Using a JComboBox in a Cell in a JTable Component
If the possible values allowed in a column must be one from a small
fixed set of values, a combobox might be appropriate as the cell
editor for that column. By using a combobox, it is impossible for the
user to input an invalid value.
JTable table = new JTable();
DefaultTableModel model = (DefaultTableModel)table.getModel();
// Add some columns
model.addColumn("A", new Object[]{"item1"});
model.addColumn("B", new Object[]{"item2"});
// These are the combobox values
String[] values = new String[]{"item1", "item2", "item3"};
// Set the combobox editor on the 1st visible column
int vColIndex = 0;
TableColumn col = table.getColumnModel().getColumn(vColIndex);
col.setCellEditor(new MyComboBoxEditor(values));
// If the cell should appear like a combobox in its
// non-editing state, also set the combobox renderer
col.setCellRenderer(new MyComboBoxRenderer(values));
public class MyComboBoxRenderer extends JComboBox implements TableCellRenderer {
public MyComboBoxRenderer(String[] items) {
super(items);
}
public Component getTableCellRendererComponent(JTable table, Object value,
boolean isSelected, boolean hasFocus, int row, int column) {
if (isSelected) {
setForeground(table.getSelectionForeground());
super.setBackground(table.getSelectionBackground());
} else {
setForeground(table.getForeground());
setBackground(table.getBackground());
}
// Select the current value
setSelectedItem(value);
return this;
}
}
public class MyComboBoxEditor extends DefaultCellEditor {
public MyComboBoxEditor(String[] items) {
super(new JComboBox(items));
}
}
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