Develop Reference

Getting old values from Jtable

I am facing a strange problem with the Jtable. I have a small standalone java application in which I have used Jtable that shows data that is retrieved from database. User can view and edit the data. Once he edit the cell and presses the update button then the edited values will be updated in the database. Now what happening is for the first time when user edit the data and click on update button then the values are properly persisted in the database and user gets out of the module. But again if he/she goes to the same module and edits some more cells and click on update button then in back end i get old value from those cells although the Jtable shows the latest updated values in the cells.
Below is the code.
private JTable jt;
private TableRowSorter<TableModel> tableSorter;
private Dao dao=new Dao();
updateDetails.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
boolean isSuccessful = true;
int rowCount = jt.getRowCount();
List<EmployeeMaster> empMasterList = new ArrayList<>();
int j = 0;
for (int i = 0; i < rowCount; i++) {
EmployeeMaster master = new EmployeeMaster();
j = 0;
try {
master.setEmpId(Long.parseLong((String) jt.getValueAt(i, j)));
j++;
compId.setName(Long.parseLong((String) jt.getValueAt(i, j)));
j++;
compId.setNumber((String) jt.getValueAt(i, j));
j++;
empMasterList.add(master);
}
dao.updateAllEmpDetails(empMasterList);
homePanel.setVisible(true);
UpdateEmp.setVisible(false);
}
}
});
getDataFromDBtoJtable.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
List<EmployeeMaster> empMasterList = dao.getAllEmpDetails();
String data[][] = new String[empMasterList.size()][3];
int i = 0;
int j = 0;
for (EmployeeMaster employeeMaster : empMasterList) {
j = 0;
data[i][j] = String.valueOf(employeeMaster.getEmpId());
j++;
data[i][j] = String.valueOf(employeeMaster.getName());
j++;
data[i][j] = String.valueOf(employeeMaster.getNumber());
i++;
}
String column[] = { "ID", "Name", "Number"};
jt = new JTable(data, column) {
public boolean isCellEditable(int row, int column) {
if (column == 0 || column == 1 || column == 2)
return false;
else
return true;
};
};
tableSorter = new TableRowSorter<TableModel>(jt.getModel());
jt.setBounds(12, 12, 1200, 400);
jt.setRowSorter(tableSorter);
homePanel.setVisible(false);
UpdateEmp.setVisible(true);
JScrollPane pane = new JScrollPane(jt);
pane.setBounds(1, 40, 1150, 300);
setBounds(0, 0, 2000, 800);
UpdateEmp.add(pane);
}
});
updateDetails -> button to get the data from jtable and update it in database
getDataFromDBtoJtable -> button to get data from Database and show it in Jtable
Whenever user hits the updateDetails i am updating the database and forcing user to get out of the module. So everytime whenever user get into jtable module he/she gets new Jtable instance. But still unable to identify what's going wrong.

JTable select and deselect not working

I have a problem with my JTable. Firstly I selected some entries in my table. However when I deselect some of them, the table could not understand it.
Example scenario: I select job1 and 2 for the testing after that I change my mind and de-select job2. But in the result I saw job1 job1 and job2 ( job 1 seen 2 times and even though I dis-select job 2 I saw them.) Or after selected all the jobs ( choose all button) I want to deselect all of them (Clear button) when I click clear all the table seems empty. It is good but somehow the background of the program still protect the all old selection. How can I solve this?
Try:
I created the row of my table by read csv file.
public class JobSelectionListPanel extends JPanel {
private static final long serialVersionUID = 5198916547962359735L;
private static JobSelectionListPanel INSTANCE = new JobSelectionListPanel();
public static JobSelectionListPanel getInstance() {
return INSTANCE;
}
private JTable table;
private JButton next, back, btnClear, btnNewButton, btnChooseAll;
private JobList fnnJobList = new JobList();
private JobSelectionListPanel() {
table = new JTable();
JScrollPane scrollPane = new JScrollPane(table);
table.setBorder(new CompoundBorder());
// Read all FNN jobs from file
try {
fnnJobList.readFromFile("rules.csv");
} catch (IOException e1) {
System.out.println("You are not able to read the rules.csv file");
}
// Create ArrayList of JobNames
Object[][] initialData = new Object[fnnJobList.size()][1];
int i = 0;
for (Job jobDes : fnnJobList) {
initialData[i][0] = (Object) jobDes.getJobname();
i++;
}
String[] columnNames = new String[] { "", "Your preferences" };
table.setModel(new DefaultTableModel(initialData, columnNames) {
private static final long serialVersionUID = 1L;
#SuppressWarnings("rawtypes")
Class[] columnTypes = new Class[] { Object.class, Boolean.class };
#SuppressWarnings({ "unchecked", "rawtypes" })
public Class getColumnClass(int columnIndex) {
return columnTypes[columnIndex];
}
});
table.getColumnModel().getColumn(1).setPreferredWidth(80);
table.getColumnModel().getColumn(1).setMinWidth(40);
table.setSelectionMode(ListSelectionModel.MULTIPLE_INTERVAL_SELECTION);
table.setCellSelectionEnabled(true);
I user want to choose all rows then I implemented this.
btnChooseAll = new JButton("Choose all");
btnChooseAll.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
DefaultTableModel chooseAllData = (DefaultTableModel) table.getModel();
if (DeviceGroups.DeviceAList.size() == 0 || DeviceGroups.DeviceBList.size() == 0
|| DeviceGroups.DeviceCList.size() == 0 || DeviceGroups.DeviceDList.size() == 0)
JOptionPane.showMessageDialog(null,
"You should choose at least 1 device for each test device to apply this test case", "Invalid OPTION",
JOptionPane.ERROR_MESSAGE);
else
for (int i = 0; i < chooseAllData.getRowCount(); i++) {
for (int j = 1; j < chooseAllData.getColumnCount(); j++) {
chooseAllData.setValueAt(true, i, j);
}
}
}
});
For clear all preferences :
btnClear = new JButton("Clear all");
// Clear button create a model of JTable and delete all the rows of table!!
btnClear.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
DefaultTableModel clearTableData = (DefaultTableModel) table.getModel();
for (int i = 0; i < clearTableData.getRowCount(); i++) {
for (int j = 1; j < clearTableData.getColumnCount(); j++) {
clearTableData.setValueAt(null, i, j);
}
}
}
});

I see the following problem in your code: mixing up view indexes and model indexes. This is the offending snippet:
for (int i = 0; i < table.getRowCount(); i++) {
if (table.getValueAt(i, 1) != null) {
if (((Boolean) table.getValueAt(i, 1)).booleanValue()) {
String jobName = (((DefaultTableModel) table.getModel()).getValueAt(i, 0).toString());
You are using the i variable to denote view row indices, since you are checking values in this statement: table.getValueAt(i, 1) != null.
But then a bit further you are using i to index the model:
String jobName = ((DefaultTableModel) table.getModel()).getValueAt(i, 0).toString();
If i is to be a view index, you need to convert it to a model index before indexing the model:
String jobName = ((DefaultTableModel) table.getModel()).getValueAt(table.convertRowIndexToModel(i), 0).toString();
Also, when columns would be switched around in the view (ie on screen in your GUI), the following will probably not work as intended:
table.getValueAt(i, 1) != null
You most likely mean to say, get the second column value in the model, not the view. Best rewrite then as
table.getValueAt(i, table.convertColumnIndexToView(1)) != null

How to add buttons inside a cell of jtable and give it action

i know this has been answered before but considering im still a newbie i cant figure out a way to give actions and block the cell editing, i have tried it in several ways,i can successfully render the buttons however when i click on it, it edits the cell instead of pressing the button, i know that in order to avoid the cell editing i should create an abstract table and overide this method:
public boolean isCellEditable(int row, int col) {
//Note that the data/cell address is constant,
//no matter where the cell appears onscreen.
if (col < 3) {
return false;
} else {
return true;
}
}
however im using a default JTable,so this is the code i am using for the Panel and cell renderer:
class PlusMinusCellRenderer extends JPanel implements TableCellRenderer {
public Component getTableCellRendererComponent(
final JTable table, Object value,
boolean isSelected, boolean hasFocus,
int row, int column) {
if(column < 3)
{
JLabel campo = new JLabel(value.toString());
this.add(campo);
}
if(column > 2)
{
//this is a button
this.add(botaoteste);
materialtable.revalidate();
materialtable.repaint();
}
return this;
}
and this is the code i am using to retrieve data from sql to the Jtable(I customised the DefaultJTable code)
String[] columnNames={"teste","abc","def"};
Object[][] data = new Object[1][4];
if(createConnection())
{
try {
Statement statemt = conLogin.createStatement();
ResultSet rs = statemt.executeQuery("SELECT * FROM Materiais");
//ResultSet rs = statemt.executeQuery("SELECT * FROM Materiais");
rsmtdata = rs.getMetaData();
//int columns = rsmtdata.getColumnCount();
columnNames = new String[]{rsmtdata.getColumnName(1),rsmtdata.getColumnName(2),rsmtdata.getColumnName(3),"Deletar"};
if(rs.next())
{
data[0][0] = rs.getString(1);
data[0][1] = rs.getString(2);
data[0][2] = rs.getString(3);
data[0][3] = new Boolean(false);
}
while (rs.next())
{
Object[][] temp = new Object[data.length+1][4];
for(int i=0;i < data.length;i++)
{
for(int j = 0;j < 4;j++)
{
temp[i][j] = data[i][j];
}
}
temp[data.length][0] = rs.getString(1);
temp[data.length][1] = rs.getString(2);
temp[data.length][2] = rs.getString(3);
temp[data.length][3] = new Boolean(false);
data = temp;
}
materialtable = new javax.swing.JTable(data, columnNames);
materialtable = new javax.swing.JTable(data, columnNames){
public TableCellRenderer getCellRenderer( int row, int column ) {
return new PlusMinusCellRenderer();
}
};
materialtable.setRowHeight( 32 );
} catch (SQLException ex) {
Logger.getLogger(ProfessorForm.class.getName()).log(Level.SEVERE, null, ex);
}
}
//Create the scroll pane and add the table to it.
materialtable.setBackground(new java.awt.Color(153, 255, 51));
materialtable.setSelectionBackground(new java.awt.Color(255, 255, 51));
materialtable.setSelectionForeground(new java.awt.Color(255, 102, 0));
jScrollPane3.setViewportView(materialtable);
so to render the button inside the table i based on this thread:
Adding Buttons inside cell of JTable along with data?
my question is very straight forward, how can i disable Row editing(just like the isCellEditable() method usage) and give action to the buttons?
any help here is greatly appreciated and please take it to consideration im still novice so please detailed information or samples is needed !
Kind regards,
Romulo Romero

You need both a renderer and and editor, as shown in this example. See How to Use Tables: Editors and Renderers for details. Tangentially, you should override the method isCellEditable() in your TableModel rather than extending JTable.

Java Swing JTable: cannot access the values in the table due to incorrect usage/creation of table model

I am just beginning to program using Java Swing. I am not very familiar with each of the many Java Swing Classes, and have ran into a stumbling block regarding the creation of a Table.
I am trying to figure out how to add a table to a Java Swing Program I am making. I have looked at docs.oracle.com to try and figure it out but I am getting an error when I try to access the values of the table. I will include my code to help show what I am currently trying to do and where the error is.
This is my code for making the table and the table model (I think the problem is that my table model is not working correctly):
/*Create the Table Entry*/
columnNames = new String[listoffields.size()+1];
columnNames[0] = "Record Number";
for(int a = 1; a < columnNames.length;a++){
columnNames[a] = listoffields.get(a-1).getTitle();
}
int count = 1;
data = new Object[numrecords][listoffields.size()+1];
for(int a = 0; a < numrecords;a++){
for(int b = 0; b < listoffields.size()+1;b++){
if(b == 0){
data[a][b] = count;
count++;
}
else{
data[a][b] = "";
}
}
}
/* create the table */
JTable table = new JTable(data,columnNames);
table.setCellSelectionEnabled(true);
table.setModel(new AbstractTableModel() {
public String getColumnName(int col) {
return columnNames[col].toString();
}
public int getRowCount() { return data.length; }
public int getColumnCount() { return columnNames.length; }
public Object getValueAt(int row, int col) {
return data[row][col];
}
public boolean isCellEditable(int row, int col) {
return (col >= 1);
}
public void setValueAt(Object value, int row, int col) {
data[row][col] = value;
fireTableCellUpdated(row, col);
}
});
JScrollPane scrollPane = new JScrollPane(table);
table.setFillsViewportHeight(true);
/* addthe table to the JTable tableentry*/
tabelentry.setLayout(new BoxLayout(ProjectFrame.tabelentry, BoxLayout.Y_AXIS));
tabelentry.add(scrollPane);
tabelentry.setSelectionMode(ListSelectionModel.SINGLE_SELECTION);
After the table is displayed and I edit the blank values for each cell, I click a submit button that submits the cell. However, the following error is encountered:
Exception in thread "AWT-EventQueue-0" java.lang.ArrayIndexOutOfBoundsException: 0 >= 0
at java.util.Vector.elementAt(Unknown Source)
at javax.swing.table.DefaultTableModel.getValueAt(Unknown Source)
at Client.GUIComponents.ProjectFrame$1.submit(NameOfFile.java:LineNumber)
The error is encountered when trying to submit as follows:
public void submit(){
String recordvalues = ""; //contains a String representation of what I want to submit
for(int a = 0; a < numberoffields;a++){
for(int b = 0; b < numberofrecords;b++){
if(a != 0){ //I want to skip the first column
recordvalues = recordvalues + (String) tabelentry.getModel().getValueAt(b, a) + ","; //The error is at this line in the code
}
}
}
}
I provided my code to give an example of the current problems I am encountering and what I have currently tried. To generalize my question, I am wondering how to correctly write a table model class so that I can access the values at each of the cells in the table. Any assistance would be helpful. Thanks a ton!

My immediate thought is that you're creating two different table models.
JTable table = new JTable(data,columnNames);
table.setCellSelectionEnabled(true);
table.setModel(new AbstractTableModel() {...
new JTable(data,columnNames) is actually creating it's own DefaultTableModel based on the information you are providing it. Try removing the table.setModel(new AbstractTableModel() {... code
The other, associated, problem is, I don't know how data and columnNames are declared.
Have a read through How to Use Tables for more details
Updated
The other problem, as pointed about by Hovercraft, is you adding one table to another and then accessing the wrong model.
The table creation should look more like...
tableEntry = new JTable(data,columnNames);
JScrollPane scrollPane = new JScrollPane(tableEntry );
tableEntry .setFillsViewportHeight(true);
// Don't forget to add the scroll pane to you view !!
Then you submit method should look more like...
public void submit(){
String recordvalues = ""; //contains a String representation of what I want to submit
TableModel model = tableEntry.getModel();
for(int a = 0; a < model.getColumnCount();a++){
for(int b = 0; b < model.getRowCount();b++){
if(a != 0){ //I want to skip the first column
recordvalues = recordvalues + (String) model.getValueAt(b, a) + ","; //The error is at this line in the code
}
}
}
}

Exception in thread "AWT-EventQueue-0" java.lang.ArrayIndexOutOfBoundsException: 0 >= 0
This exception means that the column size of your table is 0, I think it's because you don't add columns into your TableModel.
Try to create several TableColumn Column = new TableColumn(); then add these columns to your table

JTable hide and show columns

I want to add some columns to a table (Swing JTable). Some of them will have a default size (e.g. 250), others will be hidden (so their size will be 0). I use this code:
model = new DefaultTableModel();
table = new JTable(model);
setAutoResizeMode(AUTO_RESIZE_OFF);
for (int i = 1; i < COLUMN_NAMES.length; i++) {
model.addColumn(COLUMN_NAMES[i]);
if (show[i]) show(index);
else hide(index);
}
........
private void hide(int index) {
TableColumn column = getColumnModel().getColumn(index);
column.setMinWidth(0);
column.setMaxWidth(0);
column.setWidth(0);
column.setPreferredWidth(0);
doLayout();
}
private void show(int index) {
final int width = 250;
column.setMinWidth(15);
column.setMaxWidth(width);
column.setWidth(width);
column.setPreferredWidth(width);
doLayout();
}
the problem is when the table is displayed, all the columns are showed (none is hidden) and their size is not 250 but they have all the same size.
How can I get the wanted effect?

I think you have named your methods incorrectly, when you want to hide a column you will set
column.setMinWidth(0);
column.setMaxWidth(0);
column.setPreferredWidth(0);
but in your code you are doing this when you want to show a column which is exactly opposite.
Also there is no need to call this "setWidth" method on a TableColumn, read TableColumn#setWidth(int).

JTable#removeColumn remove Column only from JTable view, more in this example

instead of re-inventing the wheel you might consider to use JXTable (in the SwingX project) which supports hidden columns, comlete with a ui-control to allow users hiding/showing them dynamically - and a bunch of other useful thingies :).

try this something like this for example:
myTableModel = new DefaultTableModel();
myTableModel.setColumnIdentifiers(new Object[]{"ID", "Name"});
JTable myTable = new JTable(myTableModel);
// remember to save the references
TableColumn myTableColumn0 = guiLoteryNumbersTable.getColumnModel().getColumn(0);
TableColumn myTableColumn1 = guiLoteryNumbersTable.getColumnModel().getColumn(1);
//...
// remove temporary the column ("hide")
myTable.getColumnModel().removeColumn(myTableColumn1);
// then you restore that column when you need it ("show")
myTable.getColumnModel().addColumn(myTableColumn1);
That's the best way I know to hide a column.

HashMap<String,TableColumn> hashMap_columns = new HashMap<String,TableColumn>();
DefaultTableColumnModel defaultTableColumnModel = (DefaultTableColumnModel)jtable.getColumnModel();
Enumeration<TableColumn> enumeration = defaultTableColumnModel.getColumns();
while (enumeration.hasMoreElements())
{
TableColumn tableColumn = enumeration.nextElement();
hashMap_columns.put((String)tableColumn.getIdentifier(),tableColumn);
}
public void setColumnVisible(String identifier, boolean setVisible)
{
TableColumn tableColumn = hashMap_columns.get(identifier);
if (setVisible)
{
// using a sorted map removes the need to check column index/position
SortedMap<Integer,TableColumn> sortedMap = new TreeMap<Integer,TableColumn>();
// retreive all visible columns
Enumeration<TableColumn> enumeration = defaultTableColumnModel.getColumns();
while (enumeration.hasMoreElements())
{
TableColumn column = enumeration.nextElement();
sortedMap.put(column.getModelIndex(),column);
}
// add the column of interest to the sorted map
sortedMap.put(tableColumn.getModelIndex(),tableColumn);
// remove all visible columns
for (TableColumn column: sortedMap.values())
{
defaultTableColumnModel.removeColumn(column);
}
// add all previously visible columns as well as the column of interest
for (TableColumn column: sortedMap.values())
{
defaultTableColumnModel.addColumn(column);
}
}
else
{
defaultTableColumnModel.removeColumn(tableColumn);
}
}

public class TableColumnHider {
private final JTable table;
private final TableColumnModel tcm;
private final Map hiddenColumns;
public TableColumnHider(JTable table) {
this.table = table;
tcm = table.getColumnModel();
hiddenColumns = new HashMap();
}
public void hide(String columnName, String keySig) {
int index = tcm.getColumnIndex(columnName);
TableColumn column = tcm.getColumn(index);
hiddenColumns.put(columnName, column);
hiddenColumns.put(keySig + columnName, new Integer(index));
tcm.removeColumn(column);
}
public void show(String columnName, String keySig) {
Object o = hiddenColumns.remove(columnName);
if (o == null) {
return;
}
tcm.addColumn((TableColumn) o);
o = hiddenColumns.remove(keySig + columnName);
if (o == null) {
return;
}
int column = ((Integer) o).intValue();
int lastColumn = tcm.getColumnCount() - 1;
if (column < lastColumn) {
tcm.moveColumn(lastColumn, column);
}
}
}