import javax.swing.JComponent;
import javax.swing.JFrame;
import javax.swing.JTable;
import javax.swing.LookAndFeel;
import javax.swing.table.AbstractTableModel;
public class RowNumberHeader extends JTable {
protected JTable mainTable;
public RowNumberHeader(JTable table) {
super();
mainTable = table;
setModel(new RowNumberTableModel());
setPreferredScrollableViewportSize(getMinimumSize());
setRowSelectionAllowed(false);
JComponent renderer = (JComponent) getDefaultRenderer(Object.class);
LookAndFeel.installColorsAndFont(renderer, "TableHeader.background",
"TableHeader.foreground", "TableHeader.font");
LookAndFeel.installBorder(this, "TableHeader.cellBorder");
}
public int getRowHeight(int row) {
return mainTable.getRowHeight();
}
class RowNumberTableModel extends AbstractTableModel {
public int getRowCount() {
return mainTable.getModel().getRowCount();
}
public int getColumnCount() {
return 1;
}
public Object getValueAt(int row, int column) {
return new Integer(row + 1);
}
}
public static void main(String[] a) {
JFrame f = new JFrame();
f.add(new RowNumberHeader(new JTable(3, 4)));
f.setSize(300, 300);
f.setVisible(true);
}
}