Deleting rows from a JTable

Hello,
I've got a JTable which is based on a 2-dimensional array, which contains my data. Now I want to delete several rows from the JTable. There's the possibility to modify my data-array by creating a new array which doesn't contain anymore the datasets I want to delete. Afterwards I can redraw the table and my rows are deleted. But I think that's a very complicated way to delete rows from a JTable. Can anybody tell me whether ther's an easier way to do so ? I'd really be pleased...
Thanx,
Findus

When you create a TableModel using a two-dimensional array or a Vector of Vectors, a DefaultTableModel is created and it stores the data in its own Vector of Vectors. The DefaultTableModel supports methods for adding/removing rows of data. To remove the first row in the table you would do something like:
DefaultTableModel model = (DefaultTableModel)table.getModel();
model.removeRow( 0 );
Note: once you create the TableModel you should set your array to null as it is not used anymore.

Similar Messages

Problem deleting rows from a JTable

I've got an editable JTable and a button outside that deletes rows selected by a user from the model. The problem is that if the user has clicked on an editable cell in the table, while rest of the information in that row is deleted, the entry in the editable cell remains. So even though the entry has been deleted from the model, the JTable does not update correctly. I am using a custom editor/renderer for the editable cells.
So it appears that I need to get my custom editor to release, i.e., stop editing on demand, so I can reset the information on the entire row properly.
Any ideas how I can do so ?
Thanks, Bhishma

Thanks that worked perfectly ! Full points assigned.
In case the above link stops working the solution that worked for me was using a client property as below.
jTable1.putClientProperty("terminateEditOnFocusLost", Boolean.TRUE);
Ciao.
Edited by: Bhishma on Dec 20, 2008 7:53 PM

Deleting rows from a JTable using DefaultTableModel

First of all, is it possible to remove a row of information from a table that uses the DefaultTableModel?
I have created a table using the default table model as follows:
          tblPhoneNumbers = new JTable(new DefaultTableModel(
                    new Object[][]{{"",""}},
                    new Object[]{"Number", "Type"})
I then have a button that when clicked is supposed to remove the selected row from the table:
     protected void btnRemovePhoneActionPerformed(ActionEvent evt) {
          DefaultTableModel phoneDm = (DefaultTableModel) tblPhoneNumbers.getModel();
          int selectedRow = tblPhoneNumbers.getSelectedRow();
          int numRows = tblPhoneNumbers.getRowCount();
          if(selectedRow >= 0 && selectedRow < numRows-1)
               phoneDm.removeRow(selectedRow);
By calling the removeRow() method it is updating the table in the dialog just fine, and shifting all of the information up to where it belongs. But if for example I remove the first row, and then try to access the information in the first row, the information I supposedly just removed is still there.
Am I supposed to be firing an event on removing that row to manually update the data in the table? If so, how would I do that?
It seems like this should be really easy to do I just can't for the life of me figure out what I'm doing wrong.
Thanks

But if for example I remove the first row, and then try to access the
information in the first row, the information I supposedly just removed is still there.Never seen that before.
If you need further help then you need to create a [url http://homepage1.nifty.com/algafield/sscce.html]Short, Self Contained, Compilable and Executable, Example Program (SSCCE) that demonstrates the incorrect behaviour, because I can't guess exactly what you are doing based on the information provided.
Don't forget to use the [url http://forum.java.sun.com/help.jspa?sec=formatting]Code Formatting Tags so the posted code retains its original formatting.

Deleting a row from a JTable using a custom TableModel

Before I waste any of your time I would like to go ahead and just say that I have searched through the forum using "delete row from Jtable" as the search keywords and while I have found very closely related issues, they have not solved my problem. I have found code postings by carmickr and his arguments as to why we should use DefaultTableModel instead of having created our own custom TableModel, and while I do agree, I just am not quite confident enough in applying it to my scenario. See I am reading from a file a bunch of Contractor objects and I am stuffing it into an arraylist which I am using in the following code posting to populate my TableModel which the JTable object in the gui then uses.
My problem is that everything works except when I delete and when I delete I understand that the index is changing because I just removed a row from the arraylist object. Suppose I have 33 rows displaying in the GUI. Now after I delete say row #23, the delete function works and dutifuly the row disappears from the table, but if I try to delete a row say...the last row, it does not work and throws me an IndexOutOfBoundsException which totally makes sense. My question is how do I go about fixing it? Do I have to do something with the setRowCount method?
Any help is appreciated.
Cheers,
Surya
* ContractorTableModel.java
* Created on January 12, 2006, 11:59 PM
package code.suncertify.gui;
import java.util.ArrayList;
import java.util.logging.Logger;
import javax.swing.table.AbstractTableModel;
import code.suncertify.db.Contractor;
* @author Surya De
* @version 1.0
public class ContractorTableModel extends AbstractTableModel {
     * The Logger instance. All log messages from this class are routed through
     * this member. The Logger namespace is <code>sampleproject.gui</code>.
    private Logger log = Logger.getLogger("code.gui");
     * An array of <code>String</code> objects representing the table headers.
    private String [] headerNames = {"Record Number", "Contractor Name",
    "Location", "Specialties","Size", "Rate",
    "Owner"};
     * Holds all Contractor instances displayed in the main table.
    private ArrayList <Object> contractorRecords = new ArrayList<Object>(5);
     * Returns the column count of the table.
     * @return An integer indicating the number or columns in the table.
    public int getColumnCount() {
        return this.headerNames.length;
     * Returns the number of rows in the table.
     * @return An integer indicating the number of rows in the table.
    public int getRowCount() {
        return this.contractorRecords.size();
     * Gets a value from a specified index in the table.
     * @param row An integer representing the row index.
     * @param column An integer representing the column index.
     * @return The object located at the specified row and column.
    public Object getValueAt(int row, int column) {
        Object [] temp = (Object[]) this.contractorRecords.get(row);
        return temp[column];
     * Sets the cell value at a specified index.
     * @param obj The object that is placed in the table cell.
     * @param row The row index.
     * @param column The column index.
    public void setValueAt(Object obj, int row, int column) {
        Object [] temp = (Object []) this.contractorRecords.get(row);
        temp [column] = obj;
     * Returns the name of a column at a given column index.
     * @param column The specified column index.
     * @return A String containing the column name.
    public String getColumnName(int column) {
        return headerNames[column];
     * Given a row and column index, indicates if a table cell can be edited.
     * @param row Specified row index.
     * @param column Specified column index.
     * @return A boolean indicating if a cell is editable.
    public boolean isCellEditable(int row, int column) {
        return false;
     * Adds a row of Contractor data to the table.
     * @param specialty
     * @param recNo The record number of the row in question.
     * @param name The name of the contractor.
     * @param location Where the contractor is located
     * @param size Number of workers for the contractor
     * @param rate The contractor specific charge rate
     * @param owner Name of owner
    public void addContractorRecord(int recNo, String name,
            String location, String specialty,
            int size, float rate, String owner) {
        Object [] temp = {new Integer(recNo), name,
        location, specialty, new Integer(size),
        new Float(rate), owner};
        this.contractorRecords.add(temp);
        fireTableDataChanged();
     * Adds a Contractor object to the table.
     * @param contractor The Contractor object to add to the table.
    public void addContractorRecord(Contractor contractor) {
        Object [] temp = {new Integer(contractor.getRecordNumber()),
        contractor.getName(), contractor.getLocation(),
        contractor.getSpecialties(), new Integer(contractor.getSize()),
        new Float(contractor.getRate()), contractor.getCustomerID()};
        this.contractorRecords.add(temp);
        fireTableDataChanged();
     * Deletes a row of Contractor data to the table.
     * @FIXME Now that I deleted a row then I will have to reset the internal structure so that I can delete again
     * @param recNo The record number of the row in question.
    public void deleteContractorRecord(int recNo) {
        contractorRecords.remove(recNo - 1);
        fireTableRowsDeleted(recNo -1, recNo - 1);
}

Wow that was a very quick response. Thanks camickr. I am only trying to delete a single row. I do not know how to go about posting a test program for the code I have posted above because honestly the gui itself is 800 lines of code, and then the file reading class is quite funky in itself. I can maybe email you the entire Netbeans project including code so if you are using Netbeans 5 RC2 you can run the code and see for yourself, but that would not be considerate of me.
See I am trying to delete any row at any time...but only one at a time not multiple rows...so if a user decides to delete row 23 and then tries to delete the last row which happens to be row 33 in my case, my setup should be smart enough to still allow to delete the row.

Delete rows from table...Bizarre problem.

Folks
i HAVE this bizarre problem.
I hava a Java class which displays data read into a table with a delete
option by the side of each row.
Now lets assume you have 3 rows in the Table.
abc deleteButton
efg deleteButton
xyz deleteButton
When I click the first delete,that row gets deleted from the table.(perfect...)
Now I have 2 rows.
When I click on the first row,I get the error
'You clicked -1'
java.lang.ArrayIndexOutofBoundsException: -1 < 0.
Can anyone tell me why this is happening even though there are rows in the table.???
ActionListener al = new ActionListener() {
public void actionPerformed(ActionEvent e) {
System.out.println("You clicked row : " + table.getSelectedRow());
javax.swing.table.TableModel model = table.getModel();
Object o = model.getValueAt(table.getSelectedRow(),0);
//System.out.print(model.getValueAt(table.getSelectedRow(), 0));
//System.out.println();
MyDeleteFunction(o.toString());
// Delete row from window.
((DefaultTableModel)table.getModel()).removeRow(table.getSelectedRow());
table.revalidate();
table.repaint();

Hi ritu,
This class is called
new DisplayCall_IDTodisconnect(hashTable);
its a long file.
its attached below.
The rows are displayed by reading a hashtable into a vector
and the vector is iterated and appended..
public class DisplayCall_IDToDisconnect {
public static JTable createTable(Vector data, String buttonLabel, ActionListener action){
return createTable(data.iterator(), buttonLabel, action);
public static JTable createTable(
Iterator dataIterator,
String buttonLabel,
ActionListener action) {
DefaultTableModel model = new DefaultTableModel() {
public boolean isCellEditable(int row, int col) {
return col == 1;
model.setColumnCount(2);
while (dataIterator.hasNext()) {
Object[] row = { dataIterator.next().toString(), null };
model.addRow(row);
DefaultTableColumnModel columnModel = new DefaultTableColumnModel();
columnModel.addColumn(new TableColumn(0, 100));
columnModel.addColumn(new TableColumn(1, 80,
new TableButtonCellRenderer(buttonLabel),
new TableButtonCellEditor(buttonLabel, action)
JTable table = new JTable(model, columnModel) {
public void valueChanged(ListSelectionEvent e) {
super.valueChanged(e);
table.setSelectionMode(ListSelectionModel.SINGLE_SELECTION);
return table;
private static class TableButtonCellRenderer implements TableCellRenderer {
final JButton button;
TableButtonCellRenderer(String buttonLabel) {
button = new JButton(buttonLabel);
public Component getTableCellRendererComponent(
JTable table,
Object value,
boolean isSelected,
boolean hasFocus, int row, int column) {
return button;
private static class TableButtonCellEditor
extends AbstractCellEditor
implements TableCellEditor, ActionListener {
final JButton button;
final ActionListener callback;
TableButtonCellEditor(String buttonLabel, ActionListener callback) {
button = new JButton(buttonLabel);
this.callback = callback;
button.addActionListener(this);
public Component getTableCellEditorComponent(
JTable table,
Object value,
boolean isSelected,
int row, int column) {
return button;
public Object getCellEditorValue() {
return null;
public void actionPerformed(ActionEvent e) {
button.getParent().requestFocus();
callback.actionPerformed(e);
static JTable table;
Vector items;
final ClientManager clientMgr;
// Constructor.
public DisplayCall_IDToDisconnect(Hashtable callLegTable,ClientManager clientMgr){
Vector vCSeqnos = displayCSeqNos(callLegTable);
this.clientMgr = clientMgr;
JFrame frame = new JFrame("Disconnect Options");
/*Vector*/ items = new Vector();
Enumeration vEnum = vCSeqnos.elements();
while(vEnum.hasMoreElements()){
items.add(vEnum.nextElement());
ActionListener al = new ActionListener() {
public void actionPerformed(ActionEvent e) {
//System.out.println("You clicked row ,col: " + table.getSelectedRow()+
// table.getSelectedColumn());
javax.swing.table.TableModel model = table.getModel();
Object o = model.getValueAt(table.getSelectedRow(),0);
System.out.print(model.getValueAt(table.getSelectedRow(), 0));
System.out.println();
closeConnection(o.toString());
// Delete row from window too.
((DefaultTableModel)table.getModel()).removeRow(table.getSelectedRow());
table.revalidate();
table = DisplayCSeqNos.createTable(items, "Disconnect", al);
frame.getContentPane().add(new JScrollPane(table));
frame.pack();
frame.show();
} // End Constructor.
public void closeConnection(String s){
/*1. Disconnect the current session*/
this.clientMgr.disconnectCall(s);
/*2. refresh the Disconnect window*/
this.refreshWindow();
public Vector displayCSeqNos(Hashtable callLegTable){
Enumeration eNum;
String str;
Vector v = new Vector();
eNum=callLegTable.keys();
while(eNum.hasMoreElements()){
str = (String) eNum.nextElement();
//System.out.println("Key : " + str + " Value : " + callLegTable.get(str));
v.addElement(str);
return v;
} // End of displayCSeqNos.

Removing rows from a JTable

How can i remove a row from a JTable??

You need to extends AbstractTableModel rather than use DefaultTableModel as I think from memory this just uses an array to store data.
If you use a vector in your subclass to store your rows, then you can do something like this:
    public boolean delete(int rowIndex)
        if (rowIndex < 0 || rowIndex >= rowVector.size())
            return false;
        else
            int day = 0;
            MyRowClass row = rowVector.get(rowIndex);
            rowVector.remove(rowIndex);
            rowCount--;
            fireTableRowsDeleted(rowIndex, rowIndex);
            return true;
    }HTH
Paul C.

Delete Rows from T1 which are Not in T2

Hi
I've 2 Tables like below
T1
N1
N2
2
11
2
22
3
33
8
44
8
88
T2
N1
N2
2
22
8
88
If I Run Delete query, I must delete Rows from T1 which are Not in T2
For example, I must delete Rows 1,3,4 from T1
So how to write that delete query? Please advice

Delete from T1
Where not Exists (select * from T2 Where t1.N1=t2.N1 and t1.N2=t2.N2)
--or
Delete t
From t1 t
left JOIN t2 m
ON m.N1=t.N1 and m.N2=t.N2
WHERE m.N1 is null and m.N2 is null
--Or
;With mycte as
select N1,N2 from T1
Except
select N1,N2 from T2
Delete t
From t1 t
INNER JOIN mycte m
ON m.N1=t.N1 and m.N2=t.N2

Cannot DELETE rows from LOV on running...is it a bug ??

One of the features I appreciated in the new version of JHeadstart is that we can now insert, modify and delete rows on LOV (even in the database).
We have just to check on Lookup properties :
Multi-row insert allowed
Multi-row update allowed
Multi-row delete allowed
I cheked all of them and on runnig I could insert and update records in LOV.
When I tried to delete records from LOV the system display information message "nothing to save" and in fact no records were deleted.
Normally since I checked the delete property it should be possible to delete rows from LOV
thanks for any Help

Monta,
I could reproduce this, it is a bug. Added to the fix list for the next release.
Thanks for reporting,
Steven Davelaar,
JHeadstart Team.

Unable to delete rows from Target.

Hello everyone,
I am unable to delete rows from target data store. Here is what I have done.
Source Oracle 10g - staging 11g - Target Oracle 11g
I have implemented consistent set CDC on data model in staging and added 2 tables to CDC and turned on the journals . Both tables A and B are joined together via Column E (primary key of table A). Table A is the master table(has foreign key). Table B is child table. Target column consists of all the columns of both table A and B.
Following is what I am able to do and not to do
ABLE TO DO. If data is inserted into both or any of journalized tables I can successfully load the same in target by performing following steps. 1. Extend the consistency window at model level. Lock subscriber. Run the interface with any source table marked as Journalized data only. Unlock subscriber and purge journal.
ABLE TO DO. If data is updated in any of the journalized table, along with the steps mentioned above I can execute two interfaces. In one Interface table A marked as journalized data only Joined with table B and in second interface table B marked as Journalized data only joined to table a.
NOT ABLE TO DO If data is deleted from one or both tables it shows up as journalized data in JV$D<tablename> marked as D with date and subscriber name but when i run the interface by extending the window , locking subscriber executing both interfaces, unlock subscriber purge journals. no change takes place is Target. After unlocking subscriber step, journalized data gets removed from JV$D view. Please let me know what I am doing wrong here. How can rows delted from source can also be deleted from TARGET?
NOTE : In the flow table SYNC_JRNL_DELETES is YES
In moel under jounalized table tab Table have following order Table A folloed by Table B
Thanks in advance
Greenwich

Sorry I still do not get it. when you say "Its a legacy app", are you talking about the VB.NET app ?
If so then I repeat my self :-) Why not to connecting to the SQL server directly?
* even if you need information from several databases (for example ACCESS + SQL Server), in most cases, it is much better to connect directly and get each information to the app. Then in your app you can combine the information and analyse it
[Personal Site] [Blog] [Facebook]
Access app is the legacy app.

Deleting rows from a table

COuld anyone tell me how to delete rows from a table which has millions of rows.
TIA,
Oracle user

if you are deleting all the rows, use "truncate table" in sql*plus.
or if you are deleting all but a handful of rows, then copy the rows you still want to a spare table, drop the original table, and rename the spare table back to the original table's name.
hope this helps

Oracle deleting rows from tables starting with the name PQ

hai friends
we are given access rights to delete only tables starting with PQ. HAVING PQ_NUM as primary key for all the PQ tables.
totally we have 6 tables. PQ_01,PQ_02, PQ_03,PQ_04,PQ_05,PQ_06.
ALL This tables will have one primary key. for example pq_01 willl have pq01_num as primarykey and pq_02 table will have pq02_num as primary
key.
pq01_num value will exist in all the primary key of pq tables.
i want query to delete rows from the pq tables based on the input value i give.
for example if i give primarykey value 122 then that value in pq tables should be deleted.
One more problem is there. pq_06 table does not have pq02_num column. here the column differs. it is pq06_num_req.
so give your idea of deleting the rows from pq tables
waiting
S

I dont have access to databse,this is untested
declare
v_cmd varchar2(2000);
columnname varchar2(30);
input_value number:=??;
tabowner varchar2(30):=???
begin
--step 1 identify table
FOR sub IN (SELECT table_name table_to_delete
FROM all_tables
WHERE table_name LIKE 'PQ%'
and owner=tabowner
) LOOP
----step 2 identify column
v_cmd :='select t.column_name from all_constraints S,All_Ind_Columns T where
S.OWNER=T.TABLE_OWNER
AND S.TABLE_NAME=T.TABLE_NAME
AND S.INDEX_NAME=T.INDEX_NAME
and s.owner=tabowner
AND S.TABLE_NAME='||table_to_delete||'
and s.constraint_type='''P'';
     execute immediate v_cmd into columnname;
     --step 3 delete records
    v_cmd := 'delete from '||tabowner||'.' ||
             sub.table_to_delete || '
   where '||columnname||'='||input_value;
     execute immediate v_cmd;
    commit;
     END LOOP;
end;Edited by: user5495111 on Aug 11, 2009 6:35 AM

Delete rows from Tabular form

Hi,
Anyone knows how dynamicly delete rows from Tabular Form (on button click, button is as item)?
Thanks.

I am in a great fix. We had a test instance.. and we had a version apex 3.2.. But when the same application has been uploaded to prod.. we used apex 4.0.Why on Earth would you do this? The whole point of the testing is to verify that the application will work in the production environment: the first requirement for this is that the test and production environments are equivalent.
has any body is facing the same issue as mine..Yes, as is easily discovered by searching the forum...see Delete button doesn't work in tabular form after upgrade from APEX3.2 to 4.

Add/Delete rows from ALV-grid

Hi to all,
i have 2 questions concerning alv-grids:
i have an alvgrid displaying a table and what i need is some functionality to add or delete rows from the alvgrid - how can i do that ?
within one row i have one field containing the status and i want to be able to select the status from a combo/dropdown-field and set it for this particular row.
thanks in advance!

Hi,
Report BCALV_EDIT_04 shows how to append and delete rows.
Report BCALV_EDIT_06 shows drop down list for cells in a column.
These report should be available in any R/3 system including all ABAP Preview versions.
Hope this can help.
Regards, Johan

Selecting rows from a JTable using keys

Hi all, be very grateful for some help on this.
I want to provide functionality in an application where the user will be able to select multiple rows from a JTable by using the page up/ page down button.
Anybody know how this can be done?
Thanks

Just add a KeyListener to the table which does what you want on pressing the relevant key.
it seems a bit odd though. If I pressed page up/down in a table I'd expect it to scroll and would be somewhat confused if it started selecting stuff. Generally it's best not to muck around with the default behaviour of UI components.

Getting the Selected Row from a JTable

hi,
how Can i get the Selected row from a JTable
thanks...

You know that JTable class? Well, you see those methods in it called "getSelectedRow()" and "getSelectedRows()"...?

Deleting rows from a JTable

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