Removing Rows in JTable

I Wrote an application to display the report of sales in JTable format and create a button "cancel" to remove all rows in the JTable.
DefaultTableModel dtm=new DefaultTableModel();
JTable t=new JTable(dtm);
if(e.getSource()==cancel)
int i=0;
int rows=t.getRowCount();
while(i<rows)
dtm.removeRow(i);
i++;
When I click cancel,all rows are not removed.I have to click more than one time to cancel all the rows.kindly help me to remove all rows in the JTable in a single click.
Thanks in advance.

int i=0;
int rows=t.getRowCount();
while(i<rows)
dtm.removeRow(i);
i++;
When I click cancel,all rows are not removed.I have to
click more than one time to cancel all the rows.kindly
help me to remove all rows in the JTable in a single
click.Yeah, first you remove row0, and the previous row1 becomes row0, but you increase i, and remove the new row1 that is the previous row2, and so on. You should instead:
int rows = dtm.getRowCount();
while (--rows >= 0) {
dtm.removeRow(rows);

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I am trying to add /remove rows from JTable whose first column is JButton and others are JComboBox's.If no rows are selected,new row is added at the end.If user selects some row & then presses insert button,new row is added below it.Rows can only be deleted if user has made some selection.Kindly help me,where i am making mistake.If any function is to be used.My code is as follows....
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import javax.swing.table.*;
import javax.swing.border.*;
public class JButtonTableExample extends JFrame implements ActionListener{
JComboBox mComboLHSType = new JComboBox();
JComboBox mComboRHSType = new JComboBox();
JLabel mLabelLHSType = new JLabel("LHS Type");
JLabel mLabelRHSType = new JLabel("RHS Type");
JButton mButtonDelete = new JButton("Delete");
JButton mButtonInsert = new JButton("Insert");
JPanel mPanelButton = new JPanel();
JPanel mPanelScroll = new JPanel();
JPanel mPanelCombo = new JPanel();
DefaultTableModel dm ;
JTable table;
int currentRow = -1;
static int mSelectedRow = -1;
public JButtonTableExample()
super( "JButtonTable Example" );
makeForm();
setSize( 410, 222 );
setVisible(true);
private void makeForm()
this.getContentPane().setLayout(null);
mPanelCombo.setLayout(null);
mPanelCombo.setBorder(new LineBorder(Color.red));
mPanelCombo.setBounds(new Rectangle(1,1,400,30));
mLabelLHSType.setBounds(new Rectangle(26,5,71,22));
mComboLHSType.setBounds(new Rectangle(83,5,100,22));
mLabelRHSType.setBounds(new Rectangle(232,5,71,22));
mComboRHSType.setBounds(new Rectangle(292,5,100,22));
mPanelCombo.add(mLabelLHSType,null);
mPanelCombo.add(mComboLHSType,null);
mPanelCombo.add(mLabelRHSType,null);
mPanelCombo.add(mComboRHSType,null);
mPanelScroll.setLayout(null);
mPanelScroll.setBorder(new LineBorder(Color.blue));
mPanelScroll.setBounds(new Rectangle(1,28,400,135));
mPanelButton.setLayout(null);
mPanelButton.setBorder(new LineBorder(Color.green));
mPanelButton.setBounds(new Rectangle(1,165,400,30));
mButtonInsert.setBounds(new Rectangle(120,5,71,22));
mButtonDelete.setBounds(new Rectangle(202,5,71,22));
mButtonDelete.addActionListener(this);
mButtonInsert.addActionListener(this);
mPanelButton.add(mButtonDelete,null);
mPanelButton.add(mButtonInsert,null);
dm = new DefaultTableModel();
//dm.setDataVector(null,
//new Object[]{"Button","Join","LHS","Operator","RHS"});
dm.setDataVector(new Object[][]{{"","","","",""}},
new Object[]{"","Join","LHS","Operator","RHS"});
table = new JTable(dm);
table.getTableHeader().setReorderingAllowed(false);
table.setRowHeight(25);
int columnWidth[] = {20,45,95,95,95};
TableColumnModel modelCol = table.getColumnModel();
for (int i=0;i<5;i++)
modelCol.getColumn(i).setPreferredWidth(columnWidth);
//modelCol.getColumn(0).setCellRenderer(new ButtonRenderer());
//modelCol.getColumn(0).setCellEditor(new ButtonEditor(new JCheckBox()));
modelCol.getColumn(0).setCellRenderer(new ButtonCR());
modelCol.getColumn(0).setCellEditor(new ButtonCE(new JCheckBox()));
modelCol.getColumn(0).setResizable(false);
setUpJoinColumn(modelCol.getColumn(1));
setUpLHSColumn(modelCol.getColumn(2));
setUpOperColumn(modelCol.getColumn(3));
setUpRHSColumn(modelCol.getColumn(4));
JScrollPane scroll = new JScrollPane(table);
scroll.setBounds(new Rectangle(1,1,400,133));
mPanelScroll.add(scroll,null);
this.getContentPane().add(mPanelCombo,null);
this.getContentPane().add(mPanelScroll,null);
this.getContentPane().add(mPanelButton,null);
}//end of makeForm()
public void actionPerformed(ActionEvent ae)
if (ae.getSource() == mButtonInsert)
//int currentRow = table.getSelectedRow();
currentRow = ButtonCE.selectedRow;
System.out.println("Before Insert CURRENT ROW"+currentRow);
if(currentRow == -1)
int rowCount = dm.getRowCount();
//mSelectedRow = rowCount-1;
//table.clearSelection();
dm.insertRow(rowCount,new Object[]{"","","","",""});
currentRow = -1;
ButtonCE.selectedRow = -1;
else
table.clearSelection();
dm.insertRow(currentRow+1,new Object[]{"","","","",""});
currentRow = -1;
ButtonCE.selectedRow = -1;
//System.out.println("After INSERT CURRENT ROW"+currentRow);
if(ae.getSource() == mButtonDelete)
//int currentRow = table.getSelectedRow();
currentRow = ButtonCE.selectedRow;
System.out.println("Before DELETE CURRENT ROW"+currentRow);
if(currentRow != -1)
dm.removeRow(currentRow);
table.clearSelection();
currentRow = -1;
ButtonCE.selectedRow = -1;
//System.out.println("Selected Row"+mSelectedRow);
else
JOptionPane.showMessageDialog(null, "Select row first", "alert", JOptionPane.ERROR_MESSAGE);
//System.out.println("DELETE CURRENT ROW"+currentRow);
public void setUpJoinColumn(TableColumn joinColumn)
//Set up the editor for the sport cells.
JComboBox comboBox = new JComboBox();
comboBox.addItem("AND");
comboBox.addItem("OR");
comboBox.addItem("NOT");
joinColumn.setCellEditor(new DefaultCellEditor(comboBox));
//Set up tool tips for the sport cells.
DefaultTableCellRenderer renderer =
new DefaultTableCellRenderer();
renderer.setToolTipText("Click for combo box");
joinColumn.setCellRenderer(renderer);
//Set up tool tip for the sport column header.
TableCellRenderer headerRenderer = joinColumn.getHeaderRenderer();
if (headerRenderer instanceof DefaultTableCellRenderer) {
((DefaultTableCellRenderer)headerRenderer).setToolTipText(
"Click the sport to see a list of choices");
public void setUpLHSColumn(TableColumn LHSColumn)
//Set up the editor for the sport cells.
JComboBox comboBox = new JComboBox();
comboBox.addItem("Participant1");
comboBox.addItem("Participant2");
comboBox.addItem("Variable1");
LHSColumn.setCellEditor(new DefaultCellEditor(comboBox));
//Set up tool tips for the sport cells.
DefaultTableCellRenderer renderer =
new DefaultTableCellRenderer();
renderer.setToolTipText("Click for combo box");
LHSColumn.setCellRenderer(renderer);
//Set up tool tip for the sport column header.
TableCellRenderer headerRenderer = LHSColumn.getHeaderRenderer();
if (headerRenderer instanceof DefaultTableCellRenderer) {
((DefaultTableCellRenderer)headerRenderer).setToolTipText(
"Click the sport to see a list of choices");
public void setUpOperColumn(TableColumn operColumn)
//Set up the editor for the sport cells.
JComboBox comboBox = new JComboBox();
comboBox.addItem("=");
comboBox.addItem("!=");
comboBox.addItem("Contains");
operColumn.setCellEditor(new DefaultCellEditor(comboBox));
//Set up tool tips for the sport cells.
DefaultTableCellRenderer renderer =
new DefaultTableCellRenderer();
renderer.setToolTipText("Click for combo box");
operColumn.setCellRenderer(renderer);
//Set up tool tip for the sport column header.
TableCellRenderer headerRenderer = operColumn.getHeaderRenderer();
if (headerRenderer instanceof DefaultTableCellRenderer) {
((DefaultTableCellRenderer)headerRenderer).setToolTipText(
"Click the sport to see a list of choices");
public void setUpRHSColumn(TableColumn rhsColumn)
//Set up the editor for the sport cells.
JComboBox comboBox = new JComboBox();
comboBox.addItem("Variable1");
comboBox.addItem("Constant1");
comboBox.addItem("Constant2");
rhsColumn.setCellEditor(new DefaultCellEditor(comboBox));
//Set up tool tips for the sport cells.
DefaultTableCellRenderer renderer =
new DefaultTableCellRenderer();
renderer.setToolTipText("Click for combo box");
rhsColumn.setCellRenderer(renderer);
//Set up tool tip for the sport column header.
TableCellRenderer headerRenderer = rhsColumn.getHeaderRenderer();
if (headerRenderer instanceof DefaultTableCellRenderer) {
((DefaultTableCellRenderer)headerRenderer).setToolTipText(
"Click the sport to see a list of choices");
public static void main(String[] args) {
JButtonTableExample frame = new JButtonTableExample();
frame.addWindowListener(new WindowAdapter() {
public void windowClosing(WindowEvent e) {
System.exit(0);
//Button as a renderer for the table cells
class ButtonCR implements TableCellRenderer
JButton btnSelect;
public ButtonCR()
btnSelect = new JButton();
btnSelect.setMargin(new Insets(0,0,0,0));
public Component getTableCellRendererComponent(JTable table,Object value,boolean isSelected,boolean hasFocus,int row,int column)
if (column != 0) return null; //meany !!!
//System.out.println("Inside renderer########################Selected row");
//btnSelect.setText(value.toString());
//btnSelect.setIcon(new ImageIcon("capsigma.gif"));
return btnSelect;
}//end fo ButtonCR
//Default Editor for table
class ButtonCE extends DefaultCellEditor implements ActionListener
JButton btnSelect;
JTable table;
//Object val;
static int selectedRow = -1;
public ButtonCE(JCheckBox whoCares)
super(whoCares);
//this.row = row;
btnSelect = new JButton();
btnSelect.setMargin(new Insets(0,0,0,0));
btnSelect.addActionListener(this);
setClickCountToStart(1);
public Component getTableCellEditorComponent(JTable table,Object value,boolean isSelected,int row,int column)
if (column != 0) return null; //meany !!!
this.selectedRow = row;
this.table = table;
table.clearSelection();
System.out.println("Inside getTableCellEditorComponent");
return btnSelect;
//public Object getCellEditorValue()
//return val;
public void actionPerformed(ActionEvent e)
// Your Code Here...
System.out.println("Inside actionPerformed");
System.out.println("Action performed Row selected "+selectedRow);
btnSelect.setIcon(new ImageIcon("capsigma.gif"));
}//end of ButtonCE

Hi,
All the thing you have to do is to return a boolean for the column. JTable will use a checkbox (as default) to show boolean values.

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Help me please!
A try to remove column from JTable. It's removed, but when I try to add column in table, then I get all old (removed early) columns + new column....
I completely confused with it.....
Here is my code for remove column:
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My brain is boiled, I've try a lot of variants of code, but did't get right result :((
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I understand, that my code just hide columns, not delete from table model....
But now I have not any decision of my problem...
Thanks a lot for any help. :)
import javax.swing.*;
import java.awt.*;
import javax.swing.table.*;
import java.awt.event.*;
import javax.swing.table.DefaultTableModel;
class JTableF extends JFrame
     Object [] [] data = new Object [0] [2];
     JTable table;
     DefaultTableModel model;
     String [] columnNames = {"1", "2"};
     TableColumnModel cm;
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          menu1 [ 3 ].addActionListener(new DelC());
          for (int i=0; i<menu1.length; i++)
               menus [ 0 ].add( menu1 [ i ]);
          for (int i=0; i<menus.length; i++)
               MBar.add(menus );
          JPanel panel = new JPanel ();
          model = new DefaultTableModel( data, columnNames );
          table = new JTable (model);
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          JButton b = new JButton ("Add row button");
          b.addActionListener(new AddL());
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          setJMenuBar (MBar);
          getContentPane().add(panel);
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                    TableColumnModel tableCModel = table.getColumnModel();
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     class AddC implements ActionListener
          public void actionPerformed (ActionEvent e)
               //table.setColumnModel(cm);
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               NewColumnName = JOptionPane.showInputDialog ("Input new column name", "Here");
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Hello I am new To JAVA SWING
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Please find the code snippets at this URL. Thanks for your time...
http://forum.java.sun.com/thread.jsp?forum=31&thread=459736&start=15&range=15&hilite=false&q=

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return true;
} catch (UnsupportedFlavorException ufe) {
} catch (IOException ioe) {
return false;
protected void exportDone(JComponent c, Transferable data, int action) {
cleanup(c, action == MOVE);
public boolean canImport(JComponent c, DataFlavor[] flavors) {
for (int i = 0; i < flavors.length; i++) {
if (DataFlavor.stringFlavor.equals(flavors[i])) {
return true;
return false;

Hide row in Jtable

Please I need help
How can I hide a row in Jtable.
For example if you push a button hide first row.
Thanks

One simple way you can do is:
just remove this row but keep it somewhere so that you may add it back when you want later. :-)

Delete rows from JTable

Hello
I use a JTable with a custom table model that extends javax.swing.table.DefaultTableModel.
I haven't overwrote the method
public void removeRow(int row)Now when i use this method the rows always get removed from the end. It doesn't matter which value the parameter row has.
Even when i call
myTableModel.removeRow( 0 );it removes the rows at the end of the table.
It would be nice if someone could help me with this.
Regards, Michelle

It's not so easy to do this because it's a big project, but here is the code of the table model.
import javax.swing.table.*;
import javax.swing.event.TableModelEvent;
import javax.swing.event.TableModelListener;
import java.util.*;
public class AssignmentsTableModel2 extends DefaultTableModel implements TableModelListener
     static final long serialVersionUID = 41L;
     public AssignmentsTableModel2(String[][] arg1, String[] arg2)
          super(arg1, arg2);
     public Vector getColumnIdentifiers()
          return columnIdentifiers;
     @Override
     public int getColumnCount()
          return this.columnIdentifiers.size();
     @Override
     public int getRowCount()
          return this.dataVector.size();
     @Override
     public String getColumnName(int col)
        return (String)this.columnIdentifiers.elementAt( col );
     @Override
     public Object getValueAt(int rowIndex, int columnIndex)
          return ((Vector)this.dataVector.elementAt( rowIndex )).elementAt( columnIndex );
     @Override
     public void setValueAt( Object val, int rowIndex, int columnIndex )
          ((Vector)this.dataVector.elementAt( rowIndex )).set( columnIndex, val);
          fireTableCellUpdated( rowIndex, columnIndex );
     @Override
     public void tableChanged(TableModelEvent e)
     @Override
     public void setColumnIdentifiers(Vector columnIdentifiers)
          super.setColumnIdentifiers(columnIdentifiers);
     @Override
     public void removeRow(int row)
          this.dataVector.remove(row);
          System.out.println(row + " to remove");
          this.fireTableStructureChanged();
          //super.removeRow(row);
}I need the model to change the background color of the cells at runtime and I now overwrote the removeRow() method, but it's still the same problem.
Also I have a custom JTable class that colours the TableHeader of the selected column.
class PaintedTable extends JTable {
    private static final long serialVersionUID = 1L;
    PaintedTable(AssignmentsTableModel2 atm)
        super(atm);
        setOpaque(false);
        ((JComponent) getDefaultRenderer(Object.class)).setOpaque(false);
    @Override
    public void paintComponent(Graphics g)
         //System.out.println("paint table");
        Color background = new Color(168, 210, 241);
        Color controlColor = new Color(230, 240, 230);
        int width = getWidth();
        int height = getHeight();
        Graphics2D g2 = (Graphics2D) g;
        Paint oldPaint = g2.getPaint();
        g2.setPaint(new GradientPaint(0, 0, background, width, 0, controlColor));
        g2.fillRect(0, 0, width, height);
        g2.setPaint(oldPaint);
        for (int row : getSelectedRows())
            Rectangle start = getCellRect(row, 0, true);
            Rectangle end = getCellRect(row, getColumnCount() - 1, true);
            g2.setPaint(new GradientPaint(start.x, 0, Color.orange, (int) ((end.x + end.width - start.x) * 1.25), 0, controlColor));
            g2.fillRect(start.x, start.y, end.x + end.width - start.x, start.height);
            //System.out.println("rect: (" + start.x + ", " + start.y + ") + (" + (end.x + end.width - start.x) + ", " + start.height +")");
        super.paintComponent(g);
    public boolean isCellEditable(int rowIndex, int colIndex)
        return false;
AssignmentsTableModel2 atm = new AssignmentsTableModel2(this.columnValues, this.columnHeaders);
PaintedTable table = new PaintedTable( this.atm );

Making a few rows in jTable uneditable

Hi
I have a simple problem :)
1) i send some data, read from jTable, to sever and wait for reply
2) i recieve data from server.. have to put that data to jtable in a specific column
3) now i have to make the whole row in jtable uneditable
1) and 2) are done
i need help with only 3)
Thanks

ok
Create a separate class in your netbeans project, this is the minimum requirements:
import javax.swing.table.DefaultTableModel;
import java.util.Vector;
public class MyTableModel extends DefaultTableModel{
     private Vector<Integer> uneditableIndices;
     public MyTableModel()
        uneditableIndices = new Vector<Integer>();
     public boolean isCellEditable(int row, int column)
          for (int index : uneditableIndices)
               if (row == index)
                    return false;
          return true;
     public void addUneditableRowIndex(int rowIndex)
          uneditableIndices.add(rowIndex);
     public int removeUneditableRowIndex(int rowIndex)
          uneditableIndices.remove(rowIndex);
}I did not check the previous code, so it needs to be checked.
In the Table Properties window select the previous class to be the default model for your table.
then you can handle adding new indexes to the indexes vector while run-time.
PLEASE FEED ME BACK.
Good Luck.
Ahmad Elsafty

Delete Multiple Rows of JTable by selecting JCheckboxes

Hi,
I want delete rows of JTable that i select through JCheckbox on clicking on JButton. The code that i am using is deleting one row at a time. I want to delete multiple rows at a time on clicking on Button.
This is the code i m using
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import javax.swing.table.*;
public class TableTest extends JFrame implements ActionListener
     JButton btnAdd;
     BorderLayout layout;
     DefaultTableModel model;
     JTable table;JButton btexcluir;
     public static void main(String[] args)
          TableTest app = new TableTest();
          app.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
     public TableTest()
          super("Table Example");
          btnAdd = new JButton("Add");
          btnAdd.addActionListener(this);
          model = new DefaultTableModel()
               public Class getColumnClass(int col)
                    switch (col)
                         case 1 :
                              return Boolean.class;
                         default :
                              return Object.class;
          table = new JTable(model);
          table.setPreferredSize(new Dimension(250,200));
          // Create a couple of columns
          model.addColumn("Col1");
          model.addColumn("Col2");
          JCheckBox cbox = new JCheckBox();
          // Append a row
          JPanel painel = new JPanel();
          model.addRow(new Object[] { "v1",new Boolean(false)});
          model.addRow(new Object[] { "v3", new Boolean(false)});
          JScrollPane scrollPane = new JScrollPane(table);
          scrollPane.createVerticalScrollBar();
          btexcluir= new JButton("Excluir");
          btexcluir.addActionListener(this);
          painel.add(btexcluir);
          painel.add(btnAdd);
          getContentPane().add(scrollPane, BorderLayout.NORTH);
          getContentPane().add(painel, BorderLayout.SOUTH);
          setSize(600, 600);
          setVisible(true);
     public void actionPerformed(ActionEvent e)     {
       if (e.getSource() == btnAdd)
          model.addRow(new Object[] { "Karl", new Boolean(false)});
       if (e.getSource()==btexcluir){
            for (int i=0; i <=model.getRowCount(); i++){
                 if (model.getValueAt(i,1)==Boolean.FALSE)
                      JOptionPane.showMessageDialog(null, "No lines to remove!!");
                 else if(model.getValueAt(i,1)==Boolean.TRUE)
                      model.removeRow(i);
}Please reply me with code help.
Thanks
Nitin

Hi,
Thanks for ur support. My that problem is solved now. One more problem now . Initially i want that delete button disabled. When i select any checkbox that button should get enabled. how can i do that ?
Thanks
Nitin

Removing Rows in JTable

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