Change particular cell color when finised editing and when lost focus

Question

Hi, i want to create a table which its particular cell can change its color automatically to red if the value in cell in column in two is smaller than column cell value in column 1 when user finish typed a value or if the cell has lost focus. I've wrote a code for the renderer but how should I use action, KeyListener or MouseLister or both
* File ColouredCellRenderer.java
import java.awt.Color;
import java.awt.Component;
import javax.swing.JTable;
import javax.swing.table.TableCellRenderer;
import javax.swing.table.DefaultTableCellRenderer;
public class ColouredCellRenderer extends DefaultTableCellRenderer implements TableCellRenderer{
    private Object col1Value, col2Value;
    public ColouredCellRenderer(Object args1, Object args2){
        this.col1Value = args1;
        this.col2Value = args2;
    public Component getTableCellRendererComponent(JTable table, Object value, boolean isSelected, boolean hasFocus, int row, int column) {
          return super.getTableCellRendererComponent(table, value, isSelected, hasFocus, row, column);
     protected void setValue(Object v){
          super.setValue(v);
        if((col1Value != null) & (col2Value != null)){
            int x = Integer.parseInt(col1Value.toString());
            int y = Integer.parseInt(col2Value.toString());
            if(x > y){
                this.setBackground(Color.RED);
            else{
                this.setBackground(Color.GREEN);
}

Answer 1

All you should need is the cell renderer to achieve that effect. Whenever the table needs to render a cell it will call the method
getTableCellRendererComponent(...);This method in turn returns a component showing what the cell should look like. The DefaultTableCellRenderer extends JLabel, so you are meant to customize the label (based on parameters that were passed) and return this* at the end of the method.
public Component getTableCellRendererComponent(...) {
         return this;
}This one label is used to render all the cells of all the columns that the cell renderer is assigned to. Since you want some cells too be red, you should call setBackground(Color.red)+ when the conditions are appropriate or null otherwise.