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change color JTable cells with getTableCellRendererComponent NOTHING HAPPENDS

I am trying to change the color of some cells in my JTable. I have tried to override getTableCellRendererComponent in a simple example, and it works nice. But when I do the same in my project nothing changes...
I have my JPanel with my JTable in a Box like this:
boxTable=Box.createHorizontalBox();
box2Table.add(boxTable);
//JTable
tablaContador = new JTable(datosContador,cabeceraContador);
//MODIF COLOR
tablaContador.setDefaultRenderer(Object.class, new ColorRenderer());
Doing:
System.out.println(tablaContador.getColumnClass(3));
I can know that the first parameter of setDefaultRenderer is Object.class
I don't know if the problem is here... i have only strings in the Table, but I have tried String.class and nothing happens
Then I modify some things of JTable's Cells:
tablaContador.setAutoResizeMode(JTable.AUTO_RESIZE_OFF);
boxTable.add(tablaContador);
//Align cells
for (int i=0; i<cabeceraContador.length;i++){
tablaContador.getColumnModel().getColumn(i).setCellRenderer(alinearCeldas);
}
//Modify cells' width
tablaContador.getColumnModel().getColumn(0).setMinWidth(150);
for (int i=1; i<cabeceraContador.length;i++){
tablaContador.getColumnModel().getColumn(i).setMaxWidth(40);
}
//Scroll for the Table
scrollContador=new JScrollPane(tablaContador,JScrollPane.VERTICAL_SCROLLBAR_NEVER,JScrollPane.HORIZONTAL_SCROLLBAR_NEVER);
scrollContador.setPreferredSize(new Dimension(1000,80));
scrollContador.setMinimumSize(new Dimension(1000,80));
scrollContador.setMaximumSize(new Dimension(2000,80));
//Add scroll to the box
box2Table.add(scrollContador);
And my ColorRenderer class is:
public class ColorRenderer extends DefaultTableCellRenderer{
private Component c;
#Override
public Component getTableCellRendererComponent(JTable table, Object value, boolean isSelected, boolean hasFocus,int row, int column) {
c = super.getTableCellRendererComponent(table, value, isSelected, hasFocus, row, column);
c.setBackground(Color.BLUE);
return c;
}
}
Table result
So It does not work in my project i don't know why
any idea?
thaks!

I see:
tablaContador.setDefaultRenderer(Object.class, new ColorRenderer());
and then I see:
for (int i=0; i<cabeceraContador.length;i++)
{
tablaContador.getColumnModel().getColumn(i).setCellRenderer(alinearCeldas);
}
The assignment of the renderer to a specific column takes precedence over setting the default renderer so your color renderer is never used.
Not exactly what you are trying to do, but I would guess you need to add the color rendering logic to the alignment renderer. In other words all the rendering logic must be contained in a single renderer. You can't merge multiple renderers.
Here is a simple example of a custom renderer:
import java.awt.*;
import javax.swing.*;
import javax.swing.table.*;
public class TableRenderer extends JPanel
{
public TableRenderer()
{
String[] columnNames = {"String", "Integer"};
Object[][] data =
{
{"A", new Integer(1)},
{"B", new Integer(2)},
{"C", new Integer(10)},
{"D", new Integer(4)}
};
DefaultTableModel model = new DefaultTableModel(data, columnNames);
JTable table = new JTable( model );
table.setPreferredScrollableViewportSize(table.getPreferredSize());
JScrollPane scrollPane = new JScrollPane( table );
add( scrollPane );
// Override default renderer on a specific column
TableCellRenderer colorRenderer = new ColorRenderer();
table.getColumnModel().getColumn(1).setCellRenderer( colorRenderer );
}
/*
** Color the focused cell
*/
class ColorRenderer extends DefaultTableCellRenderer
{
public ColorRenderer()
{
super();
setHorizontalAlignment(JLabel.RIGHT);
}
#Override
public Component getTableCellRendererComponent(
JTable table, Object value, boolean isSelected, boolean hasFocus, int row, int column)
{
super.getTableCellRendererComponent(table, value, isSelected, hasFocus, row, column);
if (isSelected)
setBackground( table.getSelectionBackground() );
else
{
setBackground( null );
try
{
int number = Integer.parseInt( value.toString() );
if (number > 9)
setBackground( Color.RED );
}
catch(Exception e) {}
}
return this;
}
}
private static void createAndShowGUI()
{
JFrame frame = new JFrame("Color Renderer");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.add(new TableRenderer());
frame.pack();
frame.setLocationByPlatform( true );
frame.setVisible( true );
}
public static void main(String[] args)
{
EventQueue.invokeLater( () -> createAndShowGUI() );
/*
EventQueue.invokeLater(new Runnable()
{
public void run()
{
createAndShowGUI();
}
});
*/
}
}

How to set cell background and decimal format together during cell selection

I am sorry if the title is not explanatory enough.
I have written a small extension to DefaultTableRenderer class in Java in order to specify cellBackgourd, cellForeground, Alignment and decimal control. I using this class in matlab to control and customise JIDE tables. But have re-created the issue in Java, in order to increase chances of a reply or a possible workaround.
I am successfully able to set cell Background, Foreground, alignment and decimal places as required when the table initialises and displays. However, as soon as I select a row/cell I loose decimal control on displayed data as shown in figure below. Please note that I am using specific cell selection colours, I guess, I am not implementing it properly.
I think, the problem is one of last two lines:
return super.getTableCellRendererComponent(table, value, isSelected, hasFocus, row, column);
or
return cell;
Java code:
import java.awt.*;
import java.text.DecimalFormat;
import javax.swing.*;
import javax.swing.table.*;
public class DecimalPlacesInTable extends JFrame {
public static void main( String[] args ) {
DecimalPlacesInTable frame = new DecimalPlacesInTable();
frame.setDefaultCloseOperation( EXIT_ON_CLOSE );
frame.pack();
frame.setVisible( true );
}
public DecimalPlacesInTable() {
Object[] columnNames = { "A", "B", "C" };
Object[][] data = {
{new Double( 850.503 ), new Double( 850.545 ), new Double( 80.54553 ) },
{new Double( 50.52503 ), new Double( 36.4554 ), new Double( 50.41453 ) },
{new Double( 80.544653 ), new Double( 8.3 ), new Double( 80.4553 ) },
{new Double( 50.1553 ), new Double( 246.0943 ), new Double( 50.455 ) }};
JTable table = new JTable(data, columnNames);
// Tell the table what to use to render our column of doubles
for (int i=0; i<3; i++) {
table.getColumnModel().getColumn(i).setCellRenderer(new DecimalFormatRenderer());
getContentPane().add(new JScrollPane(table));
}
}
// Custom Renderer class
static class DecimalFormatRenderer extends DefaultTableCellRenderer
{
public Component getTableCellRendererComponent
(JTable table, Object value, boolean isSelected, boolean hasFocus, int row, int column) {
JComponent cell = (JComponent) super.getTableCellRendererComponent
(table, value, isSelected, hasFocus, row, column);
// set color
cell.setBackground(new Color(0xC8C8C8));
cell.setForeground(new Color(0xFFFFFF));
//set Alignment
((JLabel) cell).setHorizontalAlignment(SwingConstants.CENTER);
//set selection colors
if (isSelected) {
cell.setBackground(new Color(0x3399FF));
cell.setForeground(new Color(0x000000)); // AM
} else {
// set decimals
DecimalFormat DecimalFormatter = new DecimalFormat("#.00");
value = DecimalFormatter.format(value);
return super.getTableCellRendererComponent(table, value, isSelected, hasFocus, row, column);
}
return cell;
}
}
}

From Concepts: Editors and Renderers - How to Use Tables (The Java? Tutorials > Creating a GUI With JFC/Swing > Using Swing Components)
It is easy to customize the text or image rendered by the default renderer, DefaultTableCellRenderer. You just create a subclass and implement the setValue method so that it invokes setText or setIcon with the appropriate string or image. For example, here is how the default date renderer is implemented:
import java.awt.*;
import java.text.DecimalFormat;
import javax.swing.*;
import javax.swing.table.*;
public class DecimalPlacesInTable2 extends JFrame {
public static void main(String[] args) {
EventQueue.invokeLater(() -> {
DecimalPlacesInTable2 frame = new DecimalPlacesInTable2();
frame.setDefaultCloseOperation(EXIT_ON_CLOSE);
frame.pack();
frame.setVisible(true);
});
}
public DecimalPlacesInTable2() {
Object[] columnNames = { "A", "B", "C" };
Object[][] data = {
{850.503, 850.545, 80.54553},
{50.52503, 36.4554, 50.41453},
{80.544653, 8.3, 80.4553},
{50.1553, 246.0943, 50.455}
};
//JTable table = new JTable(data, columnNames);
TableModel model = new DefaultTableModel(data, columnNames) {
#Override public Class<?> getColumnClass(int column) {
return Double.class;
}
};
JTable table = new JTable(model);
// Tell the table what to use to render our column of doubles
for (int i = 0; i < 3; i++) {
table.getColumnModel().getColumn(i).setCellRenderer(new DecimalFormatRenderer());
//getContentPane().add(new JScrollPane(table));
}
getContentPane().add(new JScrollPane(table));
}
// Custom Renderer class
static class DecimalFormatRenderer extends DefaultTableCellRenderer {
private final DecimalFormat formatter = new DecimalFormat("#.00");
#Override public Component getTableCellRendererComponent(
JTable table, Object value, boolean isSelected, boolean hasFocus,
int row, int column) {
JLabel cell = (JLabel) super.getTableCellRendererComponent(
table, value, isSelected, hasFocus, row, column);
//set Alignment
cell.setHorizontalAlignment(SwingConstants.CENTER);
//set selection colors
if (isSelected) {
cell.setBackground(new Color(0x3399FF));
cell.setForeground(new Color(0x000000)); // AM
} else {
// set color
cell.setBackground(new Color(0xC8C8C8));
cell.setForeground(new Color(0xFFFFFF));
}
// // set decimals
// if (value instanceof Double) {
// cell.setText(formatter.format(value));
// }
return cell;
}
#Override public void setValue(Object value) {
setText(value instanceof Double ? formatter.format(value) : "");
}
}
}

Color JTable row

I use TableCellRenderer in a function to change the color of a row.
public void change_color(JTable tableName){
tableName.setDefaultRenderer(Object.class, new TableCellRenderer(){
private DefaultTableCellRenderer DEFAULT_RENDERER = new DefaultTableCellRenderer();
#Override
public Component getTableCellRendererComponent(JTable table, Object value, boolean isSelected, boolean hasFocus, int row, int column) {
Component c = DEFAULT_RENDERER.getTableCellRendererComponent(table, value, isSelected, hasFocus, row, column);
c.setBackground(Color.RED);
//Add below code here
return c;
}
});
}
It changes the color of entire table. To call this function i use following condition.
if(ellapsed.getMinutes() > 30)
{
change_color(table_dineIn,ellapsed.getMinutes());
}
Cant figure out the problem. I have tried other codes to but nothing helped me.

The cell renderers in JTable, JList etc. are used like a stamp (see Editors and Renderers for details).
This means that usually, the same (identical) JComponent is used for painting all the cells. This component is only filled with the appropriate contents before it is used for painting the cell. And when the background is set to RED, it will remain red until it is set to a different color.
I'm not sure what you wanted to achieve by using this DEFAULT_RENDERER instance. You could simply inherit from DefaultTableCellRenderer and return the component (which is in fact the renderer itself) direcly. However, in any case, you'll have to include some code that makes sure that the appropriate color is set for every call, roughly like
....
if (shouldBeRed(row, column)) {
c.setBackground(Color.RED);
} else {
c.setBackground(notRed);
}
return c;
(note that this can actually be hidden in the call to the super method if you extend DefaultTableCellRenderer, but the details here depend on whether you'll keep this DEFAULT_RENDERER instance or not...)
You might also be interested in this example of blinking table cells, showing how several table cells may be assigned different colors based on certain criteria.
EDIT: An example. Although I usually try to avoid answereing questions like this with examples like this, because even for the slightest modification, you'll ask another question, which in this case will probably in the line of
how to un-highlight the row
how to highlight multiple rows
how to highlight multiple rows with different colors
...
You'll find answers to all these questions in https://stackoverflow.com/a/24556135/3182664 - in the meantime, I'll mark this question as a duplicate.
import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.Component;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JScrollPane;
import javax.swing.JTable;
import javax.swing.SwingUtilities;
import javax.swing.table.DefaultTableCellRenderer;
public class TableRowColor
{
public static void main(String[] args)
{
SwingUtilities.invokeLater(new Runnable()
{
public void run()
{
createAndShowGUI();
}
});
}
private static void createAndShowGUI()
{
JFrame frame = new JFrame("TableRowColor");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.getContentPane().setLayout(new BorderLayout());
final JTable table = createTable();
JScrollPane scrollPane = new JScrollPane(table);
frame.getContentPane().add(scrollPane, BorderLayout.CENTER);
JButton changeColorButton = new JButton("Change color");
changeColorButton.addActionListener(new ActionListener()
{
#Override
public void actionPerformed(ActionEvent e)
{
changeColor(table, 1);
}
});
frame.getContentPane().add(changeColorButton, BorderLayout.SOUTH);
frame.pack();
frame.setLocationRelativeTo(null);
frame.setVisible(true);
}
private static JTable createTable()
{
String[] columnNames = { "First Name", "Last Name", "Sport", };
Object[][] data = { { "Kathy", "Smith", "Snowboarding" },
{ "John", "Doe", "Rowing" }, { "Sue", "Black", "Knitting" },
{ "Jane", "White", "Speed reading" }, { "Joe", "Brown", "Pool" } };
return new JTable(data, columnNames);
}
public static void changeColor(JTable table, final int coloredRow)
{
table.setDefaultRenderer(Object.class, new DefaultTableCellRenderer()
{
#Override
public Component getTableCellRendererComponent(JTable table,
Object value, boolean isSelected, boolean hasFocus, int row,
int column)
{
super.getTableCellRendererComponent(table, value, isSelected,
hasFocus, row, column);
if (row == coloredRow)
{
setBackground(Color.RED);
}
else
{
setBackground(null);
}
return this;
}
});
table.repaint();
}
}

The following would color 30th row of the table:
public void change_color(JTable tableName){
tableName.setDefaultRenderer(Object.class, new TableCellRenderer(){
private DefaultTableCellRenderer DEFAULT_RENDERER = new DefaultTableCellRenderer();
#Override
public Component getTableCellRendererComponent(JTable table, Object value, boolean isSelected, boolean hasFocus, int row, int column) {
Component c = DEFAULT_RENDERER.getTableCellRendererComponent(table, value, isSelected, hasFocus, row, column);
if (row == 30) {
c.setBackground(Color.RED);
}
return c;
}
});
}
Edit:
If you want to choose table color based on data, add that data to the the table model (e.g. a Time stored in particular column), then use the model in the renderer. For example:
static final int TIME_ELLAPSED_COL = ...;
...
if (((Time) table.getModel().getValueAt(row, TIME_ELLAPSED_COL)).getMinutes() > 30) {
c.setBackground(Color.RED);
}
...

Cell Renderer for JTable - coloured rows

I've been looking around for a solution to this and I can't make head nor tail from various places of how to get my table to do coloured rows without asking my own question.
From every place I've looked I gather I need to use a cell renderer but the problem is I don't know how to apply it to my own situation.
So I have a simple JTable with 3 columns and I simply want each row to be highlighted in either green, yellow or red depending on the value of a separate variable (not displayed in the table).
It seems like it should be really simple but I can't get how to do it. If it helps my table is defined like:
studentTableModel = new DefaultTableModel(new Object[]{"Name", "StudentNo", "Part"}, 0);
jt_studentTable = new JTable(studentTableModel);
jt_studentTable.getColumnModel().getColumn(2).setPreferredWidth(10);
studentTableModel.addRow(new Object[]{"(empty)", "(empty)", "(empty)"});
JScrollPane jsp_tableScroller = new JScrollPane(jt_studentTable);
jsp_tableScroller.setPreferredSize(new Dimension(200,190));
middleCentrePanel.add(jsp_tableScroller);
The rows in the table change depending of the selection of a combo box.
Thanks in advance.

import java.awt.Color;
import java.awt.Component;
import java.awt.EventQueue;
import javax.swing.JFrame;
import javax.swing.JScrollPane;
import javax.swing.JTable;
import javax.swing.table.DefaultTableCellRenderer;
public class RowRendering {
private static Object[] columnName = {"Yes", "No"};
private static Object[][] data = {
{"Y", "N"},
{"N", "Y"},
{"Y", "N"}
};
public static void main(String[] args) {
Runnable r = new Runnable() {
#Override
public void run() {
JFrame frame = new JFrame();
JTable table = new JTable(data, columnName);
table.getColumnModel().getColumn(0).setCellRenderer(new CustomRenderer());
table.getColumnModel().getColumn(1).setCellRenderer(new CustomRenderer());
frame.add(new JScrollPane(table));
frame.setTitle("Rendering in JTable");
frame.pack();
frame.setVisible(true);
}
};
EventQueue.invokeLater(r);
}
}
class CustomRenderer extends DefaultTableCellRenderer
{
private static final long serialVersionUID = 6703872492730589499L;
public Component getTableCellRendererComponent(JTable table, Object value, boolean isSelected, boolean hasFocus, int row, int column)
{
Component cellComponent = super.getTableCellRendererComponent(table, value, isSelected, hasFocus, row, column);
if(row == 0){
cellComponent.setBackground(Color.YELLOW);
} else if ( row == 1){
cellComponent.setBackground(Color.GRAY);
} else {
cellComponent.setBackground(Color.CYAN);
}
return cellComponent;
}
}

I simply want each row to be highlighted in either green, yellow or red depending on the value of a separate variable (not displayed in the table).
Renderers work on data in the table. That is components can only paint themselves when they have all the information needed to do the job.
So somehow you need to add the information to the table. This might be done be adding a 4th column that is hidden. Then the table still has access to the information required.
Then maybe you can use the suggestion in Table Row Renderering.

Maybe this works for you:
class MyCellRenderer extends DefaultTableCellRenderer {
String separatedVariable;
public MyCellRenderer(String separatedVariable) {
this.separatedVariable = separatedVariable;
}
#Override
public Component getTableCellRendererComponent(JTable table, Object value, boolean isSelected, boolean hasFocus, int row, int col) {
Component c = super.getTableCellRendererComponent(table, value, isSelected, hasFocus, row, col);
c.setBackground(Color.WHITE);
c.setForeground(Color.BLACK);
JLabel l = (JLabel) super.getTableCellRendererComponent(table, value, isSelected, hasFocus, row, col);
if (separatedVariable.equals("YOUR VALUE TO GREEN")) {
l.setBackground(Color.GREEN);
return l;
} else {
if (separatedValue.equals("YOUR VALUE TO YELLOW")) {
l.setBackground(Color.YELLOW);
return l;
} else if (separatedValue.equals("YOUR VALUE TO RED")) {
l.setBaground(Color.RED);
return l;
}
}
return c;
}
}

I just had this same question, but a bit more complicated, since I already had several different renderers for each column, depending on the datatype.
But I found that this works like a charm:
public class MyTable extends JTable {
#Override
public Component prepareRenderer(TableCellRenderer renderer, int row, int column) {
Component result = super.prepareRenderer(renderer, row, column);
if (mustBeYellow(row, column)) {
result.setBackground(Color.yellow);
}
return result;
}
private boolean mustBeYellow(int row, int column) {
// implement this depending on your data..
return false;
}
}

How to use Renderer for TableHeader

Even I read and test answers by #kleopatra
How do I correctly use customer renderers to paint specific cells in a JTable?
particular one table header color java swing
about super.getTableCellRendererComponent(...) must be last code line before returns, I'm not able to write correct Renderer by those suggestion, for me works only this way
JLabel is added for Borders, HorizontalAlignment and Foreground, especially Background caused me a few non_senses by using Component instead of JLabel, (not important here somehow)
from SSCCE
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import javax.swing.table.*;
public class SelectedTableHeader {
private JFrame frame = new JFrame("Table Demo");
private JTableHeader header;
private Object selectedColumn = null;
private String[] columnNames = {"String", "Integer", "Float", "Double", "Locale & Double", "Boolean"};
private Object[][] data = {
{"aaa", new Integer(12), new Float(12.15), new Double(100.05), new Double(12.05), true},
{"bbb", new Integer(5), new Float(7.154), new Double(6.1555), new Double(417.55), false},
{"CCC", new Integer(92), new Float(0.1135), new Double(3.1455), new Double(11.05), true},
{"ddd", new Integer(12), new Float(31.15), new Double(10.05), new Double(23.05), true},
{"eee", new Integer(5), new Float(5.154), new Double(16.1555), new Double(17.55), false},
{"fff", new Integer(92), new Float(4.1135), new Double(31.1455), new Double(3.05), true}};
private TableModel model = new DefaultTableModel(data, columnNames) {
private static final long serialVersionUID = 1L;
#Override
public Class<?> getColumnClass(int column) {
return getValueAt(0, column).getClass();
}
};
private JTable table = new JTable(model);
public SelectedTableHeader() {
header = table.getTableHeader();
header.addMouseListener(new MouseAdapter() {
#Override
public void mouseClicked(MouseEvent e) {
JTableHeader h = (JTableHeader) e.getSource();
int i = h.columnAtPoint(e.getPoint());
Object o = h.getColumnModel().getColumn(i).getHeaderValue();
if (i < 0) {
selectedColumn = null;
return;
}
selectedColumn = o;
h.requestFocusInWindow();
}
});
final TableCellRenderer hr = table.getTableHeader().getDefaultRenderer();
header.setDefaultRenderer(new TableCellRenderer() {
private JLabel lbl;
#Override
public Component getTableCellRendererComponent(
JTable table, Object value, boolean isSelected, boolean hasFocus, int row, int column) {
if (selectedColumn == value) {
lbl = (JLabel) hr.getTableCellRendererComponent(table, value, true, true, row, column);
lbl.setBorder(BorderFactory.createCompoundBorder(lbl.getBorder(), BorderFactory.createLineBorder(Color.red, 1)));
lbl.setHorizontalAlignment(SwingConstants.LEFT);
} else {
lbl = (JLabel) hr.getTableCellRendererComponent(table, value, false, false, row, column);
lbl.setBorder(BorderFactory.createCompoundBorder(lbl.getBorder(), BorderFactory.createEmptyBorder(0, 5, 0, 0)));
lbl.setHorizontalAlignment(SwingConstants.CENTER);
}
if (column == 0) {
lbl.setForeground(Color.red);
} else {
lbl.setForeground(header.getForeground());
}
/*return (value == selectedColumn) ? hr.getTableCellRendererComponent(
table, value, true, true, row, column) : hr.getTableCellRendererComponent(
table, value, false, false, row, column);*/
return lbl;
}
});
table.setRowHeight(20);
table.setPreferredScrollableViewportSize(table.getPreferredSize());
JScrollPane scroll = new JScrollPane(table);
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.add(scroll);
frame.pack();
frame.setLocation(150, 150);
frame.setVisible(true);
}
public static void main(String[] args) {
EventQueue.invokeLater(new Runnable() {
#Override
public void run() {
SelectedTableHeader selectedTableHeader = new SelectedTableHeader();
}
});
}
}

In my experience, it's better to get the DefaultTableCellHeaderRenderer when you overwrite any JTable Renderer. So, instead of messing with the JLabel from the Renderer directly, you grab the Renderer with super(). So, your code should look like this:
header.setDefaultRenderer(new DefaultTableCellHeaderRenderer() {
#Override
public Component getTableCellRendererComponent(
JTable table, Object value, boolean isSelected, boolean hasFocus, int row, int column) {
DefaultTableCellHeaderRenderer rendererComponent = (DefaultTableCellHeaderRenderer)super.getTableCellRendererComponent(table, value, isSelected, hasFocus, row, column);
if (selectedColumn == value) {
rendererComponent.setBorder(BorderFactory.createCompoundBorder(rendererComponent.getBorder(), BorderFactory.createLineBorder(Color.red, 1)));
rendererComponent.setHorizontalAlignment(SwingConstants.LEFT);
} else {
rendererComponent.setBorder(BorderFactory.createCompoundBorder(rendererComponent.getBorder(), BorderFactory.createEmptyBorder(0, 5, 0, 0)));
rendererComponent.setHorizontalAlignment(SwingConstants.CENTER);
}
if (column == 0) {
rendererComponent.setForeground(Color.red);
} else {
rendererComponent.setForeground(header.getForeground());
}
return rendererComponent;
}
});
To try and answer your questions directly:
Question 1:
Q: How do I correctly use customer renderers to paint specific cells in a JTable?
A: Your current code is setting a Renderer on the JTableHeader. To add a Renderer on your table cells would be similar code to what's above, only you'd set it through the Column model:
table.getColumnModel().getColumn(0).setCellRenderer(new DefaultTableCellRenderer() {
#Override
public Component getTableCellRendererComponent(JTable table, Object value, boolean isSelected, boolean hasFocus, int row, int column) {
DefaultTableCellRenderer renderer = (DefaultTableCellRenderer)super.getTableCellRendererComponent(table, value, isSelected, hasFocus, row, column);
// Set your code to render your component.
return renderer;
}
});
Note about this: JTables are column-based, which means that all the data in a certain column must be the same type (your SSCCE follows this convention). My favorite thing to do is to provide a custom Renderer for each type. For example, whenever I have a Date column, I use this renderer:
import java.awt.Component;
import javax.swing.JTable;
import javax.swing.table.DefaultTableCellRenderer;
import org.joda.time.LocalDate;
/**
*
* #author Ryan
*/
public class DateCellRenderer extends DefaultTableCellRenderer {
String pattern;
public DateCellRenderer(String pattern){
this.pattern = pattern;
}
#Override
public Component getTableCellRendererComponent(JTable table, Object value, boolean isSelected, boolean hasFocus, int row, int column) {
DefaultTableCellRenderer renderer = (DefaultTableCellRenderer)super.getTableCellRendererComponent(table, value, isSelected, hasFocus, row, column);
if (value != null && value instanceof LocalDate) {
renderer.setText(((LocalDate)value).toString(pattern));
} else
throw new IllegalArgumentException("Only supported Object type is LocalDate.");
return renderer;
}
}
And I call this code with something similar:
table.getColumn("Date Entered").setCellRenderer(new DateCellRenderer("MMM dd, yyyy"));
Question 2:
Q: particular one table header color java swing
A: Umm.. Your SSCCE seems to have it figured out.
Question 3:
Q: about super.getTableCellRendererComponent(...) must be last code line before returns, I'm not able to write correct Renderer by those suggestion, for me works only this way
A: I'm not sure what you mean "must be last code line before returns." That is not the case, proven by the code snip I gave above
Question 4:
Q: JLabel is added for Borders, HorizontalAlignment and Foreground, especially Background caused me a few non_senses by using Component instead of JLabel, (not important here somehow)
A: Ok... the DefaultTableCellHeaderRenderer is sufficient for all of those, borders, alignment, foreground and background.

I had this happen to me in the past and I was convinced it had to do with the Cell Renderer, but the ArraysXxxException kind of Exceptions hunted me because I had forgotten to unselect and stop editing the cell before adding/removing rows. You should try clearSelection() and table.getCellEditor().stopCellEditing(); on your JTable before remove/add and see if that solves your problem.
First, of course, make sure it is editing:
if (table.isEditing()) {
table.getCellEditor().stopCellEditing();
}