an easy way to do this or do I need to disable each constraint individually?
thanks
Johnhttp://forums.oracle.com/forums/search.jspa?threadID=&q=disable+all+constraints+&objID=c84&dateRange=all&userID=&numResults=15
-
Facet for more than one column (but not for whole table)
Hi all.
Let's imagine we have dataTable with five columns. We can set facet (i.e. header) for the columns altogether or for each of them separetely. But is there any way to set header for only first three of them? like this:
____some header ____ | header | header |
value 1 | value 2 | value 3 | value 4 | value 5 |
value 6 | value 7 | value 8 | value 9 | value 10 |
Any help is appreciated.This might not be the best approach if the file is huge, but if you nest the comparators, you can do this.
Create a comparator that takes 2 other comparators as input, the primary and seconday. The compare method compares the inputs based on the primary comparator. If the result is not zero, then you have your answer. If the result is 0, then delegate to the secondary comparator. In the past I've created an abstract class to do the primary/secondary behavior, then had an abstract doCompare method that does the actual comparison. The secondary comparator can itself be a nested comparator, if necessary.
john -
Question(s) about the Active Cell:Position property node for a table control
Hello,
What determines the Active Cell Position property node for a table control? I have this in my code and I am displaying its value to a front panel indicator. The value displayed is always set to 0,0. The help for the property node say that it is "read -only" so what sets the value of Active Cell Position for a Table Control?
Regards,
Kaspar
Solved!
Go to Solution.You set the active cell with a property node. Once you select an active cell, you can do specific things to that cell and that cell alone, things like set the background color.
There are only two ways to tell somebody thanks: Kudos and Marked Solutions
Unofficial Forum Rules and Guidelines -
Hi All,
I found this:
http://blog.classsoftware.com/index.cfm/2007/6/11/Flex-Datagrid-Edit-Cell-on-Row-Click
How can I do the other way around?
I have a column that is enable for edit but base in some condition I want to disable the edit for entire row in my datagrid.
Thanks
JohnnyHow Alex?
I add ITEM_EDIT_BEGINNING event in my advanced datagrid to call a function like:
private function disableRow(event:AdvancedDataGridEvent):void{
if(event.dataField=="FIELD_03"){
var temp:String = event.itemRenderer.data["FIELD_02"]; //Here I capture value of my 2nd column
if (temp == "MyCondition")
//Here I want to block the editing
Thanks for your help and reply.
Johnny -
Hi guys n girls. How do you copy a whole table to create a new table with all cell sizes in tact? Thanks for your help. Jason.
when you copy n paste into a new table, all the cell sizes are changed.
is there a way to put in a new table from your templates into an existing file, different to the standard very basic ones in insert table.
I look forward to your answers. Your help is very much appreciated.
Also how do you search for question answers already written in this support area please.Hi Jason,
In Numbers 3, you can select a whole table by clicking once in the table to make it active, then click once on the "bull's eye" at the top left.
Now copy and paste. All formatting (and any cell content) is pasted intact. In Numbers 2.3 (Numbers '09) it is a little different for selecting a whole table. But I won't go into that unless you are using Numbers '09. Please reply.
I don't like the look of the tables in Insert Table. I keep custom tables in My Templates. I have set Numbers > Preferences > General > For New Documents > Use template: (name of my favourite custom template)
That opens when I launch Numbers, or ask for a new document (command n). Note that if you follow this preference setting, then Menu > File > New From Template Chooser (for another template) requires you to hold down the option key in that menu.
Regards,
Ian.
Message was edited by: Yellowbox. All formatting (and any cell content) is pasted intact. -
How can i make perticular row or perticular cell Editable of a JTable
Dear al,
can u help me by guiding me for the problem of...
i am having a JTable, in which a (first)column of each row is having a checkbox field.
If the checkbox is checked then and then i should able to modify the cells in that row where the checkbox is.
I have created the table with AbstractTableModel of which the isCellEditable(int row, int col) method is overwriten. Whatever return value (true/false) reflects the perticular
cells becomes editable/non-editable respectively.
but at run time...(mean the table is created now) and now i want to make the cells editable/non-editable depending on the checkbox value...
how can i implement it.........
please suggest.........
thank you.........here is the sample code from tutorial.......
* TableRenderDemo.java requires no other files.
import java.awt.Component;
import java.awt.Dimension;
import java.awt.GridLayout;
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;
* TableRenderDemo is just like TableDemo, except that it explicitly initializes
* column sizes and it uses a combo box as an editor for the Sport column.
@SuppressWarnings("serial")
public class TableRenderDemo extends JPanel {
private boolean DEBUG = true;
public TableRenderDemo() {
super(new GridLayout(1, 0));
JTable table = new JTable(new MyTableModel());
// table.setEditingColumn(0);
// table.editCellAt(0, 0);
table.setPreferredScrollableViewportSize(new Dimension(500, 100));
// Create the scroll pane and add the table to it.
JScrollPane scrollPane = new JScrollPane(table);
// Set up column sizes.
initColumnSizes(table);
// Fiddle with the Sport column's cell editors/renderers.
setUpSportColumn(table, table.getColumnModel().getColumn(2));
// Add the scroll pane to this panel.
add(scrollPane);
* This method picks good column sizes. If all column heads are wider than
* the column's cells' contents, then you can just use
* column.sizeWidthToFit().
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 < 5; 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, false,
false, 0, i);
cellWidth = comp.getPreferredSize().width;
if (DEBUG) {
System.out.println("Initializing width of column " + i + ". "
+ "headerWidth = " + headerWidth + "; cellWidth = "
+ cellWidth);
// XXX: Before Swing 1.1 Beta 2, use setMinWidth instead.
column.setPreferredWidth(Math.max(headerWidth, cellWidth));
public void setUpSportColumn(JTable table, TableColumn sportColumn) {
// Set up the editor for the sport cells.
JComboBox comboBox = new JComboBox();
comboBox.addItem("Snowboarding");
comboBox.addItem("Rowing");
comboBox.addItem("Knitting");
comboBox.addItem("Speed reading");
comboBox.addItem("Pool");
comboBox.addItem("None of the above");
sportColumn.setCellEditor(new DefaultCellEditor(comboBox));
// Set up tool tips for the sport cells.
DefaultTableCellRenderer renderer = new DefaultTableCellRenderer();
renderer.setToolTipText("Click for combo box");
sportColumn.setCellRenderer(renderer);
class MyTableModel extends AbstractTableModel {
private String[] columnNames = { "First Name", "Last Name", "Sport",
"# of Years", "Vegetarian" };
private Object[][] data = {
{ "Mary", "Campione", "Snowboarding", new Integer(5),
new Boolean(false) },
{ "Alison", "Huml", "Rowing", new Integer(3), new Boolean(true) },
{ "Kathy", "Walrath", "Knitting", new Integer(2),
new Boolean(false) },
{ "Sharon", "Zakhour", "Speed reading", new Integer(20),
new Boolean(true) },
{ "Philip", "Milne", "Pool", new Integer(10),
new Boolean(false) } };
public final Object[] longValues = { "Sharon", "Campione",
"None of the above", new Integer(20), Boolean.TRUE };
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];
* JTable uses this method to determine the default renderer/ editor for
* each cell. If we didn't implement this method, then the last column
* would contain text ("true"/"false"), rather than a check box.
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;
return true;
* Don't need to implement this method unless your table's data can
* change.
public void setValueAt(Object value, int row, int col) {
if (DEBUG) {
System.out.println("Setting value at " + row + "," + col
+ " to " + value + " (an instance of "
+ value.getClass() + ")");
data[row][col] = value;
fireTableCellUpdated(row, col);
if (DEBUG) {
System.out.println("New value of data:");
printDebugData();
private void printDebugData() {
int numRows = getRowCount();
int numCols = getColumnCount();
for (int i = 0; i < numRows; i++) {
System.out.print(" row " + i + ":");
for (int j = 0; j < numCols; j++) {
System.out.print(" " + data[i][j]);
System.out.println();
System.out.println("--------------------------");
* Create the GUI and show it. For thread safety, this method should be
* invoked from the event-dispatching thread.
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.
TableRenderDemo newContentPane = new TableRenderDemo();
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) {
// Schedule a job for the event-dispatching thread:
// creating and showing this application's GUI.
javax.swing.SwingUtilities.invokeLater(new Runnable() {
public void run() {
createAndShowGUI();
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