JTable Cells with different Color according to value

Pls help I want to be able to display all rows (students) that paid more than 20 naira in Green
else display rows (student) that paid < 20 naira in red
But at the moment it is displaying everything in green why?
tmp is the variable
Code would help pls!
class TestRenderer extends DefaultTableCellRenderer
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 > 0)
for (int i =0; i < table.getRowCount(); i++)
String tmpString = (String) table.getValueAt(i,3);
if (tmpString != null)
double tmp = Double.parseDouble(tmpString);
if (tmp > 20)
System.out.println("Variable is "+tmp);
setBackground( Color.green );
else
setBackground( Color.red );
return this;

Get rid of that loop
String tmpString = (String) table.getValueAt(row,3);

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Waiting for reply....
Code snooker

Hmm, why are you doing the curColor instanceof? What does this accomplish? I don't see any reason to ask what it was before; all you should be interested in here is what you want it to be now.
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this.setForeground(model.getColor(row));I also don't see why you're doing the update() -- JTable is going to do that for you at the appropriate time, you have no idea if now is the right time to do it or not. In fact it probably isn't, you're probably updating the previously-drawn cell with your new color and alignment, which may be the strange behavior you're seeing.
Also, I don't see why you're doing the super. All that's going to do is return "this", so why not just use "this"?
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