JTable hide and show columns

Question

I want to add some columns to a table (Swing JTable). Some of them will have a default size (e.g. 250), others will be hidden (so their size will be 0). I use this code:

Answer 1

public class TableColumnHider {

    private final JTable table;
    private final TableColumnModel tcm;
    private final Map hiddenColumns;

    public TableColumnHider(JTable table) {
        this.table = table;
        tcm = table.getColumnModel();
        hiddenColumns = new HashMap();
    }

    public void hide(String columnName, String keySig) {
        int index = tcm.getColumnIndex(columnName);
        TableColumn column = tcm.getColumn(index);
        hiddenColumns.put(columnName, column);
        hiddenColumns.put(keySig + columnName, new Integer(index));
        tcm.removeColumn(column);
    }

    public void show(String columnName, String keySig) {
        Object o = hiddenColumns.remove(columnName);
        if (o == null) {
            return;
        }
        tcm.addColumn((TableColumn) o);
        o = hiddenColumns.remove(keySig + columnName);
        if (o == null) {
            return;
        }
        int column = ((Integer) o).intValue();
        int lastColumn = tcm.getColumnCount() - 1;
        if (column < lastColumn) {
            tcm.moveColumn(lastColumn, column);
        }
    }
}