Develop Reference

JTable's setValueAt() method is not updating cell data

I have created a JTable using Abstract Table Model. This table has a two dimensional array of Integer object data and one 1 dimensional column header.Everything works fine except when I edit & change the cell data during program's runtime, it reverts back to the default value (created with getValueAt()). I have implemented Abstract Table Models setValueAt() method but it does not work.
Can anyone please tell me whats is wrong in my code?
import javax.swing.table.AbstractTableModel;
public class TableModel1 extends AbstractTableModel {
/**
*
*/
private static final long serialVersionUID = 1L;
String [] colNames=new String[30];
Object[][] data= new Integer[4][30];
#Override
public int getColumnCount() {
return colNames.length;
}
#Override
public int getRowCount() {
return 4;
}
public String getColumnName(int col){
if (col==0){
colNames[0]="Boarders";
}
else if(col>0){
for(int i=1;i<colNames.length;i++){
colNames[i]=new String(""+i);
}
}
return colNames[col];
}
#Override
public Object getValueAt(int row, int col) {
for(int i=0; i<data.length;i++){
for(int j=0; j<data[i].length;j++){
data[i][j]=new Integer(1);
}
}
return data[row][col];
}
public Class getColumnClass(int c) {
return getValueAt(0, c).getClass();
}
public boolean isCellEditable(int row, int col){
return true;
}
public void setValueAt (Object aValue, int row, int col){
data[row][col]=(Integer)aValue;
fireTableCellUpdated(row,col);
}
}//end class

Seems that happens because when getValueAt() method invokes, you always refresh data in your array with next lines:
for(int i=0; i<data.length;i++){
for(int j=0; j<data[i].length;j++){
data[i][j]=new Integer(1);
}
}
So, remove this lines from getValueAt() method, and initialize your array in constructor of your model only once not every time as now.

the problem is in the getValueAt . those methods are constantly called. its not a one time thing. initiate the values outside of the table model

Not able to get the correct row from a JTable after Sorting it (Swing)

I got an AbstractTableModel, like this:
public class TableModelClienteFornecedor extends AbstractTableModel {
private List<ClienteFornecedorDTO> linhas;
private String[] colunas = new String[]{"Nome", "Conta"};
public TableModelClienteFornecedor() {
linhas = new ArrayList<>();
}
#Override
public int getRowCount() {
return linhas.size();
}
#Override
public int getColumnCount() {
return colunas.length;
}
#Override
public String getColumnName(int column) {
return colunas[column];
}
#Override
public Class getColumnClass(int column) {
return (getValueAt(0, column).getClass());
}
#Override
public Object getValueAt(int rowIndex, int columnIndex) {
ClienteFornecedorDTO cf = linhas.get(rowIndex);
switch (columnIndex) {
case 0:
return cf.getNome();
case 1:
return cf.getConta();
default:
throw new IndexOutOfBoundsException("Coluna incorreta");
}
}
public void clear(JTable table) {
table.setRowSorter(null);
int indiceAntigo = this.getRowCount();
linhas.clear();
int indiceNovo = this.getRowCount();
this.fireTableRowsDeleted(indiceAntigo, indiceNovo);
}
public boolean isEmpty() {
return linhas.isEmpty();
}
public void add(ClienteFornecedorDTO cf) {
linhas.add(cf);
int index = this.getRowCount();
fireTableRowsInserted(index, index);
}
public void addList(List<ClienteFornecedorDTO> list, JTable table) {
int tamanhoAntigo = this.getRowCount();
linhas.addAll(list);
int tamanhoNovo = this.getRowCount() - 1;
this.fireTableRowsInserted(tamanhoAntigo, tamanhoNovo);
table.setAutoCreateRowSorter(true);
}
public ClienteFornecedorDTO get(int i) {
return linhas.get(i);
}
}
And the code below works ok to fill the my Jtable with data:
private void realizarBusca(String nome) {
IContaDAO dao = new ContaDAO();
boolean isFornecedor = radioFornecedor.isSelected();
List<ClienteFornecedorDTO> retorno =
dao.retornaContaClienteFornecedor(isFornecedor, nome);
tableModelClienteFornecedor.clear();
tableModelClienteFornecedor.addList(retorno, tableClienteFornecedor);
tableClienteFornecedor.updateUI();
}
Everything's working fine to me, and when I sort my Jtable visibily it's ok too, the problem is when I click on a specific row from my Jtable after I sorted it, the row it's not updated.
Anyone can help me with that?
I would appreciate, 'cause I'm on it since yesterday and still wasn't able to find a way to solve it.

Look at the methods convertRowIndexToModel() and convertRowIndexToView() in JTable.
When the table is sorted, the indices of the rows in the view don't match with the indices in the model anymore, and you have to use the above methods to convert from index to view and vice-versa.
For example, if you call JTable.getSelectedRow(), you'll get the view index of the selected row. You'll have to convert it to the model index (using convertRowIndexToModel()) to be able to get the selected object from the list in your model.

Create custom table model with column header in java

I'm developing a software for my friend.I have developed 90% of my project and my problem is I have a table which I fill with data in database.I have used a custom table model to fill jtable. It fills data perfectly but the problem is it doesn't contain proper column header instead of that it contain A,B,C for column headers .
here is my custom table model class.
public class SellUpdateModel extends AbstractTableModel
{
private Vector<Vector> data;
public SellUpdateModel(String Jid)
{
data = new Vector<>();
data = new JobDetailsDAO().get_ItemDescriptionAndQuantity(Jid); //Retrive data from databse and fill it to vector.
}
#Override
public boolean isCellEditable(int rowIndex, int columnIndex)
{
return false; // does not allowed to edit cells
}
#Override
public int getRowCount()
{
return data.size();
}
#Override
public int getColumnCount()
{
return 3;
}
#Override
public Object getValueAt(int rowIndex, int columnIndex)
{
return data.elementAt(rowIndex).elementAt(columnIndex);
}
public SellUpdateModel deleteRow(int row, Vector pData)
{
data.remove(data.elementAt(row)); // remove a record from vector
data.add(pData); // add a record to vector
return this;
}
}

You have to override getColumnName(int columnIndex).
public class SellUpdateModel extends AbstractTableModel {
private final String[] tableHeaders = {"X", "Y", "Z"};
#Override
public String getColumnName(int columnIndex) {
return tableHeaders[columnIndex];
}
}

Output the content of a LinkedHasHSet into a JTable

I have a LinkedHashSet of Book objects. The Book objects have the following fields:
private int id;
private String author = "";
private String title = "";
private boolean isRead;
private String dateStamp = "";
private static int counter = 0;
I want them to go into my JTable which has the following columns:
String [] columnNames = {"ID","Title", "Author", "Status", "Date Read"};
How can I do this? And is it possible to have the isRead field being editable through a checkbox in the table?

You need to have a class that extends AbstractTableModel. This class should use your LinkedHashSet as the data source for your table. The basic implementation provided by AbstractTableModel should suit most of your needs. If not, then you can override the methods you need to customize.
This tutorial should help you understand how JTable objects work.

This is a sample model I have created for the table.
public class CustomModel extends AbstractTableModel {
private Object[] colNames ={"ID","Title", "Author", "Status", "Date Read"};
private LinkedHashSet<CustomClass> data;
public TableModelTop() {
this.data = getDataForDropList();
}
public int getRowCount() {
return data.size();
}
public int getColumnCount() {
return colNames.length;
}
#Override
public String getColumnName(int columnIndex) {
return (String) colNames[columnIndex];
}
#Override
public void setValueAt(Object aValue, int rowIndex, int columnIndex) {
// Set Values here;
}
public Object getValueAt(int rowIndex, int columnIndex) {
// Get row Values here;
}
#Override
public boolean isCellEditable(int rowIndex, int columnIndex) {
return true;
}
#Override
public Class<?> getColumnClass(int columnIndex) {
// Depending on the type of the column. Return data type;
}
/**
* Populate the data from here.
* #return LinkedHashSet<CustomClass>
*/
private LinkedHashSet<CustomClass> getDataForDropList() {
LinkedHashSet<CustomClass> modelList = new LinkedHashSet<CustomClass>();
for(int i = 0; i< 5; i++) {
// Create custom Object and add them to the LinkedHashSet.
// Create a CustomClass object and add it to the LinkedHashSet
modelList.add(customClassObject);
}
// Finally return the llinkedhashset
return modelList;
}
}
After this just call the table model and assign this to the JTable.
JTable table = new JTable(new CustomModel());

As a concrete example of using AbstractTableModel, you can leverage the toArray() method inherited by LinkedHashSet to simplify the implementation of getValueAt(), as shown in this related EnvTableTest. The default JTable renderer and editor use JCheckBox for TableModel elements of type Boolean.class, as shown in this example.

HowTo Remove a Row in a JTable with a Custom TableModel

I've been reading posts similar to mine, and reading through the Java tutorial page but I just can't seem to get this working. I'm not sure if I'm missing something fundamental or not...
I have a custom table model below that I need to be able to delete rows from. The table is initialized empty and rows are added through a combo box and an add button. There is also a delete button that needs to delete the selected row out of the table.
class TableModel extends AbstractTableModel
{
private String[] columnNames = {"Enabled", "Value" };
protected Class[] columnClasses = new Class[] { Boolean.class, String.class };
public int getColumnCount() { return columnNames.length; }
public int getRowCount() { return filters.size(); }
public String getColumnName(int col) { return columnNames[col]; }
public Class getColumnClass(int col) { return columnClasses[col]; }
public Object getValueAt(int row, int col) { ... }
public void setValueAt(Object value, int row, int col) { ... }
public void addRow(String value)
{
fireTableRowsInserted(filters.size() - 1, filters.size() - 1);
int row = filters.size() -1 ;
int col = 1;
setValueAt(value, row, col);
}
public void removeRow(int row)
{
fireTableRowsDeleted(selectedRow, selectedRow);
}
}
I have confirmed that selectedRow contains the correct row through prints in the console. The fireTableRowsDeleted function just doesn't do anything. The row still exists. How do you just delete a specific row?
Thanks,

The call to fireTableRowsDeleted simply fires off the event to indicate rows have been deleted, you still need to actually remove them from the model.

Immediately after I posted this I figured it out.
The rows contents are based on a List of filters:
public int getRowCount() { return filters.size(); }
My problem was I was trying to delete a row without removing that from the list. So I modified removeRow() to be the following:
public void removeRow(int row)
{
filters.remove(row);
fireTableRowsDeleted(row, row);
}
And it works like a charm.
cheers

I think this is the answer:
final int row = selectedRow;
EventQueue.invokeLater(new Runnable() {
public void run() {
model.removeRow(row);
}
});
The row will be deleted when the editing is finished.