Using an empty column as a divider in a JTable.
- by Catalina Island
I'm trying to use an empty column as a divider between pairs of columns in a JTable. Here's a picture and code for what I have so far. I know I can change the look using a custom TableCellRenderer. Before I go down that road, is there a better way to do this? Any ideas appreciated.
import javax.swing.*;
import javax.swing.table.*;
public class TablePanel extends JPanel {
public static void main(String[] args) {
SwingUtilities.invokeLater(new Runnable() {
@Override
public void run() {
JFrame f = new JFrame("TablePanel");
f.setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE);
f.add(new TablePanel());
f.pack();
f.setVisible(true);
}
});
}
public TablePanel() {
TableModel dataModel = new MyModel();
JTable table = new JTable(dataModel);
table.getColumnModel().getColumn(MyModel.DIVIDER).setMaxWidth(0);
JScrollPane jsp = new JScrollPane(table);
jsp.setVerticalScrollBarPolicy(JScrollPane.VERTICAL_SCROLLBAR_ALWAYS);
this.add(jsp);
}
private static class MyModel extends AbstractTableModel {
private static final int DIVIDER = 2;
private final String[] names = { "A1", "A2", "", "B1", "B2" };
@Override
public int getRowCount() {
return 32;
}
@Override
public int getColumnCount() {
return names.length;
}
@Override
public String getColumnName(int col) {
if (col == DIVIDER) return "";
return names[col];
}
@Override
public Object getValueAt(int row, int col) {
if (col == DIVIDER) return "";
return (row + 1) / 10.0;
}
@Override
public Class<?> getColumnClass(int col) {
if (col == DIVIDER) return String.class;
return Number.class;
}
}
}
