JTable - Rows and columns

I have created a JTable that displays the results from a query. My question is how can I get the JTable to display only a given number of rows and columns and have a scrollbar to see the rest of the cells?
Thank you

an easy way would be to use setSize()

Similar Messages

Retreiving Point location with JTable row and column

If I have the row and column in a JTable (in a JPanel), how do I get the Point location offset from the location Point of the JTable or JPanel ?

I think that this may do it.
Point objPoint = new Point( objTable_.getLocation() );
int intRow = objTable_.getSelectedRow();
int intColumn = objTable_.getSelectedColumn();
int intColumnWidth = objTable_.getColumnModel().getColumn( intColumn ).getWidth();
int intColumnMargin = objTable_.getColumnModel().getColumnMargin();
int x = (int) objPoint.getX() + ( (intColumn+1) * intColumnWidth) );
// perhaps * (intColumnWidth + intColumnMargin)
int y = (int) objPoint.getY() + ( (intRow+1) * objTable_.getRowHeight());
// perhaps * (objTable_.getRowHeight() + objTable_.getRowMargin())

Mapping of JTable Rows and columns and paint it to the JPanel

Hi,
I am using JTable and graphics object to draw the JTable on JPanel. But due to some lack of measurement I am not able to draw table cells correctly.
Apart from this on changing the fontSize I have to redraw it according to the requirement. But when the data size increases it draws absurdly.
I am using jTable.getCellRect() api to get the row width and height. Please help to redraw a JTable cell row and height on JPanel.
I am also attaching a sample code with this mail.
Thanks,
Ajay
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.JTable;
import javax.swing.*;
import java.awt.Dimension;
import java.awt.GridLayout;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;
import javax.swing.table.*;
import java.util.*;
import java.awt.*;
public class SimpleTableDemo extends JPanel {
    private boolean DEBUG = false;
       private int spacing = 6;
       private Map columnSizes = new HashMap();
       String[] columnNames = {"First Name",
                                "Last Name",
                                "Sport",
                                "# of Years",
                                "Vegetarian"};
        Object[][] data = {
         {"Kathy", "Smith",
          "SnowboardingXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX", new Integer(5), new Boolean(false)},
         {"John", "Doe",
          "Rowing", new Integer(3), new Boolean(true)},
         {"Sue", "Black",
          "Knitting", new Integer(2), new Boolean(false)},
         {"Jane", "White",
          "Speed reading", new Integer(20), new Boolean(true)},
         {"Joe", "Brown",
          "Pool", new Integer(10), new Boolean(false)}
        final JTable table = new JTable(data, columnNames);
          Panel1 panel;
    public SimpleTableDemo() {
        super(new GridLayout(3,0));
        table.setPreferredScrollableViewportSize(new Dimension(500, 70));
        //table.setFillsViewportHeight(true);
        if (DEBUG) {
            table.addMouseListener(new MouseAdapter() {
                public void mouseClicked(MouseEvent e) {
                    printDebugData(table);
        //Create the scroll pane and add the table to it.
        JScrollPane scrollPane = new JScrollPane(table);
        //Add the scroll pane to this panel.
        add(scrollPane);
        panel = new Panel1();
        Rectangle rect = table.getCellRect(0,0,true);
          panel.setX(table.getWidth());
          panel.setY(0);
        panel.setWidth(rect.width);
          panel.setHeight(rect.height);
        panel.setStr(table.getModel().getValueAt(0,0).toString());
          panel.setModel(table);
          add(panel);
        final JComboBox jNumberComboBoxSize = new JComboBox();
          jNumberComboBoxSize.setModel(new javax.swing.DefaultComboBoxModel(new String[] { "11", "12", "14", "16", "18", "20", "24", "30", "36", "48", "72" }));
        jNumberComboBoxSize.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
               jNumberComboBoxSizeActionPerformed(jNumberComboBoxSize);
          JPanel panel2 = new JPanel();
          panel2.add(jNumberComboBoxSize);
          add(panel2);
          adjustColumns();
     private void jNumberComboBoxSizeActionPerformed(JComboBox jNumberComboBoxSize)
        int fontSize = Integer.parseInt(jNumberComboBoxSize.getSelectedItem().toString());
          table.setRowHeight(fontSize);
          table.setFont(new Font("Serif", Font.BOLD, fontSize));
          Rectangle rect = table.getCellRect(0,0,true);
          panel.setX(0);
          panel.setY(0);
       // panel.setWidth(rect.width);
          panel.setHeight(rect.height);
        panel.setStr(table.getModel().getValueAt(0,0).toString());
          panel.setModel(table);
          panel.repaint();
          table.revalidate();
    private void printDebugData(JTable table) {
        int numRows = table.getRowCount();
        int numCols = table.getColumnCount();
        javax.swing.table.TableModel model = table.getModel();
        System.out.println("Value of data: ");
        for (int i=0; i < numRows; i++) {
            System.out.print("    row " + i + ":");
            for (int j=0; j < numCols; j++) {
                System.out.print(" " + model.getValueAt(i, j));
            System.out.println();
        System.out.println("--------------------------");
      * Adjust the widths of all the columns in the table
     public void adjustColumns()
          TableColumnModel tcm = table.getColumnModel();
          for (int i = 0; i < tcm.getColumnCount(); i++)
               adjustColumn(i);
      * Adjust the width of the specified column in the table
     public void adjustColumn(final int column)
          TableColumn tableColumn = table.getColumnModel().getColumn(column);
          if (! tableColumn.getResizable()) return;
          int columnHeaderWidth = getColumnHeaderWidth( column );
          int columnDataWidth   = getColumnDataWidth( column );
          int preferredWidth    = Math.max(columnHeaderWidth, columnDataWidth);
        panel.setWidth(preferredWidth);
          updateTableColumn(column, preferredWidth);
      * Calculated the width based on the column name
     private int getColumnHeaderWidth(int column)
          TableColumn tableColumn = table.getColumnModel().getColumn(column);
          Object value = tableColumn.getHeaderValue();
          TableCellRenderer renderer = tableColumn.getHeaderRenderer();
          if (renderer == null)
               renderer = table.getTableHeader().getDefaultRenderer();
          Component c = renderer.getTableCellRendererComponent(table, value, false, false, -1, column);
          return c.getPreferredSize().width;
      * Calculate the width based on the widest cell renderer for the
      * given column.
     private int getColumnDataWidth(int column)
          int preferredWidth = 0;
          int maxWidth = table.getColumnModel().getColumn(column).getMaxWidth();
          for (int row = 0; row < table.getRowCount(); row++)
              preferredWidth = Math.max(preferredWidth, getCellDataWidth(row, column));
               // We've exceeded the maximum width, no need to check other rows
               if (preferredWidth >= maxWidth)
                   break;
          return preferredWidth;
      * Get the preferred width for the specified cell
     private int getCellDataWidth(int row, int column)
          // Inovke the renderer for the cell to calculate the preferred width
          TableCellRenderer cellRenderer = table.getCellRenderer(row, column);
          Component c = table.prepareRenderer(cellRenderer, row, column);
          int width = c.getPreferredSize().width + table.getIntercellSpacing().width;
          return width;
      * Update the TableColumn with the newly calculated width
     private void updateTableColumn(int column, int width)
          final TableColumn tableColumn = table.getColumnModel().getColumn(column);
          if (! tableColumn.getResizable()) return;
          width += spacing;
          // Don't shrink the column width
          width = Math.max(width, tableColumn.getPreferredWidth());
          columnSizes.put(tableColumn, new Integer(tableColumn.getWidth()));
          table.getTableHeader().setResizingColumn(tableColumn);
          tableColumn.setWidth(width);
     * 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("SimpleTableDemo");
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        //Create and set up the content pane.
        SimpleTableDemo newContentPane = new SimpleTableDemo();
        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();
class Panel1 extends JPanel
    int x;
     int y;
     int width;
     int height;
     String str;
     JTable model;
    public void setModel(JTable model)
       this.model = model;
     public void setX(int x)
          this.x = x;
    public void setY(int y)
          this.y = y;
     public void setWidth(int w)
          this.width = w;
    public void setHeight(int h)
          this.height = h;
     public void setStr(String s)
          this.str = s;
    public void paint(Graphics g)
         super.paint(g);
          int initX= 0;
          for(int row=0;row < 5; ++row)
               initX = x;
               for (int col=0;col < 5;++col)
                    g.drawRect(x,y,width,height);
                    g.drawString(model.getModel().getValueAt(row,col).toString(),x + 10,y + 10);
                    x = x + width;
            x = initX;
               y = y + height;
};

an easy way would be to use setSize()

Remove JTable row and column in one event

Hello,
I 've using matrix table in one application.
i need to remove both column and row in single event.
For this i construct
JTable(data[][], header[]);
because dynamically increase data's and header's
What can i do for this?

Create a method that does:
DefaultTableModel model = (DefaultTableModel)table.getModel();
model.removeRow(...)
model.setRowCount(...)
Read the DefaultTableModel API for more information.

How to set the Selected row and Column in JTable

Hi,
i have a problem like the JTable having one Method getSelectedRow() and getSelectedColumn to know the Selected row and Column but if i want to explicitly set the Selected Row and Column,then there is no such type of Methods.If anybody has any solution then i will be thankful to him/her.
Praveen K Saxena

Is that what you're looking for? :myTable.getSelectionModel().setSelectionInterval(row, row);
myTable.getColumnModel().getSelectionModel().setSelectionInterval(column, column);

JTable fixed Row and Column in the same window

Hi
Could anyone tip me how to make fixed row and column in the same table(s).
I know how to make column fixed and row, tried to combine them but it didnt look pretty.
Can anyone give me a tip?
Thanks! :)

Got it to work!
heres the kod.. nothing beautiful, didnt clean it up.
* NewClass.java
* Created on den 29 november 2007, 12:51
* To change this template, choose Tools | Template Manager
* and open the template in the editor.
package tablevectortest;
* @author Sockan
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import javax.swing.table.*;
import javax.swing.event.*;
public class FixedRowCol extends JFrame {
Object[][] data;
Object[] column;
JTable fixedTable,table,fixedColTable,fixedTopmodelTable;
private int FIXED_NUM = 16;
public FixedRowCol() {
    super( "Fixed Row Example" );
    data = new Object[][]{
        {      "","A","A","A","",""},
        {      "a","b","","","",""},
        {      "a","","c","","",""},
        {      "","","","d","",""},
        {      "","","","","e",""},
        {      "","","","","","f"},
        {      "","b","","","",""},
        {      "","","c","","",""},
        {      "","","","d","",""},
        {      "","","","","e",""},
        {      "","b","","","",""},
        {      "","","c","","",""},
        {      "","","","d","",""},
        {      "","","","","e",""},
        {      "","","","","","f"},
        {      "I","","W","G","A",""}};
    column = new Object[]{"A","B","C","D","E","F"};
    AbstractTableModel fixedColModel = new AbstractTableModel() {
      public int getColumnCount() {
        return 1;
      public int getRowCount() {
        return data.length;
      public String getColumnName(int col) {
        return (String) column[col];
      public Object getValueAt(int row, int col) {
        return data[row][col];
      public boolean CellEditable(int row, int col) {
        return true;
    AbstractTableModel    model = new AbstractTableModel() {
      public int getColumnCount() { return column.length-2; }
      public int getRowCount() { return data.length - FIXED_NUM; }
      public String getColumnName(int col) {
       return (String)column[col+1];
      public Object getValueAt(int row, int col) {
        return data[row][col+1];
      public void setValueAt(Object obj, int row, int col) {
        data[row][col+1] = obj;
      public boolean CellEditable(int row, int col) {
        return true;
    AbstractTableModel fixedTopModel = new AbstractTableModel() {
      public int getColumnCount() { return 1; }
      public int getRowCount() { return data.length - FIXED_NUM; }
      public String getColumnName(int col) {
       return (String)column[col];
      public Object getValueAt(int row, int col) {
        return data[row][col];
      public void setValueAt(Object obj, int row, int col) {
        data[row][col] = obj;
      public boolean CellEditable(int row, int col) {
        return true;
    AbstractTableModel fixedModel = new AbstractTableModel() {
      public int getColumnCount() { return column.length-2; }
      public int getRowCount() { return FIXED_NUM; }
      public Object getValueAt(int row, int col) {
        return data[row + (data.length - FIXED_NUM)][col+1];
    table = new JTable( model );
    table.setAutoResizeMode(JTable.AUTO_RESIZE_OFF);
    table.setSelectionMode(ListSelectionModel.SINGLE_SELECTION);
    fixedTable = new JTable( fixedModel );
    fixedTable.setAutoResizeMode(JTable.AUTO_RESIZE_OFF);
    fixedTable.setSelectionMode(ListSelectionModel.SINGLE_SELECTION);
    fixedColTable= new JTable(fixedColModel);
    fixedColTable.setAutoResizeMode(JTable.AUTO_RESIZE_OFF);
    fixedColTable.setSelectionMode(ListSelectionModel.SINGLE_SELECTION);
    fixedTopmodelTable = new JTable(fixedTopModel);
    fixedTopmodelTable.setAutoResizeMode(JTable.AUTO_RESIZE_OFF);
    fixedTopmodelTable.setSelectionMode(ListSelectionModel.SINGLE_SELECTION);
    JScrollPane scroll      = new JScrollPane( table );
     scroll.setHorizontalScrollBarPolicy(JScrollPane.HORIZONTAL_SCROLLBAR_NEVER);
     scroll.setVerticalScrollBarPolicy(JScrollPane.VERTICAL_SCROLLBAR_ALWAYS);
    JScrollPane fixedScroll = new JScrollPane( fixedTable ) {
      public void setColumnHeaderView(Component view) {}
    fixedScroll.setVerticalScrollBarPolicy(JScrollPane.VERTICAL_SCROLLBAR_ALWAYS);
    fixedScroll.setHorizontalScrollBarPolicy(JScrollPane.HORIZONTAL_SCROLLBAR_ALWAYS);
    JScrollBar bar = scroll.getVerticalScrollBar();
    JScrollBar dummyBar = new JScrollBar() {
      public void paint(Graphics g) {}
    dummyBar.setPreferredSize(bar.getPreferredSize());
    scroll.setVerticalScrollBar(dummyBar);
    final JScrollBar bar1 = scroll.getHorizontalScrollBar();
    JScrollBar bar2 = fixedScroll.getHorizontalScrollBar();
    bar2.addAdjustmentListener(new AdjustmentListener() {
      public void adjustmentValueChanged(AdjustmentEvent e) {
        bar1.setValue(e.getValue());
    JViewport viewport = new JViewport();
    viewport.setView(fixedColTable);
    viewport.setPreferredSize(fixedColTable.getPreferredSize());
    fixedScroll.setRowHeaderView(viewport);
    fixedScroll.setCorner(JScrollPane.UPPER_LEFT_CORNER, fixedColTable
        .getTableHeader());
    JViewport viewport2 = new JViewport();
    viewport2.setView(fixedTopmodelTable);
    viewport2.setPreferredSize(fixedTopmodelTable.getPreferredSize());
    scroll.setRowHeaderView(viewport2);
    scroll.setCorner(JScrollPane.UPPER_LEFT_CORNER, fixedTopmodelTable
        .getTableHeader());
    scroll.setPreferredSize(new Dimension(600, 19));
    fixedScroll.setPreferredSize(new Dimension(600, 100));
    getContentPane().add(     scroll, BorderLayout.NORTH);
    getContentPane().add(fixedScroll, BorderLayout.CENTER);
public static void main(String[] args) {
    FixedRowCol frame = new FixedRowCol();
    frame.addWindowListener( new WindowAdapter() {
      public void windowClosing( WindowEvent e ) {
        System.exit(0);
    frame.pack();
    frame.setVisible(true);
}

How to freeze row and column in JTable

Hi,
I need to freeze first two rows and columns in a large JTable. I found ways to freeze either a row or a column, but not both at the same time.
Can any of you help ?
Found this code which allows freezing a col. Similar method can be used to freeze column
import javax.swing.JScrollPane;
import javax.swing.JTable;
import javax.swing.JViewport;
import javax.swing.table.DefaultTableModel;
import javax.swing.table.JTableHeader;
import javax.swing.table.TableModel;
public class FrozenTablePane extends JScrollPane{
public FrozenTablePane(JTable table, int colsToFreeze){
super(table);
TableModel model = table.getModel();
//create a frozen model
TableModel frozenModel = new DefaultTableModel(
model.getRowCount(),
colsToFreeze);
//populate the frozen model
for (int i = 0; i < model.getRowCount(); i++) {
for (int j = 0; j < colsToFreeze; j++) {
String value = (String) model.getValueAt(i, j);
frozenModel.setValueAt(value, i, j);
//create frozen table
JTable frozenTable = new JTable(frozenModel);
//remove the frozen columns from the original table
for (int j = 0; j < colsToFreeze; j++) {
table.removeColumn(table.getColumnModel().getColumn(0));
table.setAutoResizeMode(JTable.AUTO_RESIZE_OFF);
//format the frozen table
JTableHeader header = table.getTableHeader();
frozenTable.setBackground(header.getBackground());
frozenTable.setAutoResizeMode(JTable.AUTO_RESIZE_OFF);
frozenTable.setEnabled(false);
//set frozen table as row header view
JViewport viewport = new JViewport();
viewport.setView(frozenTable);
viewport.setPreferredSize(frozenTable.getPreferredSize());
setRowHeaderView(viewport);
setCorner(JScrollPane.UPPER_LEFT_CORNER, frozenTable.getTableHeader());
}

Hi,
I need to freeze first two rows and columns in a large JTable. I found ways to freeze either a row or a column, but not both at the same time.
Can any of you help ?
Found this code which allows freezing a col. Similar method can be used to freeze column
import javax.swing.JScrollPane;
import javax.swing.JTable;
import javax.swing.JViewport;
import javax.swing.table.DefaultTableModel;
import javax.swing.table.JTableHeader;
import javax.swing.table.TableModel;
public class FrozenTablePane extends JScrollPane{
public FrozenTablePane(JTable table, int colsToFreeze){
super(table);
TableModel model = table.getModel();
//create a frozen model
TableModel frozenModel = new DefaultTableModel(
model.getRowCount(),
colsToFreeze);
//populate the frozen model
for (int i = 0; i < model.getRowCount(); i++) {
for (int j = 0; j < colsToFreeze; j++) {
String value = (String) model.getValueAt(i, j);
frozenModel.setValueAt(value, i, j);
//create frozen table
JTable frozenTable = new JTable(frozenModel);
//remove the frozen columns from the original table
for (int j = 0; j < colsToFreeze; j++) {
table.removeColumn(table.getColumnModel().getColumn(0));
table.setAutoResizeMode(JTable.AUTO_RESIZE_OFF);
//format the frozen table
JTableHeader header = table.getTableHeader();
frozenTable.setBackground(header.getBackground());
frozenTable.setAutoResizeMode(JTable.AUTO_RESIZE_OFF);
frozenTable.setEnabled(false);
//set frozen table as row header view
JViewport viewport = new JViewport();
viewport.setView(frozenTable);
viewport.setPreferredSize(frozenTable.getPreferredSize());
setRowHeaderView(viewport);
setCorner(JScrollPane.UPPER_LEFT_CORNER, frozenTable.getTableHeader());
}

Select row and column from header in jtable

hello i have a problem to select row and column from header in jtable..
can somebody give me an idea on how to write the program on it.

Hi Vicky Liu,
Thank you for your reply. I'm sorry for not clear question.
Answer for your question:
1. First value of Open is item fiels in Dataset2 and this value only for first month (january). But for other month Open value get from Close in previous month.
* I have 2 Dataset , Dataset1 is all data for show in my report. Dataset2 is only first Open for first month
2. the picture for detail of my report
Detail for Red number:
1. tb_Open -> tb_Close in previous month but first month from item field in Dataset2
espression =FormatNumber(Code.GetOpening(Fields!month.Value,First(Fields!open.Value, "Dataset2")))
2. tb_TOTAL1 group on item_part = 1
expression =FormatNumber(Sum(CDbl(Fields!budget.Value)))
3. tb_TOTAL2 group on item_part = 3 or item_part = 4
expression =FormatNumber(Sum(CDbl(Fields!budget.Value)) + ReportItems!tb_TOTAL1.Value )
4. tb_TOTAL3 group on item_part = 2
expression =FormatNumber(Sum(CDbl(Fields!budget.Value)) - ReportItems!tb_TOTAL2 .Value)
5. tb_Close -> calculate from tb_TOTAL3 - tb_Open
expression =FormatNumber(Code.GetClosing(ReportItems!tb_TOTAL3.Value,ReportItems!tb_Open.Value))
I want to calculate the value of tb_Open and tb_Close. I try to use custom code for calculate them. tb_close is correct but tb_Open is not correct that show value = 0 .
My custom code:
Dim Shared prev_close As Double
Dim Shared now_close As Double
Dim Shared now_open As Double
Public Function GetClosing(TOTAL3 as Double,NowOpening as Double)
    now_close = TOTAL3 + NowOpening
    prev_close = now_close
    Return now_close
End Function
Public Function GetOpening(Month as String,NowOpen as Double)
    If Month = "1" Then
        now_open = NowOpen
    Else
        now_open = prev_close
    End If
    Return now_open
End Function
Thanks alot for your help!
Regards
Panda A

JTable - Swapping the Rows and Columns

This issue was raised in the Java Programming forum. Received initially as a weird requirement, it now seems that it is more common than you might think. Under it's original title it was "JTable - Limitation or Not?"
I introduced the topic here so that the thread perspective can include more experienced Swing developers.
The JTable in it's default layout is intended to hold database tables with records in rows. But what if you want records in columns?
Some have said why? Just accept the row layout. Others have said use a customised form. Both reasonable views. Despite this, others report that the inherrited power of the JTable is worth leveraging and they have been doing it for years. Albeit with messy code in certain cases.
This is a clear candidate for a popular derived component. If the existing JTable were renamed as a JTableRecordPerRow I am describing a JTableRecordPerColumn. The corresponding Table Model must naturally have a getRowClass method and no getColumnClass method.
Java is good at seperating data from display issues so essentially this is only a display issue. The data representation is unaffected.
While this may be so, the TableModel for a JTable makes the link from the display to the data so it must have knowledge about cell type to trigger the correct cell editor for example.
I think it is fair to say that the standard JTable has not be designed with alternative row/column or column/row displays in mind. Hence a single getColumnClass method. However implementing a Table model which exchanges columns for rows is a good start. This leaves a few loose ends where editting is concerned.
While this may not be an ideal topic for anyone just learning Swing I have been encouraged to consider the general case within the limitations of the cell types normally supported by the default Table model.
I would have a guess that this is an established component in many private Java libraries already.
Views and experience on this topic extremely welcome.

It appears to me that while interchanging the rows and columns of a JTable is not trivial it is still worthwhile as a workhorse component.
Perhaps the original design could have allowed for an aternative layout manager of somekind but this could easily have made description of records/rows and fields/columns confusing.
I will probably get this summary wrong but I aill attempt to collate the neatest approach as I see it. Criticisms or shorter steps welcome. My thanks to the original contributors traceable from this thread.
In the descriptions below a distinction is made between the normal internal data model representation of a row, called "mrow", and the displayed form "row".
Only the TableModel need be changed.
1 Use row 0 to show the headers by a)disabling the normal TableHeader renderer b)setting the cell renderer for column 0 to the default renderer used by the TableHeader and c)using the getValueAt method to return mcol header values for the row entries.
2 For other row, col values to getValueAt return the value at mcol, mrow where mcol==row-1 & mrow==col.
3 Create a new getCellClass(col,row) method to return the class where mrow==0 and mcol==row-1. Note that I am only trying to immitate the common use of of a database record per mrow here.
4 Override a)getCellRenderer and b)getCellEditor to use getCellClass
Four steps with seven parts seems worth it to me.
The power of Swing!
Many thanks to all.

How to save data from JTable multiple rows and columns

Hi Y_Not thanks for your help before...
But what should I do if I want to get/save many data from many column and rows??

i don't quite understand your (repeated) question. what is the problem with "multiple rows and columns". Y_NOT and i have shown you ways to access them.
all you need are 2 loops: one around your number of rows and one around the number of columns or vice versa depending in which order you want to save things:
for (int col = 0; col < data.size(); col++) {
    for (int row = 0 ; row < data[col].size(); row++) {
        // save your data
        saveData(data[col].getElementAt(row));
        // or use yourtable.getValueAt(row, col);
}this is not a problem of Swing/Java but of simple algorithm...
thomas

How to display 2 dimensional data. i.e with rows and columns?

Hi,
I want to know how to display multiple, variable
rows and columns that are got from the database through
queries in forms.
(i,e. a Matrix of Values,something similar to an Excel Spreadsheet).
Is there a component in forms similar to JTABLE that is
available in Java through which MULTIPLE, VARIABLE
rows and columns can be displayed ?.
I am not using a base table since this data is got thru
a number of packages and procedures that are used in
Loops.
NOTE : I am using forms 6i.
Thanks
Sharath.

I've heard Grant mention adding a Grid component to the Forms toolbox. From the context I would guess this is not yet even under development, so it's not going to be available anytime soon. And not for 6i.
Sorry, APC

How can i open a PDF bank statement in numbers so that the rows and columns contain properly aligned data from statement?

how can i open a PDF bank statement in "numbers" so that the rows and columns contain properly aligned data from statement?

Numbers can store pdfs pages or clippings but does not directly open pdf files. To get the bank statement into Numbers as a table I would open the bank statment in Preview (or Skim) or some pdf viewer.
Then hold the option key while selecting a column of data.
Then copy
Then switch to numbers and paste the column into a table
Then repeat for the other columns in the pdf document
It would be easier (in my opinion) to download the QFX or CSV version from your bank

How to get number of rows and columns in a two dimensional array ?

Hello,
What would be the simplest way to get number of rows and columns in a two dimensional array represented as integers ?
I'm looking for another solution as For...Each loop in case of large arrays.
Regards,
Petri

Hi Petri,
See a attached txt file for obtaining two arrays with upper and lower index values
Regards
Ray
Regards
Ray Farmer
Attachments:
Get2DArrayIndex.txt ‏2 KB

How do I delete multiple rows and columns in an image?

I am looking into how digital SLRs extract video data from a CMOS sensor. To give an example, the GH1 from Panasonic can record video at 1920 x 1080 from a 12 MPixel sensor that, say, is 4000 horizontal x 3000 vertical. How they do that seems to be not in the public domain, but there have been a few guesses (see http://www.dvxuser.com/V6/showthread.php?t=206797 and http://luminous-landscape.com/forum/index.php?showtopic=38713).
One approach would be to simply read every second row of sensor pixels (1500 rows read from the original 3000) and once you have those in memory, delete every second column (2000 columns left). You would end up with a 2000 x 1500 image which could then be resampled to 1920 x 1080.
I'd like to simulate what the camera appears to be doing, by generating a 4000 x 3000 test image and then asking Photoshop CS4 to delete the appropriate rows and columns. It may not necessarily be every second row; the Canon 5DMk11 appears to read every third row, so I may need to delete two out of every three rows.
Can Photoshop do that sort of thing? If so, how?

Thanks for the suggestions. Yes, I did take a detailed look at your images, but they weren't 100% convincing because it wasn't clear just what was happening. And Adobe's explanation, after reading it again, explains nothing at all to someone who doesn't know how Nearest Neighbor works.
But you are correct -- Nearest Neighbor does effectively delete pixels. I proved it with the attached 6 x 6 image of coloured pixels (the tiny midget image right after this full stop -- you'll have to go to maximum zoom in PS to see it).
These are the steps to delete every second row and then every second column.
1. Select Image > Image Size.
2. Set Pixel Dimensions > Height to half the original (in this case set to 3 pixels).
3. Set Resample Image to Nearest Neighbor.
4. Click OK and the image shoould now consist of three vertical white strips and three vertical Green-Red-Blue stripes.
5. Repeat steps 1-4, but this time set Pixel Dimensions > Width to half the original (in this case set to 3 pixels). The image should now consist of three horizontal stripes Green-Red-Blue.
Just to make sure the method worked for every third pixel, I repeated the above steps but with 2 pixels instead of 3 and obtained the correct White-Green, White-Green pattern.
I resampled the Height and Width separately for the test so that I could see what was happening. In a real example, the height and width can be changed at the same time in the one step, achieving the same results as above.
Finally, how to explain how Nearest Neighbor works in the simple cases described above?
Division by 2
In the case of an exact division by two (pixels numbered from top leftmost pixel), only the even numbered rows and columns remain. To put it a different way, every odd numbered row and column are deleted.
Division by 3
Only rows and columns 2, 5, 8, 11... remain.
Division by N
Only rows and columns 2, 2+N, 2+2N, 2+3N... remain.
To put it simply, a resample using Nearest Neighbor (using an exact integer multiple) keeps every Nth row and column, starting from number two. The rest are deleted.

Lock rows and columns header in a table view report. It is possible?

hi,
I have a Dashboard that displays a report in "Table View" with many rows and columns.
Is it possible to set a lock on the rows and columns like Excel?
This would have blocked such headers that contain attributes and measures and to browse the report (eg with a scroll bar) had always viewed the headers.
Can you help me?
Thanks

hi,
please go through this discussion
Re: SCROLL BAR to FREZZ HEADERS
thanks,
saichand.v

JTable - Rows and columns

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