Writing own TableCellRenderer for setting the Background Color of a cell ?

Question

Hello,
I am using the JTable and DefaultTableModel for my GUI. I use also only plain text in the rows and columns. I have a method which examine every row wether something is wrong with a string so if something is wrong i want to set the BackgroundColor of this cell with the bad string to a color i can define.
Do I need to write an own TableCellRenderer for this tiny task?
Table class has no setBackground(new Color(22,22,22),posRow,posCol);

Answer 1

http://forum.java.sun.com/thread.jspa?forumID=57&threa
dID=606504this code is from your ColorRenderer class:
public void actionPerformed(ActionEvent e)
               Iterator it = colors.keySet().iterator();
               while ( it.hasNext() )
                    Point key = (Point)it.next();
                    int row = key.x;
                    int column = key.y;
                    if (column == -1)
                         model.fireTableRowsUpdated(row, row);
                    else if (row == -1)
                         int rows = table.getRowCount();
                         for (int i = 0; i < rows; i++)
                              model.fireTableCellUpdated(i, column);                              
          }you have set an ActionListener to the ColorRenderer class and put the actionPerformed method in it but compared to a JButton the actionPerformed method is called when i click the JButton but what you do in your code that the actionPerformed method is executed. I have deleted the whole actionPerformed method and the listener and still the cell is displayed with a color so was it for the blinking?
And the method setBackground is nowhere called or run actively so is this method called internally by the ColorRenderer class? or is this method somehow called recursively as in the method setBackground I can see this method call:
c.setBackground( (Color)o ); but i think this is another setBackground method right? because the first method i mentioned has 3 parameters not 1 parameter so where is the method setBackground with 3 parameters called actively in your code? i cant find anything. ok after examining again the c.setBackground( (Color)o ); is the one with 3 parameters ;-)
public void setBackground(Component c, int row, int column)
          { that was set for the previous cell, so reset it here
               if (c instanceof DefaultTableCellRenderer)
                    c.setBackground( table.getBackground() );
               //  In case columns have been reordered, convert the column number
               column = table.convertColumnIndexToModel(column);
               //  Get cell color
               Object key = getKey(row, column);
               Object o = colors.get( key );
               if (o != null)
                    c.setBackground( (Color)o );
                    return;
               //  Get row color
               key = getKey(row, -1);
               o = colors.get( key );
               if (o != null)
                    c.setBackground( (Color)o );
                    return;
               //  Get column color
               key = getKey(-1, column);
               o = colors.get( key );
               if (o != null)
                    c.setBackground( (Color)o );
                    return;
          }using your full code gives me a bug:
when i double click in the first column to change some text doesnt matter which row then the selected cell gets a red border and the rest of the table freezes. When i exchange the order of the columns move column 1 to 2 and column 2 to 1 then the freezed table is working again?? could you help solving that problem else the cell color setting works fine for me :-) thank you very much!