JTable column headings - how to change after instantiation

Question

Is there a way to change the column headings on a JTable AFTER is has already been instantiated? I reviewed the JTable, TableModel and TableColumn API's in detail. The only method I found related to this is the 'getColumnName' in TableModel. But there is no associated 'setColumnName'.

Answer 1

Hi!
You can use the method setHeaderValue(Object) of TableColumn. I wrote a small example:
import javax.swing.*;
import javax.swing.table.*;
public class TableExample {
    public static void main(String[] args) {
        JFrame frame = new JFrame();
        Object[][] data = {
            { "a1", "a2", "a3" },
            { "b1", "b2", "b3" },
            { "c1", "c2", "c3" },
        Object[] headers = {
            "1", "2", "3"
        JTable table = new JTable(data, headers);
        frame.getContentPane().add(new JScrollPane(table));
        frame.pack();
        frame.setVisible(true);
        //  Change header for first column
        TableColumnModel columnModel = table.getColumnModel();
        TableColumn col0 = columnModel.getColumn(0);
        col0.setHeaderValue("New header value");
}Søren