JTable with Created Class
I have a class that I designed with 5 data members (2 Strings, 2 Dates and a Boolean) and I was wondering if it would be possible to have a JTable that I could just add objects to easily, and it would fill a row with a data member in each column, and have the boolean as a checkbox that would be checked when true and unchecked when false. Is there an easy way to go about this, or atleast a tip that you can give to help me out.?
Thanks in advance.
The [Bean Table Model|http://www.camick.com/java/blog.html?name=bean-table-model] was created for this situation.
Similar Messages
-
How do I create a jtable with horizontalScroll bar,plz help me!
I created a jtable component,Because my table's columns has 50 items,I must need a horizontalScroll Bar.
but I find the horizontalScroll don't display,when I add record to the jtable,the verticalScroll Bar is showed.How do I create a jtable with horizontalScroll bar,can u help me!
thank you in advance!Hi,
This piece of code will help :
//Get the Component Adapter for taking action against resizing of
//of Panel
ComponentListenerAdapter componentAdapter =
new ComponentListenerAdapter()
//Get the scrollbar or remove the scrollbar upon resizing
protected void resizingAction()
Container tableParent = table.getParent();
if (tableParent instanceof JViewport)
//Check if the width of the Table Parent Container
//is less than the Preferred Size of the Table
if (tableParent.getSize().getWidth() <
table.getPreferredSize().getWidth())
//Yes it is
//Remove the Auton Resize Function and get the
//Scrollbar
table.setAutoResizeMode(JTable.AUTO_RESIZE_OFF );
else
//No it is not
//Get the Auto Resize functionality back in place
table.setAutoResizeMode(
JTable.AUTO_RESIZE_SUBSEQUENT_COLUMNS);
//Add the component Adapter to the Table Header
table.getTableHeader().addComponentListener(componentAdapter);
private abstract class ComponentListenerAdapter
implements ComponentListener
* The <code>componentHidden<code> method has no implementation
* @param event The Event occured whenever the Component is Hidden
public void componentHidden(ComponentEvent event)
//No Implementaion - Intentially Left Blank
* The <code>componentShown</code> method has no implementation
* @param event The Event occured whenever the Component is Shown
public void componentShown(ComponentEvent event)
//No Implementaion - Intentially Left Blank
* The <code>componentMoved</code> method has no implementation
* @param event The Event occured whenever the Component is Moved
public void componentMoved(ComponentEvent event)
//No Implementaion - Intentially Left Blank
* The <code>componentResized</code> method is invoked whenever the
* component is resized. The resizing action will set the columns and
* scrollbar to act properly
* @param event The Event occured whenever the Component is Resized
public void componentResized(ComponentEvent event)
resizingAction();
* Subclasses of this override this method to determine what is to be
* done once the Component has been Resized
protected abstract void resizingAction();
Hope this will solve all your JTable horizontal resizing problems
--j -
Creating a JTable with resizeable columns and Horizontal Scrollbar
Hi,
I would like to create a JTable with about 24 columns in it. The problem is, my ViewPort in my JScrollPane is about 3-400pixels wide, and the JTable tries to cram itself into the ViewPort. This makes the columns too tiny to read. I'd like it to do something a little more sensible, like use the PreferredSize of the columns. Can anyone point me in the right direction to keep JTable from creating scrunched up little columns, so that it creates columns that are at least partially readable? Thanks.
BTW, I suppose I could set NO_AUTO_RESIZE but I would rather not do that. I like being able to resize columns. Basically what I want to do is control the JTable's width and not worry about the ViewPort's width.This made it impossible to resize columns. Works fine for me:
import java.awt.*;
import javax.swing.*;
import javax.swing.table.*;
public class TableHorizontal extends JFrame
public TableHorizontal()
JTable table = new JTable(5, 10);
table.setAutoResizeMode( JTable.AUTO_RESIZE_OFF );
JScrollPane scrollPane = new JScrollPane( table );
getContentPane().add( scrollPane );
table.getColumnModel().getColumn(0).setPreferredWidth(10);
table.getColumnModel().getColumn(1).setPreferredWidth(20);
table.getColumnModel().getColumn(2).setPreferredWidth(30);
table.getColumnModel().getColumn(3).setPreferredWidth(40);
table.getColumnModel().getColumn(4).setPreferredWidth(50);
public static void main(String[] args)
TableHorizontal frame = new TableHorizontal();
frame.setDefaultCloseOperation( EXIT_ON_CLOSE );
frame.pack();
frame.setVisible(true);
} -
How do I create a JTable with some empty cells in it?
I have a three column JTable. The first column is a String showing description. The second column contains numbers (double) and the third column also contains numbers. In some cases not all cells in a row should contain data. So for instance, I could have row one showing only description (a String in the first column), and then row two showing description (a String in the first column) and a number (a double in the second column) in columns one and two respectively. My problem is that, the data gets copied from the cells with data to the cells which are supposed to be empty. So, how do I create a JTable with some empty cells in it.
I have tried empty strings for those values, but it did not work. My table puts objects in an arraylist called reconciliation. The arraylist takes different objects with the same super class. The code below explains. Are you suggesting I pass null to my constructor?
JTable table = new JTable(new ReconTableModel());The method below is from the table model
protected List<Reconciliation> reconciliation = new ArrayList<Reconciliation>();
protected void fillModel(){
reconciliation.add(new CashBook("Cash Book Report"," "," "));
reconciliation.add(new CheckingBankAccount("Checking Bank Account"," "," "));
reconciliation.add(new BankBalance("Bank Balance As Per Bank Statement",500," "));
reconciliation.add(new PaymentVouchers("Payment Voucher Receipt",300," "));
reconciliation.add(new DepositVoucher("Deposit Voucher Receipt",1000," "));
reconciliation.add(new ReconciledBalance("Reconcilied Bank Balance",1200," "));
reconciliation.add(new BalanceAt("Bank Balance At",800," "));
reconciliation.add(new Difference("Difference",400," "));
Collections.sort( reconciliation, new Comparator<Reconciliation>(){
public int compare( Reconciliation a, Reconciliation b) {
return a.getTransactionName().compareTo( b.getTransactionName());
} -
How to create a Jar with only class files?
Dear all,
I want to create a jar file with only classes.My class files and java files are in different folders under com .
say
com
in com there are two folders
folder 1 -- subfolder 1
folder 2 -- subfolder 2
like this.
If i want to create a jar file from com directory how should i give the jar command.Again my jar should contain only .class files.
Any help will be appreciated
Thanks
lekshmiIt doesn't work.Says "No such class or directory"
Any other way Or is it possible to do so?Read the link I posted and create the statement to make your structure. I was thinking you were inside the com directory but if you are above it you will need something like this instead:
jar -cf test.jar com\*.class com\subfolder1\*.class com\subfoler2\*.class
But either way don't just copy and past this. Think about what is does so that you can make it work for you.
Also, you might want to look into using Ant if you are going to be building this a lot. -
Can we create JTable with multiple rows with varying number of columns ?
Hi All,
I came across a very typical problem related to JTable. My requirement is that cells should be added dynamically to the JTable. I create a JTable with initial size of 1,7 (row, columns) size. Once the 7 columns are filled with data, a new row should be created. But the requirement is, the new row i.e. second row should have only one cell in it initially. The number of cells should increase dynamically as the data is entered. The table is automatically taking the size of its previous row when new row is added. I tried by using setColumnCount() to change the number of columns to '1' for the second row but the same is getting applied to the first row also.
So can you please help me out in this regard ? Is it possible to create a JTable of uneven size i.e. multiple rows with varying number of columns in each row ?
Thanks in Advance.Well a JTable is always going to paint the same number of columns for each row. Anything is possible if you want to rewrite the JTable UI to do this, but I wouldn't recommend it. (I certainly don't know how to do it).
A simpler solution might be to override the isCellEditable(...) method of JTable and prevent editing of column 2 until data in column 1 has been entered etc., etc. You may also want to provide a custom renderer that renderers the empty column differently, maybe with a grey color instead of a white color. -
OWB ERROR: created with second class object failure
I'm getting this error when I import a table into the repository. any ideas?
created with second class object failureHello!
Second class objects are columns, indexes, constraints etc. Probably some of these contains reserved OWB keywords. You can check what went wrong by drilling down to these objects on the results screen.
Regards,
Robert -
How to create a JTable with CheckBox(checkbox should be added to a buttong)
hi,
i want a JTable with checkbox or radio button with them as editable.Only one check box can be selected i.e i want to add it to button group.no of rows in the table to not fixed
And on the click of radiobutton a text field has to be updated.
how to do this???
thanks
neelI think this article would be helpful:
http://www.chka.de/swing/table/columns.html
But don't expect any thanks from the OP!Exuse me my dummy question. But I am novice at this
forum. Who is OP and what do you mean?OP - Original Poster.
Thanks - a response indicating that your efforts in providing a solution to a problem are appreciated! -
JTable with JComboBox/JSpinner problem
The following code has a JTable with 2 columns.The lst column has JComboBoxes, the 2nd column has JSpinners.I want to set the spinner range of values based on the selection of JComboBox. The JComboBox selections are "small" and "large". For "small" the spinner should range from 0..49, for "large" from 50..99. When a selection is made, MyTable.itemStateChanged() is called, which in turn calls SpinnerEditor.setValueRange(). This sets an array with the desired values and then sets the model with this array. However, it sets the range not only for the row in which the combo box was clicked, but all rows.
So in MyTable.setCellComponents(), there is this:
spinnerEditor = new SpinnerEditor(this, defaultTableModel);
modelColumn.setCellEditor(spinnerEditor);
If the table has n rows, are n SpinnerEditors created, or just 1?
If 1, do n need to be created and if so, how?
public class MyTable extends JTable implements ItemListener {
private DefaultTableModel defaultTableModel;
private Vector<Object> columnNameVector;
private JComboBox jComboBox;
private SpinnerEditor spinnerEditor;
private final int COMBO_BOX_COLUMN = 0;
final static int SPINNER_COLUMN = 1;
public static String SMALL = "Small";
public String LARGE = "Large";
private final String[] SMALL_LARGE = {
SMALL,
LARGE };
public MyTable(String name, Object[][] variableNameArray, Object[] columnNameArray) {
columnNameVector = new Vector<Object>();
// need column names in order to make copy of table model
for (Object object : columnNameArray) {
columnNameVector.add(object);
defaultTableModel = new DefaultTableModel(variableNameArray, columnNameArray);
this.setModel(defaultTableModel) ;
setCellComponents();
setListeners();
private void setCellComponents() {
// combo box column -----------------------------------------------
TableColumn modelColumn = this.getColumnModel().getColumn(COMBO_BOX_COLUMN);
jComboBox = new JComboBox(SMALL_LARGE);
// set default values
for (int row = 0; row < defaultTableModel.getRowCount(); row++) {
defaultTableModel.setValueAt(SMALL_LARGE[0], row, COMBO_BOX_COLUMN);
modelColumn.setCellEditor(new DefaultCellEditor(jComboBox));
DefaultTableCellRenderer renderer = new DefaultTableCellRenderer();
renderer.setToolTipText("Click for small/large"); // tooltip
modelColumn.setCellRenderer(renderer);
// index spinner column ------------------------------------------------------------
modelColumn = this.getColumnModel().getColumn(SPINNER_COLUMN);
spinnerEditor = new SpinnerEditor(this, defaultTableModel);
modelColumn.setCellEditor(spinnerEditor);
renderer = new DefaultTableCellRenderer();
renderer.setToolTipText("Click for index value"); // tooltip
modelColumn.setCellRenderer(renderer);
private void setListeners() {
jComboBox.addItemListener(this);
@Override
public void itemStateChanged(ItemEvent event) {
// set spinner values depending on small or large
String smallOrLarge = (String)event.getItem();
if (this.getEditingRow() != -1 && this.getEditingColumn() != -1) {
spinnerEditor.setValueRange(smallOrLarge);
public static void main(String[] args) {
try{
UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
catch (Exception e){
e.printStackTrace();
String[] columnNameArray = {"JComboBox", "JSpinner"};
Object[][] dataArray = {
{"", "0"},
{"", "0"},
{"", "0"},
final MyTable myTable = new MyTable("called from main", dataArray, columnNameArray);
final JFrame frame = new JFrame();
frame.getContentPane().add(new JScrollPane(myTable));
frame.setTitle("My Table");
frame.setPreferredSize(new Dimension(200, 125));
frame.addWindowListener(new WindowAdapter(){
@Override
public void windowClosing(WindowEvent e) {
frame.setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE);
frame.setLocation(800, 400);
frame.pack();
frame.setVisible(true);
public class SpinnerEditor extends AbstractCellEditor implements TableCellEditor {
private JComponent parent;
private DefaultTableModel defaultTableModel;
private final JSpinner spinner = new JSpinner();
private String[] spinValues;
private int row;
private int column;
public SpinnerEditor(JTable parent, DefaultTableModel defaultTableModel ) {
super();
this.parent = parent;
this.defaultTableModel = defaultTableModel;
setValueRange(MyTable.SMALL);
// update every time spinner is incremented or decremented
spinner.addChangeListener(new ChangeListener(){
public void stateChanged(ChangeEvent e) {
String value = (String) spinner.getValue();
System.out.println ("SpinnerEditor.stateChanged(): " + value);
setValue(value);
private void setValue(String value) {
// save to equation string
System.out.println ("SpinnerEditor.setValue(): " + value + " at (" + row + ", " + MyTable.SPINNER_COLUMN + ")");
((JTable) parent).setValueAt(spinner.getValue(), this.row, this.column);
@Override
public Component getTableCellEditorComponent(JTable table, Object value, boolean isSelected, int row, int column) {
System.out.println ("SpinnerEditor.getTableCellEditorComponent(): row: " + row + "\tcolumn: " + column);
System.out.println ("SpinnerEditor.getTableCellEditorComponent(): value: " + value);
this.row = row;
this.column = column;
return spinner;
@Override
public boolean isCellEditable(EventObject evt) {
return true;
// Returns the spinners current value.
@Override
public Object getCellEditorValue() {
return spinner.getValue();
@Override
public boolean stopCellEditing() {
System.out.println("SpinnerEditor.stopCellEditing(): spinner: " + spinner.getValue() + " at (" + this.row + ", " + this.column + ")");
((JTable) parent).setValueAt(spinner.getValue(), this.row, this.column);
return true;
public void setValueRange(String smallOrLarge) {
System.out.println ("SpinnerEditor.setValueRange for " + smallOrLarge);
final int ARRAY_SIZE = 50;
if (MyTable.SMALL.equals(smallOrLarge)) {
final int MIN_SPIN_VALUE = 0;
final int MAX_SPIN_VALUE = 49;
//System.out.println ("SpinnerEditor.setValueRange(): [" + MIN_SPIN_VALUE + ".." + MAX_SPIN_VALUE + "]");
spinValues = new String[ARRAY_SIZE];
for (int i = MIN_SPIN_VALUE; i <= MAX_SPIN_VALUE; i++) {
spinValues[i] = new String(Integer.toString(i));
else { // large
final int MIN_SPIN_VALUE = 50;
final int MAX_SPIN_VALUE = 99;
//System.out.println ("SpinnerEditor.setValueRange(): [" + MIN_SPIN_VALUE + ".." + MAX_SPIN_VALUE + "]");
spinValues = new String[ARRAY_SIZE];
for (int i = 0; i <ARRAY_SIZE; i++) {
spinValues[i] = new String(Integer.toString(MIN_SPIN_VALUE + i));
//for (int i = 0; i <ARRAY_SIZE; i++) {
// System.out.println ("spinValues[" + i + "] = " + spinValues);
System.out.println ("SpinnerEditor.setValueRange(): [" + spinValues[0] + ".." + spinValues[ARRAY_SIZE-1] + "]");
// set model
spinner.setModel(new SpinnerListModel(java.util.Arrays.asList(spinValues)));However, it sets the range not only for the row in which the combo box was clicked, but all rows. Yes, because a single editor is used by the column.
One solution is to create two editors, then you override the getCellEditor(...) method to return the appropriated editor. Something like:
If (column == ?)
if (smallOrLarge)
return the small or large spinner editor
else
return the large spinner editor
else
return super.getCellEditor(...); -
JTable with custom column model and table model not showing table header
Hello,
I am creating a JTable with a custom table model and a custom column model. However the table header is not being displayed (yes, it is in a JScrollPane). I've shrunk the problem down into a single compileable example:
Thanks for your help.
import javax.swing.*;
import javax.swing.table.*;
public class Test1 extends JFrame
public static void main(String args[])
JTable table;
TableColumnModel colModel=createTestColumnModel();
TestTableModel tableModel=new TestTableModel();
Test1 frame=new Test1();
table=new JTable(tableModel, colModel);
frame.getContentPane().add(new JScrollPane(table));
frame.setSize(200,200);
frame.setVisible(true);
private static DefaultTableColumnModel createTestColumnModel()
DefaultTableColumnModel columnModel=new DefaultTableColumnModel();
columnModel.addColumn(new TableColumn(0));
return columnModel;
static class TestTableModel extends AbstractTableModel
public int getColumnCount()
return 1;
public Class<?> getColumnClass(int columnIndex)
return String.class;
public String getColumnName(int column)
return "col";
public int getRowCount()
return 1;
public Object getValueAt(int row, int col)
return "test";
public void setValueAt(Object aValue, int rowIndex, int columnIndex)
}Edited by: 802416 on 14-Oct-2010 04:29
addedKleopatra wrote:
jduprez wrote:
See http://download.oracle.com/javase/6/docs/api/javax/swing/table/TableColumn.html#setHeaderValue(java.lang.Object)
When the TableColumn is created, the default headerValue is null
So, the header ends up rendered as an empty label (probably of size 0 if the JTable computes its header size based on the renderer's preferred size).nitpicking (can't resist - the alternative is a cleanup round in some not so nice code I produced recently <g>):
- it's not the JTable's business to compute its headers size (and it doesn't, the header's the culprit.) *> - the header should never come up with a zero (or near-to) height: even if there is no title shown, it's still needed as grab to resize/move the columns. So I would consider this sizing behaviour a bug.*
- furthermore, the "really zero" height is a longstanding issue with MetalBorder.TableHeaderBorder (other LAFs size with the top/bottom of their default header cell border) which extends AbstractBorder incorrectly. That's easy to do because AbstractBorder itself is badly implemented
http://bugs.sun.com/bugdatabase/view_bug.do?bug_id=6459419
Thanks for the opportunity to have some fun :-)
JeanetteNo problem, thanks for the insight :) -
JTable with ImageIcons does not react to even handling
Hi.
I have a populated JTable with ONLY ImageIcons in it. I need to generate event responses on mouseClicks. However, any event listener I associate with this, nothing seems to be happening.
(Somehow, I'm guess the ImageIcons - which are rendered on a JLabel, are/is the source of all troubles!!)
The code is below :
import java.io.File;
import java.awt.Point;
import java.awt.Color;
import java.awt.Dimension;
import java.awt.Container;
import java.awt.Component;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;
import javax.swing.JFrame;
import javax.swing.JDialog;
import javax.swing.JLabel;
import javax.swing.JTable;
import javax.swing.ImageIcon;
import javax.swing.JScrollPane;
import javax.swing.ListSelectionModel;
import javax.swing.table.TableColumn;
import javax.swing.table.TableCellRenderer;
import javax.swing.table.AbstractTableModel;
import javax.swing.event.ListSelectionEvent;
import javax.swing.event.ListSelectionListener;
* Entry point for the Images Table.
* @author Raj Gaurav
public class SpecialCharacterDialog extends JDialog{
String collectionString[] = null;
ImageIcon suite[] = null;
public SpecialCharacterDialog() {
Container contentPane = getContentPane();
// Create the Table Model and create the Table from the model
MyTableModel model = new MyTableModel();
JTable table = new JTable(model);
table.setDefaultRenderer(ImageIcon.class, new CustomCellRenderer());
table.setCellSelectionEnabled(true);
table.setSelectionMode(ListSelectionModel.SINGLE_SELECTION);
ListSelectionModel rowSM = table.getSelectionModel();
rowSM.addListSelectionListener(new ListSelectionListener() {
public void valueChanged(ListSelectionEvent e) {
//Ignore extra messages.
if (e.getValueIsAdjusting()) return;
ListSelectionModel lsm = (ListSelectionModel)e.getSource();
if (lsm.isSelectionEmpty()) {
System.out.println("No rows are selected.");
} else {
int selectedRow = lsm.getMinSelectionIndex();
System.out.println("Row " + selectedRow
+ " is now selected.");
// Add the table to the contentPane
JScrollPane pane = new JScrollPane(table);
contentPane.add(pane);
* This class contains all the DATA information, the ImageIcons
* needed for display.
class SymbolCollection {
final static int NUMBER_OF_COLUMNS = 15;
private String collectionString[] = null;
private ImageIcon suite[] = null;
* Constructor : Initialises all the ImageIcon and their Names.
public SymbolCollection() {
File f = new File("C:\\Test\\Images");
collectionString = f.list();
int numberOfImages = collectionString.length;
suite = new ImageIcon[numberOfImages];
for(int i = 0;i < numberOfImages; i++) {
suite[i] = new ImageIcon("C:\\Test\\images" + File.separator + collectionString);
* Returns the total number of images in "images" folder.
public int getTotalNumberOfImages() {
return suite.length;
* Returns the target ImageIcon.
public ImageIcon getImageIconAt(int number) {
return suite[number];
* Returns the target ImageIcon Name.
public String getImageIconNameAt(int number) {
return collectionString[number];
* Returns an array of ALL the ImageIcons available.
public ImageIcon[] getImageIcons() {
return suite;
* Returns an array of ALL the ImageIcon names available
public String[] getImageIconNames() {
return collectionString;
* Returns TRUE for all cells
public boolean isEditable(int row, int col) {
return true;
* Defines the table model for the tabel.
class MyTableModel extends AbstractTableModel {
private SymbolCollection collection = null;
private Object data[][] = null;
* Constructor for the TableModel. Initialises the "data" field for table.
public MyTableModel() {
int countOfImages = 0;
collection = new SymbolCollection();
data = new Object[getRowCount()][SymbolCollection.NUMBER_OF_COLUMNS];
for(int i = 0; i < getRowCount(); i++) {
for(int j = 0; j < SymbolCollection.NUMBER_OF_COLUMNS; j++) {
if(countOfImages == collection.getTotalNumberOfImages()) {
break;
data[i][j] = collection.getImageIconAt(countOfImages);
countOfImages++;
* Returns the number of rows for this table.
* It is calculated as : TotalNumber/NumberOfColumns if remainder is ZERO or,
* TotalNumber/NumberOfColumns + 1 if not.
public int getRowCount() {
int numberOfRows = collection.getTotalNumberOfImages()/SymbolCollection.NUMBER_OF_COLUMNS;
if(numberOfRows == 0) {
return numberOfRows;
else {
return numberOfRows + 1;
* Returns the number of Columns for this table
public int getColumnCount() {
return SymbolCollection.NUMBER_OF_COLUMNS;
* Returns the CLASS data type for this table
public Class getColumnClass(int col) {
return collection.getImageIconAt(0).getClass();
* Returns the table data at (row, col).
public Object getValueAt(int row, int col) {
return data[row][col];
* Renders the table to display images in individual cells
class CustomCellRenderer extends JLabel implements TableCellRenderer {
public Component getTableCellRendererComponent(JTable table, Object value, boolean isSelected, boolean hasFocus, int row, int col) {
setIcon((ImageIcon)value);
return this;Hi.
I have a populated JTable with ONLY ImageIcons in it. I need to generate event responses on mouseClicks. However, any event listener I associate with this, nothing seems to be happening.
(Somehow, I'm guess the ImageIcons - which are rendered on a JLabel, are/is the source of all troubles!!)
The code is below :
import java.io.File;
import java.awt.Point;
import java.awt.Color;
import java.awt.Dimension;
import java.awt.Container;
import java.awt.Component;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;
import javax.swing.JFrame;
import javax.swing.JDialog;
import javax.swing.JLabel;
import javax.swing.JTable;
import javax.swing.ImageIcon;
import javax.swing.JScrollPane;
import javax.swing.ListSelectionModel;
import javax.swing.table.TableColumn;
import javax.swing.table.TableCellRenderer;
import javax.swing.table.AbstractTableModel;
import javax.swing.event.ListSelectionEvent;
import javax.swing.event.ListSelectionListener;
* Entry point for the Images Table.
* @author Raj Gaurav
public class SpecialCharacterDialog extends JDialog{
String collectionString[] = null;
ImageIcon suite[] = null;
public SpecialCharacterDialog() {
Container contentPane = getContentPane();
// Create the Table Model and create the Table from the model
MyTableModel model = new MyTableModel();
JTable table = new JTable(model);
table.setDefaultRenderer(ImageIcon.class, new CustomCellRenderer());
table.setCellSelectionEnabled(true);
table.setSelectionMode(ListSelectionModel.SINGLE_SELECTION);
ListSelectionModel rowSM = table.getSelectionModel();
rowSM.addListSelectionListener(new ListSelectionListener() {
public void valueChanged(ListSelectionEvent e) {
//Ignore extra messages.
if (e.getValueIsAdjusting()) return;
ListSelectionModel lsm = (ListSelectionModel)e.getSource();
if (lsm.isSelectionEmpty()) {
System.out.println("No rows are selected.");
} else {
int selectedRow = lsm.getMinSelectionIndex();
System.out.println("Row " + selectedRow
+ " is now selected.");
// Add the table to the contentPane
JScrollPane pane = new JScrollPane(table);
contentPane.add(pane);
* This class contains all the DATA information, the ImageIcons
* needed for display.
class SymbolCollection {
final static int NUMBER_OF_COLUMNS = 15;
private String collectionString[] = null;
private ImageIcon suite[] = null;
* Constructor : Initialises all the ImageIcon and their Names.
public SymbolCollection() {
File f = new File("C:\\Test\\Images");
collectionString = f.list();
int numberOfImages = collectionString.length;
suite = new ImageIcon[numberOfImages];
for(int i = 0;i < numberOfImages; i++) {
suite[i] = new ImageIcon("C:\\Test\\images" + File.separator + collectionString);
* Returns the total number of images in "images" folder.
public int getTotalNumberOfImages() {
return suite.length;
* Returns the target ImageIcon.
public ImageIcon getImageIconAt(int number) {
return suite[number];
* Returns the target ImageIcon Name.
public String getImageIconNameAt(int number) {
return collectionString[number];
* Returns an array of ALL the ImageIcons available.
public ImageIcon[] getImageIcons() {
return suite;
* Returns an array of ALL the ImageIcon names available
public String[] getImageIconNames() {
return collectionString;
* Returns TRUE for all cells
public boolean isEditable(int row, int col) {
return true;
* Defines the table model for the tabel.
class MyTableModel extends AbstractTableModel {
private SymbolCollection collection = null;
private Object data[][] = null;
* Constructor for the TableModel. Initialises the "data" field for table.
public MyTableModel() {
int countOfImages = 0;
collection = new SymbolCollection();
data = new Object[getRowCount()][SymbolCollection.NUMBER_OF_COLUMNS];
for(int i = 0; i < getRowCount(); i++) {
for(int j = 0; j < SymbolCollection.NUMBER_OF_COLUMNS; j++) {
if(countOfImages == collection.getTotalNumberOfImages()) {
break;
data[i][j] = collection.getImageIconAt(countOfImages);
countOfImages++;
* Returns the number of rows for this table.
* It is calculated as : TotalNumber/NumberOfColumns if remainder is ZERO or,
* TotalNumber/NumberOfColumns + 1 if not.
public int getRowCount() {
int numberOfRows = collection.getTotalNumberOfImages()/SymbolCollection.NUMBER_OF_COLUMNS;
if(numberOfRows == 0) {
return numberOfRows;
else {
return numberOfRows + 1;
* Returns the number of Columns for this table
public int getColumnCount() {
return SymbolCollection.NUMBER_OF_COLUMNS;
* Returns the CLASS data type for this table
public Class getColumnClass(int col) {
return collection.getImageIconAt(0).getClass();
* Returns the table data at (row, col).
public Object getValueAt(int row, int col) {
return data[row][col];
* Renders the table to display images in individual cells
class CustomCellRenderer extends JLabel implements TableCellRenderer {
public Component getTableCellRendererComponent(JTable table, Object value, boolean isSelected, boolean hasFocus, int row, int col) {
setIcon((ImageIcon)value);
return this; -
Hi, i'm having trouble in filling a jtable with data
hi, i'm having trouble in filling a jtable with data, but the real problem is that i have stablished a JDBC connection throught the windowsxp ODBC to my database written on microsoft access platform, so i created my table
public CenterPanel(){
panel = new JPanel();
dataTable = new JTable(10,10);
dataTable.setBorder(BorderFactory.createLineBorder(Color.black,2));
panel.add(dataTable);
setLayout(new BorderLayout());
add(panel,BorderLayout.CENTER);
i can see the table on my driver, but i want to fill it by connecting to the database and fil the fields from the database, i have the code to connect and retrieve the fields but on the dos, i want to fill them in the table,
the code for accessing is
Class.forName("sun.jdbc.odbc.JdbcOdbcDriver");
Connection conn1 = DriverManager.getConnection ("jdbc:odbc:EHLAN",
"marius","svasdiga");
Statement stmt1 = conn1.createStatement();
Statement stmt2 = conn1.createStatement();
ResultSet rs1 = stmt1.executeQuery ("select * from Appartment");
System.out.println("App. Num, Stair Num, Elec. Num");
while (rs1.next()) {
System.out.print (rs1.getInt ("appnum") + ","+" ");
System.out.print (rs1.getString ("staircase") + ","+" ");
System.out.println (rs1.getInt("electrnum") );
ResultSet rs2 = stmt2.executeQuery ("select * from Person");
System.out.println("First Name, Last Name, Blood Type");
while (rs2.next()) {
System.out.print (rs2.getString ("namef") + ","+" ");
System.out.print (rs2.getString ("namel") + ","+" ");
System.out.println (rs2.getString("bloodType") );
so help me to fill this data to the table. thank you
yours sincerely,
marius ajemianhi, i'm having trouble in filling a jtable with data, but the real problem is that i have stablished a JDBC connection throught the windowsxp ODBC to my database written on microsoft access platform, so i created my table
public CenterPanel(){
panel = new JPanel();
dataTable = new JTable(10,10);
dataTable.setBorder(BorderFactory.createLineBorder(Color.black,2));
panel.add(dataTable);
setLayout(new BorderLayout());
add(panel,BorderLayout.CENTER);
i can see the table on my driver, but i want to fill it by connecting to the database and fil the fields from the database, i have the code to connect and retrieve the fields but on the dos, i want to fill them in the table,
the code for accessing is
Class.forName("sun.jdbc.odbc.JdbcOdbcDriver");
Connection conn1 = DriverManager.getConnection ("jdbc:odbc:EHLAN",
"marius","svasdiga");
Statement stmt1 = conn1.createStatement();
Statement stmt2 = conn1.createStatement();
ResultSet rs1 = stmt1.executeQuery ("select * from Appartment");
System.out.println("App. Num, Stair Num, Elec. Num");
while (rs1.next()) {
System.out.print (rs1.getInt ("appnum") + ","+" ");
System.out.print (rs1.getString ("staircase") + ","+" ");
System.out.println (rs1.getInt("electrnum") );
ResultSet rs2 = stmt2.executeQuery ("select * from Person");
System.out.println("First Name, Last Name, Blood Type");
while (rs2.next()) {
System.out.print (rs2.getString ("namef") + ","+" ");
System.out.print (rs2.getString ("namel") + ","+" ");
System.out.println (rs2.getString("bloodType") );
so help me to fill this data to the table. thank you
yours sincerely,
marius ajemian -
Problem sorting JTable with custom cell editor
Greetings,
I have created a JTable with a JComboBox as the cell editor for the first column. However, I couldn't simply set the default cell editor for the column to be a JComboBox, since the values within the list were different for each row. So instead, I implemented a custom cell editor that is basically just a hashtable of cell editors that allows you to have a different editor for each row in the table (based on the ideas in the EachRowEditor I've seen in some FAQs - see the code below). I also used a custom table model that is essentially like the JDBCAdapter in the Java examples that populates the table with a query to a database.
The problem comes when I try to sort the table using the TableSorter and TableMap classes recommended in the Java Tutorials on JTables. All of the static (uneditable) columns in the JTable sort fine, but the custom cell editor column doesn't sort at all. I think that the problem is that the hashtable storing the cell editors never gets re-ordered, but I can't see a simple way to do that (how to know the old row index verses the new row index after a sort). I think that I could implement this manually, if I knew the old/new indexes...
Here's the code I use to create the JTable:
// Create the Table Model
modelCRM = new ContactTableModel();
// Create the Table Sorter
sorterCRM = new TableSorter(modelCRM);
// Create the table
tblCRM = new JTable(sorterCRM);
// Add the event listener for the sorter
sorterCRM.addMouseListenerToHeaderInTable(tblCRM);
Then, I populate the column for the custom cell editor like this:
// Add the combo box for editing company
TableColumn matchColumn = getTable().getColumn("Match");
RowCellEditor rowEditor = new RowCellEditor();
// loop through and build the combobox for each row
for (int i = 0; i < getTable().getRowCount(); i++) {
JComboBox cb = new JComboBox();
cb.addItem("New");
//... code to populate the combo box (removed for clarity)
rowEditor.add(i,new DefaultCellEditor(cb, i))); //TF
} // end for
matchColumn.setCellEditor(rowEditor);
Any ideas how to do this, or is there a better way to either sort the JTable or use a combobox with different values for each row? Please let me know if more code would help make this clearer...
Thanks,
Ted
import java.util.*;
import java.awt.*;
import javax.swing.*;
import javax.swing.table.*;
import javax.swing.event.*;
public class RowCellEditor implements TableCellEditor
protected Hashtable editors;
protected TableCellEditor editor, defaultEditor;
public RowCellEditor()
editors = new Hashtable();
defaultEditor = new DefaultCellEditor(new JTextField());
public void add(int row, TableCellEditor editor)
editors.put(new Integer(row), editor);
public Component getTableCellEditorComponent(JTable table,
Object value,
boolean isSelected,
int row,
int column)
editor = (TableCellEditor) editors.get(new Integer(row));
if (editor == null)
editor = defaultEditor;
return editor.getTableCellEditorComponent(table,
value,
isSelected,
row,
column);
public Object getCellEditorValue() {
return editor.getCellEditorValue();
public boolean stopCellEditing() {
return editor.stopCellEditing();
public void cancelCellEditing() {
editor.cancelCellEditing();
public boolean isCellEditable(EventObject anEvent) {
return true; //TF
//return editor.isCellEditable(anEvent);
public void addCellEditorListener(CellEditorListener l) {
editor.addCellEditorListener(l);
public void removeCellEditorListener(CellEditorListener l) {
editor.removeCellEditorListener(l);
public boolean shouldSelectCell(EventObject anEvent) {
return editor.shouldSelectCell(anEvent);
-------------------Well, I found a solution in another post
(see http://forum.java.sun.com/thread.jsp?forum=57&thread=175984&message=953833#955064 for more details).
Basically, I use the table sorter to translate the row index for the hashtable of my custom cell editors. I did this by adding this method to the sorter:
// This method is used to get the correct row for the custom cell
// editor (after the table has been sorted)
public int translateRow(int sortedRowIndex)
checkModel();
return indexes[sortedRowIndex];
} // end translateRow()
Then, when I create the custom cell editor, I pass in a reference to the sorter so that when the getTableCellEditorComponent() method is called I can translate the row to the newly sorted row before returning the editor from the hashtable. -
JTable with headers extending JDialog
I am creating a class file extending JDialog. I have populated the JTable on the form and want to include headers on the table. The dialog form opens and the table is visible and populated but with no headers. Has anyone had success with headers on JTables when creating a JDialog object?
I have other tables created with headers so I wondered if the problem was with JDialog?inorder to make headers visible you need to add scroll pane to table,
either by:
JScrollPane scrollPane = JTable.createScrollPaneForTable(table);
or:
scrollPane = new JScrollPane(table);
unless there's no scroller, you can't see headers. -
Characteristic relationship with Exit class is not applied correctly
We are using a characteristic relationship (with derivation) type Exit class. For that we have created class ZCL_RSPLS_ARTICLE_FROM_PLMOD as a copy of the standard class CL_RSPLS_CR_EXIT_BASE.
Target and source characteristics are members of the aggregation level.
We want to generate a list of valid combinations of characteristics planning models and articles which should be planned in the planning query.
For that we are using the method IF_RSPLS_CR_METHODS~CREATE:
Source is characteristic Model ZMATMOD and we determine in the exit class all active articles ZMATART.
We get a list of active (planning relevant) models and articles in our exit class (table e_th_chas).
--> For instance 6 combinations
Until here everything works fine.
The problem is that in the query 8 combinations are displayed.
We have no idea why more than the generated combinations are displayed.
One reason could be that the characteristic article ZMATART is an attribute from characteristic model ZMATMOD.
So from a master data point of view 8 combinations would be relevant.
But we use the exit class in order to reduce the number of combinations to planning relevant items.
If we use the method IF_RSPLS_CR_METHODS~CHECK we could flag the 2 combinations which are not planning relevant to not valid.
But these are then displayed in the query. 6 combinations in change mode; 2 combinations in display mode. This would not help us.
We would like to see only the planning relevant combinations 6 combinations
Can anyone please help me urgently?
Best regards
MartinHi,
set a break-point in the factory method get_instance to check whether the class is called. In the planning modeler make sure that you use an external break-point.
Or use rsrt an change a cell value: Derivation is called in the delta buffer to derive from the fields contained in the aggregation level. So check also that the source fields are contained in the aggregation level or can be derived via a a chain of derivations.
Also make sure that all source fields have to be non-initial. The system will not call derivation for initial source fields since in this case there is not unique target, cf. http://help.sap.com/saphelp_nw70/helpdata/en/43/1c3d0f31b70701e10000000a422035/frameset.htm
Remark: The attached document of note 994853 is about the disaggregation feature but it also contains a section about the characteristic relationships. Observe also that the template exit classes are documented in SE24.
Regards,
Gregor
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