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

    HashMap hashMap_columns = new HashMap();

    DefaultTableColumnModel defaultTableColumnModel = (DefaultTableColumnModel)jtable.getColumnModel();

    Enumeration enumeration = defaultTableColumnModel.getColumns();

    while (enumeration.hasMoreElements())
    {
           TableColumn tableColumn = enumeration.nextElement();

           hashMap_columns.put((String)tableColumn.getIdentifier(),tableColumn);

    }


    public void setColumnVisible(String identifier, boolean setVisible)
    {
            TableColumn tableColumn = hashMap_columns.get(identifier);

            if (setVisible)
            {
                // using a sorted map removes the need to check column index/position
                SortedMap sortedMap = new TreeMap();

                // retreive all visible columns 
                Enumeration enumeration = defaultTableColumnModel.getColumns();

                while (enumeration.hasMoreElements())
                {
                    TableColumn column = enumeration.nextElement();

                    sortedMap.put(column.getModelIndex(),column);
                }

                // add the column of interest to the sorted map
                sortedMap.put(tableColumn.getModelIndex(),tableColumn);

                // remove all visible columns
                for (TableColumn column: sortedMap.values())
                {
                    defaultTableColumnModel.removeColumn(column);
                }

                // add all previously visible columns as well as the column of interest
                for (TableColumn column: sortedMap.values())
                {
                    defaultTableColumnModel.addColumn(column);
                }
            }
            else
            {
                defaultTableColumnModel.removeColumn(tableColumn);
            }
        }