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Java jTable compute each row

can anybody here help me on how to compute rows in jtable?
assuming that i have a table containing fields date, description, aCCount, SCount and lost , i have loaded the four field from database except lost field because i want to compute it on runtime, can anybody help me? here is image attach for clarification
public void cha(){
ArrayList<Chalsim> list = getChalsim();
DefaultTableModel model = (DefaultTableModel) jTable1.getModel();
Object[] row = new Object[4];
for(int i =0; i<list.size(); i++){
row[0] = list.get(i).getDate();
row[1] = list.get(i).getDesc();
row[2] = list.get(i).getAc();
row[3] = list.get(i).getSc();
model.addRow(row);
}
}

You can extend AbstractTableModel,and then assign it to JTable
new AbstractTableModel() {
public String getColumnName(int col) {
return columnNames[col].toString();
}
public int getRowCount() { return rowData.length; }
public int getColumnCount() { return columnNames.length; }
public Object getValueAt(int row, int col) {
return rowData[row][col];
}
public boolean isCellEditable(int row, int col)
{ return true; }
public void setValueAt(Object value, int row, int col) {
rowData[row][col] = value;
fireTableCellUpdated(row, col);
}
}
and then put it into JTable
JTable table = new JTable(new MyTableModel());

ImageIcon in JTableCell

I am having an issue adding an ImageIcon to my JLabel in my JTable. So far I am entirely able to manipulate the cell based on the value of the data in the cell however whenever I try to add in an image I am only seeing the text.
Table Renderer
class DeviceTableModel extends AbstractTableModel {
private Object[][] data = Globals.getArray();
private String[] columnNames = {"Name","Status","Description"};
#Override
public int getRowCount() {
return data.length;
}
#Override
public int getColumnCount() {
return columnNames.length;
}
#Override
public Object getValueAt(int rowIndex, int columnIndex) {
return data[rowIndex][columnIndex];
}
#Override
public String getColumnName(int col) {
return columnNames[col];
}
#Override
public Class getColumnClass(int c) {
return getValueAt(0,c).getClass();
}
#Override
public void setValueAt(Object value, int row, int col) {
data[row][col] = value;
fireTableCellUpdated(row,col);
}
}
This is the Renderer I am using in my JTable.
#Override
public Component prepareRenderer(TableCellRenderer renderer, int row, int col) {
JLabel comp = (JLabel)super.prepareRenderer(renderer, row, col);
Object value = getModel().getValueAt(row, col);
if (value.equals("online")) {
comp.setIcon(new ImageIcon("/Res/online.png"));
comp.setBackground(Color.green);
}else {
comp.setBackground(Color.white);
}
return comp;
}
The color and text set just fine but the icon will not display. Any ideas would be appreciated!
EDIT- Suggestions by VGR and Camickr
Your advice was spot on and resolved the issue! Take a look at the redone portion. I am very grateful. Thanks guys!
//preloaded just added here to show.
ImageIcon icon = new ImageIcon(getClass().getResource("/Res/onlineIcon.png"));
#Override
public Component prepareRenderer(TableCellRenderer renderer, int row, int col) {
JLabel comp = (JLabel)super.prepareRenderer(renderer, row, col);
Object value = getModel().getValueAt(row, col);
if (value.equals("online")) {
comp.setIcon(icon);
comp.setBackground(new Color(173,255,92));
}else {
comp.setIcon(null);
comp.setBackground(Color.white);
}
return comp;
}
}

The ImageIcon constructor documentation makes it clear that the string argument is a filename. Unless your system has a Res directory in the root of the file system, you probably meant to do new ImageIcon(getClass().getResource("/Res/online.jpg")) or new ImageIcon(getClass().getResource("/online.jpg")).
Note that your else clause should be setting the icon to null, since a single renderer may be used for multiple table cells.

JTable with varying column length

I'm trying to read a csv file and get it setup to convert into another format to save some time at work, but the JTable i'm loading it into throws an exception when a row has a length less than the expected column. Is there a method to create an empty cell if row length < column length?
here is the table model:
private class CSVTableModel extends AbstractTableModel{
private ArrayList<String[]> list;
private String[] columns;
public CSVTableModel() {
this.list = p.getData();
this.columns = p.getHeaders();
}
#Override
public String getColumnName(int col) {
return columns[col];
}
#Override
public int getRowCount() {
return list.size();
}
#Override
public int getColumnCount() {
return columns.length;
}
#Override
public Object getValueAt(int row, int col) {
return list.get(row)[col];
}
#Override
public void setValueAt(Object value, int row, int col) {
list.get(row)[col] = (String) value;
this.fireTableCellUpdated(row, col);
}
}
So you can see with the getValueAt(int row, int col) method it will cause an error if the col exceeds the String[].length.

I literally solved it after posting. Rubber duck debugging.
#Override
public Object getValueAt(int row, int col) {
if ( col < list.get(row).length ) {
return list.get(row)[col];
} else {
return "";
}
}
added a condition and works fine now. Should've seen it before.

How do I make a JTable editable in java

I'm using a JTable in java, but it won't let me edit the cells.
private final TableModel dataModel = new AbstractTableModel() {
public int getColumnCount() {
return 5;
}
public int getRowCount() {
return 10;
}
public Object getValueAt(int row, int col) {
return new Integer(row*col);
}
};
private final JTable table = new JTable(dataModel);

add the follwoing code
public boolean isCellEditable(int row, int col)
{ return true; }
public void setValueAt(Object value, int row, int col) {
rowData[row][col] = value;
fireTableCellUpdated(row, col);
}
you should have a array where you will save the changes

Add isCellEditable() function inside the anonymous inner class AbstractTableModel
public boolean isCellEditable(int row, int col) {
return true;
}

Try
private final TableModel dataModel = new AbstractTableModel() {
public int getColumnCount() {
return 5;
}
public int getRowCount() {
return 10;
}
public Object getValueAt(int row, int col) {
return new Integer(row*col);
}
public boolean isCellEditable(int row, int col) {
return true;
}
};

Add isCellEditable() to the rows and columns you want them to be editable, example if you don't want some columns like ID to be editable return false. Keep in mind that you need to save the editit data some where
public boolean isCellEditable(int row, int col) {
return true; // or false for none editable columns
}
public void setValueAt(Object value, int row, int col) {
rowData[row][col] = value; // save edits some where
fireTableCellUpdated(row, col); // informe any object about changes
}

get cells odf a JTable

how to display a row of a jtable in a from of JTextField when click on the row,
( I need this to edit the data base from the JTable )
My table model
static class TableDataModel extends AbstractTableModel
{
private List nomColonnes;
private List tableau;
public TableDataModel(List nomColonnes, List tableau){
this.nomColonnes = nomColonnes;
majDonnees(tableau);
}
public void majDonnees(List nouvellesDonnees){
this.tableau = nouvellesDonnees;
fireTableDataChanged();
}
public int getRowCount(){
return tableau.size();
}
public int getColumnCount(){
return nomColonnes.size();
}
public Object getValueAt(int row, int col){
return ((ArrayList)( tableau.get(row))).get(col);
}
public String getColumnName(int col){
return nomColonnes.get(col).toString();
}
public Class getColumnClass(int c)
{
return getValueAt(0,c).getClass();
}
public boolean isCellEditable(int row, int col){
return true;
}
public void setValueAt(Object value, int row, int col)
{
((List)tableau.get(row)).set(col,value);
fireTableCellUpdated(row, col);
//i suppose i should update the database here
}
}

Use a ListSelectionListener. Whenever a row is selected you get the data from the model for the given row using table.getValueAt(...) and then you display the data in the text field of your form.