Develop Reference

How to make a JTable entries from outside data?

I'm looking for a way to make data entries for a table from data collected from a SQL database. I have the code made for grabbing the data from the database but I need help with turning that data into table entries

First create an object to represent each row in the table.
public class MyData {
private String name;
private String desc;
//add getters/setters
}
Then you should create a table model
public class MyTableModel extends AbstractTableModel {
List<MyData> list = new ArrayList<>();
public void addRow(MyData data) {
list.add(data);
fireTableRowsInserted(list.size()-1, list.size()-1);
}
//then fill in the required method
public String getColumnName(int col) {
switch (col) {
case 0:
return "Name";
case 1:
return "Description";
}
return "";
}
public int getRowCount() {
return list.size();
}
public int getColumnCount() {
return 2; //or however many columns you need
}
public Object getValueAt(int row, int col) {
MyData data = list.get(row);
if (col == 0) {
return data.getName();
} else if (col == 1) {
return data.getDesc();
}
return null;
}
}
Then use that model in your table;
MyTableModel tableModel = new MyTableModel();
JTable table = new JTable(tableModel);
Then you you can read data from the database you just have to call
tableModel.add(data);

netbeans - Custom table model not showing in design view

I'm trying to use a custom TableModel in my java desktop application. The GUI has been made using NetBeans.
But the thing is when I use the DefaultTableModel then I can see my table in the design view of the GUI.
But when I use my custom TableModel then It is not displayed in the design view, although it is displayed when I run the application.
What seems to be the problem?
Custom Table Model Code
public class BillingTableModel extends AbstractTableModel implements TableModel {
String columnNames[] = {
"Name", "Address", "1", "2", "3"
};
Object data[][] = {
{null,null,null,null,null},
{null,null,null,null,null},
{null,null,null,null,null},
{null,null,null,null,null},
{null,null,null,null,null}
};
Class types[] = new Class [] {
String.class, String.class, String.class, String.class, String.class
};
#Override
public Class<?> getColumnClass (int columnIndex) {
return types[columnIndex].getClass();
}
#Override
public String getColumnName(int column) {
return columnNames[column];
}
#Override
public int getRowCount() {
return data.length;
}
#Override
public int getColumnCount() {
return columnNames.length;
}
#Override
public Object getValueAt(int row, int col) {
return data[row][col];
}
#Override
public boolean isCellEditable (int row, int col) {
if (col >= 2)
return true;
else
return false;
}
#Override
public void setValueAt(Object value, int row, int col) {
data[row][col] = value;
fireTableCellUpdated(row, col);
}
}
I edited the default code to include my class like this
customerTable = new javax.swing.JTable();
customerTable.setModel(new BillingTableModel());
tableScrollPane.setViewportView(customerTable);

Subclass JTable and then you can drag your custom JTable to the Netbeans designer instead of a regular JTable and your custom model will already be visible.
eg.
Put this file in your project as CustomerTable.java
public class CustomerTable extends JTable {
public CustomerTable() {
this.setModel(new BillingTableModel());
}
}
Select the file and choose Run -> Compile File from the Menu. (or press F9)
Delete the JTable you have from your the Netbeans Design view, and drag CustomerTable.java from the projects window into the design view instead.

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.

TableModel - Doesn`t show anything in the gui?

I am fetching the data from the DAO to the GUI level.
When I want to load the Table I get an empty table only with the right row count of the clicked db symbol:
To load the elements I use:
playlistTable.addMouseListener(new MouseAdapter() {
public void mouseClicked(MouseEvent e) {
if (e.getClickCount() == 1) {
JTable target = (JTable)e.getSource();
int row = target.getSelectedRow();
playlistTableModel.setPlaylists(playlistService.getMoviesOfPlaylist(row));
}
Why is the Table empty?
UPDATE
Table model code:
public class PlaylistTableModel extends AbstractTableModel {
/**
* Generated UID
*/
private static final long serialVersionUID = 9058516120594137393L;
/**
* List of playlist to be shown
*/
private List<Playlist> playlist;
public PlaylistTableModel(List<Playlist> playlist){
this.playlist=playlist;
}
public int getColumnCount() {
return 1;
}
public int getRowCount() {
return playlist.size();
}
public Object getValueAt(int arg0, int arg1) {
Playlist playlists = playlist.get(arg0);
switch(arg1){
case 0: return playlists.getName();
default: return null;
}
}
public void setPlaylists(List<Playlist> playlist){
this.playlist=playlist;
fireTableDataChanged();//Aktualisiert Playlist automatisch
}
public void setPlaylist(Playlist playlists){
playlist.add(playlists);
fireTableRowsInserted(playlist.size()-1, playlist.size()-1);
}
public String getColumnName(int column) {
if(column==0){
return "Playlist";
}
else{
return null;
}
}
/**
* Returns a movie from the list specified by the index
* #param row index of the movie
* #return movie
*/
public Playlist getPlaylist(int row){
return playlist.get(row);
}
#Override
public boolean isCellEditable(int row, int col) {
return true;
}
#Override
public void setValueAt(Object aValue, int rowIndex, int columnIndex){
if(columnIndex!=0){
return;
}
fireTableCellUpdated(rowIndex, columnIndex);
}

This method may be the problem,
public void setPlaylist(Playlist playlists){
playlist.add(playlists);
fireTableRowsInserted(playlist.size()-1, playlist.size()-1);
}
Here for example if we got the playlists with size 20. Then after assigning to the table model playlist you are calling,
fireTableRowsInserted(playlist.size()-1, playlist.size()-1);
which will reduce to,
fireTableRowsInserted(19, 19);
But actually what has happened is we are not just inserting one row but 20 rows. So as suggested by #Ivan.Latysh in the answer section, you need to call insert from the start of the row count to the end of the row count. This will repaint the inserted rows.
P.S: You can simply call fireTableDataChanged(); method also. But this method will repaint entire table. Prefer this method only if the entire table list is changed. Else you have respective fireXX methods for Insertion, Update, Delete.

Probably issue is in getValueAt method, change like this
public Object getValueAt(int arg0, int arg1) {
// since you use only one column
return playlist.get(arg0).getName();
}

The issue is that you are firing a wrong change event
fireTableRowsInserted(playlist.size()-1, playlist.size()-1);
Docs state:
public void fireTableRowsInserted(int firstRow,
int lastRow)
Notifies all listeners that rows in the range [firstRow, lastRow], inclusive, have been inserted.
So if you want to be optimal, do this:
public void setPlaylist(Playlist playlists){
int firstRow = playlist.size();
playlist.add(playlists);
fireTableRowsInserted(firstRow, playlist.size()-1);
}
Or simply re-draw entire table. Don't forget that table also may re-calculate its sizes.
fireTableDataChanged();

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.