JTable: After one row is modified, the row should have red color background

Question

After one row is modified(using setValueAt()),
I want the modified row to have red color background color.
How can I do that? I tried.
JTableInstance.setBackground( Color.RED);But it sets all the rows not the only modified row.

Answer 1

import java.awt.*;
import java.util.ArrayList;
import javax.swing.*;
import javax.swing.table.*;
public class TableChangeTest extends JFrame {
    public TableChangeTest() {
        initComponents();
        renderer = new MyTableRenderer();
        table.setDefaultRenderer(String.class, renderer);
        int row = 0;
        table.setValueAt("test1",row,0);
        rowsChanged.add( row );
        row = 2;
        table.setValueAt("test2",row,1);
        rowsChanged.add( row );
    private void initComponents() {
        panel = new JPanel();
        scrollPane = new JScrollPane();
        table = new JTable();
        setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
        setTitle("Table Change");
        panel.setLayout(new BorderLayout());
        table.setModel(new DefaultTableModel(
                new Object [][] {
                    {"1", "a"},
                    {"2", "b"},
                    {"3", "c"},
                    {"4", "d"}
                new String [] {
            "Title 1", "Title 2"
            Class[] types = new Class [] {
                java.lang.String.class, java.lang.String.class
            public Class getColumnClass(int columnIndex) {
                return types [columnIndex];
        scrollPane.setViewportView(table);
        panel.add(scrollPane, BorderLayout.CENTER);
        getContentPane().add(panel, BorderLayout.CENTER);
        Dimension screenSize = Toolkit.getDefaultToolkit().getScreenSize();
        setBounds((screenSize.width-357)/2, (screenSize.height-241)/2, 357, 241);
    public static void main(String args[]) {
        new TableChangeTest().setVisible(true);
    private JPanel panel;
    private JScrollPane scrollPane;
    private JTable table;
    private TableCellRenderer renderer;
    private ArrayList rowsChanged = new ArrayList();
    class MyTableRenderer 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);
            setBackground( Color.white );
            if( rowsChanged.contains(row) ) {
                setBackground( Color.red );
            return this;
}