import java.awt.BorderLayout;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JScrollPane;
import javax.swing.JTable;
import javax.swing.table.DefaultTableCellRenderer;
import javax.swing.table.TableCellRenderer;
import javax.swing.table.TableColumn;
import javax.swing.table.TableColumnModel;
public class MainClass {
public static void main(String args[]) {
String rows[][] = { { "A", "a" }, { "B", "b" }, { "E", "e" } };
String headers[] = { "Upper", "Lower" };
JFrame frame = new JFrame("Tooltip Sample");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
JTable table = new JTable(rows, headers);
JLabel headerRenderer = new DefaultTableCellRenderer();
String columnName = table.getModel().getColumnName(0);
headerRenderer.setText(columnName);
headerRenderer.setToolTipText("Wave");
TableColumnModel columnModel = table.getColumnModel();
TableColumn column = columnModel.getColumn(0);
column.setHeaderRenderer((TableCellRenderer) headerRenderer);
JScrollPane scrollPane = new JScrollPane(table);
frame.add(scrollPane, BorderLayout.CENTER);
frame.setSize(300, 150);
frame.setVisible(true);
}
}